Comments (2)
Hello, thank you for your question.
As you said, it is true that it happens exception if you access camera instance from different thread that create camera instance.
To handle this situation, you have to access camera instance same thread that create camera instance.
To do this, I think it's depend on your program architecture,
there are some solutions, use Task, ReactiveExtentions,
or switch thread by using event Set() and WaitOne().
Here is sample.
private void Form1_Load(object sender, EventArgs e)
{
System.Threading.ThreadPool.QueueUserWorkItem(x =>
{
// here is worker thread. create camera instance here.
UsbCamera camera = CreateCamera();
var value_changed_event = new System.Threading.AutoResetEvent(false);
int value = 0;
numericUpDown1.ValueChanged += (s, ev) =>
{
// here is UI thread. to access camera instance, use event.Set().
value = (int)numericUpDown1.Value;
value_changed_event.Set();
};
// main loop.
while (true)
{
// wait until value changed.
value_changed_event.WaitOne();
// resume thread if event.Set() invoked.
// set property.
var prop = camera.Properties[DirectShow.CameraControlProperty.Focus];
if (prop.Available)
{
prop.SetValue(DirectShow.CameraControlFlags.Manual, value);
}
}
});
}
from usbcamera.
Thank you it's worked for me!!!
from usbcamera.
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from usbcamera.