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  1. #1
    Join Date
    Dec 2012

    Question Gifdecoder,BitmapSource and System.Windows.Controls::Image in mfc

    first of all sorry for my bad english.
    i need make a CBitmap or a streamdata from a System.Windows.Controls::Image(rendered out put)in a SDI mfc application (supporting \clr).
    here is my codes:
    using namespace System;
    using namespace System::IO;
    using namespace System::Collections::Generic;
    using namespace System::Windows;
    using namespace System::Windows::Controls;
    using namespace System::Windows::Media;
    using namespace System::Windows::Media::Imaging;
    using namespace System::Threading;
    using namespace System::Security;
    bool CGifdecoder::Decoder()  
    UINT Stride;
    unsigned short *res;
    unsigned short Buff[ROW * COLUMN];
    BitmapSource^ bitmapSource ;
    String ^ str = gcnew String(Files[m_Current].Filepath);
    // Open a Stream and decode a GIF image
    Stream^ imageStreamSource = gcnew FileStream(str, FileMode::Open, FileAccess::Read, FileShare::Read);
    GifBitmapDecoder^ decoder = gcnew GifBitmapDecoder(imageStreamSource, BitmapCreateOptions::PreservePixelFormat, BitmapCacheOption::Default);              
    GifInfo[m_Current].Frames =  decoder->Frames->Count;
     for(int i = 0;i < GifInfo[m_Current].Frames;i++){
    bitmapSource = decoder->Frames[i];
    bpp =  bitmapSource->Format.BitsPerPixel;
    Stride = (UINT)(bitmapSource->PixelWidth*(bitmapSource->Format.BitsPerPixel / 8) + 3) & (~3);//bitmapSource->PixelWidth * ((bitmapSource->Format.BitsPerPixel + 7) / 8);
    res = new unsigned short[bitmapSource->PixelHeight*bitmapSource->PixelWidth];
    			        IntPtr intptr = IntPtr(res); 
                 ,intptr,Stride*bitmapSource->PixelHeight, Stride);
    for(long j = 0;j<bitmapSource->PixelHeight*bitmapSource->PixelWidth;j++)
    //here i got unrendered codes from bitmapSource
    delete res;
    by this codes i can read datastream from bitmapSource but in this way somthing goes wrong in most of GIF animations.
    after debug i found out i need 3 more things too decode a gif animation - (x,y) position and size of each frame and disposal method for each one - finally i just found a way to draw true images on a form window by this codes:
    System::Windows::Window^ mainWindow;
    mainWindow = gcnew System::Windows::Window();
                   mainWindow->Title = "GIF Imaging Sample";
                   //ScrollViewer^ mySV = gcnew ScrollViewer();
    array<System::Byte>^ pixels = gcnew array<System::Byte>(bitmapSource->PixelHeight * Stride);
    bitmapSource = decoder->Frames[0];
    Image^ myImage = gcnew Image();
    myImage->Source = bitmapSource;
    myImage->Stretch = Stretch::None;
    myImage->Margin = System::Windows::Thickness(0);
    StackPanel^ myStackPanel = gcnew StackPanel();
    myStackPanel->Orientation = Orientation::Vertical;
    myStackPanel->VerticalAlignment = VerticalAlignment::Stretch;
    myStackPanel->HorizontalAlignment = HorizontalAlignment::Stretch;
    // mySV->Content = myStackPanel;
    mainWindow->Content = myStackPanel;//mySV;
    mainWindow->Width = bitmapSource->PixelHeight;
    mainWindow->Height = bitmapSource->PixelHeight;
    //mainWindow->ResizeMode = System::Windows::ResizeMode::NoResize;
    when i change
    bitmapSource = decoder->Frames[0];
    bitmapSource = decoder->Frames[1];
    frame[1] has drawn perfectly on window(i think some how Image class takes care about - (x,y) position and size of each frame and disposal method for each one ),so im wonder if how can i make a CBitmap or a data stream from System.Windows.Controls::Image class to use in mfc app.
    best regards.

  2. #2
    Join Date
    Jun 2010

    Re: Gifdecoder,BitmapSource and System.Windows.Controls::Image in mfc

    You appear to do a lot of bit shuffling yourself, so I see the need to ask: If this is an MFC app anyway and your goal is to get a CBitmap out of a GIF image, then why are you using all that rather WPF-oriented stuff from the .NET framework library in the first place? The System::Drawing::Bitmap class is a wrapper for a GDI+ bitmap object, so it may dramatically simplify what you're trying to do here.

    You wouldn't even need to create the file stream yourself: You can directly construct a Bitmap object by just passing the image file name to the respective contructor overload. The class has member functions to obtain a HBITMAP for the image which you then can simply pass to CBitmap::FromHandle(). For a more low-level access you may also get hands on the actual bitmap representation in memory, in case that's even needed in your scenario. I have never used it with multi-frame images myself, but it has a SelectActiveFrame() method that's obviously meant to support such a scenario.

    Finally, I ask myself why there shouldn't be something in MFC (my MFC and Win32 is rather rusty at the time though) or the GDI/GDI+ APIs that may allow you to eliminate the need for .NET code altogether. GDI+ looks like a really good candidate. Well, at least CBitmap itselft seems to not support direct loading of images (even less muli-frame images).

    You did use code tags but the weird and almost non-existent indentation still makes your code quite hard to read. However, the display of HTML entities instead of characters like > probably isn't your fault; I suspect that to be a glitch of the forum software. At least I've already seen something like that since the recent forum software update, and, IIRC, a simple workaround fix is to click Edit on your post and then just re-submit it without actually having edited anything.
    Last edited by Eri523; December 29th, 2012 at 07:39 AM.
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