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Reputation: 601

Calling an Objective-C Function from C++ in an iPhone App

I have a piece of code written in C++ which is cross-platform and uses OpenCV.

My C++ code does some processing on an image input.

I want to use iOS's AVFoundation to decode a video and send the data to C++ for processing.

I can find many tutorials that allow me to run C++ code in my App, but what I need is to call an Objective-C function from C++ that will request the next frame of the video.

Please Help.

Oh and I know that OpenCV has a VideoReader class - but I need to have my own implementation.

Upvotes: 0

Views: 472

Answers (2)

dave234
dave234

Reputation: 4955

The easiest way is to just change myFile.cpp to myFile.mm. Then the compiler will interpret this as Objective-C++ and you can import AVFoundation into the .mm file and use Objective-C.

Upvotes: 1

mschmidt
mschmidt

Reputation: 2790

ObjectiveC message calls are translated by the compiler into calls to the runtime library - for message calls refer to objc_msgSend. You can call this runtime-function by hand from your C++ code.

Objective-C Runtime Programming Guide / Messaging

A further - and possibly easier - way would be to port the C++ parts to Objective-C++.

Upvotes: 0

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