Name
grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync — Asynchronous grab of images and preprocessed image data from the specified
image acquisition device.
Herror grab_data_async(Hobject* Image, Hobject* Region, Hobject* Contours, const Hlong AcqHandle, double MaxDelay, char* Data)
Herror T_grab_data_async(Hobject* Image, Hobject* Region, Hobject* Contours, const Htuple AcqHandle, const Htuple MaxDelay, Htuple* Data)
Herror grab_data_async(Hobject* Image, Hobject* Region, Hobject* Contours, const HTuple& AcqHandle, const HTuple& MaxDelay, char* Data)
Herror grab_data_async(Hobject* Image, Hobject* Region, Hobject* Contours, const HTuple& AcqHandle, const HTuple& MaxDelay, HTuple* Data)
HImage HImage::GrabDataAsync(HRegion* Region, HXLDCont* Contours, const HFramegrabber& AcqHandle, const HTuple& MaxDelay, char* Data)
HImageArray HImageArray::GrabDataAsync(HRegionArray* Region, HXLDContArray* Contours, const HFramegrabber& AcqHandle, const HTuple& MaxDelay, HTuple* Data)
HImageArray HFramegrabber::GrabDataAsync(HRegion* Region, HXLDCont* Contours, const HTuple& MaxDelay, HTuple* Data) const
void GrabDataAsync(HObject* Image, HObject* Region, HObject* Contours, const HTuple& AcqHandle, const HTuple& MaxDelay, HTuple* Data)
HRegion HImage::GrabDataAsync(HXLDCont* Contours, const HFramegrabber& AcqHandle, double MaxDelay, HTuple* Data)
HRegion HImage::GrabDataAsync(HXLDCont* Contours, const HFramegrabber& AcqHandle, double MaxDelay, HString* Data)
HImage HRegion::GrabDataAsync(HXLDCont* Contours, const HFramegrabber& AcqHandle, double MaxDelay, HTuple* Data)
HImage HRegion::GrabDataAsync(HXLDCont* Contours, const HFramegrabber& AcqHandle, double MaxDelay, HString* Data)
HImage HFramegrabber::GrabDataAsync(HRegion* Region, HXLDCont* Contours, double MaxDelay, HTuple* Data) const
HImage HFramegrabber::GrabDataAsync(HRegion* Region, HXLDCont* Contours, double MaxDelay, HString* Data) const
void HOperatorSetX.GrabDataAsync(
[out] IHUntypedObjectX** Image, [out] IHUntypedObjectX** Region, [out] IHUntypedObjectX** Contours, [in] VARIANT AcqHandle, [in] VARIANT MaxDelay, [out] VARIANT* Data)
IHRegionX* HImageX.GrabDataAsync(
[out] IHXLDContX** Contours, [in] IHFramegrabberX* AcqHandle, [in] double MaxDelay, [out] VARIANT* Data)
IHImageX* HRegionX.GrabDataAsync(
[out] IHXLDContX** Contours, [in] IHFramegrabberX* AcqHandle, [in] double MaxDelay, [out] VARIANT* Data)
IHImageX* HFramegrabberX.GrabDataAsync(
[out] IHRegionX** Region, [out] IHXLDContX** Contours, [in] double MaxDelay, [out] VARIANT* Data)
static void HOperatorSet.GrabDataAsync(out HObject image, out HObject region, out HObject contours, HTuple acqHandle, HTuple maxDelay, out HTuple data)
HRegion HImage.GrabDataAsync(out HXLDCont contours, HFramegrabber acqHandle, double maxDelay, out HTuple data)
HRegion HImage.GrabDataAsync(out HXLDCont contours, HFramegrabber acqHandle, double maxDelay, out string data)
HImage HRegion.GrabDataAsync(out HXLDCont contours, HFramegrabber acqHandle, double maxDelay, out HTuple data)
HImage HRegion.GrabDataAsync(out HXLDCont contours, HFramegrabber acqHandle, double maxDelay, out string data)
HImage HFramegrabber.GrabDataAsync(out HRegion region, out HXLDCont contours, double maxDelay, out HTuple data)
HImage HFramegrabber.GrabDataAsync(out HRegion region, out HXLDCont contours, double maxDelay, out string data)
The operator grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync requests asynchronously grabbed images
and preprocessed image data from the image acquisition device specified by
AcqHandleAcqHandleAcqHandleAcqHandleAcqHandleacqHandle.
By default, grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync also starts the next asynchronous grab
before the operator returns.
More information about the behavior of a specific image acquistion device can
be found in the corresponding interface documentation in the directory
'doc/html/reference/acquisition'"doc/html/reference/acquisition""doc/html/reference/acquisition""doc/html/reference/acquisition""doc/html/reference/acquisition""doc/html/reference/acquisition".
The desired operational mode of the image acquisition device as well as a
suitable image part and additional interface-specific settings can be
specified using the operators open_framegrabberopen_framegrabberOpenFramegrabberopen_framegrabberOpenFramegrabberOpenFramegrabber and
set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamset_framegrabber_paramSetFramegrabberParamSetFramegrabberParam.
Depending on the current configuration of the image acquisition device, the
preprocessed image data can be returned in terms of images
(ImageImageImageImageImageimage), regions (RegionRegionRegionRegionRegionregion), XLD contours
(ContoursContoursContoursContoursContourscontours), and control data (DataDataDataDataDatadata).
The grab of the next image is finished by calling
grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync or grab_image_asyncgrab_image_asyncGrabImageAsyncgrab_image_asyncGrabImageAsyncGrabImageAsync. If more than
MaxDelayMaxDelayMaxDelayMaxDelayMaxDelaymaxDelay ms have passed since the asynchronous grab was
started, the asynchronously grabbed image is considered as too old
and a new image is grabbed, if necessary. If a negative value is assigned to
MaxDelayMaxDelayMaxDelayMaxDelayMaxDelaymaxDelay, this control mechanism is deactivated.
To abort the grab, the operator set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamset_framegrabber_paramSetFramegrabberParamSetFramegrabberParam with the
parameter 'do_abort_grab' can be used if the specific image
acquisition interface supports it. Note that as an exception from
the description of the concurrent usage in multiple threads (see below)
'do_abort_grab' can also be used from another thread.
Please note that if you call the operators grab_imagegrab_imageGrabImagegrab_imageGrabImageGrabImage or
grab_datagrab_dataGrabDatagrab_dataGrabDataGrabData after grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync, the asynchronous
grab started by grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync is aborted and a new
synchronous grab is started.
For a multithreaded application all image acquisition operators
(as listed in open_framegrabberopen_framegrabberOpenFramegrabberopen_framegrabberOpenFramegrabberOpenFramegrabber) are
an own group in which info_framegrabberinfo_framegrabberInfoFramegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabber, open_framegrabberopen_framegrabberOpenFramegrabberopen_framegrabberOpenFramegrabberOpenFramegrabber,
close_framegrabberclose_framegrabberCloseFramegrabberclose_framegrabberCloseFramegrabberCloseFramegrabber and close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers are
executed exclusively.
grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync runs in parallel with all non-exclusive
operators inside and outside of this group.
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Processed without parallelization.
Pre-processed image regions.
Pre-processed XLD contours.
Handle of the acquisition device to be used.
Maximum tolerated delay between the start of the
asynchronous grab and the delivery of the image [ms].
Default value: -1.0
Suggested values: -1.0, 20.0, 33.3, 40.0, 66.6, 80.0, 99.9
DataDataDataDataDatadata (output_control) string(-array) → HTupleHTupleHTupleVARIANTHtuple (string / real / integer) (string / double / int / long) (HString / double / Hlong) (char* / double / Hlong) (BSTR / double / Hlong) (char* / double / Hlong)
Pre-processed control data.
* Select a suitable image acquisition interface name AcqName
open_framegrabber(AcqName,1,1,0,0,0,0,'default',-1,'default',-1.0, \
'default','default','default',-1,-1,AcqHandle)
* Grab image, segment it, and start next grab
grab_data_async (Image1, Region1, Contours1, AcqHandle, -1.0, Data1)
* Process data 1...
* Finish asynchronous grab, segment this image, and start next grab
grab_data_async (Image2, Region2, Contours2, AcqHandle, -1.0, Data2)
* Process data 2...
close_framegrabber(AcqHandle)
If the image acquisition device is open and supports the image
acquisition via grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync, the operator
grab_data_asyncgrab_data_asyncGrabDataAsyncgrab_data_asyncGrabDataAsyncGrabDataAsync returns the value 2 (H_MSG_TRUE). Otherwise an
exception is raised.
open_framegrabberopen_framegrabberOpenFramegrabberopen_framegrabberOpenFramegrabberOpenFramegrabber,
grab_image_startgrab_image_startGrabImageStartgrab_image_startGrabImageStartGrabImageStart,
set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamset_framegrabber_paramSetFramegrabberParamSetFramegrabberParam
grab_image_asyncgrab_image_asyncGrabImageAsyncgrab_image_asyncGrabImageAsyncGrabImageAsync,
set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamset_framegrabber_paramSetFramegrabberParamSetFramegrabberParam,
close_framegrabberclose_framegrabberCloseFramegrabberclose_framegrabberCloseFramegrabberCloseFramegrabber
open_framegrabberopen_framegrabberOpenFramegrabberopen_framegrabberOpenFramegrabberOpenFramegrabber,
info_framegrabberinfo_framegrabberInfoFramegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabber,
set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamset_framegrabber_paramSetFramegrabberParamSetFramegrabberParam
Foundation