int MultiByteToWideChar( 
 UINT CodePage,   // code page 
 DWORD dwFlags,   // character-type options 
 LPCSTR lpMultiByteStr, // string to map 
 int cbMultiByte,  // number of bytes in string 
 LPWSTR lpWideCharStr, // wide-character buffer 
 int cchWideChar  // size of buffer 
); 

  char* szStr = "测试字符串"; 
WCHAR wszClassName[256]; 
memset(wszClassName,0,sizeof(wszClassName)); 
MultiByteToWideChar(CP_ACP,0,szStr,strlen(szStr)+1,wszClassName, 
 sizeof(wszClassName)/sizeof(wszClassName[0])); 

  char* szStr = "测试字符串";  
CString str = CString(szStr); 
USES_CONVERSION; 
LPCWSTR wszClassName = new WCHAR[str.GetLength()+1]; 
wcscpy((LPTSTR)wszClassName,T2W((LPTSTR)str.GetBuffer(NULL))); 
str.ReleaseBuffer(); 

char* szStr = "测试字符串";  
CString str = CString(szStr); 
USES_CONVERSION; 
LPCWSTR wszClassName = A2CW(W2A(str)); 
str.ReleaseBuffer();