大家都知道，在标准c++中有string和wstring，前者为多字节ANSI字串，后者为宽字节wide字串(UTF-16)。
在一些应用中常常需要在二者之间以及与UTF-8之间进行字串转换，这里提供一个自己写的类，用于之间的转换。
原理是利用windows的api：WideCharToMultiByte、MultiByteToWideChar。
这两个api的第一个参数就是代码页，其中CP_ACP代表ANSI CODE PAGE，而CP_UTF8自然代表UTF-8。
注：由于用到了windows api，所以只适用windows平台。
/**
* Author: ATHER Shu 2009.3.20
* StringUtil类:用于ANSI、UTF-16、UTF-8之间的字串转换
* 功能：
* 1.UTF-16转ANSI ws2s
* 2.ANSI转UTF-16 s2ws
* 3.UTF-16转UTF-8 ws2utf8
* 4.UTF-8转UTF-16 utf82ws
* http://www.asarea.me
* ATHER Shu(AS)
*/
#include <string>
#include <Windows.h>
using namespace std;
class StringUtil
{
public:
static string ws2s(const wstring& ws)
{
const wchar_t* _Source = ws.c_str();
size_t _Dsize = WideCharToMultiByte(CP_ACP, 0, _Source, -1, NULL, 0, NULL, NULL);
char *_Dest = new char[_Dsize];
WideCharToMultiByte(CP_ACP, 0, _Source, -1, _Dest, _Dsize, NULL, NULL);
string result = _Dest;
delete []_Dest;
return result;
}
static wstring s2ws(const string& s)
{
const char* _Source = s.c_str();
size_t _Dsize = MultiByteToWideChar(CP_ACP, 0, _Source, -1, NULL, 0);
wchar_t *_Dest = new wchar_t[_Dsize];
MultiByteToWideChar(CP_ACP, 0, _Source, -1, _Dest, _Dsize);
wstring result = _Dest;
delete []_Dest;
return result;
}
static string ws2utf8(const wstring& ws)
{
const wchar_t* _Source = ws.c_str();
size_t _Dsize = WideCharToMultiByte(CP_UTF8, 0, _Source, -1, NULL, 0, NULL, NULL);
char *_Dest = new char[_Dsize];
WideCharToMultiByte(CP_UTF8, 0, _Source, -1, _Dest, _Dsize, NULL, NULL);
string result = _Dest;
delete []_Dest;
return result;
}
static wstring utf82ws(const string& s)
{
const char* _Source = s.c_str();
size_t _Dsize = MultiByteToWideChar(CP_UTF8, 0, _Source, -1, NULL, 0);
wchar_t *_Dest = new wchar_t[_Dsize];
MultiByteToWideChar(CP_UTF8, 0, _Source, -1, _Dest, _Dsize);
wstring result = _Dest;
delete []_Dest;
return result;
}
};
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