问题描述
我正在创建一个应用程序(Windows 窗体),允许用户根据他们选择的位置(拖动以选择区域)截取屏幕截图.我想添加一个放大的小预览窗格",以便用户可以更精确地选择他们想要的区域(更大的像素).在 mousemove 事件中,我有以下代码...
I'm creating an application (Windows Form) that allows the user to take a screenshot based on the locations they choose (drag to select area). I wanted to add a little "preview pane" thats zoomed in so the user can select the area they want more precisely (larger pixels). On a mousemove event i have a the following code...
private void falseDesktop_MouseMove(object sender, MouseEventArgs e)
{
zoomBox.Image = showZoomBox(e.Location);
zoomBox.Invalidate();
bmpCrop.Dispose();
}
private Image showZoomBox(Point curLocation)
{
Point start = new Point(curLocation.X - 50, curLocation.Y - 50);
Size size = new Size(100, 90);
Rectangle rect = new Rectangle(start, size);
Image selection = cropImage(falseDesktop.Image, rect);
return selection;
}
private static Bitmap bmpCrop;
private static Image cropImage(Image img, Rectangle cropArea)
{
if (cropArea.Width != 0 && cropArea.Height != 0)
{
Bitmap bmpImage = new Bitmap(img);
bmpCrop = bmpImage.Clone(cropArea, bmpImage.PixelFormat);
bmpImage.Dispose();
return (Image)(bmpCrop);
}
return null;
}
失败并出现内存不足异常的行是:
The line that fails and has the Out of Memory exception is:
bmpCrop = bmpImage.Clone(cropArea, bmpImage.PixelFormat);
基本上它的作用是在鼠标指针周围取一个 100x90 的矩形并将其拉入缩放框,这是一个图片框控件.但是,在此过程中,我收到内存不足错误.我在这里做错了什么?
Basically what this does is it takes a 100x90 rectangle around the mouse pointer and pulls that into the zoomBox, which is a picturebox control. However, in the process, i get an Out Of Memory error. What is it that i am doing incorrectly here?
感谢您的帮助.
推荐答案
C# 成像中的内存不足,通常是错误的 rect 或 point 的标志 - 有点红鲱鱼.我敢打赌 start
在发生错误或 Size.Hight + Y 或 Size.Width + X 大于图像的高度或宽度时具有 负 X 或 Y.
Out of memory in C# imaging, is usually sign of wrong rect or point - a bit of red herring. I bet start
has negative X or Y when error happens or the Size.Hight + Y or Size.Width + X is bigger than Hight or width of the image.
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