学步园

//把utf8转成unicode，再转成cstring   
void ConvertUTF8ToANSI(char* strUTF8,CString &strANSI)  //   
{   
    int nLen = ::MultiByteToWideChar(CP_UTF8,MB_ERR_INVALID_CHARS,(LPCTSTR)strUTF8,-1,NULL,0);  //返回需要的unicode长度   
    WCHAR * wszANSI = new WCHAR[nLen+1];   
    memset(wszANSI, 0, nLen * 2 + 2);   
    nLen = MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUTF8, -1, wszANSI, nLen);    //把utf8转成unicode   
       
    nLen = WideCharToMultiByte(CP_ACP, 0, wszANSI, -1, NULL, 0, NULL, NULL);        //得到要的ansi长度   
    char *szANSI=new char[nLen + 1];   
    memset(szANSI, 0, nLen + 1);   
    WideCharToMultiByte (CP_ACP, 0, wszANSI, -1, szANSI, nLen, NULL,NULL);          //把unicode转成ansi   
    strANSI = szANSI;   
    delete wszANSI;   
    delete szANSI;   
} 

//把utf8转成unicode，再转成cstring
void ConvertUTF8ToANSI(char* strUTF8,CString &strANSI)	//
{
	int nLen = ::MultiByteToWideChar(CP_UTF8,MB_ERR_INVALID_CHARS,(LPCTSTR)strUTF8,-1,NULL,0);	//返回需要的unicode长度
	WCHAR * wszANSI = new WCHAR[nLen+1];
	memset(wszANSI, 0, nLen * 2 + 2);
	nLen = MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUTF8, -1, wszANSI, nLen);	//把utf8转成unicode
	
	nLen = WideCharToMultiByte(CP_ACP, 0, wszANSI, -1, NULL, 0, NULL, NULL);		//得到要的ansi长度
	char *szANSI=new char[nLen + 1];
	memset(szANSI, 0, nLen + 1);
	WideCharToMultiByte (CP_ACP, 0, wszANSI, -1, szANSI, nLen, NULL,NULL);			//把unicode转成ansi
	strANSI = szANSI;
	delete wszANSI;
	delete szANSI;
}

void ConvertANSIToUTF8(CString &strANSI)   
{   
int nLen = ::MultiByteToWideChar(CP_ACP,MB_ERR_INVALID_CHARS,(LPCTSTR)strANSI,-1,NULL,0);   
unsigned short * wszUTF_8 = new unsigned short[nLen+1];   
memset(wszUTF_8, 0, nLen * 2 + 2);   
nLen = MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strANSI, -1, wszUTF_8, nLen);   
  
nLen = WideCharToMultiByte(CP_UTF8, 0, wszUTF_8, -1, NULL, 0, NULL, NULL);   
    char *szUTF8=new char[nLen + 1];   
    memset(szUTF8, 0, nLen + 1);   
    WideCharToMultiByte (CP_UTF8, 0, wszUTF_8, -1, szUTF8, nLen, NULL,NULL);   
strANSI = szUTF8;   
delete wszUTF_8;   
delete szUTF8;   
}

转载：http://blog.csdn.net/qinqijing_123/article/details/5994145