AnsiString 使用大全

最新推荐文章于 2018-10-09 14:38:10 发布

转载最新推荐文章于 2018-10-09 14:38:10 发布 · 571 阅读

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本文介绍了ANSI字符串在编程中的基本操作与转换方法，包括ANSI字符串到字符、布尔值、整数、浮点数的转换，以及ANSI字符串到TColor类型的转换。此外，还提供了消除字符串部分字符、在字符串中插入字符、获取特定位置字符、查找字符和字符串、字符串长度检测、字符串去空格、检测双字节字符串、检测空字符串、字符串全小写或大写转换、Trim函数使用等实用技巧。

http://fangsz.bloghome.cn/posts/29160.html

程序设计 /金秋十月发表于2006-05-16, 10:59

最近编程用到AnsiString，从网上搜得此文章，向文章作者表示感谢

//Ansistring 转 char
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "哈哈";
    char *chr = Test.c_str();
}

//char转Ansistring
#include <windef.h>
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString str = "Sample";
    char chr[MAX_PATH];
    strcpy( chr , str.c_str() );
}

//Bool转AnsiString
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test=BoolToStr(CheckBox1->Checked);
}

//Ansistring转bool
void __fastcall TForm1::Button1Click(TObject *Sender)
{ AnsiString Test="-1"
CheckBox1->Checked= StrToBool( Test );
}

//int转ansistring
void __fastcall TForm1::Button1Click(TObject *Sender)
{
int i = 123;
AnsiString str = IntToStr( i );
}

//AnsiString转double
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test = "123";
long double d = StrToFloat( Test );
}

//double转AnsiString
void __fastcall TForm1::Button1Click(TObject *Sender)
{
double d = 123.456;
AnsiString str = FloatToStr( d );
}

//double转AnsiString并四舍五入
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    long double d = 123.456121212;
    AnsiString str = FloatToStrF( d , ffFixed ,5 , 4 );
//说明FloatTostrF里5代表从第几个数字的后一位开始四舍五入,4代表取4位小数。
//执行后得到str是123.4600。:roll:

}

//double转AnsiString使用类似vb的format函数
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    double d = 123.456;
    AnsiString str = FormatFloat( "000000.00" , d );
}
//得到 000123.45，当然你可以使用"# . , ; E+ E- xx"等符号，你自己试试 :wink:

//AnsiString转Tclor型
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "0x00FF8080";
    TColor Col = StringToColor( Test );
}

//Tcolor转AnsiString
void __fastcall TForm1::Button1Click(TObject *Sender)
{
TColor Col = 0x00FF8080;
AnsiString str = ColorToString( Col );
}

//消除AnsiString 中的一部分字符串代码:
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "ABCDEF";
    int First = 3;     // 消除制定开头
    int Length = 2;    // 消除制定长度
    AnsiString Dstr = Test.Delete( First , Length );
}//得到ABEF

//在AnsiString 中插入字符串
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "ABCDEF";
    AnsiString Ins = "12345";     // 插入串
    int Pos = 3;                  // 在哪插
    AnsiString Istr = Test.Insert( Ins , Pos );
//得到AB12345CDEF
}

//取得ansi某一位字符
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test = "ABCDEF";
AnsiString Npos = Test[3];//得到C
}

//取得AnsiString里最后一个字符
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test = "ABCDEF";
char *Lstr = Test.AnsiLastChar();//得到F
}

//取出AnsiString字符，这个类似vb的mid函数！
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "ABCDEF";
    int First = 3;     // 3开始取
    int Length = 2;    // 取2位
    AnsiString Getstr = Test.SubString( First , Length );
//得到CD
}

//AnsiString的字母比较
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "ABCDEF";
    AnsiString Sample = "abcdef";
    int Result = Test.AnsiCompare( Sample );
//返回1，不同！分大小写。
}

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "ABCDEF";
    AnsiString Sample = "abcdef";
    int Result = Test.AnsiCompareIC( Sample );
//返回0，相同！没有分大小写，哈哈
}

//在AnsiString中寻找字符
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "ABCDEF";
    AnsiString Sample = "E";
    int Result = Test.Pos( Sample );
//返回5，如果你写Sample＝"haha",就返回0，找不到，哈哈
}

//在AnsiString中找字符串，和上一个类似
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "ABCDEF";
    AnsiString Sample = "EF";
    int Result = Test.Pos( Sample );
//返回5，即E字符的位置
}

//判断字符串长度，类似vb的len
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test = "拿金币来";
int Len = Test.Length();
//返回8
}

//取得字符串，类似vb的left
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test = "小苹果然看了这篇文章";
AnsiString SLstr = Test.SetLength(6);
}//得到"小苹果"

//检测双字节字串
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString ChkStr = "你好";
int ChkPos = 1 ;
if ( ByteType( ChkStr , ChkPos ) == mbSingleByte ){
    Edit1->Text="0";
    }
    else{
    Edit1->Text="1";
    }//返回1，如果你写ChkStr＝"fxxk"，就返回0
}

//检测空字符串
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "";
    bool chk = Test.IsEmpty();
    if (chk )
    Edit1->Text="1";//返回1
}

//全部变小写vs全部变大写
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test = "ABCdef";
AnsiString Lstr = Test.LowerCase();
}

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Test = "ABCdef";
AnsiString Ustr = Test.UpperCase();
}

//类似vb中Trim 的去空格函数
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "     ABCDEF      ";
    AnsiString TLstr = Test.TrimLeft();
   AnsiString TRstr = Test.TrimRight();
AnsiString Tstr = Test.Trim();
}

//但是，这个处理不了全角的空格代码:
AnsiString __fastcall TForm1::TrimStr( AnsiString Tm , AnsiString LR )
{
    // LR … L:左除去   R:右除去   B:dou除去
    int len;
    // 左除去
    if ( LR == "L" || LR == "B" ){
        len = Tm.Length();
        while ( Tm.SubString(1,1) == " " || Tm.SubString(1,2) == "　"){
            // 半角除去
            if ( Tm.SubString(1,1) == " " ){
                Tm = Tm.SubString(2,len);
                len = Tm.Length();
            }
            // 全角除去
            else if ( Tm.SubString(1,2) == "　" ){
                Tm = Tm.SubString(3,len);
                len = Tm.Length();
            }
        }
    }
    // 右除去
    if ( LR == "R" || LR == "B" ){
        len = Tm.Length();
        while ( Tm.SubString(len,1) == " " || Tm.SubString(len-1,2) == "　" ){
            // 半角除去
            if ( Tm.SubString(len,1) == " " ){
                len = Tm.Length();
                Tm = Tm.SubString(1,len-1);
                len = Tm.Length();
            }
            // 全角除去
            else if ( Tm.SubString(len-1,2) == "　" ){
                len = Tm.Length();
                Tm = Tm.SubString(1,len-2);
                len = Tm.Length();
            }
        }
    }
    return Tm;
}
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Test = "　　拳脚　　";
    AnsiString Ret = TrimStr(Test,"B")
}

//相同字符重复输入
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString Soc = AnsiString::StringOfChar( '*' , 100 );
Edit1->Text=Soc ;//显示100个*

}

//字符串替换
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Str = "Borland C++ Builder is free";
    AnsiString From = "C++ Builder";
    AnsiString To = "Delphi";
    AnsiString Result;
    Result = StringReplace( Str, From, To, TReplaceFlags() <<
rfReplaceAll << rfIgnoreCase );
//<<后是参数，得到Borland Delphi is free
}

//全角变半角
    AnsiString Zen = "１２３４５６７８９０";
    int Len = Zen.Length();
    char buf[MAX_PATH];
    ZeroMemory( buf, sizeof( buf ) );
    LCMapString( GetUserDefaultLCID(), LCMAP_HALFWIDTH, Zen.c_str(), Len, buf, sizeof( buf ) );
    AnsiString Han = AnsiString( buf );
    Edit1->Text=Han;

//半角变全角
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    AnsiString Han = "1234567890";
    int Len = Han.Length();
    char buf[MAX_PATH];
    ZeroMemory( buf, sizeof( buf ) );
    LCMapString( GetUserDefaultLCID(), LCMAP_FULLWIDTH, Han.c_str(), Len, buf, sizeof( buf ) );
    AnsiString Zen = AnsiString( buf );
}