关于链表和“->”符号的一点思考

本文解释了如何在编程中使用结构体来实现链表,包括如何定义结构体、使用结构体变量及指针访问结构体成员的区别。并详细阐述了“->”与“.”运算符的不同之处。

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常规单链表的实现方式是定义一个结构体,结构体中定义一个存放数据的变量和一个指向下一个节点的指针,在初次接触链表时,接触到了一个符号“->”,笔者在学习时,最开始常常把它和“.”傻傻分不清楚,对于这种状况,首先要搞清楚一点,结构体也是数据类型的一种,跟“int”"char"一样,定义一个结构体后结构体中的变量也就可以被这个结构体定义的变量访问.结构体的作用即对一个东西进行封装,封装之后方便以后使用,使用了这个类型的变量都会具有这个结构的属性。

其实结构体变量访问结构体元素,例如a.b,那么当a是指针变量时,a->b等价为(&a).b。如果用“.”,只需要声明一个结构体,然后用结构体名加“.”加域名就可以引用域了,因为计算机自动分配了结构体的内存,就像int a一样,(操作栈内存)

用->的话必须声明一个结构体的指针,还要手动开启一个该结构体的内存,将返回的指针给声明的结构体指针才能用->正确引用,否则内存中只分配了指针的内存,没有分配结构体的内存,想要的结构体实际上不存在,这时候用->引用自然会出错,因为没有结构体,所以也不存在结构体域。(操作堆内存)

“.”可以读作“的”“->”可以读作“指向结构体的”

补充:“->”与“.”功能一样,都是访问结构体变量,但箭头绝对没有现实生活中箭头的指向作用,它只表示用一个指针访问结构体变量,链表中节点的链接过程跟“->”没有关系,链表节点的链接是通过指针指向链接的,编程中表现为给指针变量赋值,实质是把后一个节点的首地址赋给前一个节点的pNext,箭头非指向,不注意这点会对理解链表产生困扰。




我正在学习NX二次开发,用的是Visual Studio 2019,ug版本是12.0,开发平台是c++,uf函数为主nxopen函数为辅。需要你辅助我开发,重点注意开发模版是c++,优先使用uf函数,要求你先搞清楚你提供给我的代码真实有效性,语句与标点符号的正确位置,避免出现ug12.0没有提供的接口成员出现!确保所有方法调用都符合 NX12 的 API 签名,深度思考下再回答,每次回答前先回顾下前面的所有对话避免问题重复出现,每行代码都用中文注解具体意思与作用。 //============================================================================== // 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\daoqiaotool\ui\daoqiaotool.cpp // // This file was generated by the NX Block UI Styler // Created by: MICH-ROG // Version: NX 12 // Date: 08-16-2025 (Format: mm-dd-yyyy) // Time: 17:45 (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 "daoqiaotool.hpp" using namespace NXOpen; using namespace NXOpen::BlockStyler; //------------------------------------------------------------------------------ // Initialize static variables //------------------------------------------------------------------------------ Session *(daoqiaotool::theSession) = NULL; UI *(daoqiaotool::theUI) = NULL; //------------------------------------------------------------------------------ // Constructor for NX Styler class //------------------------------------------------------------------------------ daoqiaotool::daoqiaotool() { try { // Initialize the NX Open C++ API environment daoqiaotool::theSession = NXOpen::Session::GetSession(); daoqiaotool::theUI = UI::GetUI(); theDlxFileName = "daoqiaotool.dlx"; theDialog = daoqiaotool::theUI->CreateDialog(theDlxFileName); // Registration of callback functions theDialog->AddApplyHandler(make_callback(this, &daoqiaotool::apply_cb)); theDialog->AddOkHandler(make_callback(this, &daoqiaotool::ok_cb)); theDialog->AddUpdateHandler(make_callback(this, &daoqiaotool::update_cb)); theDialog->AddInitializeHandler(make_callback(this, &daoqiaotool::initialize_cb)); theDialog->AddDialogShownHandler(make_callback(this, &daoqiaotool::dialogShown_cb)); } catch(exception& ex) { //---- Enter your exception handling code here ----- throw; } } //------------------------------------------------------------------------------ // Destructor for NX Styler class //------------------------------------------------------------------------------ daoqiaotool::~daoqiaotool() { 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) { daoqiaotool *thedaoqiaotool = NULL; try { UF_initialize(); //开发的许可函数,初始化 thedaoqiaotool = new daoqiaotool(); // The following method shows the dialog immediately thedaoqiaotool->Show(); } catch(exception& ex) { //---- Enter your exception handling code here ----- daoqiaotool::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } if(thedaoqiaotool != NULL) { delete thedaoqiaotool; thedaoqiaotool = 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 ----- daoqiaotool::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } } int daoqiaotool::Show() { try { theDialog->Show(); } catch(exception& ex) { //---- Enter your exception handling code here ----- daoqiaotool::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } return 0; } //------------------------------------------------------------------------------ //---------------------Block UI Styler Callback Functions-------------------------- //------------------------------------------------------------------------------ //------------------------------------------------------------------------------ //Callback Name: initialize_cb //------------------------------------------------------------------------------ void daoqiaotool::initialize_cb() { try { group2 = dynamic_cast<NXOpen::BlockStyler::Group*>(theDialog->TopBlock()->FindBlock("group2")); enum0 = dynamic_cast<NXOpen::BlockStyler::Enumeration*>(theDialog->TopBlock()->FindBlock("enum0")); group0 = dynamic_cast<NXOpen::BlockStyler::Group*>(theDialog->TopBlock()->FindBlock("group0")); chuliao_edge = dynamic_cast<NXOpen::BlockStyler::CurveCollector*>(theDialog->TopBlock()->FindBlock("chuliao_edge")); bianjie_edge = dynamic_cast<NXOpen::BlockStyler::CurveCollector*>(theDialog->TopBlock()->FindBlock("bianjie_edge")); group = dynamic_cast<NXOpen::BlockStyler::Group*>(theDialog->TopBlock()->FindBlock("group")); expression_clcq = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("expression_clcq")); expression_dqjiaodu = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("expression_dqjiaodu")); group1 = dynamic_cast<NXOpen::BlockStyler::Group*>(theDialog->TopBlock()->FindBlock("group1")); vector0 = dynamic_cast<NXOpen::BlockStyler::SpecifyVector*>(theDialog->TopBlock()->FindBlock("vector0")); expression_daoxie = dynamic_cast<NXOpen::BlockStyler::ExpressionBlock*>(theDialog->TopBlock()->FindBlock("expression_daoxie")); } catch(exception& ex) { //---- Enter your exception handling code here ----- daoqiaotool::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 daoqiaotool::dialogShown_cb() { try { //---- Enter your callback code here ----- } catch(exception& ex) { //---- Enter your exception handling code here ----- daoqiaotool::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } } //------------------------------------------------------------------------------ //Callback Name: apply_cb //------------------------------------------------------------------------------ int daoqiaotool::apply_cb() { int errorCode = 0; try { // 获取NX会话工作部件 NXOpen::Session* theSession = NXOpen::Session::GetSession(); NXOpen::Part* workPart = theSession->Parts()->Work(); NXOpen::UI* theUI = NXOpen::UI::GetUI(); // ===== 1. 获取用户界面输入参数 ===== // 获取出料边曲线 std::vector<NXOpen::Curve*> dischargeCurves; if (chuliao_edge) { std::unique_ptr<NXOpen::BlockStyler::PropertyList> props(chuliao_edge->GetProperties()); std::vector<NXOpen::TaggedObject*> selObjs = props->GetTaggedObjectVector("SelectedObjects"); for (NXOpen::TaggedObject* obj : selObjs) { if (NXOpen::Curve* curve = dynamic_cast<NXOpen::Curve*>(obj)) { dischargeCurves.push_back(curve); // 将选中的曲线添加到出料边曲线列表 } } } // ====== 1. 获取选中的边对象 ====== std::vector<NXOpen::Edge*> selectedEdges; if (bianjie_edge) { // 直接获取选中的对象 std::vector<NXOpen::TaggedObject*> selObjs = bianjie_edge->GetSelectedObjects(); // 遍历所有选中对象,筛选出边类型 for (NXOpen::TaggedObject* obj : selObjs) { if (NXOpen::Edge* edge = dynamic_cast<NXOpen::Edge*>(obj)) { selectedEdges.push_back(edge); } } } // 获取出料沉桥值 double materialThickness = 0.0; if (expression_clcq) { std::unique_ptr<NXOpen::BlockStyler::PropertyList> props(expression_clcq->GetProperties()); materialThickness = props->GetDouble("Value"); // 从表达式控件获取数值 } // 获取倒桥角度值 double currentAngle = 0.0; if (expression_dqjiaodu) { std::unique_ptr<NXOpen::BlockStyler::PropertyList> props(expression_dqjiaodu->GetProperties()); currentAngle = props->GetDouble("Value"); // 从表达式控件获取数值 } // 获取倒斜角深度值 double daoxieValue = 0.0; if (expression_daoxie) { std::unique_ptr<NXOpen::BlockStyler::PropertyList> props(expression_clcq->GetProperties()); materialThickness = props->GetDouble("Value"); // 从表达式控件获取数值 } // 获取矢量方向(默认Z轴方向) NXOpen::Vector3d directionVector(0.0, 0.0, 1.0); if (vector0) { std::unique_ptr<NXOpen::BlockStyler::PropertyList> props(vector0->GetProperties()); directionVector = props->GetVector("Vector"); // 获取用户指定的矢量方向 } //获取ui枚举索引值 int iType = 0; iType = this->enum0->GetProperties()->GetEnum("Value"); if (iType == 0) { } else { } //---- Enter your callback code here ----- } catch(exception& ex) { //---- Enter your exception handling code here ----- errorCode = 1; daoqiaotool::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } return errorCode; } //------------------------------------------------------------------------------ //Callback Name: update_cb //------------------------------------------------------------------------------ int daoqiaotool::update_cb(NXOpen::BlockStyler::UIBlock* block) { try { if(block == enum0) { //---------Enter your code here----------- } else if(block == chuliao_edge) { //---------Enter your code here----------- } else if(block == bianjie_edge) { //---------Enter your code here----------- } else if(block == expression_clcq) { //---------Enter your code here----------- } else if(block == expression_dqjiaodu) { //---------Enter your code here----------- } else if(block == vector0) { //---------Enter your code here----------- } else if(block == expression_daoxie) { //---------Enter your code here----------- } } catch(exception& ex) { //---- Enter your exception handling code here ----- daoqiaotool::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } return 0; } //------------------------------------------------------------------------------ //Callback Name: ok_cb //------------------------------------------------------------------------------ int daoqiaotool::ok_cb() { int errorCode = 0; try { errorCode = apply_cb(); } catch(exception& ex) { //---- Enter your exception handling code here ----- errorCode = 1; daoqiaotool::theUI->NXMessageBox()->Show("Block Styler", NXOpen::NXMessageBox::DialogTypeError, ex.what()); } return errorCode; } //------------------------------------------------------------------------------ //Function Name: GetBlockProperties //Description: Returns the propertylist of the specified BlockID //------------------------------------------------------------------------------ PropertyList* daoqiaotool::GetBlockProperties(const char *blockID) { return theDialog->GetBlockProperties(blockID); } 帮我把下面拉伸的功能加到上面“if (iType == 0) {”里面,拉伸截面用“chuliao_edge”,起始位置用“expression_clcq”,结束位置固定“100”,取消偏置,方向用“vector0”, 拔模用“expression_dqjiaodu”,“动态偏置方向判断”改为“动态拔模方向判断”,取消曲线配对部分,直接用“bianjie_edge”做投影判断,:以下是参考部分“try { // 设置撤销标记 NXOpen::Session::UndoMarkId markId2 = theSession->SetUndoMark( NXOpen::Session::MarkVisibilityVisible, "出料边拉伸求差"); // 验证延伸曲线是否可用 if (extendedCurves.empty()) { throw std::runtime_error("没有可用的延伸曲线作为拉伸截面"); } // 选择第一条延伸曲线作为拉伸截面 NXOpen::Curve* curveForExtrude = extendedCurves[0]; // 创建主拉伸构建器(用于最终特征) NXOpen::Features::ExtrudeBuilder* mainExtrudeBuilder = workPart->Features()->CreateExtrudeBuilder(nullptr); // 创建主截面对象(独立资源) NXOpen::Section* mainSection = workPart->Sections()->CreateSection( 0.001, 0.001, 0.05); // 距离公差0.001mm,角度公差0.05度 mainExtrudeBuilder->SetSection(mainSection); // 创建曲线选择规则 std::vector<NXOpen::Curve*> sectionCurves2; sectionCurves2.push_back(curveForExtrude); NXOpen::SelectionIntentRule* curveRule2 = workPart->ScRuleFactory()->CreateRuleCurveDumb(sectionCurves2); // 获取曲线中点作为帮助点 NXOpen::Point3d helpPoint2(0.0, 0.0, 0.0); { tag_t curveTag = curveForExtrude->Tag(); UF_EVAL_p_t evaluator = NULL; double limits[2]; if (UF_EVAL_initialize(curveTag, &evaluator) == 0) { if (UF_EVAL_ask_limits(evaluator, limits) == 0) { if (limits[0] > limits[1]) std::swap(limits[0], limits[1]); double midParam = (limits[0] + limits[1]) / 2.0; double midPoint[3]; if (UF_EVAL_evaluate(evaluator, 0, midParam, midPoint, NULL) == 0) { helpPoint2 = NXOpen::Point3d(midPoint[0], midPoint[1], midPoint[2]); } } UF_EVAL_free(evaluator); } } // 添加曲线到主截面 std::vector<NXOpen::SelectionIntentRule*> rules2; rules2.push_back(curveRule2); mainSection->AddToSection( rules2, // 曲线规则集合 curveForExtrude, // 主要曲线对象 nullptr, // 不指定曲线起点 nullptr, // 不指定曲线终点 helpPoint2, // 帮助点(中点) NXOpen::Section::ModeCreate // 创建模式 ); // 设置拉伸方向(与第一个拉伸相同) NXOpen::Point3d origin(0.0, 0.0, 0.0); NXOpen::Direction* extrudeDirection2 = workPart->Directions()->CreateDirection( origin, directionVector, // 使用相同的方向矢量 NXOpen::SmartObject::UpdateOptionWithinModeling ); mainExtrudeBuilder->SetDirection(extrudeDirection2); // 设置拉伸范围 NXOpen::GeometricUtilities::Limits* limitsObj2 = mainExtrudeBuilder->Limits(); // 起始距离 = 材料厚度(与第一个拉伸相同) limitsObj2->StartExtend()->Value()->SetRightHandSide( std::to_string(materialThickness).c_str()); // 结束距离 = 扫描高度 + 10mm limitsObj2->EndExtend()->Value()->SetRightHandSide( std::to_string(scanHeight + 10.0).c_str()); // ===== 关键修改:动态偏置方向判断逻辑 ===== double endOffsetValue = 100.0; // 默认正偏置100mm bool canProject = false; // 投影验证结果标志 // ===== 第一步:创建临时拉伸体进行投影验证(使用独立资源)===== try { // 创建临时拉伸构建器(用于投影验证) NXOpen::Features::ExtrudeBuilder* tempExtrudeBuilder = workPart->Features()->CreateExtrudeBuilder(nullptr); // 创建临时截面(不与主截面共享) NXOpen::Section* tempSection = workPart->Sections()->CreateSection( 0.001, 0.001, 0.05); tempExtrudeBuilder->SetSection(tempSection); // 复制曲线规则到临时截面 std::vector<NXOpen::Curve*> tempCurves; tempCurves.push_back(curveForExtrude); NXOpen::SelectionIntentRule* tempRule = workPart->ScRuleFactory()->CreateRuleCurveDumb(tempCurves); std::vector<NXOpen::SelectionIntentRule*> tempRules; tempRules.push_back(tempRule); tempSection->AddToSection( tempRules, curveForExtrude, nullptr, nullptr, helpPoint2, NXOpen::Section::ModeCreate ); // 复制方向设置 tempExtrudeBuilder->SetDirection(extrudeDirection2); // 复制拉伸范围 NXOpen::GeometricUtilities::Limits* tempLimits = tempExtrudeBuilder->Limits(); tempLimits->StartExtend()->Value()->SetRightHandSide( std::to_string(materialThickness).c_str()); tempLimits->EndExtend()->Value()->SetRightHandSide( std::to_string(scanHeight + 10.0).c_str()); // 设置临时偏置(默认正偏置100) NXOpen::GeometricUtilities::FeatureOffset* tempOffset = tempExtrudeBuilder->Offset(); tempOffset->SetOption(NXOpen::GeometricUtilities::TypeNonsymmetricOffset); tempOffset->StartOffset()->SetRightHandSide("0"); tempOffset->EndOffset()->SetRightHandSide("100"); // 设置布尔操作类型为创建(避免影响模型) tempExtrudeBuilder->BooleanOperation()->SetType( NXOpen::GeometricUtilities::BooleanOperation::BooleanTypeCreate); // 提交临时拉伸特征 NXOpen::NXObject* tempFeature = tempExtrudeBuilder->Commit(); // 检查是否成功创建特征 if (!tempFeature) { throw std::runtime_error("临时拉伸特征创建失败"); } // 获取临时实体 std::vector<NXOpen::Body*> tempBodies; if (NXOpen::Features::Extrude* extrudeFeature = dynamic_cast<NXOpen::Features::Extrude*>(tempFeature)) { tempBodies = extrudeFeature->GetBodies(); } // ===== 曲线配对逻辑(找出与第一条延伸曲线配对的边界曲线)===== NXOpen::Curve* targetBoundaryCurve = nullptr; { // 1. 确保有两条延伸曲线两条边界曲线 if (extendedCurves.size() < 2 || boundaryCurves.size() < 2) { throw std::runtime_error("需要两条延伸曲线两条边界曲线"); } // 2. 获取两条延伸曲线两条边界曲线 NXOpen::Curve* extCurve1 = extendedCurves[0]; NXOpen::Curve* extCurve2 = extendedCurves[1]; NXOpen::Curve* bndCurve1 = boundaryCurves[0]; NXOpen::Curve* bndCurve2 = boundaryCurves[1]; // 3. 计算所有曲线的中点 struct CurveMidPoint { NXOpen::Curve* curve; double midPoint[3]; }; // 计算中点函数 auto calculateMidPoint = [](NXOpen::Curve* curve) -> double* { static double midPoint[3] = { 0 }; UF_EVAL_p_t evaluator = NULL; if (UF_EVAL_initialize(curve->Tag(), &evaluator) == 0) { double limits[2]; if (UF_EVAL_ask_limits(evaluator, limits) == 0) { double midParam = (limits[0] + limits[1]) / 2.0; UF_EVAL_evaluate(evaluator, 0, midParam, midPoint, NULL); } UF_EVAL_free(evaluator); } return midPoint; }; // 存储所有曲线的中点 CurveMidPoint extMid1 = { extCurve1, {0} }; memcpy(extMid1.midPoint, calculateMidPoint(extCurve1), 3 * sizeof(double)); CurveMidPoint extMid2 = { extCurve2, {0} }; memcpy(extMid2.midPoint, calculateMidPoint(extCurve2), 3 * sizeof(double)); CurveMidPoint bndMid1 = { bndCurve1, {0} }; memcpy(bndMid1.midPoint, calculateMidPoint(bndCurve1), 3 * sizeof(double)); CurveMidPoint bndMid2 = { bndCurve2, {0} }; memcpy(bndMid2.midPoint, calculateMidPoint(bndCurve2), 3 * sizeof(double)); // 4. 计算距离函数 auto distance = [](double p1[3], double p2[3]) -> double { double dx = p1[0] - p2[0]; double dy = p1[1] - p2[1]; double dz = p1[2] - p2[2]; return sqrt(dx * dx + dy * dy + dz * dz); }; // 5. 计算所有可能的距离组合 double d11 = distance(extMid1.midPoint, bndMid1.midPoint); // 延伸1-边界1 double d12 = distance(extMid1.midPoint, bndMid2.midPoint); // 延伸1-边界2 double d21 = distance(extMid2.midPoint, bndMid1.midPoint); // 延伸2-边界1 double d22 = distance(extMid2.midPoint, bndMid2.midPoint); // 延伸2-边界2 // 6. 找出最短距离的组合 struct Pairing { NXOpen::Curve* extCurve; NXOpen::Curve* bndCurve; double distance; }; std::vector<Pairing> allPairs = { {extCurve1, bndCurve1, d11}, {extCurve1, bndCurve2, d12}, {extCurve2, bndCurve1, d21}, {extCurve2, bndCurve2, d22} }; // 7. 找出最短距离的组合 auto minPair = *std::min_element(allPairs.begin(), allPairs.end(), [](const Pairing& a, const Pairing& b) { return a.distance < b.distance; }); // 8. 从原始集合中移除已配对的曲线 std::vector<NXOpen::Curve*> remainingExtCurves = { extCurve1, extCurve2 }; std::vector<NXOpen::Curve*> remainingBndCurves = { bndCurve1, bndCurve2 }; auto removeCurve = [](std::vector<NXOpen::Curve*>& vec, NXOpen::Curve* curve) { vec.erase(std::remove(vec.begin(), vec.end(), curve), vec.end()); }; removeCurve(remainingExtCurves, minPair.extCurve); removeCurve(remainingBndCurves, minPair.bndCurve); // 9. 创建最终配对结果 std::vector<std::pair<NXOpen::Curve*, NXOpen::Curve*>> closestPairs; // 第一对:最短距离组合 closestPairs.push_back({ minPair.extCurve, minPair.bndCurve }); // 第二对:剩余曲线组合 if (!remainingExtCurves.empty() && !remainingBndCurves.empty()) { closestPairs.push_back({ remainingExtCurves[0], remainingBndCurves[0] }); } // 10. 验证配对结果 if (closestPairs.size() != 2) { throw std::runtime_error("无法创建完整的配对组合"); } // 11. 找出与extendedCurves[0]配对的边界曲线 for (const auto& pair : closestPairs) { if (pair.first == curveForExtrude) { // 使用当前截面曲线 targetBoundaryCurve = pair.second; break; } } //// 12. 高亮显示目标边界曲线 //if (targetBoundaryCurve) { // UF_DISP_set_highlight(targetBoundaryCurve->Tag(), 1); // 高亮显示 // UF_DISP_refresh(); //} } // ===== 投影验证逻辑 ===== canProject = false; if (targetBoundaryCurve && !tempBodies.empty()) { // 创建曲线链表 uf_list_p_t curveList = NULL; if (UF_MODL_create_list(&curveList) == 0) { // 添加目标边界曲线到链表 tag_t curveTag = targetBoundaryCurve->Tag(); if (UF_MODL_put_list_item(curveList, curveTag) == 0) { // 获取实体所有面 uf_list_p_t faceList = NULL; tag_t bodyTag = tempBodies[0]->Tag(); if (UF_MODL_ask_body_faces(bodyTag, &faceList) == 0) { // 归一化投影方向 double dirMagnitude = sqrt(directionVector.X * directionVector.X + directionVector.Y * directionVector.Y + directionVector.Z * directionVector.Z); if (dirMagnitude > 1e-6) { double projDirection[3] = { directionVector.X / dirMagnitude, directionVector.Y / dirMagnitude, directionVector.Z / dirMagnitude }; // 执行投影 tag_t projCurveFeatTag = NULL_TAG; int status = UF_MODL_create_proj_curves( curveList, // 输入曲线列表 faceList, // 目标面列表 0, // 使用投影向量 projDirection, // 投影方向矢量 &projCurveFeatTag ); // 处理投影结果 if (status == 0 && projCurveFeatTag != NULL_TAG) { canProject = true; // 删除临时投影特征 UF_OBJ_delete_object(projCurveFeatTag); } } // 释放面链表 UF_MODL_delete_list(&faceList); } } // 释放曲线链表 UF_MODL_delete_list(&curveList); } } // ===== 清理临时资源 ===== // 销毁临时构建器 tempExtrudeBuilder->Destroy(); // 销毁临时截面 tempSection->Destroy(); // 删除临时特征 if (tempFeature) { std::vector<NXOpen::TaggedObject*> toDelete(1); toDelete[0] = tempFeature; theSession->UpdateManager()->AddObjectsToDeleteList(toDelete); } } catch (std::exception& ex) { // 临时验证失败时使用默认设置 canProject = false; char warnMsg[256]; snprintf(warnMsg, sizeof(warnMsg), "投影验证失败: %s\n使用默认偏置设置", ex.what()); theUI->NXMessageBox()->Show("MICH-明:提示警告", NXOpen::NXMessageBox::DialogTypeWarning, warnMsg); } // ===== 第二步:根据验证结果设置最终偏置值 ===== if (!canProject) { endOffsetValue = -100.0; // 负偏置-100mm } // ===== 设置偏置模式 ===== // 获取拉伸特征的偏置构建器 NXOpen::GeometricUtilities::FeatureOffset* featureOffset = mainExtrudeBuilder->Offset(); // 设置非对称偏置(两侧不同距离) featureOffset->SetOption(NXOpen::GeometricUtilities::TypeNonsymmetricOffset); // 设置具体偏置值 featureOffset->StartOffset()->SetRightHandSide("0"); // 起始端偏置0 // 动态设置偏置值 char offsetValueStr[32]; snprintf(offsetValueStr, sizeof(offsetValueStr), "%.2f", endOffsetValue); featureOffset->EndOffset()->SetRightHandSide(offsetValueStr); // 设置拔模类型:从起始位置简单拔模 mainExtrudeBuilder->Draft()->SetDraftOption( NXOpen::GeometricUtilities::SimpleDraft::SimpleDraftTypeSimpleFromStart); // 设置前拔模角度(从截面开始处拔模) mainExtrudeBuilder->Draft()->FrontDraftAngle()->SetRightHandSide( std::to_string(currentAngle).c_str()); // 设置后拔模角度(这里设为0,因为只需要单边拔模) mainExtrudeBuilder->Draft()->BackDraftAngle()->SetRightHandSide("0"); // ===== 设置布尔操作 ===== // 设置操作类型:求差(从第一个拉伸实体中减去此拉伸) mainExtrudeBuilder->BooleanOperation()->SetType( NXOpen::GeometricUtilities::BooleanOperation::BooleanTypeSubtract); // 设置目标体(第一个拉伸实体) std::vector<NXOpen::Body*> targetBodies; if (firstExtrudeBody) { targetBodies.push_back(firstExtrudeBody); mainExtrudeBuilder->BooleanOperation()->SetTargetBodies(targetBodies); } else { throw std::runtime_error("第一个拉伸实体未找到"); } // ===== 执行拉伸操作 ===== NXOpen::NXObject* featureNXObject2 = mainExtrudeBuilder->Commit(); // 检查是否成功创建特征 if (!featureNXObject2) { throw std::runtime_error("出料一创建失败"); } //// 显示偏置方向信息 //char offsetMsg[256]; //snprintf(offsetMsg, sizeof(offsetMsg), // "使用偏置方向: %s\n投影验证结果: %s", // (endOffsetValue > 0) ? "正偏置(100mm)" : "负偏置(-100mm)", // canProject ? "成功" : "失败"); //theUI->NXMessageBox()->Show("偏置设置", // NXOpen::NXMessageBox::DialogTypeInformation, offsetMsg); // 获取创建的实体 NXOpen::Features::Extrude* extrudeFeature2 = dynamic_cast<NXOpen::Features::Extrude*>(featureNXObject2); std::vector<NXOpen::Body*> resultBodies2; if (extrudeFeature2) { resultBodies2 = extrudeFeature2->GetBodies(); } // 清理资源 mainExtrudeBuilder->Destroy(); mainSection->Destroy();”
08-17
我正在学习NX二次开发,用的是Visual Studio 2019,ug版本是12.0,开发平台是c++,uf函数为主nxopen函数为辅。需要你辅助我开发,重点注意开发模版是c++,优先使用uf函数,要求你先搞清楚你提供给我的代码真实有效性,语句与标点符号的正确位置,避免出现ug12.0没有提供的接口成员出现!确保所有方法调用都符合 NX12 的 API 签名,深度思考下再回答,每次回答前先回顾下前面的所有对话避免问题重复出现,每行代码都用中文注解具体意思与作用。try { // 1. 获取当前显示部件 tag_t displayPart = UF_PART_ask_display_part(); if (displayPart == NULL_TAG) { theUI->NXMessageBox()->Show("MICH-明错误提示", NXMessageBox::DialogTypeError, "未找到显示部件!"); return 0; } // 2. 收集所有可见实体 std::vector<tag_t> allBodies; tag_t currentBody = NULL_TAG; UF_OBJ_cycle_objs_in_part(displayPart, UF_solid_type, &currentBody); while (currentBody != NULL_TAG) { UF_OBJ_disp_props_t disp_props; if (UF_OBJ_ask_display_properties(currentBody, &disp_props) == 0) { if (disp_props.blank_status == UF_OBJ_NOT_BLANKED) { int layer_status = 0; UF_LAYER_ask_status(disp_props.layer, &layer_status); if (layer_status == UF_LAYER_WORK_LAYER || layer_status == UF_LAYER_ACTIVE_LAYER || layer_status == UF_LAYER_REFERENCE_LAYER) { allBodies.push_back(currentBody); } } } UF_OBJ_cycle_objs_in_part(displayPart, UF_solid_type, &currentBody); } if (allBodies.empty()) { theUI->NXMessageBox()->Show("MICH-明提示", NXMessageBox::DialogTypeInformation, "部件中没有可见实体!"); return 0; } // 3. 收集需要着色的实体(修改部分) std::set<tag_t> targetBodies; const double normal_tolerance = 0.0175; // 法向容差≈1°(弧度) const double z_tolerance = 0.001; // Z坐标容差(1毫米) const double z_axis[3] = {0.0, 0.0, 1.0}; // Z轴方向向量 // 遍历所有实体 for (tag_t bodyTag : allBodies) { uf_list_p_t faceList = NULL; if (UF_MODL_ask_body_faces(bodyTag, &faceList) != 0) continue; int faceCount = 0; UF_MODL_ask_list_count(faceList, &faceCount); bool foundXYPlaneFace = false; // 标记是否找到与XY平面重合的面 // 遍历实体的每个面 for (int i = 0; i < faceCount && !foundXYPlaneFace; i++) { tag_t faceTag = NULL_TAG; UF_MODL_ask_list_item(faceList, i, &faceTag); int faceType = 0; if (UF_MODL_ask_face_type(faceTag, &faceType) != 0) continue; // 只处理平面 if (faceType == UF_MODL_PLANAR_FACE) { double direction[3] = {0}; // 面法向 double point[3] = {0}; // 面上一点 double box[6] = {0}; // 面边界框 double rad = 0, rad_data[2] = {0}; int status = 0; // 获取面几何数据 if (UF_MODL_ask_face_data(faceTag, &faceType, point, direction, box, &rad, rad_data, &status) == 0) { // 计算法向与Z轴的点积 double dot = z_axis[0] * direction[0] + z_axis[1] * direction[1] + z_axis[2] * direction[2]; // 检查是否为水平面(法向平行Z轴) if (fabs(fabs(dot) - 1.0) < normal_tolerance) { // 获取面的最低点Z坐标(边界框Zmin) double faceMinZ = box[2]; // 检查面是否与XY平面重合(Z坐标在容差范围内为0) if (fabs(faceMinZ) < z_tolerance) { foundXYPlaneFace = true; } } } } } // 如果找到至少一个与XY平面重合的面,则添加实体 if (foundXYPlaneFace) { targetBodies.insert(bodyTag); } UF_MODL_delete_list(&faceList); // 释放面列表内存 } // 4. 检查是否有符合条件的实体 if (targetBodies.empty()) { theUI->NXMessageBox()->Show("MICH-明提示", NXMessageBox::DialogTypeInformation, "未找到符合要求实体!"); return 0; } // 5. 着色处理 if (color5 != nullptr) { try { // 获取选择的颜色 PropertyList* colorProps = color5->GetProperties(); std::vector<int> colors = colorProps->GetIntegerVector("Value"); int colorID = colors[0]; delete colorProps; // 6. 为实体着色(保留面颜色重置) for (tag_t bodyTag : targetBodies) { // 重置实体所有面的颜色为继承 uf_list_p_t faceList = NULL; if (UF_MODL_ask_body_faces(bodyTag, &faceList) == 0) { int faceCount = 0; UF_MODL_ask_list_count(faceList, &faceCount); for (int i = 0; i < faceCount; i++) { tag_t faceTag = NULL_TAG; UF_MODL_ask_list_item(faceList, i, &faceTag); UF_OBJ_set_color(faceTag, colorID); // 0=继承实体颜色 } UF_MODL_delete_list(&faceList); } // 设置实体颜色 UF_OBJ_set_color(bodyTag, colorID); UF_DISP_set_highlight(bodyTag, 0); // 取消高亮 } UF_DISP_refresh(); // 刷新显示 // 显示结果信息 char msg[256]; snprintf(msg, sizeof(msg), "已为 %zu 个实体设置颜色", targetBodies.size()); theUI->NXMessageBox()->Show("着色完成", NXMessageBox::DialogTypeInformation, msg); } catch (std::exception& ex) { theUI->NXMessageBox()->Show("MICH-明提示:着色错误", NXMessageBox::DialogTypeError, ex.what()); } } else { theUI->NXMessageBox()->Show("MICH-明错误提示", NXMessageBox::DialogTypeError, "颜色选择控件未初始化!"); } } catch (std::exception& ex) { theUI->NXMessageBox()->Show("MICH-明:系统错误", NXMessageBox::DialogTypeError, ex.what()); }这是一段完整的按钮回调代码,现在我们来一步一步修改,着色部分先注释掉,从找到的XY平面重合的平面开始加代码,用int UF_MODL_ask_face_loops(tag_t face,uf_loop_p_t * loop_list)tag_t (tag_t类型) face Input(输入) 面的tag uf_loop_p_t * loop_list Output to be freed输出并释放 指向loop_list结构体的指针的地址。如果face没有循环,或者发生错误(' error' > 0),则返回null指针。使用euf_modl_delete_loop_list释放为这个链表分配的空间。 找出面的边界,并高亮显示出来,提示调试信息
08-05
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