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.

you should summarize it here and post the pics here, because frankly, im not interested in spending the time it takes to register at a site I will never go back to.

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

Code:

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#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:

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qmake -project

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

Then, I run:

Code:

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qmake -spec macx-xcode qt_test2.pro

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and the folder now contains:

Code:

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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

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and the xcodeproj contains:

Code:

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~/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

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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:

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~/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

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Here's my source.

Code:

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#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() ;
}

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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.

You could try using Qt Creator, which they probably have for Mac OS X. If projects in that don't work, then something got screwed up during install or something.

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