Re: MFC serialization of HICON

From:

=?Utf-8?B?UGF3ZWwgS296aWVsc2tp?= <PawelKozielski@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 7 Feb 2008 11:49:02 -0800

Message-ID:

<6CA6C76B-E062-4E80-98BA-0C35CE67D7A5@microsoft.com>

Mark,

my sincere apologies.
You are completely right, "serialize_ex.cpp" is not a part of MFC.
I just realize that it was implemented internally.

Following are overloads for HICON and HBITMAP (HBITMAP used by HICON
overload for mask and color bmps)

////////////////////////////////////////////////////////////////////////////////
// Archiving Bitmaps

CArchive& operator<<(CArchive &ar, const HBITMAP &hBitmap)
{
    Bitmap bm(hBitmap,NULL);

    // Get the class identifier for the PNG encoder.
    CLSID pngClsid;
    GetEncoderClsid(L"image/png", pngClsid);

    //The CStream object will contain the Bitmap data
    CStream bmStream(100*1000);
    bm.Save(&bmStream,&pngClsid);

    bmStream.Serialize(ar);

    return ar;
}

CArchive& operator>>(CArchive &ar, HBITMAP &hBitmap)
{
    CStream bmStream;
    bmStream.Serialize(ar);

    Bitmap bm(&bmStream);
    Status sResult = bm.GetLastStatus();
    if( sResult != Ok )
    {
        ASSERT(FALSE);
    }

    hBitmap = NULL;
    sResult = bm.GetHBITMAP(Color::Black,(HBITMAP*)&hBitmap);
    if( sResult != Ok )
    {
        ASSERT(FALSE);
    }

    return ar;
}

////////////////////////////////////////////////////////////////////////////////
// Archiving Icons

CArchive& operator<<(CArchive &ar, const HICON &hIcon)
{
    ICONINFO info;

    BOOL bResult = ::GetIconInfo(hIcon,&info);
    if( !bResult )
    {
        DWORD dwError = ::GetLastError();
        CString s;
        s.Format(_T("Error: %d\n"),dwError);
        ::OutputDebugString(s);

        ASSERT(FALSE);
    }

    ar << info.fIcon;
    ar << info.xHotspot;
    ar << info.yHotspot;
    ar << info.hbmMask;
    ar << info.hbmColor;

    return ar;
}

CArchive& operator>>(CArchive &ar, HICON &hIcon)
{
    ICONINFO info;
    ar >> info.fIcon;
    ar >> info.xHotspot;
    ar >> info.yHotspot;
    ar >> info.hbmMask;
    ar >> info.hbmColor;

    hIcon = ::CreateIconIndirect(&info);
    if( hIcon == NULL )
    {
        DWORD dwError = GetLastError();
        CString s;
        s.Format(_T("Error: %d\n"),dwError);
        ::OutputDebugString(s);

        ASSERT(FALSE);
    }

    ::DeleteObject(info.hbmMask);
    ::DeleteObject(info.hbmColor);

    return ar;
}

Storing seems to work but when loading, Bitmap bm(&bmStream) crashes.
Bitmap constructor is called in "GdiPlusBitmap.h"
(Bitmap::Bitmap(IN IStream *stream, IN BOOL useEmbeddedColorManagement) and
DllExports::GdipCreateBitmapFromStream(stream, &bitmap); throws but i can not
step in farther.

What makes me uneasy is that all of that code worked before i upgraded to VS
2008. I was using 2005 before.

Thank you again for looking into my issue.

Pawel Kozielski