private void timerPhoneWebCam_Tick(object sender, EventArgs e)
{
if (vidCapt == null)
{
if (intPtrVideo != IntPtr.Zero) // Release any previous buffer
{
Marshal.FreeCoTaskMem(intPtrVideo);
intPtrVideo = IntPtr.Zero;
}
int deviceCount = VideoCapture.GetDeviceCount();
if (deviceCount > 0)
{
try {
vidCapt = new VideoCapture(0, 640, 480, 24, pictBoxVideo);
//image capture will now continue below if successful
}
catch {
Phones.SetWebCamImage(IpAddressCur, null, Environment.MachineName);
return; //haven't actually seen this happen since we started properly disposing of vidCapt
}
}
Phones.SetWebCamImage(IpAddressCur, null, Environment.MachineName);
}
if (vidCapt != null)
{
if (intPtrVideo != IntPtr.Zero) // Release any previous buffer
{
Marshal.FreeCoTaskMem(intPtrVideo);
intPtrVideo = IntPtr.Zero;
}
Bitmap bitmapSmall = null;
try {
intPtrVideo = vidCapt.Click(); //will fail if camera unplugged
Bitmap bitmap = new Bitmap(vidCapt.Width, vidCapt.Height, vidCapt.Stride, PixelFormat.Format24bppRgb, intPtrVideo);
bitmap.RotateFlip(RotateFlipType.RotateNoneFlipY); // If the image is upsidedown
int w = 50;
int h = (int)(((float)w) / 640f * 480f);
bitmapSmall = new Bitmap(w, h);
using (Graphics g = Graphics.FromImage(bitmapSmall)) {
g.DrawImage(bitmap, new Rectangle(0, 0, bitmapSmall.Width, bitmapSmall.Height));
}
bitmap.Dispose();
bitmap = null;
}
catch {
//bitmapSmall will remain null
vidCapt.Dispose();
vidCapt = null; //To prevent the above slow try/catch from happening again and again.
}
finally {
//Marshal.FreeCoTaskMem(intPtrVideo);
}
if (IpAddressCur != "") //found entry in phone table matching this machine ip.
{
Phones.SetWebCamImage(IpAddressCur, bitmapSmall, Environment.MachineName);
}
if (bitmapSmall != null)
{
bitmapSmall.Dispose();
bitmapSmall = null;
}
}
}