C++Builder 常用String

关于AnsiSting的使用大全(1)

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Ansistring 转 char

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Test = "哈哈";

char *chr = Test.c_str();

}

char转Ansistring

代码:

#include <windef.h>

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString str = "Sample";

char chr[MAX_PATH];

strcpy( chr , str.c_str() );

}

ansistring转int

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Test = "123";

int i = StrToInt( Test );

}

int转ansistring

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

int i = 123;

AnsiString str = IntToStr( i );

}

ansisting转double

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Test = "123";

long double d = StrToFloat( Test );

}

double转ansistring

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

double d = 123.456;

AnsiString str = FloatToStr( d );

}

double转ansistring并四舍五入

代码:

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

代码:

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:

ansi转Tclor型（从现在开始AnsiSting简称ansi

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Test = "0x00FF8080";

TColor Col = StringToColor( Test );

}

Tclor转ansi

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

TColor Col = 0x00FF8080;

AnsiString str = ColorToString( Col );

}

ansi的一部分消除，哈哈，类似vb里的mid函数，不过是反的～

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

ansi的一部分插入

代码:

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

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Test = "ABCDEF";

AnsiString Npos = Test[3];//得到C

}

取得ansi里最后一个字符

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Test = "ABCDEF";

char *Lstr = Test.AnsiLastChar();//得到F

}

取出ansi字符，这才是vb的mid函数！

代码:

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

}

ansi的字母 是否相同比较

代码:

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。

}

代码:

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ansi中寻找字符

代码:

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ansi中找字符串，和上一个类似

代码:

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

代码:

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

代码:

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

代码:

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

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Test = "";

bool chk = Test.IsEmpty();

if (chk )

Edit1->Text="1";//返回1

}

全部便小写vs全部便大写

代码:

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

代码:

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 怎么办ni～

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

代码:

void __fastcall TForm1::Button1Click(TObject *Sender)

{

AnsiString Soc = AnsiString::StringOfChar( '*' , 100 );

Edit1->Text=Soc ;//显示100个*

}

关于AnsiSting的使用大全(2)

字符串替换

代码:

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

代码:

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

代码:

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 );

}

设置日期格式为YYYY-MM-DD

DateSeparator = '-';

ShortDateFormat = "yyyy-mm-dd";

让控件随窗口尺寸更改而更改(by jishiping)

用 ScaleBy(int M, int D); 函数就可以了。例如窗口放大到125％： ScaleBy(125, 100);