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多字节、Unicode和UTF8字符串的互换

实现过程

#include "stdafx.h"

#include <windows.h>

#include <iostream>

#include <string>

using namespace std;

string Unicode2Ascii(wstring wstrsrc);

wstring Ascii2Unicode(string astrsrc);

string Unicode2UTF8(wstring wstrsrc);

wstring UTF82Unicode(string utf8strsrc);

int main(int argc, char* argv[])

{

char szText[] = "这是一个ANSI转化为UTF8的例子!\r\n";

wstring strUnicode;

string strAnsi, strUTF8;

strAnsi = szText;

strUnicode = Ascii2Unicode(strAnsi);

strUTF8 = Unicode2UTF8(strUnicode);

cout << strUTF8 << endl;

strUnicode = UTF82Unicode(strUTF8);

strAnsi = Unicode2Ascii(strUnicode);

cout << strAnsi << endl;

return 0;

}

string Unicode2Ascii(wstring wstrsrc)

{

int nLength = ::WideCharToMultiByte(CP_OEMCP, 0, wstrsrc.c_str(), -1, NULL, 0, NULL, NULL);

if(nLength <= 0) return string("");

char *szbuffer = new char[nLength + 2];

::WideCharToMultiByte(CP_OEMCP, 0, wstrsrc.c_str(), -1, szbuffer, nLength, NULL, NULL);

string strnew = szbuffer;

delete [] szbuffer;

return strnew;

}

wstring Ascii2Unicode(string astrsrc)

{

int nLength = ::MultiByteToWideChar(CP_ACP, 0, astrsrc.c_str(), -1, NULL, 0);

if(nLength <= 0) return wstring(L"");

wchar_t *szbuffer = new wchar_t[nLength + 2];

::MultiByteToWideChar(CP_ACP, 0, astrsrc.c_str(), -1, szbuffer, nLength);

wstring strnew = szbuffer;

delete [] szbuffer;

return strnew;

}

string Unicode2UTF8(wstring wstrsrc)

{

int nLength = ::WideCharToMultiByte(CP_UTF8, 0, wstrsrc.c_str(), -1, NULL, 0, NULL, NULL);

if(nLength <= 0) return string("");

char *szbuffer = new char[nLength + 2];

::WideCharToMultiByte(CP_UTF8, 0, wstrsrc.c_str(), -1, szbuffer, nLength, NULL, NULL);

string strnew = szbuffer;

delete [] szbuffer;

return strnew;

}

wstring UTF82Unicode(string utf8strsrc)

{

int nLength = ::MultiByteToWideChar(CP_UTF8, 0, utf8strsrc.c_str(), -1, NULL, 0);

if(nLength <= 0) return wstring(L"");

wchar_t *szbuffer = new wchar_t[nLength + 2];

::MultiByteToWideChar(CP_UTF8, 0, utf8strsrc.c_str(), -1, szbuffer, nLength);

wstring strnew = szbuffer;

delete [] szbuffer;

return strnew;

}

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