C# Windows Mobile 利用Com 透明图片绘制

//扩展Graphics 

public static class GraphicsExtend
    {

       public enum PixelFormatID : int
       {
           PixelFormatIndexed = 0x00010000,  // Indexes into a palette
           PixelFormatGDI = 0x00020000,      // Is a GDI-supported format
           PixelFormatAlpha = 0x00040000,    // Has an alpha component
           PixelFormatPAlpha = 0x00080000,   // Pre-multiplied alpha
           PixelFormatExtended = 0x00100000, // Extended color 16 bits/channel
           PixelFormatCanonical = 0x00200000,
           PixelFormatUndefined = 0,
           PixelFormatDontCare = 0,
           PixelFormat1bppIndexed = (1 | (1 << 8) | PixelFormatIndexed | PixelFormatGDI),
           PixelFormat4bppIndexed = (2 | (4 << 8) | PixelFormatIndexed | PixelFormatGDI),
           PixelFormat8bppIndexed = (3 | (8 << 8) | PixelFormatIndexed | PixelFormatGDI),
           PixelFormat16bppRGB555 = (5 | (16 << 8) | PixelFormatGDI),
           PixelFormat16bppRGB565 = (6 | (16 << 8) | PixelFormatGDI),
           PixelFormat16bppARGB1555 = (7 | (16 << 8) | PixelFormatAlpha | PixelFormatGDI),
           PixelFormat24bppRGB = (8 | (24 << 8) | PixelFormatGDI),
           PixelFormat32bppRGB = (9 | (32 << 8) | PixelFormatGDI),
           PixelFormat32bppARGB = (10 | (32 << 8) | PixelFormatAlpha | PixelFormatGDI | PixelFormatCanonical),
           PixelFormat32bppPARGB = (11 | (32 << 8) | PixelFormatAlpha | PixelFormatPAlpha | PixelFormatGDI),
           PixelFormat48bppRGB = (12 | (48 << 8) | PixelFormatExtended),
           PixelFormat64bppARGB = (13 | (64 << 8) | PixelFormatAlpha | PixelFormatCanonical | PixelFormatExtended),
           PixelFormat64bppPARGB = (14 | (64 << 8) | PixelFormatAlpha | PixelFormatPAlpha | PixelFormatExtended),
           PixelFormatMax = 15
       }

       // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
       public enum BufferDisposalFlag : int
       {
           BufferDisposalFlagNone,
           BufferDisposalFlagGlobalFree,
           BufferDisposalFlagCoTaskMemFree,
           BufferDisposalFlagUnmapView
       }

       // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
       public enum InterpolationHint : int
       {
           InterpolationHintDefault,
           InterpolationHintNearestNeighbor,
           InterpolationHintBilinear,
           InterpolationHintAveraging,
           InterpolationHintBicubic
       }

       // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
       public struct ImageInfo
       {
           // I am being lazy here, I don't care at this point about the RawDataFormat GUID
           public uint GuidPart1;
           public uint GuidPart2;
           public uint GuidPart3;
           public uint GuidPart4;
           public PixelFormatID pixelFormat;
           public uint Width;
           public uint Height;
           public uint TileWidth;
           public uint TileHeight;
           public double Xdpi;
           public double Ydpi;
           public uint Flags;
       }

       // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
       [ComImport, Guid("327ABDA7-072B-11D3-9D7B-0000F81EF32E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
       [ComVisible(true)]
       public interface IImagingFactory
       {
           uint CreateImageFromStream(); // This is a place holder
           uint CreateImageFromFile(string filename, out IImage image);
           // We need the MarshalAs attribute here to keep COM interop from sending the buffer down as a Safe Array.
           uint CreateImageFromBuffer([MarshalAs(UnmanagedType.LPArray)] byte[] buffer, uint size, BufferDisposalFlag disposalFlag, out IImage image);
           uint CreateNewBitmap();            // This is a place holder
           uint CreateBitmapFromImage();      // This is a place holder
           uint CreateBitmapFromBuffer();     // This is a place holder
           uint CreateImageDecoder();         // This is a place holder
           uint CreateImageEncoderToStream(); // This is a place holder
           uint CreateImageEncoderToFile();   // This is a place holder
           uint GetInstalledDecoders();       // This is a place holder
           uint GetInstalledEncoders();       // This is a place holder
           uint InstallImageCodec();          // This is a place holder
           uint UninstallImageCodec();        // This is a place holder
       }

       // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
       [ComImport, Guid("327ABDA9-072B-11D3-9D7B-0000F81EF32E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
       [ComVisible(true)]
       public interface IImage
       {
           uint GetPhysicalDimension(out Size size);
           uint GetImageInfo(out ImageInfo info);
           uint SetImageFlags(uint flags);
           // "Correct" declaration: uint Draw(IntPtr hdc, ref Rectangle dstRect, ref Rectangle srcRect);
           uint Draw(IntPtr hdc, ref Rectangle dstRect, IntPtr NULL);
      
           uint PushIntoSink(); // This is a place holder
           uint GetThumbnail(uint thumbWidth, uint thumbHeight, out IImage thumbImage);
       }

     

    }

 

 

 

 

运用：

 GraphicsExtend.IImage img;

  GraphicsExtend.IImagingFactory factory=(GraphicsExtend.IImagingFactory)Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("327ABDA8-072B-11D3-9D7B-0000F81EF32E")));

 

 

 

  private void MainPanel_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawImage(map, rtlDes, rtlSrc, GraphicsUnit.Pixel);
            factory.CreateImageFromFile(DALUtility.AppPath + @"/Pic/" + "Test.png", out img);
            IntPtr dstHDC = e.Graphics.GetHdc();

           注：此矩形区域非 Winform 区域 而是：X,Y,top,left
            Rectangle rect = new Rectangle(47, 150,150+47,25+150);
            img.Draw(dstHDC, ref rect, IntPtr.Zero);
            e.Graphics.ReleaseHdc(dstHDC);
         
        }