ansistring 基本用法 博客分类： BCB bcbansistring

//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 );

}

 

文章出处：http://blog.sina.com.cn/s/blog_63ac730e0100ky27.html