Qt does not recognize objective-c header files?

senmx

Keywords like "@protocol" and "-(void)..." will prompt errors, but writing to the .m file is no problem.

#import <Foundation/Foundation.h>
#import <StoreKit/StoreKit.h>

@protocol ToolDelegate <NSObject>

-(void)ToolSysWrong;
-(void)ToolGotProducts:(NSMutableArray *)products;
...

SGaist

@senmx said in Qt does not recognize objective-c header files?:

@SGaist Tks. So objective-c code can only be typing in .mm files. .h or .cpp are considered standard C++ code?

No, pure Objective-C is written in .m files. If you want to mix Objective-C and C++, use the .mm extension.

.cpp, .cxx are extensions for C++.

You can check the content of the QtMacExtras module for simple examples on how to write Objective-C++.

ChrisW67

I assume you mean that your source code generates errors/warnings when your compiler sees it, because Qt is a library: it does not "recognize" the C++/Python/whatever source code of your program logic. Errors and warnings would not be surprising if you are feeding something that is not C++ or C to a C++ compiler.

Perhaps you could share your project file and some hints about the error/warning?

sierdzio

Are you adding .m files to OBJECTIVE_HEADERS and OBJECTIVE_SOURCES in your .pro file?

https://doc.qt.io/qt-5/qmake-variable-reference.html#objective-headers

SGaist

Hi,

Are you trying to put that in a .cpp file ?

If so that's normal, this is not valid C++.

If you want to do Objective-C++ (mixing Objective-C and C++ code) then you have to write a .mm file.

Depending on your version of Qt you have to put these files under "OBJECTIVE_SOURCES" in your .pro file.

Depending on the framework you use, you also need to add the proper information to the LIBS variable.

senmx

@SGaist Tks. So objective-c code can only be typing in .mm files. .h or .cpp are considered standard C++ code?

senmx

@sierdzio Tks, this is added.

senmx

@ChrisW67 Tks. Objective-C and C++ can be mixed originally, the problem only how mixed them.

SGaist

@senmx said in Qt does not recognize objective-c header files?:

@SGaist Tks. So objective-c code can only be typing in .mm files. .h or .cpp are considered standard C++ code?

No, pure Objective-C is written in .m files. If you want to mix Objective-C and C++, use the .mm extension.

.cpp, .cxx are extensions for C++.

You can check the content of the QtMacExtras module for simple examples on how to write Objective-C++.