C# - 根据计时器截取屏幕截图

时间:2010-03-31 00:29:44

标签: c# gdi+ screenshot

我正在尝试创建一个WinForms应用程序,该应用程序在设定的时间间隔内截取屏幕截图。我认为我的代码是正确的,但是当我尝试运行它时,我收到错误消息“System.Runtime.InteropServices.ExternalException未处理,GDI +中发生了一般错误。”

    System.Windows.Forms.Timer t = new System.Windows.Forms.Timer();
    Thread th;
    private static Bitmap bmpScreenshot;
    private static Graphics gfxScreenshot;

    void TakeScreenShot()
    {
        bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);
        gfxScreenshot = Graphics.FromImage(bmpScreenshot);
        gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);
        bmpScreenshot.Save(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + @"\ScreenCaptures", ImageFormat.Png);
        th.Abort();
    }

    void StartThread(object sender, EventArgs e)
    {
        th = new Thread(new ThreadStart(TakeScreenShot));
        th.Start();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        Directory.CreateDirectory(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + @"\ScreenCaptures");
        t.Interval = 500;
        t.Tick += new EventHandler(StartThread);
        t.Start();
    }

给我带来麻烦的是:

bmpScreenshot.Save(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + @"\ScreenCaptures", ImageFormat.Png);

关于出了什么问题的任何想法?提前谢谢。

1 个答案:

答案 0 :(得分:3)

您需要使用实际文件名保存,如下所示:

bmpScreenshot.Save(Environment.GetFolderPath
    (Environment.SpecialFolder.DesktopDirectory) 
    + @"\ScreenCaptures\newfile.png", ImageFormat.Png);

您的代码传递的路径不包含文件名。另外,请检查以确保Environment.GetFolderPath(...)返回末尾没有“\”的路径,否则您的路径中将以“\\”结尾。