Base64Encode HGLOBAL from clipboard

Jeff <>
Wed, 11 Jun 2008 21:08:20 -0700 (PDT)
I am trying to base64 encode some binary data stored on the
clipboard. The resulting string will be stored in an XML file. The
data is a PNG image, and the string I get from ATL::Base64Encode seems
to be very wrong. The data on the clipboard seems to be fine, and I
believe that I am retrieving it correctly, but the string has several
invalid characters at the end ("=CD=FD=FD=FD=FD=AB=AB=AB=AB=AB=AB=AB=AB=FE=
=EE=FE"), and there are no
'=' characters. Here is the code:

hr = spDataObject->GetData( &formatEtc, &stgMedium );

if ( SUCCEEDED( hr ) )
    if ( stgMedium.hGlobal != NULL )
        BYTE *pImage = (LPBYTE)::GlobalLock( stgMedium.hGlobal ) );

        // this call works just fine, so the data appears to be valid
        std::fstream filestream( "D:\\image.png", std::ios::out |
                                                  std::ios::binary |
                                                  std::ios::app );
        filestream.write( reinterpret_cast<char *>( pImage ),
                          ::GlobalSize( stgMedium.hGlobal ) );

        if ( pImage )
            int iSize = Base64EncodeGetRequiredLength(
                ::GlobalSize( stgMedium.hGlobal ),

            char *szBase64Image = new char[ iSize ];

            if ( Base64Encode( pImage,
                               ::GlobalSize( stgMedium.hGlobal ),
                               ATL_BASE64_FLAG_NOPAD |
                               ATL_BASE64_FLAG_NOCRLF ) )
                // store szBase64Image in XML...

            delete [] szBase64Image;

        ::GlobalUnlock( stgMedium.hGlobal );

    ::ReleaseStgMedium( &stgMedium );

I have tried other methods for obtaining the BYTE array, including
CreateILockBytesOnHGlobal. I don't think that is the problem. I
don't have a lot of experience with the clipboard, and I have never
used ATL::Base64Encode before, so any help with what I am doing wrong
would be appreciated.

Thank you.


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