c# - GDI+ 错误仅发生在 Windows XP 上

Question

我有一些 c# 代码在 Vista 和 Windows 7 上运行良好，但在 Windows XP(安装了 Service Pack 3)上抛出 GDI+ 错误。

在 XP 上抛出错误

System.Runtime.INteropServices.ExternalException(0x80004005): A generic error occured in GDI+ at System.Drawing.Graphics.CheckErrorStatus(Int32Status) at System.Drawing.Graphics.DrawImage(Image image, Int32 x, Int32 y) At System.Drawing.Graphics.DrawImageUnscaled(Image image, Int32 x,Int 32 y) at mysolution.Core.ImageTools.ConvertToBitonal(Bitmap orginal, Int32 threshold)

这一行的代码中断:

using (var g = Graphics.FromImage(source))
   {
      g.DrawImageUnscaled(original, 0, 0); // Error Is Thrown Here
   }

WpFAppTestingConvertToBitonalCS

....

下面是我调用的完整函数。

    public static Bitmap ConvertToBitonal(Bitmap original, int threshold)
    {
        Bitmap source;

        // If original bitmap is not already in 32 BPP, ARGB format, then convert
        if (original.PixelFormat != PixelFormat.Format32bppArgb)
        {
            source = new Bitmap(original.Width, original.Height, PixelFormat.Format32bppArgb);
            source.SetResolution(original.HorizontalResolution, original.VerticalResolution);

            using (var g = Graphics.FromImage(source))
            {
                g.DrawImageUnscaled(original, 0, 0);
            }
        }
        else
        {
            source = original;
        }

        // Lock source bitmap in memory
        var sourceData = source.LockBits(new Rectangle(0, 0, source.Width, source.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);

        // Copy image data to binary array
        var imageSize = sourceData.Stride * sourceData.Height;
        var sourceBuffer = new byte[imageSize];
        Marshal.Copy(sourceData.Scan0, sourceBuffer, 0, imageSize);

        // Unlock source bitmap
        source.UnlockBits(sourceData);

        // Create destination bitmap
        var destination = new Bitmap(source.Width, source.Height, PixelFormat.Format1bppIndexed);
        destination.SetResolution(original.HorizontalResolution, original.VerticalResolution);

        // Lock destination bitmap in memory
        var destinationData = destination.LockBits(new Rectangle(0, 0, destination.Width, destination.Height), ImageLockMode.WriteOnly, PixelFormat.Format1bppIndexed);

        // Create destination buffer
        imageSize = destinationData.Stride * destinationData.Height;
        var destinationBuffer = new byte[imageSize];

        var sourceIndex = 0;
        var destinationIndex = 0;
        var pixelTotal = 0;
        byte destinationValue = 0;
        var pixelValue = 128;
        var height = source.Height;
        var width = source.Width;

        // Iterate lines
        for (var y = 0; y < height; y++)
        {
            sourceIndex = y * sourceData.Stride;
            destinationIndex = y * destinationData.Stride;
            destinationValue = 0;
            pixelValue = 128;

            // Iterate pixels
            for (var x = 0; x < width; x++)
            {
                // Compute pixel brightness (i.e. total of Red, Green, and Blue values) - Thanks murx
                //                           B                             G                              R
                pixelTotal = sourceBuffer[sourceIndex] + sourceBuffer[sourceIndex + 1] + sourceBuffer[sourceIndex + 2];
                if (pixelTotal > threshold)
                {
                    destinationValue += (byte)pixelValue;
                }
                if (pixelValue == 1)
                {
                    destinationBuffer[destinationIndex] = destinationValue;
                    destinationIndex++;
                    destinationValue = 0;
                    pixelValue = 128;
                }
                else
                {
                    pixelValue >>= 1;
                }
                sourceIndex += 4;
            }

            if (pixelValue != 128)
            {
                destinationBuffer[destinationIndex] = destinationValue;
            }
        }

        // Copy binary image data to destination bitmap
        Marshal.Copy(destinationBuffer, 0, destinationData.Scan0, imageSize);

        // Unlock destination bitmap
        destination.UnlockBits(destinationData);

        // Dispose of source if not originally supplied bitmap
        if (source != original)
        {
            source.Dispose();
        }

        // Return
        return destination;
    }

Answer 1

我讨厌 GDI+ 异常处理，它触发的唯一错误是 GDI+ 中发生一般错误，试试这个

Bitmap source = new Bitmap(0, 0);  
using (Graphics g = Graphics.FromImage(source))  
{   g.Clear(Color.White); 
    g.Graphics.DrawImageUnscaled(your original source,0,0);  
}