'AfxMessageBox' : none of the 2 overloads could convert all the argument types

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Hi,
In a c++ project Iam using a HeaderFile localcpc.h.Inside that an error is arising
''AfxMessageBox' : none of the 2 overloads could convert all the argument types'

And the error is coming in the below part of code:

C#

BOOL SetLogNameAndPath(LPCWSTR FileNameandPath)
    {
        if(FileNameandPath)
        {
            FileHandle = CreateFile(FileNameandPath,GENERIC_READ | GENERIC_WRITE,FILE_SHARE_READ | FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
            if(FileHandle == INVALID_HANDLE_VALUE)
            {
                AfxMessageBox("Unable to create Log File");
                return FALSE;
            }
            SetFilePointer(FileHandle,0L,NULL,FILE_END);
        }
        else
        {
            ::AfxMessageBox(L"No FileName and path specified");
            return FALSE;
        }
        return TRUE;
    }

Can anybody suggest some solution?

Posted 14-Mar-13 0:23am

danil33

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Matthew Faithfull · Accepted Answer · 2013-03-14T00:33:00

If AfxMessageBox which is defined as

int AfxMessageBox( LPCTSTR lpszText, UINT nType = MB_OK, UINT nIDHelp = 0 );

cannot take your L"No FileName and path specified" LPCWSTR parameter and fill in the remaining two with defaults it's almost certainly because you're building a Multibyte build or have otherwise failed to predfine UNICODE and _UNICODE in your build meaning that the preprocessor resolved definition of AfxMessageBox is in fact

int AfxMessageBox( const char* lpszText, unsigned int nType = MB_OK, unsigned int nIDHelp = 0 );

which no longer matches the use of LPCWSTR resulting from the L"text" macro.

You need to either build a UNICODE build or use _T("No FileName and path specified") which will work in both UNICODE and non UNICODE builds.