如何将位图图像转换为IntPtr的在C#中? [英] How to convert a Bitmap Image to IntPtr in C#?
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问题描述
我从一个例子,我看到这个做,它从来不浪费任何错误,但图像显示为灰色。
I made this from an example i saw, it never threw any error, but the image is displayed as grey.
有没有更好的方法来做到这一点?
Is there a better way to do this?
private unsafe void menuItem7_Click(object sender, EventArgs e)
{
var settings = Utility.GatherLocalSettings();
openFileDialog1.InitialDirectory = settings.SavePath;
openFileDialog1.Filter = "Scan Files (*.jpg)|*.jpg";
openFileDialog1.FilterIndex = 1;
openFileDialog1.RestoreDirectory = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
byte[] openFile = File.ReadAllBytes(openFileDialog1.FileName);
fixed (byte* p = openFile)
{
IntPtr img = (IntPtr)p;
frmContainer newScan = new frmContainer(img);
newScan.MdiParent = this;
newScan.Text = Path.GetFileName(openFileDialog1.FileName) + " [Saved]";
newScan.Show();
}
}
}
PS:我检查的csproj允许在构建不安全code
PS: I checked the csproj to allow unsafe code in the build.
推荐答案
试试这个,
IntPtr pval = IntPtr.Zero;
System.Drawing.Imaging.BitmapData bd = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
try
{
pval=bd.Scan0;
...
}
finally
{
bmp.UnlockBits(bd);
}
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