Thread: Any QT users out there - on a Mac?

I posted this on the QT forum. No takers over there yet.

In a nutshell, it won't compile even a basic sample, neither inside Xcode (after following the instructions in the C++ QT GUI programming book) or with Make either. I'm baffled.

Can't compile sample - Mac OS X 10.5, latest QT SDK download - Qt Centre Forum

Thanks if you can help.

Can't imagine this would be the problem, but I see you have a lowercase 'h' in "headers" here:

Code:

#include </Library/Frameworks/QtGui.framework/headers/QApplication>
#include </Library/Frameworks/QtGui.framework/headers/QLabel>

Your build line seems to have an uppercase 'H'.

Also, I've hardly ever used Qt 4, but (on Linux at least) I could always just use #include <QApplication> directly. I expect you'll be able to as well, since the qmake-generated g++ line includes a -I pointing to the Qt 4 headers.

I replaced the #includes with #includes with <QApplication> and <QLabel> and get the same error.
"Headers" now comes out with a cap "H" but that's the only difference.

Summarizing: (well, duplicating)

Hi. This is my second shot at Qt. I tried a year ago and gave up. Similar errors as now. Hopefully, I can get it working this time.

I've just downloaded the latest SDK. I'm running current Leopard. Xcode 3.1 is installed and I use it for Java, C and C++ development all the time.

For the life of me, I cannot compile the sample on page 4 of the Qtbook (C++ GUI Programming with Qt4, 2nd Edition). ("Hello QT!)

I've entered the program into a qt_test2.cpp file in a qt_test2 folder. (~/Xcode/qt_test2/qt_test2.cpp).

I run qmake while in that folder:

Code:

qmake -project

and it creates qt_test2.pro. Now, I have 2 files in /qt_test2.

Then, I run:

Code:

qmake -spec macx-xcode qt_test2.pro

and the folder now contains:

Code:

rw-r--r-- ..1 toddburch ..toddburch ..600 Sep 28 21:33 Info.plist
-rw-r--r-- ..1 toddburch ..toddburch ..293 May ..1 ..2008 qt_test2.cpp
-rw-r--r-- ..1 toddburch ..toddburch ..594 Sep 28 21:32 qt_test2.pro
drwxr-xr-x ..5 toddburch ..toddburch ..170 Sep 28 21:33 qt_test2.xcodeproj

and the xcodeproj contains:

Code:

~/Xcode/qt_test2/qt_test2.xcodeproj toddburch $ ls -l
total 40
-rw-r--r-- ..1 toddburch ..toddburch ..11269 Sep 28 21:33 project.pbxproj
-rw-r--r-- ..1 toddburch ..toddburch .. 3488 Sep 28 21:33 qt_makeqmake.mak
-rw-r--r-- ..1 toddburch ..toddburch .. 2549 Sep 28 21:33 qt_preprocess.mak

Now, I've run qmake in "project mode" and then in "make mode". There's no .app,
which I expect, as I want to compile using Xcode. In Xcode, I open the qt_test2.xcodeproj file. (Project Screenshot attached).

I then click Build in Xcode and get lots of error in code that is not mine. Here's a summary in the other screenshot.

What am I doing wrong?

(And if you can't read the attachments, blame it on the forums constraints for image size and dimensions)

And, here's the second half:

So, I don't want to use Makefiles, but I figured I would try it while waiting for an answer. Here's the result. No bueno. (Note I created a new folder and source file)

Just before this Make attempt, I entered: qmake qt1.pro

Code:

~/Xcode/qt1 toddburch $ qmake -spec macx-g++ qt1.pro 
~/Xcode/qt1 toddburch $ make
g++ -c -pipe -g -gdwarf-2 -Wall -W -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/local/Qt4.5/mkspecs/macx-g++ -I. -I/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/usr/include/QtCore -I/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/usr/include/QtGui -I/usr/include -I. -I. -F/Library/Frameworks -o moc_qapplication.o moc_qapplication.cpp
moc_qapplication.cpp: In member function ‘virtual int QApplication::qt_metacall(QMetaObject::Call, int, void**)’:
moc_qapplication.cpp:110: error: invalid use of undefined type ‘struct QApplicationPrivate’
/Library/Frameworks/QtCore.framework/Headers/qobject.h:295: error: forward declaration of ‘struct QApplicationPrivate’
moc_qapplication.cpp:120: error: invalid use of undefined type ‘struct QIcon’
/Library/Frameworks/QtGui.framework/Versions/4/Headers/qapplication.h:72: error: forward declaration of ‘struct QIcon’
make: *** [moc_qapplication.o] Error 1
~/Xcode/qt1 toddburch $ ls -l

Here's my source.

Code:

#include <QApplication>
#include <QLabel> 
..
int main (int argc, char * argv[]) {
.. .. QApplication app(argc, argv) ; 
.. .. QLabel * label = new QLabel("Hello Todd") ; 
.. .. label->show() ; 
.. .. return app.exec() ; 
}

User error? Install error? Qt error?

Here is the full build from Xcode, with errors.

Is there any chance you have a version mismatch between the Qt headers and the moc tool? Do you have multiple versions of Qt installed?

I did have QT 4.3.3 installed and it would not work, but it only
gave me 2 compile errors. So, I installed the latest download on
top of the previous release. If the install isn't smart enough to
figure that out, then that might be the issue. I'm travelling now
so I won't be able to reinstall to test until this weekend. Thanks for the idea.

Yes, QTCreator comes with the install. I can try that b4 I reinstall.