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POReceiving an image dragged from Web Page to WPF window
 

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  1. POReceiving an image dragged from Web Page to WPF window
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    <p>I want my WPF application to be a drop target, and I want to be able to drag an image from any web page.</p> <p>When an image is dragged from a web page, apparently it is in the "DragImageBits" format, which can be deserialized to type <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/bb759778(v=vs.85).aspx">ShDragImage</a>. (See the bottom of the question for how I've defined it)</p> <p>How do I convert this to a WPF image?</p> <p>Here's my current attempt. (If anybody knows the correct way to do the desirialization, I'm all ears)</p> <pre><code> private void UserControl_Drop(object sender, System.Windows.DragEventArgs e) { string[] formats = data.GetFormats(); // DragImageBits if (formats.Contains("DragImageBits")) { MemoryStream imageStream = data.GetData("DragImageBits") as MemoryStream; // Now I'm deserializing this, the only way I know how imageStream.Seek(0, SeekOrigin.Begin); BinaryReader br = new BinaryReader(imageStream); ShDragImage shDragImage; shDragImage.sizeDragImage.cx = br.ReadInt32(); shDragImage.sizeDragImage.cy = br.ReadInt32(); shDragImage.ptOffset.x = br.ReadInt32(); shDragImage.ptOffset.y = br.ReadInt32(); shDragImage.hbmpDragImage = new IntPtr(br.ReadInt32()); shDragImage.crColorKey = br.ReadInt32(); var systemDrawingBitmap = System.Drawing.Bitmap.FromHbitmap(shDragImage.hbmpDragImage); </code></pre> <p>At this point I get an exception of type <code>System.Runtime.InteropServices.ExternalException</code>, with the message simply being <code>Generic GDI+ error</code>.</p> <p>Does anyone know what I should be doing?</p> <p><hr /> And here are the supporting class definitions. I copied them from <a href="http://blogs.msdn.com/adamroot/pages/shell-style-drag-and-drop-in-net-wpf-and-winforms.aspx">this blog entry</a>.</p> <pre><code>[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] public struct Win32Point { public int x; public int y; } [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] public struct Win32Size { public int cx; public int cy; } [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] public struct ShDragImage { public Win32Size sizeDragImage; public Win32Point ptOffset; public IntPtr hbmpDragImage; public int crColorKey; } </code></pre>
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