The right way to use Objective C++ and Qt
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Hi everybody. I have to implement NSString in my program.
In order to use NSString I have created a header file and a mm file. See below:@#ifndef A_H
#define A_H#import <Foundation/NSString.h>
void CanTry();
#endif A_H@
The mm file
@#include "a.h"
void CanTry() {
}@the .pro file
@OBJECTIVE_HEADERS += a.h
OBJECTIVE_SOURCES += a.mmLIBS += -framework Foundation@
but I still obtain the error:
unknow type name NSString NSObjRuntime.h
unknow type name Protocol NSObjRuntime.h
...What I have missed?
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Hi,
The idea is basically to avoid having any Objective-C element in the header you want to use with pure C++ code. You create an interface and only use Objective-C code in the implementation.
Hope it helps
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As SGaist said;
In your program (C/C++) you need to include a.h so the program knows about CanTry() but you can't simply include an Objective C header into C/C++.
To make your simple example work, make a.h a simple C header by moving the #import to the .mm
This is nothing to do with Qt.
