Convert from System.Drawing.Icon to System.Media.ImageSource and vice versa

最新推荐文章于 2024-11-03 10:06:33 发布

原创最新推荐文章于 2024-11-03 10:06:33 发布 · 220 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#wpf

WPF 专栏收录该内容

46 篇文章

订阅专栏

本文深入探讨了在WinForm与WPF之间转换图像源的方法，包括从System.Drawing.Icon到System.Media.ImageSource的转换，以及反向转换。详细介绍了使用DllImport和MemoryStream进行图像转换的技术实现，并提供了关键代码片段。文章还提到了图像源到Bitmap的逆转换方法，确保了转换过程的全面性和实用性。

with the transition from Winform to WPF, there is rising/upsurging demand to convert from System.Drawing.Icon to System.Media.ImageSource and vice versa (you cannot rule out the possibility to host new tech object in old ones)

Below shows how you can do to convert from System.Drwing.Icon to ImageSource.

internal static class IconUtilities
  {
    // you may refer to this page for details on how to convert from System.Drawing.Icon to System.Media.ImageSource
    // http://stackoverflow.com/questions/1127647/convert-system-drawing-icon-to-system-media-imagesource
    [DllImport("gdi32.dll", SetLastError = true)]
    private static extern bool DeleteObject(IntPtr hObject);

    public static ImageSource ToImageSource(this Icon icon)
    {
      Bitmap bitmap = icon.ToBitmap();
      IntPtr hBitmap = bitmap.GetHbitmap();

      ImageSource wpfBitmap = Imaging.CreateBitmapSourceFromHBitmap(
          hBitmap,
          IntPtr.Zero,
          Int32Rect.Empty,
          BitmapSizeOptions.FromEmptyOptions());

      if (!DeleteObject(hBitmap))
      {
        throw new Win32Exception();
      }

      return wpfBitmap;
    }
  }

note: the referenced material, contains more solution to do the conversion:

Convert System.Drawing.Icon to System.Media.ImageSource

withou losing fairness, here is the code that uses the MemoryStream,

public static ImageSource ToImageSourceWithMemoryStream(this Icon icon)
    {
      using (System.IO.MemoryStream iconstream = new System.IO.MemoryStream())
      {
        icon.Save(iconstream);
        iconstream.Seek(0, System.IO.SeekOrigin.Begin);
        return System.Windows.Media.Imaging.BitmapFrame.Create(iconstream);
      }

    }

And you may wonder how do we do the reverse, that is from System.Windows.Media.Imaging.ImageSource or one of its descendant class, that is called System.Windows.Media.Imaging.BitmapSource to System.Drawing.Bitmap...

Here is one code, however, please be noted, the code has not been fully testified, it may work as expected or it may not.

internal static class BitmapSourceUtilities
  {

    public static Bitmap ToBitmap(this BitmapSource imageSource, double width, double height)
    {

      double newwidthratio = width / (double)imageSource.PixelWidth;
      // have no idea why the calculation is as such
      double newheightratio = width * (double)imageSource.PixelHeight / (double)imageSource.PixelHeight / (double) imageSource.PixelWidth;

      BitmapSource transformedBitmapSource = new TransformedBitmap(
        imageSource,
        new ScaleTransform(newwidthratio, newheightratio)
        );
      int bitmapwidth = transformedBitmapSource.PixelWidth;
      int bitmapheight = transformedBitmapSource.PixelHeight;
      int stride = bitmapwidth * (transformedBitmapSource.Format.BitsPerPixel + 7) / 8);

      byte[] bits = new byte[bitmapheight * stride];


      transformedBitmapSource.CopyPixels(bits, stride, 0);

      // you may want to put the following code that has the unsafe compiler turned on....
      unsafe
      {
        fixed (byte* pBits = bits)
        {
          IntPtr ptr = new IntPtr(pBits);
          System.Drawing.Bitmap bitmap = new Bitmap(
            bitmapwidth, 
            bitmapheight,
            stride, 
            System.Drawing.Imaging.PixelFormat.Format32bppArgb,
            ptr);
          return bitmap;
        }
      }
    }
  }

another note is that : The above code references the BitmapSource-Bitmap interop. you may find some boilerplat code that do grayscale and others..

note: synonym of rising..

climbing

Synonyms:

advancing, ascending, emerging, going up,growing, increasing, mounting, skyrocketing,soaring, spiraling, surging, upsurging