Basic String Handling Functions

本文详细介绍了C语言中标准字符串处理函数的使用方法,包括复制、比较、连接等基本操作及字符串搜索功能。此外还概述了内存操作函数,如内存复制、移动、设置等。

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All the string handling functions are prototyped in:

#include <string.h>

The common functions are described below:

char *stpcpy (const char *dest,const char *src) -- Copy one string into another.
int strcmp(const char *string1,const char *string2) - Compare string1 and string2 to determine alphabetic order.
char *strcpy(const char *string1,const char *string2) -- Copy string2 to stringl.
char *strerror(int errnum) -- Get error message corresponding to specified error number.
int strlen(const char *string) -- Determine the length of a string.
char *strncat(const char *string1, char *string2, size_t n) -- Append n characters from string2 to stringl.
int strncmp(const char *string1, char *string2, size_t n) -- Compare first n characters of two strings.
char *strncpy(const char *string1,const char *string2, size_t n) -- Copy first n characters of string2 to stringl .
int strcasecmp(const char *s1, const char *s2) -- case insensitive version of strcmp().
int strncasecmp(const char *s1, const char *s2, int n) -- case insensitive version of strncmp().

The use of most of the functions is straightforward, for example:

 

char *str1 = "HELLO";
char *str2;
int length;

length = strlen("HELLO"); /* length = 5 */
(void) strcpy(str2,str1);

Note that both strcat() and strcopy() both return a copy of their first argument which is the destination array. Note the order of the arguments is destination array followed by source array which is sometimes easy to get the wrong around when programming.

The strcmp() function lexically compares the two input strings and returns:

 

Less than zero
-- if string1 is lexically less than string2
Zero
-- if string1 and string2 are lexically equal
Greater than zero
-- if string1 is lexically greater than string2

This can also confuse beginners and experience programmers forget this too.

The strncat(), strncmp,() and strncpy() copy functions are string restricted version of their more general counterparts. They perform a similar task but only up to the first n characters. Note the the NULL terminated requirement may get violated when using these functions, for example:

 

char *str1 = "HELLO";
char *str2;
int length = 2;


(void) strcpy(str2,str1, length); /* str2 = "HE" */

str2 is NOT NULL TERMINATED!! -- BEWARE

 

String Searching

The library also provides several string searching functions:

char *strchr(const char *string, int c) -- Find first occurrence of character c in string.
char *strrchr(const char *string, int c) -- Find last occurrence of character c in string.
char *strstr(const char *s1, const char *s2) -- locates the first occurrence of the string s2 in string s1.
char *strpbrk(const char *s1, const char *s2) -- returns a pointer to the first occurrence in string s1 of any character from string s2, or a null pointer if no character from s2 exists in s1
size_t strspn(const char *s1, const char *s2) -- returns the number of characters at the begining of s1 that match s2.
size_t strcspn(const char *s1, const char *s2) -- returns the number of characters at the begining of s1 that do not match s2.
char *strtok(char *s1, const char *s2) -- break the string pointed to by s1 into a sequence of tokens, each of which is delimited by one or more characters from the string pointed to by s2.
char *strtok_r(char *s1, const char *s2, char **lasts) -- has the same functionality as strtok() except that a pointer to a string placeholder lasts must be supplied by the caller.

strchr() and strrchr() are the simplest to use, for example:

 

char *str1 = "Hello";
char *ans;

ans = strchr(str1,'l');

After this execution, ans points to the location str1 + 2

strpbrk() is a more general function that searches for the first occurrence of any of a group of characters, for example:

 

char *str1 = "Hello";
char *ans;

ans = strpbrk(str1,'aeiou');

Here, ans points to the location str1 + 1, the location of the first e.

strstr() returns a pointer to the specified search string or a null pointer if the string is not found. If s2 points to a string with zero length (that is, the string ""), the function returns s1. For example,

 

char *str1 = "Hello";
char *ans;

ans = strstr(str1,'lo');

will yield ans = str + 3.

strtok() is a little more complicated in operation. If the first argument is not NULL then the function finds the position of any of the second argument characters. However, the position is remembered and any subsequent calls to strtok() will start from this position if on these subsequent calls the first argument is NULL. For example, If we wish to break up the string str1 at each space and print each token on a new line we could do:

 

char *str1 = "Hello Big Boy";
char *t1;


for ( t1 = strtok(str1," ");
      t1 != NULL;
      t1 = strtok(NULL, " ") )

printf("%s/n",t1);

Here we use the for loop in a non-standard counting fashion:

 

  • The initialisation calls strtok() loads the function with the string str1
  • We terminate when t1 is NULL
  • We keep assigning tokens of str1 to t1 until termination by calling strtok() with a NULL first argument.

    Memory Operations: <memory.h>

    Finally we briefly overview some basic memory operations. Although not strictly string functions the functions are prototyped in #include <string.h>:

    void *memchr (void *s, int c, size_t n) -- Search for a character in a buffer .
    int memcmp (void *s1, void *s2, size_t n) -- Compare two buffers.
    void *memcpy (void *dest, void *src, size_t n) -- Copy one buffer into another .
    void *memmove (void *dest, void *src, size_t n) -- Move a number of bytes from one buffer lo another.
    void *memset (void *s, int c, size_t n) -- Set all bytes of a buffer to a given character.

    Their use is fairly straightforward and not dissimilar to comparable string operations (except the exact length (n) of the operations must be specified as there is no natural termination here).

    Note that in all case to bytes of memory are copied. The sizeof() function comes in handy again here, for example:

     

    char src[SIZE],dest[SIZE];
    int  isrc[SIZE],idest[SIZE];
    
    memcpy(dest,src, SIZE); /* Copy chars (bytes) ok */
    
    memcpy(idest,isrc, SIZE*sizeof(int)); /* Copy arrays of ints */
    

    memmove() behaves in exactly the same way as memcpy() except that the source and destination locations may overlap.

    memcmp() is similar to strcmp() except here unsigned bytes are compared and returns less than zero if s1 is less than s2 etc.

 

 

 

 

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//============================================================================== // WARNING!! This file is overwritten by the Block UI Styler while generating // the automation code. Any modifications to this file will be lost after // generating the code again. // // Filename: D:\NXopen\BaiduSyncdisk\studio\hkjm\ui\hkjm.cpp // // This file was generated by the NX Block UI Styler // Created by: MiCH-CEO // Version: NX 12 // Date: 08-06-2025 (Format: mm-dd-yyyy) // Time: 19:18 (Format: hh-mm) // //============================================================================== //============================================================================== // Purpose: This TEMPLATE file contains C++ source to guide you in the // construction of your Block application dialog. The generation of your // dialog file (.dlx extension) is the first step towards dialog construction // within NX. You must now create a NX Open application that // utilizes this file (.dlx). // // The information in this file provides you with the following: // // 1. Help on how to load and display your Block UI Styler dialog in NX // using APIs provided in NXOpen.BlockStyler namespace // 2. The empty callback methods (stubs) associated with your dialog items // have also been placed in this file. These empty methods have been // created simply to start you along with your coding requirements. // The method name, argument list and possible return values have already // been provided for you. //============================================================================== //------------------------------------------------------------------------------ //These includes are needed for the following template code //------------------------------------------------------------------------------ #include "hkjm.hpp" using namespace NXOpen; using namespace NXOpen::BlockStyler; //------------------------------------------------------------------------------ // Initialize static variables //------------------------------------------------------------------------------ Session *(hkjm::theSession) = NULL; UI *(hkjm::theUI) = NULL; //------------------------------------------------------------------------------ // Constructor for NX Styler class //------------------------------------------------------------------------------ hkjm::hkjm() { try { // Initialize the NX Open C++ API environment hkjm::theSession = NXOpen::Session::GetSession(); hkjm::theUI = UI::GetUI(); theDlxFileName = "hkjm.dlx"; theDialog = hkjm::theUI->CreateDialog(theDlxFileName); // Registration of callback functions theDialog->AddApplyHandler(make_callback(this, &hkjm::apply_cb)); theDialog->AddOkHandler(make_callback(this, &hkjm::ok_cb)); theDialog->AddUpdateHandler(make_callback(this, &hkjm::update_cb)); theDialog->AddInitializeHandler(make_callback(this, &hkjm::initialize_cb)); theDialog->AddDialogShownHandler(make_callback(this, &hkjm::dialogShown_cb)); } catch(exception& ex) { //---- Enter your exception handling code here ----- throw; } } //------------------------------------------------------------------------------ // Destructor for NX Styler class //------------------------------------------------------------------------------ hkjm::~hkjm() { if (theDialog != NULL) { delete theDialog; theDialog = NULL; } } //------------------------------- DIALOG LAUNCHING --------------------------------- // // Before invoking this application one needs to open any part/empty part in NX // because of the behavior of the blocks. // // Make sure the dlx file is in one of the following locations: // 1.) From where NX session is launched // 2.) $UGII_USER_DIR/application // 3.) For released applications, using UGII_CUSTOM_DIRECTORY_FILE is highly // recommended. This variable is set to a full directory path to a file // containing a list of root directories for all custom applications. // e.g., UGII_CUSTOM_DIRECTORY_FILE=$UGII_BASE_DIR\ugii\menus\custom_dirs.dat // // You can create the dialog using one of the following way: // // 1. USER EXIT // // 1) Create the Shared Library -- Refer "Block UI Styler programmer's guide" // 2) Invoke the Shared Library through File->Execute->NX Open menu. // //------------------------------------------------------------------------------ extern "C" DllExport void ufusr(char *param, int *retcod, int param_len) { hkjm *thehkjm = NULL; try { UF_initialize(); //开发的许可函数,初始化 thehkjm = new hkjm(); // The following method shows the dialog immediately thehkjm->Show(); } catch(exception& ex) { //---- Enter your exception handling code here ----- hkjm::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } if(thehkjm != NULL) { delete thehkjm; thehkjm = NULL; }UF_terminate(); //释放许可函数,结束化 } //------------------------------------------------------------------------------ // This method specifies how a shared image is unloaded from memory // within NX. This method gives you the capability to unload an // internal NX Open application or user exit from NX. Specify any // one of the three constants as a return value to determine the type // of unload to perform: // // // Immediately : unload the library as soon as the automation program has completed // Explicitly : unload the library from the "Unload Shared Image" dialog // AtTermination : unload the library when the NX session terminates // // // NOTE: A program which associates NX Open applications with the menubar // MUST NOT use this option since it will UNLOAD your NX Open application image // from the menubar. //------------------------------------------------------------------------------ extern "C" DllExport int ufusr_ask_unload() { //return (int)Session::LibraryUnloadOptionExplicitly; return (int)Session::LibraryUnloadOptionImmediately; //return (int)Session::LibraryUnloadOptionAtTermination; } //------------------------------------------------------------------------------ // Following method cleanup any housekeeping chores that may be needed. // This method is automatically called by NX. //------------------------------------------------------------------------------ extern "C" DllExport void ufusr_cleanup(void) { try { //---- Enter your callback code here ----- } catch(exception& ex) { //---- Enter your exception handling code here ----- hkjm::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } } int hkjm::Show() { try { theDialog->Show(); } catch(exception& ex) { //---- Enter your exception handling code here ----- hkjm::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } return 0; } //------------------------------------------------------------------------------ //---------------------Block UI Styler Callback Functions-------------------------- //------------------------------------------------------------------------------ //------------------------------------------------------------------------------ //Callback Name: initialize_cb //------------------------------------------------------------------------------ void hkjm::initialize_cb() { try { group0 = dynamic_cast<NXOpen::BlockStyler::Group*>(theDialog->TopBlock()->FindBlock("group0")); hk2edge = dynamic_cast<NXOpen::BlockStyler::CurveCollector*>(theDialog->TopBlock()->FindBlock("hk2edge")); hk1edge = dynamic_cast<NXOpen::BlockStyler::CurveCollector*>(theDialog->TopBlock()->FindBlock("hk1edge")); hk1sd = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("hk1sd")); hk2sd = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("hk2sd")); group = dynamic_cast<NXOpen::BlockStyler::Group*>(theDialog->TopBlock()->FindBlock("group")); hkdj = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("hkdj")); hk2jd = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("hk2jd")); hk1jd = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("hk1jd")); vector0 = dynamic_cast<NXOpen::BlockStyler::SpecifyVector*>(theDialog->TopBlock()->FindBlock("vector0")); bodySelect0 = dynamic_cast<NXOpen::BlockStyler::BodyCollector*>(theDialog->TopBlock()->FindBlock("bodySelect0")); color1 = dynamic_cast<NXOpen::BlockStyler::ObjectColorPicker*>(theDialog->TopBlock()->FindBlock("color1")); color2 = dynamic_cast<NXOpen::BlockStyler::ObjectColorPicker*>(theDialog->TopBlock()->FindBlock("color2")); } catch(exception& ex) { //---- Enter your exception handling code here ----- hkjm::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } } //------------------------------------------------------------------------------ //Callback Name: dialogShown_cb //This callback is executed just before the dialog launch. Thus any value set //here will take precedence and dialog will be launched showing that value. //------------------------------------------------------------------------------ void hkjm::dialogShown_cb() { try { //---- Enter your callback code here ----- } catch(exception& ex) { //---- Enter your exception handling code here ----- hkjm::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } } //------------------------------------------------------------------------------ //Callback Name: apply_cb //------------------------------------------------------------------------------ // 应用按钮回调函数 - 读取所有控件数据 int hkjm::apply_cb() { int errorCode = 0; std::string logMsg; try { // ===== 1. 获取曲线选择器1的值 ===== std::vector<Curve*> curves1; if (hk1edge) { PropertyList* props = hk1edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves1.push_back(curve); logMsg += "曲线1: " + std::string(curve->JournalIdentifier()) + "\n"; // 示例:设置曲线颜色为186号色 UF_OBJ_set_color(obj->Tag(), 186); } } // 更新控件中的选择对象(如果需要保留修改) props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; // 必须删除属性对象 } // ===== 2. 获取曲线选择器2的值 ===== std::vector<Curve*> curves2; if (hk2edge) { PropertyList* props = hk2edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves2.push_back(curve); logMsg += "曲线2: " + std::string(curve->JournalIdentifier()) + "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // ===== 3. 获取hk1sd表达式值 ===== double hk1sdValue = 0.0; if (hk1sd) { PropertyList* props = hk1sd->GetProperties(); hk1sdValue = props->GetDouble("Value"); logMsg += "hk1sd值: " + std::to_string(hk1sdValue) + "\n"; // 示例:设置新值 // props->SetDouble("Value", hk1sdValue * 2); delete props; } // ===== 4. 获取hk2sd表达式值 ===== double hk2sdValue = 0.0; if (hk2sd) { PropertyList* props = hk2sd->GetProperties(); hk2sdValue = props->GetDouble("Value"); logMsg += "hk2sd值: " + std::to_string(hk2sdValue) + "\n"; delete props; } // ===== 5. 获取hkdj表达式值 ===== double hkdjValue = 0.0; if (hkdj) { PropertyList* props = hkdj->GetProperties(); hkdjValue = props->GetDouble("Value"); logMsg += "hkdj值: " + std::to_string(hkdjValue) + "\n"; delete props; } // ===== 6. 获取hk1jd表达式值 ===== double hk1jdValue = 0.0; if (hk1jd) { PropertyList* props = hk1jd->GetProperties(); hk1jdValue = props->GetDouble("Value"); logMsg += "hk1jd值: " + std::to_string(hk1jdValue) + "\n"; delete props; } // ===== 7. 获取hk2jd表达式值 ===== double hk2jdValue = 0.0; if (hk2jd) { PropertyList* props = hk2jd->GetProperties(); hk2jdValue = props->GetDouble("Value"); logMsg += "hk2jd值: " + std::to_string(hk2jdValue) + "\n"; delete props; } // ===== 8. 获取矢量方向 ===== Vector3d directionVector(0.0, 0.0, 1.0); // 默认Z方向 if (vector0) { PropertyList* props = vector0->GetProperties(); directionVector = props->GetVector("Vector"); logMsg += "矢量方向: (" + std::to_string(directionVector.X) + ", " + std::to_string(directionVector.Y) + ", " + std::to_string(directionVector.Z) + ")\n"; delete props; } // ===== 9. 获取选中的实体 ===== std::vector<Body*> bodies; if (bodySelect0) { PropertyList* props = bodySelect0->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Body* body = dynamic_cast<Body*>(obj)) { bodies.push_back(body); logMsg += "实体: " + std::string(body->JournalIdentifier()) + "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // ===== 10. 获取颜色选择器1的颜色 ===== int colorIndex1 = 0; // 默认黑色 if (color1) { PropertyList* colorProps = color1->GetProperties(); std::vector<int> colors = colorProps->GetIntegerVector("Value"); if (!colors.empty()) { colorIndex1 = colors[0]; logMsg += "颜色1索引: " + std::to_string(colorIndex1) + "\n"; // 示例:设置新颜色 // std::vector<int> newColors = {186}; // colorProps->SetIntegerVector("Value", newColors); } delete colorProps; } // ===== 11. 获取颜色选择器2的颜色 ===== int colorIndex2 = 0; // 默认黑色 if (color2) { PropertyList* colorProps = color2->GetProperties(); std::vector<int> colors = colorProps->GetIntegerVector("Value"); if (!colors.empty()) { colorIndex2 = colors[0]; logMsg += "颜色2索引: " + std::to_string(colorIndex2) + "\n"; } delete colorProps; } // ===== 输出所有获取的值 ===== theUI->NXMessageBox()->Show("控件值获取结果", NXMessageBox::DialogTypeInformation, logMsg.c_str()); } catch (std::exception& ex) { errorCode = 1; std::string errorMsg = "获取控件值错误: "; errorMsg += ex.what(); theUI->NXMessageBox()->Show("错误", NXMessageBox::DialogTypeError, errorMsg.c_str()); } catch (...) { errorCode = 1; theUI->NXMessageBox()->Show("错误", NXMessageBox::DialogTypeError, "未知获取控件值错误"); } return errorCode; } //------------------------------------------------------------------------------ //Callback Name: update_cb //------------------------------------------------------------------------------ int hkjm::update_cb(NXOpen::BlockStyler::UIBlock* block) { try { if(block == hk2edge) { //---------Enter your code here----------- } else if(block == hk1edge) { //---------Enter your code here----------- } else if(block == hk1sd) { //---------Enter your code here----------- } else if(block == hk2sd) { //---------Enter your code here----------- } else if(block == hkdj) { //---------Enter your code here----------- } else if(block == hk2jd) { //---------Enter your code here----------- } else if(block == hk1jd) { //---------Enter your code here----------- } else if(block == vector0) { //---------Enter your code here----------- } else if(block == bodySelect0) { //---------Enter your code here----------- } else if(block == color1) { //---------Enter your code here----------- } else if(block == color2) { //---------Enter your code here----------- } } catch(exception& ex) { //---- Enter your exception handling code here ----- hkjm::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } return 0; } //------------------------------------------------------------------------------ //Callback Name: ok_cb //------------------------------------------------------------------------------ int hkjm::ok_cb() { int errorCode = 0; try { errorCode = apply_cb(); } catch(exception& ex) { //---- Enter your exception handling code here ----- errorCode = 1; hkjm::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } return errorCode; } //------------------------------------------------------------------------------ //Function Name: GetBlockProperties //Description: Returns the propertylist of the specified BlockID //------------------------------------------------------------------------------ PropertyList* hkjm::GetBlockProperties(const char *blockID) { return theDialog->GetBlockProperties(blockID); }错误提示:严重性 代码 说明 项目 文件 行 禁止显示状态 错误(活动) E0289 没有与参数列表匹配的构造函数 "std::basic_string<_Elem, _Traits, _Alloc>::basic_string [其中 _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char>]" 实例 hkjm D:\NXopen\BaiduSyncdisk\studio\hkjm\hkjm.cpp 251 错误(活动) E0289 没有与参数列表匹配的构造函数 "std::basic_string<_Elem, _Traits, _Alloc>::basic_string [其中 _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char>]" 实例 hkjm D:\NXopen\BaiduSyncdisk\studio\hkjm\hkjm.cpp 271 错误(活动) E0289 没有与参数列表匹配的构造函数 "std::basic_string<_Elem, _Traits, _Alloc>::basic_string [其中 _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char>]" 实例 hkjm D:\NXopen\BaiduSyncdisk\studio\hkjm\hkjm.cpp 353
08-07
<think>我们注意到错误集中在字符串构造上。在代码中,我们尝试使用`std::string`的构造函数来从一个`const char*`和一个`std::string`拼接,但错误提示没有匹配的构造函数。实际上,我们使用的是`+=`操作符,而不是构造函数。但是,错误信息指向的是`std::string`的构造函数,这可能是由于`curve->JournalIdentifier()`返回的类型不是`const char*`,而是`NXString`类型。 在NX Open中,`JournalIdentifier()`返回的是`NXString`,而`NXString`可以隐式转换为`const char*`,但有时可能需要显式转换。另外,在拼接字符串时,我们可能需要将`NXString`显式转换为`const char*`或`std::string`。 修正方法:将`curve->JournalIdentifier()`显式转换为`const char*`,或者使用`GetText()`方法(如果可用)来获取C字符串。 但是,查看NX Open文档,`JournalIdentifier`返回的是`NXString`,我们可以使用`GetText()`方法获取`const char*`,或者直接使用`std::string`的构造函数进行转换。 我们可以这样修改: ```cpp logMsg += "曲线1: " + std::string(curve->JournalIdentifier().GetText()) + "\n"; ``` 或者更简洁的方式是使用`NXString`的`GetText()`方法: ```cpp logMsg += std::string("曲线1: ") + curve->JournalIdentifier().GetText() + "\n"; ``` 但是,请注意,`GetText()`返回的是`const char*`,因此我们可以直接与`std::string`相加。 因此,我们将所有出现类似错误的地方进行修改,将`JournalIdentifier()`替换为`JournalIdentifier().GetText()`。 另外,在获取实体(Body)的日志标识符时,同样使用`GetText()`。 修改以下三行(实际上在代码中多次出现): 1. 曲线1的日志输出 2. 曲线2的日志输出 3. 实体的日志输出 修改为: ```cpp logMsg += "曲线1: " + std::string(curve->JournalIdentifier().GetText()) + "\n"; logMsg += "曲线2: " + std::string(curve->JournalIdentifier().GetText()) + "\n"; logMsg += "实体: " + std::string(body->JournalIdentifier().GetText()) + "\n"; ``` 但是,由于`GetText()`返回的是`const char*`,我们也可以这样写(避免构造临时`std::string`): ```cpp logMsg = logMsg + "曲线1: " + curve->JournalIdentifier().GetText() + "\n"; ``` 因为`std::string`可以和一个`const char*`直接相加。 因此,我们可以将原来的: ```cpp logMsg += "曲线1: " + std::string(curve->JournalIdentifier()) + "\n"; ``` 改为: ```cpp logMsg += "曲线1: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; ``` 这种方式更高效,因为避免了创建临时字符串对象。 但是,为了代码简洁,我们也可以使用: ```cpp logMsg += std::string("曲线1: ") + curve->JournalIdentifier().GetText() + "\n"; ``` 这里,第一个字符串字面量被构造为`std::string`,然后与`const char*`相加,再与`"\n"`相加。 考虑到错误提示,我们选择使用`GetText()`来确保类型匹配。 因此,我们修改代码中所有使用`JournalIdentifier()`的地方,改为`JournalIdentifier().GetText()`。 另外,在矢量方向输出部分,我们使用`std::to_string`,这个没有问题。 修改后的代码片段如下(以曲线1为例): ```cpp logMsg += "曲线1: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; ``` 或者在一行内完成: ```cpp logMsg += std::string("曲线1: ") + curve->JournalIdentifier().GetText() + "\n"; ``` 我们选择第二种方式,因为它更简洁。 现在,我们修改`apply_cb`函数中的三处: 1. 曲线1的日志输出(第251行左右): ```cpp logMsg += "曲线1: " + std::string(curve->JournalIdentifier().GetText()) + "\n"; ``` 实际上,`JournalIdentifier().GetText()`已经是`const char*`,所以我们可以直接: ```cpp logMsg += "曲线1: " + std::string(curve->JournalIdentifier().GetText()) + "\n"; ``` 但这样写有点多余,可以简化为: ```cpp logMsg += std::string("曲线1: ") + curve->JournalIdentifier().GetText() + "\n"; ``` 或者更直接: ```cpp logMsg = logMsg + "曲线1: " + curve->JournalIdentifier().GetText() + "\n"; ``` 我们采用最后一种方式,因为这样写清晰且效率可以接受。 但是,注意`logMsg`是一个`std::string`,所以可以这样写: ```cpp logMsg += "曲线1: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; ``` 这种方式效率更高,因为避免了多次创建临时字符串。 为了代码可读性,我们选择分三行写。 2. 同样修改曲线2和实体的日志输出。 修改后的代码片段: ```cpp // 曲线1 if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves1.push_back(curve); logMsg += "曲线1: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; // 示例:设置曲线颜色为186号色 UF_OBJ_set_color(obj->Tag(), 186); } // 曲线2 if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves2.push_back(curve); logMsg += "曲线2: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; } // 实体 if (Body* body = dynamic_cast<Body*>(obj)) { bodies.push_back(body); logMsg += "实体: "; logMsg += body->JournalIdentifier().GetText(); logMsg += "\n"; } ``` 这样修改后,应该可以解决字符串构造的问题。 另外,注意错误提示中还有三个位置(第251、271、353行),我们按照上述方法修改这三个位置。 最后,重新编译代码,应该可以消除这些错误。 注意:在NX Open中,`GetText()`方法返回的是以UTF-8编码的字符串,而我们的日志信息是英文和中文混合,但中文字符在UTF-8下可以正常处理。如果遇到乱码,可能需要调整输出窗口的编码,但NX消息框支持UTF-8。 修改后的`apply_cb`函数中相关部分如下: ```cpp // ===== 1. 获取曲线选择器1的值 ===== std::vector<Curve*> curves1; if (hk1edge) { PropertyList* props = hk1edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves1.push_back(curve); // 修改字符串拼接方式 logMsg += "曲线1: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; // 示例:设置曲线颜色为186号色 UF_OBJ_set_color(obj->Tag(), 186); } } // 更新控件中的选择对象(如果需要保留修改) props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; // 必须删除属性对象 } // ===== 2. 获取曲线选择器2的值 ===== std::vector<Curve*> curves2; if (hk2edge) { PropertyList* props = hk2edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves2.push_back(curve); logMsg += "曲线2: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // ... 其他代码 ... // ===== 9. 获取选中的实体 ===== std::vector<Body*> bodies; if (bodySelect0) { PropertyList* props = bodySelect0->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Body* body = dynamic_cast<Body*>(obj)) { bodies.push_back(body); logMsg += "实体: "; logMsg += body->JournalIdentifier().GetText(); logMsg += "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } ``` 这样修改后,应该可以解决编译错误。 如果还有错误,请检查其他部分,比如是否遗漏了某个`JournalIdentifier()`的转换。另外,确保所有代码中的字符串拼接都采用这种方式。 注意:在矢量方向输出部分,我们使用的是`std::to_string`,它返回`std::string`,所以没有问题。 最后,我们重新编译整个项目。</think>您的代码在字符串拼接时出现了问题,主要是由于`JournalIdentifier()`返回的是NXOpen的`NXString`类型,而不是标准的`const char*`或`std::string`。以下是修复后的代码: ```cpp // 修复字符串拼接问题 int hkjm::apply_cb() { int errorCode = 0; std::string logMsg; try { // ===== 1. 获取曲线选择器1的值 ===== std::vector<Curve*> curves1; if (hk1edge) { PropertyList* props = hk1edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves1.push_back(curve); // 修复字符串拼接:使用NXString::GetText()获取C字符串 logMsg += "曲线1: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; // 设置曲线颜色 UF_OBJ_set_color(obj->Tag(), 186); } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // ===== 2. 获取曲线选择器2的值 ===== std::vector<Curve*> curves2; if (hk2edge) { PropertyList* props = hk2edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { curves2.push_back(curve); // 修复字符串拼接 logMsg += "曲线2: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // ... 其他代码保持不变 ... // ===== 9. 获取选中的实体 ===== std::vector<Body*> bodies; if (bodySelect0) { PropertyList* props = bodySelect0->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Body* body = dynamic_cast<Body*>(obj)) { bodies.push_back(body); // 修复字符串拼接 logMsg += "实体: "; logMsg += body->JournalIdentifier().GetText(); logMsg += "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // ... 其他代码保持不变 ... // ===== 输出所有获取的值 ===== theUI->NXMessageBox()->Show("控件值获取结果", NXMessageBox::DialogTypeInformation, logMsg.c_str()); } catch (std::exception& ex) { errorCode = 1; std::string errorMsg = "获取控件值错误: "; errorMsg += ex.what(); theUI->NXMessageBox()->Show("错误", NXMessageBox::DialogTypeError, errorMsg.c_str()); } catch (...) { errorCode = 1; theUI->NXMessageBox()->Show("错误", NXMessageBox::DialogTypeError, "未知获取控件值错误"); } return errorCode; } ``` ### 问题分析与修复说明: 1. **问题原因**: - `curve->JournalIdentifier()` 返回的是 `NXOpen::NXString` 类型 - 不能直接与 `std::string` 拼接 - 错误信息:`E0289 没有与参数列表匹配的构造函数` 2. **解决方案**: - 使用 `GetText()` 方法获取 C 风格字符串 - 分步拼接字符串,避免混合类型 ```cpp logMsg += "曲线1: "; // 添加前缀 logMsg += curve->JournalIdentifier().GetText(); // 添加NXString内容 logMsg += "\n"; // 添加后缀 ``` 3. **NXString 的正确用法**: ```cpp // 获取NXString NXOpen::NXString nxStr = curve->JournalIdentifier(); // 转换为std::string std::string stdStr = nxStr.GetText(); // 或者直接使用GetText()拼接 logMsg += std::string("标识符: ") + nxStr.GetText(); ``` ### 完整修复后的 apply_cb 函数: ```cpp int hkjm::apply_cb() { int errorCode = 0; std::string logMsg; try { // 1. 曲线选择器1 if (hk1edge) { PropertyList* props = hk1edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { logMsg += "曲线1: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; UF_OBJ_set_color(obj->Tag(), 186); } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // 2. 曲线选择器2 if (hk2edge) { PropertyList* props = hk2edge->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Curve* curve = dynamic_cast<Curve*>(obj)) { logMsg += "曲线2: "; logMsg += curve->JournalIdentifier().GetText(); logMsg += "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // 3. 实体选择器 if (bodySelect0) { PropertyList* props = bodySelect0->GetProperties(); std::vector<TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (TaggedObject* obj : selObjs) { if (Body* body = dynamic_cast<Body*>(obj)) { logMsg += "实体: "; logMsg += body->JournalIdentifier().GetText(); logMsg += "\n"; } } props->SetTaggedObjectVector("SelectedObjects", selObjs); delete props; } // 4. 表达式值获取 if (hk1sd) { PropertyList* props = hk1sd->GetProperties(); double value = props->GetDouble("Value"); logMsg += "hk1sd值: " + std::to_string(value) + "\n"; delete props; } // 5. 颜色选择器 if (color1) { PropertyList* props = color1->GetProperties(); std::vector<int> colors = props->GetIntegerVector("Value"); if (!colors.empty()) { logMsg += "颜色1索引: " + std::to_string(colors[0]) + "\n"; } delete props; } // 显示结果 theUI->NXMessageBox()->Show("结果", NXMessageBox::DialogTypeInformation, logMsg.c_str()); } catch (std::exception& ex) { errorCode = 1; std::string errorMsg = "错误: "; errorMsg += ex.what(); theUI->NXMessageBox()->Show("错误", NXMessageBox::DialogTypeError, errorMsg.c_str()); } catch (...) { errorCode = 1; theUI->NXMessageBox()->Show("错误", NXMessageBox::DialogTypeError, "未知错误"); } return errorCode; } ``` ### 其他改进建议: 1. **使用RAII管理PropertyList**: ```cpp class ScopedPropertyList { PropertyList* m_props; public: ScopedPropertyList(Block* block) : m_props(block->GetProperties()) {} ~ScopedPropertyList() { delete m_props; } PropertyList* operator->() { return m_props; } }; // 使用示例: if (hk1sd) { ScopedPropertyList props(hk1sd); double value = props->GetDouble("Value"); // 不需要手动delete,析构时自动释放 } ``` 2. **NXString转换辅助函数**: ```cpp std::string NXStringToStdString(const NXOpen::NXString& nxStr) { return std::string(nxStr.GetText()); } // 使用示例: logMsg += "实体: " + NXStringToStdString(body->JournalIdentifier()) + "\n"; ``` 3. **日志构建优化**: ```cpp void AppendLog(std::string& log, const std::string& prefix, const NXOpen::NXString& value) { log += prefix; log += value.GetText(); log += "\n"; } // 使用示例: AppendLog(logMsg, "曲线1: ", curve->JournalIdentifier()); ```
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