How to use Cocoa with Qt

kamkat23 · wrote on 31 Dec 2020, 19:24

As the title says, i can't import cocoa because it treats it like a c++ code. Fresh Install of Qt.

SGaist · wrote on 31 Dec 2020, 19:31

Hi,

How do you do it ?

kamkat23 · wrote on 31 Dec 2020, 19:41

In the project file, i add to the bottom "mac: LIBS += -framework Cocoa"

Second, i change my header into an objective header.

Third, i import <Cocoa/Cocoa.h>

Then 54 errors pop up.

SGaist · wrote on 31 Dec 2020, 19:42

Did you do that in a .cpp file ?

kamkat23 · wrote on 31 Dec 2020, 19:52

I turn the cpp file into .mm and turn it into a OBJECTIVE_SOURCES

the errors seem to come from Foundation which cocoa depends on.

SGaist · wrote on 31 Dec 2020, 19:54

Then link the Foundation framework as well.

kamkat23 · wrote on 31 Dec 2020, 20:03

Already tried that, the errors come from the headers and sources of Foundation.

Log

492:1: error: expected unqualified-id
@class NSString, Protocol;
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:503:50: error: unknown type name 'Protocol'
FOUNDATION_EXPORT NSString *NSStringFromProtocol(Protocol *proto) API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0));
                                                 ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:504:19: error: unknown type name 'Protocol'
FOUNDATION_EXPORT Protocol * _Nullable NSProtocolFromString(NSString *namestr) API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0));
                  ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:508:53: error: format argument not an NSString
FOUNDATION_EXPORT void NSLog(NSString *format, ...) NS_FORMAT_FUNCTION(1,2) NS_NO_TAIL_CALL;
                             ~~~~~~~~~~~~~~~~       ^                  ~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:94:49: note: expanded from macro 'NS_FORMAT_FUNCTION'
        #define NS_FORMAT_FUNCTION(F,A) __attribute__((format(__NSString__, F, A)))
                                                       ^                    ~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:509:63: error: format argument not an NSString
FOUNDATION_EXPORT void NSLogv(NSString *format, va_list args) NS_FORMAT_FUNCTION(1,0) NS_NO_TAIL_CALL;
                              ~~~~~~~~~~~~~~~~                ^                  ~
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:94:49: note: expanded from macro 'NS_FORMAT_FUNCTION'
        #define NS_FORMAT_FUNCTION(F,A) __attribute__((format(__NSString__, F, A)))
                                                       ^                    ~
In file included from ../generator/main.cpp:1:
In file included from ../generator/generatormain.h:5:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:5:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:8:
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h:9:1: error: expected unqualified-id
@class NSString;
^
In file included from ../generator/main.cpp:1:
In file included from ../generator/generatormain.h:5:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:5:
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:10:1: error: expected unqualified-id
@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:11:1: error: expected unqualified-id
@class Protocol;
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:17:1: error: expected unqualified-id
@protocol NSCopying
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:21:1: error: expected unqualified-id
@end
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:27:1: error: expected unqualified-id
@end
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:32:1: error: expected external declaration
- (nullable instancetype)initWithCoder:(NSCoder *)coder; // NS_DESIGNATED_INITIALIZER
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:32:13: error: expected ')'
- (nullable instancetype)initWithCoder:(NSCoder *)coder; // NS_DESIGNATED_INITIALIZER
            ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:231:22: note: expanded from macro 'instancetype'
#define instancetype id
                     ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:32:3: note: to match this '('
- (nullable instancetype)initWithCoder:(NSCoder *)coder; // NS_DESIGNATED_INITIALIZER
  ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:32:4: error: C++ requires a type specifier for all declarations
- (nullable instancetype)initWithCoder:(NSCoder *)coder; // NS_DESIGNATED_INITIALIZER
   ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:32:26: error: expected ';' after top level declarator
- (nullable instancetype)initWithCoder:(NSCoder *)coder; // NS_DESIGNATED_INITIALIZER
                         ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:34:1: error: expected unqualified-id
@end
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:44:1: error: expected unqualified-id
@end
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:51:1: error: expected external declaration
+ (void)setVersion:(NSInteger)aVersion;
^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:51:4: error: expected unqualified-id
+ (void)setVersion:(NSInteger)aVersion;
   ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make: *** [main.o] Error 1
22:54:28: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project generator (kit: Desktop Qt 6.0.0 clang 64bit)
When executing step "Make"

SGaist · wrote on 31 Dec 2020, 20:04

Can you share your .mm and .pro file ?

kamkat23 · wrote on 31 Dec 2020, 20:24

Project File

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp
    
OBJECTIVE_SOURCES += \
    mainwindow.mm

OBJECTIVE_HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

mac: LIBS += -framework Cocoa

mac: LIBS += -framework Foundation

.mm File

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

SGaist · wrote on 31 Dec 2020, 20:57

There's no imports in your .mm file.