获取 GetLastError 文本信息

DWORD derr = GetLastError(); 
derr = derr; 
LPVOID lpMsgBuf; 
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(), 0, // Default language (LPTSTR) &lpMsgBuf, 0, NULL ); // Process any inserts in lpMsgBuf.

// ... 
// Display the string. 
AfxMessageBox((LPCTSTR)lpMsgBuf);