Mixing Cpp and ObjC - Memory Leak in ARC
Mixing Cpp and ObjC - Memory Leak in ARC
- Subject: Mixing Cpp and ObjC - Memory Leak in ARC
- From: Hado Hein Applelists <email@hidden>
- Date: Sun, 27 Nov 2016 17:40:39 +0100
- Authentication-results: symauth.service.identifier
Hoi,
I have to use a SDK that is written in cpp.
Since I have to include the .hpp header of the SDK I also had to switch my AppDelegate.m to .mm
I’m using ARC.
Now I have another cpp source file that makes use of this SDK. It defines a cpp class which also works.
In some callback of the class I need to call out to my AppDelegate.
> HRESULT DeckLinkCaptureDelegate::VideoInputFrameArrived(IDeckLinkVideoInputFrame* videoFrame, IDeckLinkAudioInputPacket* audioFrame)
But this eats memory. First I did it in a direct call on my
> [iter setAvgColor:[NSColor colorWithRed:r green:g blue:b alpha:1]].
This produced a ~1MB per second memory leak.
Then I went to:
> dispatch_async(dispatch_get_main_queue(), ^{
> [iter performSelectorOnMainThread:@selector(setAvgColor:) withObject:[NSColor colorWithRed:r green:g blue:b alpha:1] waitUntilDone:YES];
> });
Which brought down the leak to <100kB/sec. But it’s still there.
Then I tried not to allocate a Foundation Object in the cpp code and tried:
> [iter setAvgColorWithR:r G:g B:b];
and allocating the NSColor in the source of my iter-objc-class.
This didn’t work either.
Now I’m wondering what I’m doing wrong.
The class cpp does not contain any obj-c code or objects. It just includes the AppDelegate.h for calling out.
Unfortunately, when I turn on Malloc Debug Functions in Xcode the thing does not compile anymore. So I’m a bit lost on how to find the exakt position of the leak and on how to implement this correctly. I assume that this might have to do something with using a Foundation constructor In cpp code which doesn’t arc correctly.
Thx, Hado
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