CODEWITHSUNDEEP
c++opencv
Simplicity
Simplicity

Reputation: 48966

cvCreateFileCapture()

In the Learning OpenCV book, it the following is mentioned about this statement:

CvCapture* capture = cvCreateFileCapture(argv[1]);

The function cvCreateFileCapture() takes as its argument the name of the AVI file to be loaded and then returns a pointer to a CvCapture structure.

Can you just explain the sentence: "then returns a pointer to a CvCapture structure"?

Upvotes: 0

Views: 3894

Answers (1)

Christian Rau
Christian Rau

Reputation: 45968

It just allocates a new CvCapture structure and returns a pointer to this structure. You don't really access the fields of this structure but pass the pointer to other functions that work on the file capture, like cvQueryFrame or cvSetCaptureProperty. And don't forget to free the resources with cvReleaseCapture when you're done with the file.

This shouldn't be too hard to understand with some basic C-knowledge, especially with respect that many OpenCV function work this way.

By the way, as your question is tagged C++, consider using the C++-interface of OpenCV, which abstracts many of those things away. Although there is no real book for it, only for the C-interface.

Upvotes: 2

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