Collectives™ on Stack Overflow

Find centralized, trusted content and collaborate around the technologies you use most.

Teams

Q&A for work

Connect and share knowledge within a single location that is structured and easy to search.

I have 3D WPF visual that I want to pass into an Excel cell (via clipboard buffer).

With "normal" BMP images it works but I do not know how to convert a RenderTargetBitmap .

My code looks like this:

System.Windows.Media.Imaging.RenderTargetBitmap renderTarget = myParent.GetViewPortAsImage(DiagramSizeX, DiagramSizeY);
System.Windows.Controls.Image myImage = new System.Windows.Controls.Image();
myImage.Source = renderTarget;
System.Drawing.Bitmap pg = new System.Drawing.Bitmap(DiagramSizeX, DiagramSizeY);
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pg);
gr.DrawImage(myImage, 0, 0);
System.Windows.Forms.Clipboard.SetDataObject(pg, true);
sheet.Paste(range);
My problem is that gr.DrawImage does not accept a System.Windows.Controls.Image or a System.Windows.Media.Imaging.RenderTargetBitmap; only a System.Drawing.Image.
How do I convert the Controls.Image.Imaging.RenderTargetBitmap into an Image, or are there any easier ways?
You can copy the pixels from the RenderTargetBitmap directly into the pixel buffer of a new Bitmap. Note that I've assumed that your RenderTargetBitmap uses PixelFormats.Pbrga32, as use of any other pixel format will throw an exception from the constructor of RenderTargetBitmap.
var bitmap = new Bitmap(renderTarget.PixelWidth, renderTarget.PixelHeight,
    PixelFormat.Format32bppPArgb);
var bitmapData = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size),
    ImageLockMode.WriteOnly, bitmap.PixelFormat);
renderTarget.CopyPixels(Int32Rect.Empty, bitmapData.Scan0,
    bitmapData.Stride*bitmapData.Height, bitmapData.Stride);
bitmap.UnlockBits(bitmapData);
This was the solution I came up with
System.Windows.Media.Imaging.RenderTargetBitmap renderTarget = myParent.GetViewPortAsImage(DiagramSizeX, DiagramSizeY);
System.Windows.Media.Imaging.BitmapEncoder encoder = new System.Windows.Media.Imaging.PngBitmapEncoder();
MemoryStream myStream = new MemoryStream();
encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(renderTarget));
encoder.Save(myStream);
System.Drawing.Bitmap pg = new System.Drawing.Bitmap(DiagramSizeX, DiagramSizeY);
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pg);
// Background
gr.FillRectangle(new System.Drawing.SolidBrush(BKGC), 0, 0, DiagramSizeX, DiagramSizeY);
gr.DrawImage(System.Drawing.Bitmap.FromStream(myStream), 0, 0);
System.Windows.Forms.Clipboard.SetDataObject(pg, true);
sheet.Paste(range);
Maybe I don't understand the question right, but you want to copy a RenderTargetBitmap to the clipboard, couldn't you just call SetImage ?:
    Dim iRT As RenderTargetBitmap = makeImage() //this is what you do to get the rendertargetbitmap
    If iRT Is Nothing Then Exit Sub
    Clipboard.SetImage(iRT)
        
Thanks for contributing an answer to Stack Overflow!
Please be sure to answer the question. Provide details and share your research!
But avoid …
Asking for help, clarification, or responding to other answers.
Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.