任务，等待网络摄像头

问题描述

您好，我正在尝试编写支持网络摄像头的简单应用.我正在使用此库(我知道这是错误的，但现在我需要做很多更改:()http://easywebcam.codeplex.com/.

当我连接到摄像头时，用户界面的响应速度非常慢，当我从摄像头更改所需的fps时，效果会更好一些(我认为我的UI会得到与摄像头相同的效果).

我试图编写函数以获取线程中的帧，以使我的ui不会变慢.

异步void webcam_ImageCapturedAsync(对象源，WebcamEventArgs e)
        {
            _FrameImage.Source =等待Helper.LoadBitmapAsync((System.Drawing.Bitmap)e.WebCamImage);
        }

        无效的webcam_ImageCaptured(对象源，WebcamEventArgs e)
        {
            _FrameImage.Source = Helper.LoadBitmap((System.Drawing.Bitmap)e.WebCamImage);
        } 

 

还有

公共异步静态Task< BitmapSource> LoadBitmapAsync(System.Drawing.Bitmap源)
        {
            返回等待任务< BitmapSource> .Run(()=>
                {
                    ip = source.GetHbitmap();

                    bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip，IntPtr.Zero，System.Windows.Int32Rect.Empty，

                    System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

                    DeleteObject(ip);

                    返回bs；
                });

        }
        公共静态BitmapSource LoadBitmap(System.Drawing.Bitmap源)
        {

                ip = source.GetHbitmap();

                bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip，IntPtr.Zero，System.Windows.Int32Rect.Empty，

                System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

                DeleteObject(ip);

                返回bs；

        } 

异步方法是我写的，其他方法来自库.

当我使用异步方法启动程序时，我的图像框保持灰色，在调试器中所有参数都出错.那么问题是为什么呢? :> 

解决方案

Hi, i'm trying to write simple app with webcam support. I'm using this library ( i know that was mistake but now i would have change some much :( ) http://easywebcam.codeplex.com/ .

When I'm connected to camera my UI respond very slow, when i change required fps from camera it's a little better ( i think my UI gets as much as the camera give).

I tried to write function that gets frames in thread so my ui don't slow down.

  async void webcam_ImageCapturedAsync(object source, WebcamEventArgs e)
        {
            _FrameImage.Source =await Helper.LoadBitmapAsync((System.Drawing.Bitmap)e.WebCamImage);
        }

        void webcam_ImageCaptured(object source, WebcamEventArgs e)
        {
            _FrameImage.Source = Helper.LoadBitmap((System.Drawing.Bitmap)e.WebCamImage);
        }

 

And

 public async static Task<BitmapSource> LoadBitmapAsync(System.Drawing.Bitmap source)
        {
            return await Task<BitmapSource>.Run(() =>
                {
                    ip = source.GetHbitmap();

                    bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip, IntPtr.Zero, System.Windows.Int32Rect.Empty,

                    System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

                    DeleteObject(ip);

                    return bs;
                });

        }
        public static BitmapSource LoadBitmap(System.Drawing.Bitmap source)
        {

                ip = source.GetHbitmap();

                bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip, IntPtr.Zero, System.Windows.Int32Rect.Empty,

                System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

                DeleteObject(ip);

                return bs;

        }

Async methods are written my me, and the other ones are from library.

And when i start program with async methods my imagebox stay grey, in debuger all parameters have error. So the question is why? :> 

解决方案

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