转 MFC中 GB2312、UTF-8、unicode 之间转换

//GB2312到UTF-8的转换
static int GB2312ToUtf8(const char* gb2312, char* utf8)
{
int len = MultiByteToWideChar(CP_ACP, 0, gb2312, -1, NULL, 0);
wchar_t* wstr = new wchar_t[len+1];
memset(wstr, 0, len+1);
MultiByteToWideChar(CP_ACP, 0, gb2312, -1, wstr, len);
len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);
WideCharToMultiByte(CP_UTF8, 0, wstr, -1, utf8, len, NULL, NULL);
if(wstr) delete[] wstr;
return len;
}


//UTF-8到GB2312的转换
static int Utf8ToGB2312(const char* utf8, char* gb2312)
{
int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
wchar_t* wstr = new wchar_t[len+1];
memset(wstr, 0, len+1);
MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len);
len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
WideCharToMultiByte(CP_ACP, 0, wstr, -1, gb2312, len, NULL, NULL);
if(wstr) delete[] wstr;
return len;
}


//GB2312到Unicode的转换
static int GB2312ToUnicode(const char* gb2312, char* unicode)
{
UINT nCodePage = 936; //GB2312
int len = MultiByteToWideChar(nCodePage, 0, gb2312, -1, NULL, 0);
wchar_t* wstr = new wchar_t[len+1];
memset(wstr, 0, len+1);
MultiByteToWideChar(nCodePage, 0, gb2312, -1, wstr, len);
len = len*sizeof(wchar_t);
memcpy(unicode, wstr, len);
if(wstr) delete[] wstr;
return len;
}


//Unicode到GB2312的转换
static int UnicodeToGB2312(const char* unicode, int size, char*gb2312)
{
UINT nCodePage = 936; //GB2312
wchar_t* wstr = new wchar_t[size/2+1];
memcpy(wstr, unicode, size);
int len = WideCharToMultiByte(nCodePage, 0, wstr, -1, NULL, 0, NULL, NULL);
WideCharToMultiByte(nCodePage, 0, wstr, -1, gb2312, len, NULL, NULL);
if(wstr) delete[] wstr;
return len;
}




//UTF-8到Unicode的转换
static int Utf8ToUnicode(const char* utf8, char*unicode)
{
int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
wchar_t* wstr = new wchar_t[len+1];
memset(wstr, 0, len+1);
MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len);
memcpy(unicode, wstr, len);
if(wstr) delete[] wstr;
return len;
}


//Unicode到UTF-8的转换
static int UnicodeToUtf8(const char* unicode, int size, char* utf8)
{
wchar_t* wstr = new wchar_t[size/2+1];
memcpy(wstr, unicode, size);
int len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);
WideCharToMultiByte(CP_UTF8, 0, wstr, -1, utf8, len, NULL, NULL);
if(wstr) delete[] wstr;
return len;

}

转自http://blog.csdn.net/seven407/article/details/7712823