問題描述

我正在創建一個應用程序(Windows 窗體)，允許用戶根據他們選擇的位置(拖動以選擇區域)截取屏幕截圖.我想添加一個放大的小預覽窗格"，以便用戶可以更精確地選擇他們想要的區域(更大的像素).在 mousemove 事件中，我有以下代碼...

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;
    }

失敗并出現內存不足異常的行是:

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標指針周圍取一個 100x90 的矩形并將其拉入縮放框，這是一個圖片框控件.但是，在此過程中，我收到內存不足錯誤.我在這里做錯了什么?

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?

感謝您的幫助.

推薦答案

C# 成像中的內存不足，通常是錯誤的 rect 或 point 的標志 - 有點紅鯡魚.我敢打賭 start 在發生錯誤或 Size.Hight + Y 或 Size.Width + X 大于圖像的高度或寬度時具有 負 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.

這篇關于C# 創建位圖時內存不足的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！