C#：LockBits 推出了一个巨大的红色 X
按照 Bob Powell 关于 LockBits 的教程，我将以下代码放入 C# 2010 Visual Studio Express 中：
System.Drawing.Imaging.BitmapData bmp =
BitmapImage
.LockBits(new Rectangle(0, 0, 800, 600),
System.Drawing.Imaging.ImageLockMode.ReadWrite,
MainGrid.PixelFormat)
unsafe
{
for (int y = 0; y < bmp.Height; y++)
{
byte* row = (byte*)bmp.Scan0 + (y * bmp.Stride);
for (int x = 0; x < bmp.Width; x++)
{
row[x * 4] = 255;
}
}
}
将位图数据推入图片框 (picturebox.Image = BitmapImage;) 后，出现的只是白色背景上的红色 x，带有红色边框。我做错了什么？
Following Bob Powell's tutorial on LockBits, I put the following code into C# 2010 Visual Studio Express:
System.Drawing.Imaging.BitmapData bmp =
BitmapImage
.LockBits(new Rectangle(0, 0, 800, 600),
System.Drawing.Imaging.ImageLockMode.ReadWrite,
MainGrid.PixelFormat)
unsafe
{
for (int y = 0; y < bmp.Height; y++)
{
byte* row = (byte*)bmp.Scan0 + (y * bmp.Stride);
for (int x = 0; x < bmp.Width; x++)
{
row[x * 4] = 255;
}
}
}
After pushing the Bitmap data into a picturebox (picturebox.Image = BitmapImage;) all that comes out is a red x over a white background, with a red border. What am I doing wrong?
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评论（1）
您是否忘记在最后调用
UnlockBits，如本文末尾所建议的：使用LockBits方法访问图像数据？Have you forgotten to call
UnlockBitsat the end, as suggested at the end of this article: Using the LockBits method to access image data?