如何在C#中将位图图像转换为IntPtr?

时间:2009-08-20 01:26:05

标签: c# bitmap intptr

我从我看到的一个例子中做到了这一点,它从未抛出任何错误,但图像显示为灰色。

有更好的方法吗?

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:我检查了csproj以允许构建中的不安全代码。

2 个答案:

答案 0 :(得分:5)

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);
}

答案 1 :(得分:2)

如果我理解正确,您正在尝试加载.bmp文件。为此,请使用Image.FromFile()。然后,你可以用它做任何你想做的事。