我正在编写一个C# WPF应用程序,我正在使用AForge库进行视频流。 我想部署应用程序,因为一切都在第一台电脑上工作。
比我部署它并在另一台PC上出现以下错误:
"必须与依赖对象在同一线程上创建依赖源,即使使用调度程序">
这是源代码,我在从网络摄像头获得的每个新帧上调用它
private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
{ if (StreamRunning( { 尝试 { using (var bitmap = (Bitmap(eventArgs.Frame.Clone((( {
Image = ToBitmapImage(bitmap);
}
Image.Freeze();
}
catch (Exception e)
{
UIMessages = "Error: NewFrame " + e.Message;
}
}
}
ToBitmap图像方法:
private BitmapImage ToBitmapImage(Bitmap bitmap)
{
var start = 420;
var end = 1920 - 2* 420;
BitmapImage bi = new BitmapImage();
bi.BeginInit();
MemoryStream ms = new MemoryStream();
Bitmap source = bitmap;
Bitmap CroppedImage = source.Clone(new System.Drawing.Rectangle(start, 0, end, 1080), source.PixelFormat);
CroppedImage.Save(ms, ImageFormat.Bmp);
ms.Seek(0, SeekOrigin.Begin);
bi.StreamSource = ms;
bi.EndInit();
return bi;
}
更多代码:
private BitmapImage _image;
public BitmapImage Image {
get => _image;
set
{
_image = value;
OnPropertyChanged();
}
}
相机的开始:
if (SelectedDevice != null)
{
_videoSource = new VideoCaptureDevice(SelectedDevice.MonikerString);
//var test = _videoSource.VideoCapabilities;
_videoSource.NewFrame += video_NewFrame;
_videoSource.Start();
}
用户界面:
<Image Height="400" Width="400" Source="{Binding Image, UpdateSourceTrigger=PropertyChanged}" Margin="0,0,0,0"/>
我也试过这个:
Dispatcher.CurrentDispatcher.Invoke(() => Image = ToBitmapImage(bitmap));
从流加载 BitmapImage 时,通常会尽快关闭 Stream,并通过设置BitmapCacheOption.OnLoad
来确保立即加载 BitmapImage 。
private static BitmapImage ToBitmapImage(Bitmap bitmap)
{
var start = 420;
var end = 1920 - 2 * 420;
var croppedBitmap = bitmap.Clone(
new System.Drawing.Rectangle(start, 0, end, 1080),
bitmap.PixelFormat);
var bi = new BitmapImage();
using (var ms = new MemoryStream())
{
croppedBitmap.Save(ms, ImageFormat.Bmp);
ms.Seek(0, SeekOrigin.Begin);
bi.BeginInit();
bi.CacheOption = BitmapCacheOption.OnLoad;
bi.StreamSource = ms;
bi.EndInit();
}
bi.Freeze();
return bi;
}