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I Create a MaUI project, and edit Project Properties -> Build -> Additional arguments
-cxx -gcc_flags "-L${ProjectDir}/lib -lopencv_world490, -force_load ${ProjectDir}/lib/libopencv_world490.a"
When build, it occurs error as follows:
/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk/16.4.7132/targets/Xamarin.Shared.Sdk.targets(3,3): Error: clang++ exited with code 1:> clang: error: no such file or directory: '${ProjectDir}/lib/libopencv_world490.a'
I also put the lib folder inside three places inside project, it can not work.
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Your main purpose is to get the file path in '${ProjectDir}/lib/libopencv_world490.a', right?
Please try creating a folder named "lib" in Resources. and add the .a file there.
I tested to get app bundle and go to the absolute file path, the lib folder is in it.
#if IOS
var SS = NSBundle.MainBundle;
#endif
Absolute path. You can right click the .app and show package content, then check if the .a file exists.
BundlePath "/Users/XXX/Library/Developer/CoreSimulator/Devices/XXX/data/Containers/Bundle/Application/XXX/XXX.app"
Since I cannot test the additional arguments, please test and tell me the result. Thanks for your collaboration.
Hi @Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) sorry, it not works. ${ProjectDir}/lib/libopencv_world490.a
also can not find from Resources/lib/libopencv_world490.a.
Finally, I have found the solution. You can refer to here: https://stackoverflow.com/questions/78018090/maui-clang-error-no-such-file-or-directory-when-build-ios-project.
Thanks for your sharing. I've edited the answer in order to record the solution and for the community members with similar questions to refer to.
Hello,
There is a duplicated thread on SO - xamarin.forms - MAUI clang: error: no such file or directory when build iOS Project - Stack Overflow, and you raised an issue at GitHub- using C/C++ library for iOS in maui project · Issue #20136 · xamarin/xamarin-macios · GitHub
Please follow the rolfbjarne 's comment and use $(MSBuildProjectDirectory) instead of ${ProjectDir}. For the further questions, you could continue to follow the progress at GitHub.
Update
Solution from Junior Jiang
I have found a solution to build successfully, however there will be new problem to use the method from .a library.
https://github.com/xamarin/xamarin-macios/issues/20136
Finally, we have found the cause that the .a can not be used. No matter what, replace {PrjectDir}/lib with (MSBuildProjectDirectory)/Platforms/iOS/lib works for me.
This solution based on the lib folder inside Platforms/iOS.
And if the .a related to other resource files, you will need to add these files(such as: .bundle) inside Resources/raw.
Best Regards,
Wenyan Zhang
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