internal override Bitmap TakePicture()
{
int timeoutMSec = 20000;
Bitmap result = null;
// setup & connect
string captureWTitle = Application.ProductName + " " + m_index;
m_captureHwnd = NativeMethods.capCreateCaptureWindowA(ref captureWTitle, 0, 0, 0, 320, 240, 0, 0);
if (NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_DRIVER_CONNECT, m_index, 0) != 0)
{
NativeMethods.FrameReceivedEventHandler eventHandler = new NativeMethods.FrameReceivedEventHandler(FrameReceived);
NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_SET_SCALE, 0, 0);
NativeMethods.SendMessageCallback(m_captureHwnd, NativeMethods.WM_CAP_SET_CALLBACK_FRAME, 0, eventHandler);
// get frames until we've saved one
m_captureTemp = string.Empty;
int tickStart = Environment.TickCount;
while ((m_captureTemp.Length == 0) && (Environment.TickCount - tickStart < timeoutMSec))
{
NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_GRAB_FRAME, 0, 0);
if (m_captureTemp.Length == 0)
{
Thread.Sleep(100);
}
}
if (m_captureTemp.Length > 0)
{
MemoryStream ms = new MemoryStream(File.ReadAllBytes(m_captureTemp));
File.Delete(m_captureTemp);
result = (Bitmap)Bitmap.FromStream(ms);
}
NativeMethods.SendMessageCallback(m_captureHwnd, NativeMethods.WM_CAP_SET_CALLBACK_FRAME, 0, null);
NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_DRIVER_DISCONNECT, m_index, 0);
}
// destroy
NativeMethods.DestroyWindow(m_captureHwnd);
if (m_captureTemp.Length == 0)
{
throw new Exception();
}
return(result);
}
internal override Bitmap TakePicture()
{
int timeoutMSec = 20000;
Bitmap result = null;
// setup & connect
string captureWTitle = Application.ProductName + " " + m_index;
m_captureHwnd = NativeMethods.capCreateCaptureWindowA(ref captureWTitle, 0, 0, 0, 320, 240, 0, 0);
if (NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_DRIVER_CONNECT, m_index, 0) != 0) {
NativeMethods.FrameReceivedEventHandler eventHandler = new NativeMethods.FrameReceivedEventHandler(FrameReceived);
NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_SET_SCALE, 0, 0);
NativeMethods.SendMessageCallback(m_captureHwnd, NativeMethods.WM_CAP_SET_CALLBACK_FRAME, 0, eventHandler);
// get frames until we've saved one
m_captureTemp = string.Empty;
int tickStart = Environment.TickCount;
while ((m_captureTemp.Length == 0) && (Environment.TickCount - tickStart < timeoutMSec)) {
NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_GRAB_FRAME, 0, 0);
if (m_captureTemp.Length == 0) {
Thread.Sleep(100);
}
}
if (m_captureTemp.Length > 0) {
MemoryStream ms = new MemoryStream(File.ReadAllBytes(m_captureTemp));
File.Delete(m_captureTemp);
result = (Bitmap)Bitmap.FromStream(ms);
}
NativeMethods.SendMessageCallback(m_captureHwnd, NativeMethods.WM_CAP_SET_CALLBACK_FRAME, 0, null);
NativeMethods.SendMessage(m_captureHwnd, NativeMethods.WM_CAP_DRIVER_DISCONNECT, m_index, 0);
}
// destroy
NativeMethods.DestroyWindow(m_captureHwnd);
if (m_captureTemp.Length == 0) {
throw new Exception();
}
return result;
}
