ClassesClassesClassesClasses | | | | Operators

close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers (Operator)

Name

close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers — Close all image acquisition devices.

Signature

close_all_framegrabbers( : : : )

Herror close_all_framegrabbers()

Herror T_close_all_framegrabbers()

Herror close_all_framegrabbers()

void CloseAllFramegrabbers()

static void HMisc::CloseAllFramegrabbers()

void HOperatorSetX.CloseAllFramegrabbers()

void HMiscX.CloseAllFramegrabbers()

static void HOperatorSet.CloseAllFramegrabbers()

static void HMisc.CloseAllFramegrabbers()

Description

The operator close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers closes all currently open image acquisition devices. It is used to cope with deadlocks resulting from damaged image acquisition handles (in that case the use of close_framegrabberclose_framegrabberCloseFramegrabberclose_framegrabberCloseFramegrabberCloseFramegrabber is impossible).

Attention

close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers exists solely for the purpose of implementing the “reset program” functionality in HDevelop. close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers must not be used in any application.

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.

Thus, info_framegrabberinfo_framegrabberInfoFramegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabber, open_framegrabberopen_framegrabberOpenFramegrabberopen_framegrabberOpenFramegrabberOpenFramegrabber, close_framegrabberclose_framegrabberCloseFramegrabberclose_framegrabberCloseFramegrabberCloseFramegrabber and close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers block the concurrent execution of all other operators within this group, but run in parallel with all non-exclusive operators outside of this group.

Parallelization

Result

If it is possible to close all image acquisition devices, the operator close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbers returns the value 2 (H_MSG_TRUE). Otherwise an exception is raised.

Possible Predecessors

grab_imagegrab_imageGrabImagegrab_imageGrabImageGrabImage, grab_image_asyncgrab_image_asyncGrabImageAsyncgrab_image_asyncGrabImageAsyncGrabImageAsync

See also

open_framegrabberopen_framegrabberOpenFramegrabberopen_framegrabberOpenFramegrabberOpenFramegrabber

Module

Foundation


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