csharp unsafe BitmapData 访问内存泄漏

Posted 2023-03-29

【中文标题】csharp unsafe BitmapData 访问内存泄漏

【英文标题】：csharp unsafe BitmapData Access Memory Leak

【发布时间】：2018-01-22 14:03:01

【问题描述】：

        public Point PixelSearchPoint(Bitmap b, Color PixelColor, int Shade_Variation)
    


        Color Pixel_Color = PixelColor;

        Point Pixel_Coords = new Point(-1, -1);
        using (Bitmap RegionIn_Bitmap = (Bitmap)b.Clone())
        
            BitmapData RegionIn_BitmapData = RegionIn_Bitmap.LockBits(new Rectangle(0, 0, RegionIn_Bitmap.Width, RegionIn_Bitmap.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

            int[] Formatted_Color = new int[3]  Pixel_Color.B, Pixel_Color.G, Pixel_Color.R ; //bgr

            unsafe
            
               for (int y = 0; y < RegionIn_BitmapData.Height; y++)
                
                    byte* row = (byte*)RegionIn_BitmapData.Scan0 + (y * RegionIn_BitmapData.Stride);

                    for (int x = 0; x < RegionIn_BitmapData.Width; x++)
                    
                        if (row[x * 3] >= (Formatted_Color[0] - Shade_Variation) & row[x * 3] <= (Formatted_Color[0] + Shade_Variation)) //blue
                        
                            if (row[(x * 3) + 1] >= (Formatted_Color[1] - Shade_Variation) & row[(x * 3) + 1] <= (Formatted_Color[1] + Shade_Variation)) //green
                            
                                if (row[(x * 3) + 2] >= (Formatted_Color[2] - Shade_Variation) & row[(x * 3) + 2] <= (Formatted_Color[2] + Shade_Variation)) //red
                                
                                    Pixel_Coords = new Point(x, y);
                                    RegionIn_Bitmap.Dispose();
                                    goto End;

                                
                            
                        
                    
                
            
        
        End:
        b.Dispose();
        GC.Collect();
        GC.WaitForPendingFinalizers();
        return Pixel_Coords;
    

此代码从位图中搜索查找颜色代码

 using (Bitmap b = new Bitmap(NativeHelper.GetOriginalWinScreen(handle)))
                            


                                Point p = PixelSearchPoint(b, c, 0);
                                if (p.X != -1 && p.Y != -1)
                                
                                    Logwrite(p.X + "/" + p.Y + " Click With" + c.ToString());
                                    chk = true;
                                    ClickPos(p.X, p.Y);
                                    notecomplete = true;
                                    counttest++;
                                

                                b.Dispose();

                            

当访问不安全的方法时，这段代码内存泄漏得如此之快 GC.Collect 和 GC.WaitForPendingFinalizers();不使用 UnSafe 方法？？

使用 GDI+ Capture 和此方法不是 MemoryLeak 的原因 使用 Foreach Find Point from Color using unsafe method

【参考方案1】：

如果您调用 RegionIn_Bitmap.LockBits，您需要确保在处理之前调用 UnlockBits。

【讨论】：

Pixel_Coords = new Point(x, y); b.UnlockBits(RegionIn_BitmapData); b.Dispose(); RegionIn_Bitmap.Dispose(); GC.Collect(); GC.WaitForPendingFinalizers(); goto End; 仍然不工作..