GetLastError() in a MessageBox()?

Hi,
can you tell me how to display the GetLastError() in a MessageBox()?
Thanks!

Use FormatMessage() function to get error code string...

Thanks,

See also this FAQ
How to get the reason for a failure of a SDK function?.

GetLastError() return the calling thread's last-error code.
Error codes are 32-bit values so to display the error code you will have to construct a string representation of the error code, something like:

Code:

---

std::ostringstream ss;
DWORD dwLastError = ::GetLastError();
ss << dwLastError ;

YourMessageBox( ss.str(), ss.str().c_str() );

---

As indicated, You can obtain error message strings for system error codes using FormatMessage(), something like:

Code:

---

int main()
{
    void* lpBuffer;

    FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
                      NULL,
                      ::GetLastError(),
                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
                      (LPTSTR) &lpBuffer,
                      0,
                      NULL );

    MessageBox( NULL, (LPCTSTR)lpBuffer, __T("LastRrror"), MB_OK );
    LocalFree( lpBuffer );

    return 0;
}

---

Regards
Doron Moraz