© 2013 Thorlabs GmbH
4 Programming (SDK)
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4.3.27 is_ForceTrigger
Syntax
INT is_ForceTrigger (HIDS hCam)
Description
You can use is_ForceTrigger() to force a software-controlled capture of an image while a capturing process
triggered by hardware is in progress. This function can only be used if the triggered capturing process was started
using the IS_DONT_WAIT parameter.
Input parameters
Return values
IS_CANT_COMMUNICATE_WITH_DRIVER
Communication with the driver failed because no driver
has been loaded.
An attempt to initialize or select the camera failed (no
camera connected or initialization error).
One of the submitted parameters is outside the valid
range or is not supported for this sensor or is not
available in this mode.
An IO request from the uc480 driver failed. Possibly the
versions of the uc480_api.dll (API) and the driver file
(uc480_usb.sys) do not match.
Function executed successfully
Related functions
is_FreezeVideo()
is_CaptureVideo()
is_SetExternalTrigger()
Example
Enable trigger and wait 1 second for the external trigger. If no trigger signal has arrived, force an exception using
is_ForceTrigger().
HANDLE hEvent = CreateEvent(NULL, TRUE, FALSE, "");
if ( hEvent != NULL )
{
is_InitEvent(hCam, m_hEvent, IS_SET_EVENT_FRAME);
is_EnableEvent(hCam, IS_SET_EVENT_FRAME);
is_SetExternalTrigger(hCam, IS_SET_TRIGGER_HI_LO);
is_FreezeVideo(hCam, IS_DONT_WAIT);
if (WaitForSingleObject(m_hEvent, 1000) != WAIT_OBJECT_0)
{
// No trigger has been received, so force image capture
is_ForceTrigger(hCam);
}
is_DisableEvent(hCam, IS_SET_EVENT_FRAME);
is_ExitEvent(hCam, IS_SET_EVENT_FRAME);
}
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