如何修复另一个进程使用的控件 [英] How to fix control used by another process

问题描述

嗨我想做程序读取图像形式的pc并同时做多个进程问题是另一个进程使用的位图。

请帮助...



这是我的代码：



我尝试过：

Hi i want to do program read image form pc and do multiple processes at same time the problem is " the bitmap used by another process.
Please help ...

This is my code:

What I have tried:

public partial class Form1 : Form
    {
        Bitmap OriginalImage;
        public int pi_depth;
        public Form1()
        {
            InitializeComponent();
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                OriginalImage = new Bitmap(ofd.FileName);
                this.pictureBox1.Image = OriginalImage;
            }
        }
            public double DEPTH_PIXEL(int x1, int y1, int x2, int y2,Bitmap bmp)
            {
                double depthcalc = 0;
                for (int y = y1; y < y2; y++)
                {
                    for (int x = x1; x < x2; x++)
                    {
                        depthcalc = depthcalc + bmp.GetPixel(x, y).R;
                    }
                }
                //pi_depth = (max - pi_depth) / 255; //black
                bmp.Dispose();
                return depthcalc;

       
        }

            private void CMD_PARALLEL_Click(object sender, EventArgs e)
            {
                parallelfun(OriginalImage);
            }
            public void parallelfun(Bitmap bmpin)
            {
                int[] nums = { 1, 2, 3, 4 };
                int[] VALX1 = { 000, 201, 301, 401 };
                int[] VALY1 = { 000, 201, 301, 401 };
                int[] VALX2 = { 200, 300, 400, 500 };
                int[] VALY2 = { 200, 300, 400, 500 };
                Parallel.ForEach(nums, new ParallelOptions() { MaxDegreeOfParallelism = 5 }, item =>
                {
                    double DEPTH = DEPTH_PIXEL(VALX1[item - 1], VALY1[item - 1], VALX2[item - 1], VALY2[item - 1], bmpin);
                    Result(DEPTH.ToString());
                });
            }
            public void Result(string result)
            {
                if (listBox1.InvokeRequired)
                    listBox1.Invoke((MethodInvoker)delegate()
                    {
                        listBox1.Items.Add(result);
                    });
                else
                    listBox1.Items.Add(result);
            }
    }

推荐答案

你不能像在

parallelfun(OriginalImage);

相反，你必须创建一个新的，如下例所示：

instead you will have to create a new one like in the following example:

Bitmap original = new Bitmap("Test.jpg");
  long mem1 = Process.GetCurrentProcess().PrivateMemorySize64;
  Stopwatch timer = Stopwatch.StartNew();

  List<Bitmap> list = new List<Bitmap>();
  Random rnd = new Random();
  for(int i = 0; i < 50; i++)
  {
    list.Add(new Bitmap(original));
  }

  long mem2 = Process.GetCurrentProcess().PrivateMemorySize64;
  Debug.WriteLine("ElapsedMilliseconds: " + timer.ElapsedMilliseconds);
  Debug.WriteLine("PrivateMemorySize64: " + (mem2 - mem1));

有关详细信息，请参阅： c# - Bitmap.Clone（）与新Bitmap（Bitmap）有什么区别？ - 堆栈溢出 [ ^ ]



但我担心 GetPixel 和 SetPixel 根本无法安全地用于并行处理，请参阅： c＃ - Parallel.For语句返回带有位图处理的System.InvalidOperationException - 堆栈溢出 [ ^ ]



你可以使用此处提到的示例在缓冲区上运行： c＃ - 允许图像被几个线程访问 - S.大写溢出 [ ^ ]

For more information, see: c# - What's the difference between Bitmap.Clone() and new Bitmap(Bitmap)? - Stack Overflow[^]

But I'm afraid that GetPixel and SetPixel simply can't safely be used in parallel processing, see: c# - Parallel.For statement return "System.InvalidOperationException" with a Bitmap Processing - Stack Overflow[^]

You might use the example mentioned here which operates on a buffer: c# - Allow an Image to be accessed by several threads - Stack Overflow[^]

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