MFC读取utf8文件_mfc 读取utf8文件

void CtempDlg::ConvertUTF8ToANSI(CString 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 CtempDlg::OnBnClickedOk()
{
	// TODO: 在此添加控件通知处理程序代码
	
	CStdioFile mFile; 
	CFileException mExcept; 
	mFile.Open(_T("C:\\a.txt"), CFile::modeRead); 
	CString string,str;
	mFile.ReadString(string);
	ConvertUTF8ToANSI(string,str);
	mFile.Close(); 
 
	CDialogEx::OnOK();
}
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