MFC数据类型转换

CString->int 

CString str("1234"); 

int i= _ttoi(str);

CString->const char*

const char* CXmlCtrl::cstoc(CString s)

{

int len = WideCharToMultiByte(CP_UTF8, 0, s, s.GetLength(),NULL, 0, NULL, NULL);

char * c = new char [len + 1];

len = WideCharToMultiByte(CP_UTF8, 0, s, s.GetLength(), c, len+ 1, NULL, NULL);

c[len] = 0;

return (const char*)c;

}

WCHAR*->char*

void CXmlCtrl::w2c(char *pcstr,const wchar_t *pwstr, size_tlen)

{

int nlength=wcslen(pwstr);

//获取转换后的长度

int nbytes = WideCharToMultiByte(0, 0, pwstr, nlength, NULL,0, NULL, NULL );

if(nbytes>len)   nbytes=len;

// 通过以上得到的结果，转换unicode 字符为ascii 字符

WideCharToMultiByte(0, 0, pwstr, nlength, pcstr, nbytes, NULL,NULL );

}