close_framegrabberT_close_framegrabberCloseFramegrabberCloseFramegrabberclose_framegrabber (算子)

名称

close_framegrabberT_close_framegrabberCloseFramegrabberCloseFramegrabberclose_framegrabber — 关闭指定的图像采集设备。

签名

描述

算子 close_framegrabberclose_framegrabberCloseFramegrabberCloseFramegrabberCloseFramegrabberclose_framegrabber closes the image acquisition device specified by AcqHandleAcqHandleAcqHandleAcqHandleacqHandleacq_handle. In particular, allocated memory for data buffers is released and the image acquisition device is made available for other processes.

注意

For a multithreaded application, info_framegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabberInfoFramegrabberinfo_framegrabber, open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabberopen_framegrabber, and close_framegrabberclose_framegrabberCloseFramegrabberCloseFramegrabberCloseFramegrabberclose_framegrabber are executed exclusively. Thus, they block the concurrent execution of each other, but run in parallel with all non-exclusive operators outside of this group.

Make sure that close_framegrabberclose_framegrabberCloseFramegrabberCloseFramegrabberCloseFramegrabberclose_framegrabber is not called for a framegrabber handle that is being used by another thread concurrently.

执行信息

• 多线程类型：可重入（与非独占算子并行运行）。
• 多线程作用域：全局（可从任何线程调用）。
• 未采用并行化处理。

此算子修改后续输入参数的状态：

• AcqHandleAcqHandleAcqHandleAcqHandleacqHandleacq_handle

在执行此算子时，若该参数值需在多个线程间使用，则必须对其访问进行同步。

参数

结果

If the specified image acquisition device could be closed, close_framegrabberclose_framegrabberCloseFramegrabberCloseFramegrabberCloseFramegrabberclose_framegrabber 返回值 2 ( H_MSG_TRUE )。否则将抛出异常。

可能的前趋

grab_imagegrab_imageGrabImageGrabImageGrabImagegrab_image, grab_image_asyncgrab_image_asyncGrabImageAsyncGrabImageAsyncGrabImageAsyncgrab_image_async

另见

open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabberopen_framegrabber

模块

基础