Comments (4)
Hello, thank you for advice me important information.
Before I fix it, I have to understand the mechanism of Thread and ThreadPool.
I will investigate, Thank you.
from usbcamera.
hello @Spring-grow
Could you teach me.
Is it Okey if I replace QueueUserWorkItem to 'new thread'?
public SampleGrabberCallback(DirectShow.ISampleGrabber grabber, int width, int height, int stride, bool useCache)
{
this.BmpBuilder = new BitmapBuilder(width, height, stride, useCache);
// create Buffered.Invoke thread.
BufferedEvent = new System.Threading.AutoResetEvent(false);
var thread = new System.Threading.Thread(x =>
{
while (true)
{
BufferedEvent.WaitOne(); // wait event.
Buffered?.Invoke(GetBitmap()); // fire!
}
});
thread.IsBackground = true;
thread.Start();
/*System.Threading.ThreadPool.QueueUserWorkItem(x =>
{
while (true)
{
BufferedEvent.WaitOne(); // wait event.
Buffered?.Invoke(GetBitmap()); // fire!
}
});*/
grabber.SetCallback(this, 1); // WhichMethodToCallback = BufferCB
}
from usbcamera.
Here's the current situation: In WPF, I've initiated a camera and started capturing video. When the code for closing the camera is executed, the locations where the BufferedEvent.WaitOne() method is used might get blocked directly. In other words, after notifying the camera to shut down, the BufferCB() method is not invoked. The line if (Buffered != null) BufferedEvent.Set(); is not being used, which results in the BufferedEvent.WaitOne() method being continuously blocked. Therefore, when using Thread or ThreadPool, it is crucial to ensure that the thread generating the bitmap is closed first. This is my preliminary understanding. I am currently writing the code and preparing to verify my hypothesis.
from usbcamera.
I decided to use new Thread instead of ThreadPool.
I noteced that Task.Run() method has TaskCreationOptions.LongRunning flag, and
if this flag is setted, Task do not use ThreadPool, but use new Thread.
This means long running thread should not use ThreadPool, but use new Thread.
This time I applied this idea.
from usbcamera.
Related Issues (20)
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- Add a feature to get plain image data as byte array to not call lock bits over and over again HOT 15
- Inconsistent Image Quality When Saving Still Capture Monochrome Sensor Data as BMP HOT 8
- Can't able to set brightness and exposure at run time when camera running on different thread HOT 2
- Capture Pin not working on all cameras HOT 3
- happens ArgumentException when I dispose PictureBox's old image. HOT 1
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- why not working in 4K? HOT 6
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from usbcamera.