Question

我要从多台摄像机获取图像，只需将其放在WPF中即可。但是存在内存泄漏问题。这是代码；

        for (int i = 0; i < grabResultsList.Count; i++)
        {


            int width = grabResultsList.ElementAt(i).Width;
            int height = grabResultsList.ElementAt(i).Height;
            byte[] pixels = grabResultsList.ElementAt(i).PixelData as byte[];
            byte[] pixelsnew = getNewByteArray(pixels, width, height);
            int stride = width / 2 * 3;

            BitmapSource bitmap = BitmapSource.Create(width / 2, height / 2, 96d, 96d, pf, null, pixelsnew, stride);

            StackPanel s = MainGrid.Children[i] as StackPanel;
            Image img = s.Children[0] as Image;

            img.Source = bitmap;


            grabResultsList.ElementAt(i).Dispose();
            GC.Collect();
        }

这是从Visual Studio中获取的内存图；

如您所见，RAM图不断增加。

当我评论此行时 img.Source =位图;

        for (int i = 0; i < grabResultsList.Count; i++)
        {


            int width = grabResultsList.ElementAt(i).Width;
            int height = grabResultsList.ElementAt(i).Height;
            byte[] pixels = grabResultsList.ElementAt(i).PixelData as byte[];
            byte[] pixelsnew = getNewByteArray(pixels, width, height);
            int stride = width / 2 * 3;

            BitmapSource bitmap = BitmapSource.Create(width / 2, height / 2, 96d, 96d, pf, null, pixelsnew, stride);

            StackPanel s = MainGrid.Children[i] as StackPanel;
            Image img = s.Children[0] as Image;

            //img.Source = bitmap;


            grabResultsList.ElementAt(i).Dispose();
            GC.Collect();
        }

如您所见，RAM图形是恒定的。

我正在使用GarbageCollector，但仍然有此问题。有什么方法可以处置Image对象或该怎么办？

Answer 1

您应先将BitmapSource冻结，然后再将其分配给Image的Source属性：

bitmap.Freeze();
img.Source = bitmap;

除此之外，可以在每个帧上重用WriteableBitmap，而不是在每个帧上创建新的BitmapSource：

var pw = width / 2;
var ph = height / 2;
var bitmap = img.Source as WriteableBitmap;

if (bitmap == null || bitmap.PixelWidth != pw || bitmap.PixelHeight != ph)
{
    bitmap = new WriteableBitmap(pw, ph, 96, 96, pf, null);
    img.Source = bitmap;
}

bitmap.WritePixels(new Int32Rect(0, 0, pw, ph), pixelsnew, stride, 0);

使用Image.source时C＃WPF内存泄漏

1 个答案: