【转载】IImagingFactory COM组件托管代码封装

public class IImaging
    {
        #region stałe i struktury
        public enum PixelFormatID : int
        {
            PixelFormatIndexed = 0x00010000,
            PixelFormatGDI = 0x00020000,
            PixelFormatAlpha = 0x00040000,
            PixelFormatPAlpha = 0x00080000,
            PixelFormatExtended = 0x00100000,
            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
        }

        public enum BufferDisposalFlag : int
        {
            BufferDisposalFlagNone,
            BufferDisposalFlagGlobalFree,
            BufferDisposalFlagCoTaskMemFree,
            BufferDisposalFlagUnmapView
        }

        public enum InterpolationHint : int
        {
            InterpolationHintDefault,
            InterpolationHintNearestNeighbor,
            InterpolationHintBilinear,
            InterpolationHintAveraging,
            InterpolationHintBicubic
        }

        public struct BitmapData
        {
            public uint Width;
            public uint Height;
            public int Stride;
            public PixelFormatID PixelFormat;
            public IntPtr Scan0;
            public IntPtr Reserved;
        }

        public struct ImageInfo
        {
            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;
        }

        #endregion

        #region interfejsy

        [ComImport, Guid("327ABDA7-072B-11D3-9D7B-0000F81EF32E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        [ComVisible(true)]
        public interface IImagingFactory
        {
            uint CreateImageFromStream(IStream stream, out IImage image);
            uint CreateImageFromFile(string filename, out IImage image);
            uint CreateImageFromBuffer([MarshalAs(UnmanagedType.LPArray)] byte[] buffer, uint size, BufferDisposalFlag disposalFlag, out IImage image);
            uint CreateNewBitmap(uint width, uint height, PixelFormatID pixelFormat, out IBitmapImage bitmap);
            uint CreateBitmapFromImage(IImage image, uint width, uint height, PixelFormatID pixelFormat, InterpolationHint hints, out IBitmapImage bitmap);
            uint CreateBitmapFromBuffer(BitmapData bitmapData, out IBitmapImage bitmap);
            uint CreateImageDecoder();    // pominięte
            uint CreateImageEncoderToStream();    // pominięte
            uint CreateImageEncoderToFile();    // pominięte
            uint GetInstalledDecoders();    // pominięte
            uint GetInstalledEncoders();    // pominięte
            uint InstallImageCodec();    // pominięte
            uint UninstallImageCodec();    // pominięte
        }

        [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);
            uint Draw(IntPtr hdc, ref Rectangle dstRect, IntPtr srcRect);
            uint PushIntoSink();    // pominięte
            uint GetThumbnail(uint thumbWidth, uint thumbHeight, out IImage thumbImage);
        }

        [ComImport, Guid("327ABDAA-072B-11D3-9D7B-0000F81EF32E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        [ComVisible(true)]
        public interface IBitmapImage
        {
            uint GetSize(out Size size);
            uint GetPixelFormatID(out PixelFormatID pixelFormat);
            uint LockBits(ref Rectangle rect, uint flags, PixelFormatID pixelFormat, out BitmapData lockedBitmapData);
            uint UnlockBits(ref BitmapData lockedBitmapData);
            uint GetPalette();    // pominięte
            uint SetPalette();    // pominięte
        }

        [ComImport, Guid("0000000c-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        [ComVisible(true)]
        public interface IStream
        {
            void Read([Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] byte[] pv, int cb, IntPtr pcbRead);
            void Write([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] byte[] pv, int cb, IntPtr pcbWritten);
            void Seek(long dlibMove, int dwOrigin, IntPtr plibNewPosition);
            void SetSize(long libNewSize);
            void CopyTo(IStream pstm, long cb, IntPtr pcbRead, IntPtr pcbWritten);
            void Commit(int grfCommitFlags);
            void Revert();
            void LockRegion(long libOffset, long cb, int dwLockType);
            void UnlockRegion(long libOffset, long cb, int dwLockType);
            void Stat();    // pominięte
            void Clone(out IStream ppstm);
        }

        #endregion

        #region metody

        public static IImagingFactory CreateFactory()
        {
            return (IImagingFactory)Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("327ABDA8-072B-11D3-9D7B-0000F81EF32E")));
        }

        #endregion
    }

To check that You're using it well I'm also providing an example of how to paint a PNG onto a pictureBox control during its OnPaint event:

private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
    Graphics g = e.Graphics;
    IntPtr hdc = g.GetHdc();

    IImaging.IImagingFactory factory = IImaging.CreateFactory();
    IImaging.IImage image;
    factory.CreateImageFromFile(@"\Storage Card\test.png", out image);
    Rectangle rect = new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height);
    image.Draw(hdc, ref rect, IntPtr.Zero); 
    g.ReleaseHdc(hdc);
}

 

转载于:https://www.cnblogs.com/IamEasy_Man/archive/2010/01/07/1641011.html