如何读取通过代码Draw的图像像素颜色？

[weixin_38051999]

例如，通过代码在Panel的paint事件上DrawString或DrawRectangle，这些图像信息显示在Panel上，用什么代码能获取这些图像，输出为Bitmap或BitmapData？
具体看看以下代码：
Dim TempGraphics As Graphics = e.Graphics Dim TempFont As Font = New Font("Arial", 8) TempGraphics.DrawString("TestString测试", TempFont, Brushes.Black, New Point(0, 0)) Dim bp As Bitmap = New Bitmap(m_Label.Width, m_Label.Height) m_Label.DrawToBitmap(bp, New Rectangle(0, 0, bp.Width, bp.Height)) Dim BackColor As Color = m_Label.BackColor Dim NewRegion As Region = New Region() For y As Integer = 0 To DrawArea.Height - 1 For x As Integer = 0 To DrawArea.Width - 1 Dim c As Color = bp.GetPixel(x, y) If c.ToArgb <> 0 Then Debug.Print(c.ToArgb) Next Next bp.Dispose()
我运行的结果是没有输出，bp.GetPixel(x, y).ToArgb的结果都是0，也就是没有读取到panel上的图像。


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