islogging

Determine if video input object is acquiring data

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Syntax

tf = islogging(obj)

Description

tf = islogging(obj) returns logical 1 (true) if the video input object obj is acquiring data and logical 0 (false) otherwise. A video input object is acquiring data if the value of its Logging property is 'on'.

example

Examples

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Create a video input object that connects to hardware such as a Windows web cam. 

obj1 = videoinput("winvideo",1,"MJPG_1280x720");

Start acquiring data. This example acquires 500 frames to increase the amount of time that the object remains in logging state.

obj1.FramesPerTrigger = 500;
start(obj1)

When the call to start returns, use islogging to check the state of the object. If the object is still acquiring data, islogging returns 1.

tf = islogging(obj1)
tf =

  logical

   1

Stop the acquisition and check the logging status again.

stop(obj1)
tf = islogging(obj1)
tf =

  logical

   0

Now, create another connection. 

obj2 = videoinput("winvideo");

Start the first object again and use islogging to determine which of the two objects is acquiring data.

start(obj1)
tf = isrunning([obj1 obj2])
tf =

  1×2 logical array

   1   0

Input Arguments

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Video input object to query, specified as a video input object created using videoinput.

Output Arguments

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Whether obj is acquiring data, returned as numeric or logical 1 (true) or 0 (false).

If obj is an array of video input objects, tf is an array where each element indicates whether the corresponding element in obj is acquiring data.

Version History

Introduced before R2006a

See Also

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