Hi,

I've installed QDevelop on Ubuntu 8.10, but am struggling to get anything working. If I create a new (blank) project, then select to add a new source file, I get the error message "unable to create file". I've tried several variations, and also creating other project templates (such as application with dialog) but always get the same error when I try to create new source files myself. Any ideas gratefully received.

Thanks,

Ed

Hi,

This is a great tutorial for beginners.

I would like to know if we can call an other Dialog while we are on an another dialog box..using the designer.
???

I am new to qt!!!!!!!!!!!

Thankyou..

hi got the token thing fixed but now im having trouble with lineEdit being undeclared, any ideas??

hi there,
In file included from main.cpp:3:
myqtapp.h:8: error: expected class-name before '{' token

ive tried all kinds of things but nothing works im new to this so if anyone can help?
thanks

It is very good beginning so far.
Will send more comments after going through the rest of it.
Choice of 911 is an excellent idea, as it connects an abstract thing like programming
with a concrete attention catching event.

Thank you Sector for such a wonderful Qt class.
Please create a book or pdf that we can purchase
from you! you deserve to earn some $$ for your
fine information.
thank you,
Ken - USA

hi! great tutorial. it would be nice if one could download the whole tutorial as a zip archive or a pdf or similar. bafta!

Great job, i learned basics of QT4 well, thank you for nice tutorial.

hi,
great tutorial and i learn a lot with it...

I'm glad you like it. I currently do not work with Qt very much but I'm happy that people find this piece useful.

I just want to tell you that this is the most informative and helpful qt tutorial I've ever seen. Thanks a million.

QwebView is not in 4.1, http://doc.trolltech.com/4.1/classes.html
but it is in 4.4, http://doc.trolltech.com/4.4/classes.html

hi:
have you use qwebview before.? I have add QwebView, I compile, I got error.
I use windows xp system
mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Yalin/test/Qt4'
C:\Qt\4.1.1\bin\uic.exe cibGui.ui -o ui_cibGui.h
........................
I"C:/Qt/4.1.1/mkspecs/win32-g++" -o debug\cibGui.o cibGui.cpp
In file included from cibGui.h:4,
from cibGui.cpp:2:
ui_cibGui.h:16:29: QtWebKit/QWebView: No such file or directory
In file included from cibGui.h:4,
from cibGui.cpp:2:
ui_cibGui.h:41: error: ISO C++ forbids declaration of `QWebView' with no type
ui_cibGui.h:41: error: expected `;' before '*' token
ui_cibGui.h: In member function `void Ui_cibGuiForm::setupUi(QWidget*)':
ui_cibGui.h:135: error: `webView' undeclared (first use this function)
ui_cibGui.h:135: error: (Each undeclared identifier is reported only once for each function it appears in.)
ui_cibGui.h:135: error: `QWebView' has not been declared
In file included from cibGui.cpp:2:
cibGui.h:23:7: warning: no newline at end of file
cibGui.cpp:51:2: warning: no newline at end of file
mingw32-make[1]: *** [debug\cibGui.o] Error 1
mingw32-make: *** [debug] Error 2
thanks

Hi,

strange, never seen error like this. I currently have qt 4.4.0 Win, self installing package from Trolltech and my_first_qt_app compiles with no problem. Try latest qt, I have no idea why this error pops up.

Hello:

I try to build a test project following your tutorial. I got a error.
mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Yalin/test/Q4'
g++ -c -g -g -frtti -fexceptions -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB
tGui" -I"C:/Qt/4.1.1/include" -I"C:/Qt/4.1.1/include/ActiveQt" -I"debug" -I"." -I"C:/Qt/4.1.1/mkspecs/win32-
cibGui.cpp: In constructor `cibGui::cibGui(QWidget*)':
cibGui.cpp:8: error: no matching function for call to `cibGui::setupUi(cibGui* const)'
ui_cib_Qt4.h:47: note: candidates are: void Ui_CibWindow::setupUi(QMainWindow*)
mingw32-make[1]: *** [debug\cibGui.o] Error 1
mingw32-make[1]: Leaving directory `C:/Yalin/test/Q4'
mingw32-make: *** [debug] Error 2
thanks

Thank you very much for the tutorial!

Hello all,

thanks for all comments.

No problem with using tutorial in teaching, all I ask is to put there URL somewhere, where it did come from. There is no printer friendly version but I think it can be printed directly from web and result will be quite OK.

Cheers all.

I am interested in using your tutorial in a class I am teaching. Is that ok, and is there a printer friendly version of it?

Hello sir, Great Tutorial i must say, Really

Very useful. Thanks.

Great tutorial, thanks a thousand times!

Thank you for writing the "My First Qt GUI Application" tutorial. It was very helpful in getting a grasp on what QT is all about. I have some programming experience, but this was my first time working with GUIs.

what is the code??

thanks.

how to open another page from the main window???

Hey this is avery good material!!! Thanx

The make command leads to the error below

C:\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\mingw32\bin\ld.exe: cannot fin
d -lQtGuid4
collect2: ld returned 1 exit status
mingw32-make[1]: *** [debug\menus.exe] Error 1
mingw32-make[1]: Leaving directory `C:/Qt/4.1.4/examples/mainwindows/menus'
mingw32-make: *** [debug-all] Error 2

Now i get this error:

In file included from main.cpp:2:
myqtapp.h:8: error: expected class-name before '{' token
In file included from main.cpp:2:
myqtapp.h:23:7: warning: no newline at end of file
main.cpp:11:2: warning: no newline at end of file
mingw32-make[1]: *** [release/main.o] Error 1
mingw32-make[1]: Leaving directory `C:/c++/Qt/me-design'
mingw32-make: *** [release] Error 2

It doesn't work for me...make shows this error:

myqtapp.h:4:24: ui_myqtapp.h: No such file or directory
In file included from main.cpp:3:
myqtapp.h:7: error: `Ui' has not been declared
myqtapp.h:8: error: expected class-name before '{' token
myqtapp.h:8: error: invalid use of undefined type `struct QWidget'
../../../Qt/4.4.0/include/QtCore/../../src/corelib/kernel/qobject.h:71: error: f
orward declaration of `struct QWidget'
main.cpp: In function `int qMain(int, char**)':
main.cpp:10: error: 'class myQtApp' has no member named 'show'
mingw32-make[1]: *** [release/main.o] Error 1
mingw32-make[1]: Leaving directory `C:/c++/Qt/design'
mingw32-make: *** [release] Error

So thanks

hi!I'm very interested in this section.

to James Redin:

Hi, just locate that dll (ie. in your C:\Prog.. Files\MinGW) and copy to directory where your program executable is on other machine, it will be ok then.

I'm developing a calculator application under QT 4.1.1. Found that the executable program only runs in the Windows PC I used to compile the program.

When I try to run in another PC it complains that the the mingwm10.dll is missing.

Can you give me some advice?

Thanks!
James Redin
http://www.xnumber.com

Dude i didnt understand how to compile, it is suppose to use uic to make .h file not copy paste from a tutorial every time i need something.

Neither says how to use the implementation to create the c++ file.

Remember absolute beginner.

Nice, Thanks very much. this is a very good tutorial for beginner. It solved many problems I've met. Really appreciate:)

Great!

Cool tutorial dude! Just what I was looking for.


Uncovering 911 is the starting point and the key to freeing humanity from blind submission to religion and taking authority as truth. Watch 'Esoteric Agenda' and 'Zietgiest'.

Thank you for the tutorial, I really wanted to learn how to use the code that is generated by the UIC and this tutorial did just that. Thanks again. :)

Good tutorial,,

thanx.

this tut sucked!, first that motherfucking make of qt never completed (several days)
second, when i saw on page 2 that you want me to do it the motherfucking graphical way. NO DAMN WAY!!, i want to learn how to CODE!!!

Thank you for such a tutorial that's easy to understand (relatively).

I had a few bugs on the way, had to change my uic and qmake links to uic-qt4 and qmake-qt4, that made things better. (that honestly did take me a while to figure out >.<)

Though I think that helps to understand better

this is a really good step towards Qt-literacy. (at least it seems to me, this is the first time I've opened a window in C++ w/ an X11 environment. I'm more familiar with Java, and have been spoiled by Swing. :P .Thanks again

p.s. Ok, so the author had a few small links to his 9/11 page. so? I think putting up with a small green box is more than a good deal for a tutorial...

Please, keep your politics separate from your computer help. A simple link to your site about 9-11 will do.

> Please do not advice me what to do.

Excellent material!

Thank you!

brilliant tutorial!!!

thanks a ton

Hi friend its really a nice tutorial for the biginners, but(My first Qt GUI application)
is not comipiling in linux(Qt4.3.2) and it giving error as below, any suggesions.....
***********************************

[sudheer@localhost filebrowser6]$ qmake filebrowser6.pro
[sudheer@localhost filebrowser6]$ qmake
[sudheer@localhost filebrowser6]$ make
g++ -c -pipe -Wall -W -O2 -g -pipe -m32 -march=i386 -mtune=pentium4 -DQT_NO_DEBUG -DQT_SHARED -DQT_THREAD_SUPPORT -I/usr/lib/qt-3.3/mkspecs/default -I. -I/usr/lib/qt-3.3/include -I.ui/ -I. -I.moc/ -o .obj/main.o main.cpp
In file included from main.cpp:2:
files.h:9: error: `Ui' has not been declared
files.h:10: error: expected class-name before '{' token
make: *** [.obj/main.o] Error 1

Brilliant tut, just awesome... please Keep on writing even better tuts... good luck!!!

Good work! I'm using qt-4.3.1 with mingw 3.4.5 You need to make one modification in myqtapp.h, Ui::myQtAppDLG become Ui::myQtApp, according ui_myqtapp.h

Very helpfull.
Good work.

hi
I m using QT 4.1.1 and facing many problems like
1.How to submit the string from TextBoxes into the database.
2.IDE available or notepad is only code Editor
etc

Great job. And thx for information about 911 they're very interesting.

Could we avoid to read 911 crap every two pages on the intrnet ?
I don't think it's more ridiculous than discussion about the sex of angels of the middle ages... So feel free to spend your time as you want
But, please Could you please keep it in a separate page.

Hey,

Your tutorial is very helpful. Good examples and links.

Hi,
Compiled "My first Qt GUI application" with qt 4.3.0 without a problem.

Just mentioning that you forgot a few links :
* Edyuk (IDE for Qt 4) : http://edyuk.org
* Cobras (yet another IDE for Qt 4) : http://beesoft.org/cobras.html
* QtNode (wiki and IRC channel) : http://qtnode.net
* QtFr.org (french "equivalent" of QtCentre : forum, wiki, news, ...) : http://qtfr.org

there are probably even more but these are by far the most useful IMO.

Ok, Here is an EASY thing to miss under Linux: 1) Run qmake -project to generate project 2) Run qmake AGAIN to generate Makefile 3) Now run make to compile application.

Failing one of these step will give you the "undefined reference to vtable" kiss of death.

Also, the setupUi(this) requires a QMainWindow*, so either Qt Designer can cast it to a QWidget Class or you must labor to make your mainwindow derive directly from QMainWindow instead of QWidget as show in the examples.

Typecasting causes segfault. setupUi( (QMainWindow*) this) ; ---> segfault!

Nice Tutorial. Now I need to have a integrated IDE so I don't waste time with gdb commands. Have gotten spoiled on syntax highlighting while in debugger.

Cheers,

md

Durgesh:

I have unfortunately never used Qtopia, so I'm unable to give any links/recommendations about it.

I found your tutorial very nice but its not for what i needed(its for desktop application ),I m very new be to the Qtopia and want to develop the application for embedded system means a application which run on Mototrola hand set which have Linux OS.I downloaded the Open source Qtopia 4.2.2 and build it and I m using the fedora core 7 linux.Also read the doc comes with it but not understand from where to start.So i want the information regarding how do i start working with Qtopia4.2.2 and Qt4 to design the embedded application.Do u have any link for ,Tutorial like yours which show me how to start with hello word application and have some nice example to develop the application for the embedded system using qtopia and even have how to configure the Qutopia for embedded devices ,I could not understand the docs come with Qtopia and their flow.

Thanks

Qt 4.2.3 Runtime Installer for windows:
http://c9s.blogspot.com/2007/06/qt-runtime-installer-for-windows-full.html

Jessica

This is how it's possible to list all DLLs needed to run qtapp under Windows. You can use same trick in linux.

F:\qt\my_first_qt_app\release>objdump -p myqtapp.exe | grep DLL
vma: Hint Time Forward DLL First
DLL Name: KERNEL32.dll
DLL Name: mingwm10.dll
DLL Name: msvcrt.dll
DLL Name: QtCore4.dll
DLL Name: QtGui4.dll

On windows you need these files: mingwm10.dll QtCore4.dll QtGui4.dll

On linux I think you will need these .so files:
QtCore4.so
QtGui4.so

Be sure to make release binary -> "make release", not debug. Run app from console (./myqtapp) to see error messages. Placing binary and libraries in the same directory should work. If not, place libs to /usr/lib or /usr/local/lib.

Hello sector,
Sincerely thank you, I will try these solution, could I ask how to copy all files needed to run my app with my binary? Only place my binary and library needed in the same directory? I am interested in the (2) item. Thank you ^_^

Roberto: thanks

Jessica

Sorry, I forgot about this forum for a while.

You have to:
1) compile Qt4 distibution on your B linux machine
2) copy all files needed to run your app (like libQtGui.so.4) with your binary (I'm not sure if this really works on linux, but on windows it does)
3) build static binary (all that .so are packed into single binary file, you have to specify that what you are compiling Qt4)

Great!!! I have learned How to programming using Qt4 reading your tutorial.
A very nice tutorial for beginners.
Good Work!!!

Hi,
I have compiled successfully a file with Qt4.2 in A machine of linux but I copy that file to B machine of linux that is installed Qt3.1, It can not work and show message "error while loading shared libraries:libQtGui.so.4". I don't know what happend. Could you help me, please? Are there any suggestion? Thank you..

Judy:

I'm rather busy right now, maybe I will later. You can have a look at this QMainWindow example from Qt sources -> QTDIR\examples\mainwindows\menus, it's simple, not UI, but once you see it, you'll surely know how to convert ie. My first Qt GUI application to QMainWindow.

schuyler:

No problem. You're welcome.

Hi sector,
Thank you for your answer and examples, you are right!
Thank you again.

It is a best tutorial.
Could you add the simple example of QMainWindow ?^^
thank you.

Adam7:

Thank you. I made this tutorial exactly like the one I wish I had available when I was starting with qt4.

George:

His problem solved by email - he was trying to use commercial qt version, this version doesn't support make/gcc (aka MinGW) but needs MS nmake and MS compiler instead (tools bundled with visual studio).

Great tutorial, You truly know, how make an interesting tut.
Keep on writing other tuts !
Good luck !

hi sector ,
the tutorial is great but it doesnt work for me yet!
i try to do "my first qt GUI application" and when i call make i get the following:
C:\Qt\4.1.4\bin\1>make
mingw32-make -f Makefile.Debug all
Makefile.Debug:64: *** missing separator. Stop.
mingw32-make[1]: Entering directory `C:/Qt/4.1.4/bin/1'
mingw32-make[1]: Leaving directory `C:/Qt/4.1.4/bin/1'
mingw32-make: *** [debug-all] Error 2
i have all the files of the project in a folder named 1 in the bin dir. i got the .pro file using qmake but i cant get the .exe file
Can you plz help me because i have a project due for school and i cant find nothing online for this problem.
thank you very much in advance!

Hi,

I've put there (How to read Qt documentation, basic concepts) zipped sources of that example with custom slot/signal and some words to clarify, check it out.

I suspect you haven't define that slot "mySlot" and you are trying to connect signal to it.

Dear sector,
When I practice examples of "custom signal" in the "How to read Qt documentation, basic concepts", the definition of custom signal does not work.
But examples of "custom slot" can work.
I have no ideal about this. Please help me. Thanks.
My action is below.
-------------------
a) Added below section into myqtapp.h
signals:
void customSignal( const QString& );

b) Added below section into clear() in myqtapp.cpp
emit customSignal( textEdit->toPlainText() );

c) Added below section in constructor myqtapp.cpp
connect( this, SIGNAL( customSignal (const QString&) ), this, SLOT( mySlot(const
QString&) ) );

It is the best tutorial and help me to understand Qt4.
You are the chosen one.
Thank you a bunch.

Fantastic Tutorial, much better than the TrollTech examples. The QT4 examples don't show how you get from the .ui file to the finished code.

I absolutely love you. The docking preference, is for gurus like you. THANX

Hi,
thanks for this tutorial. It's the best tutorial on Qt I have seen. It helped me a lot.

Happy cross-platform programming.

Very nice tutorial, the Drag and drop examples were really useful.

Hi Mahesh,

Thank you for feedback.

QT designer is just a tool for creating user interfaces (.ui) files, there is no way to get "executable from something done in Qt designer". You need code for your form/dialog to work, and compile it, like it's done in My first Qt GUI application. Actions,.. some hints about actions can be found here http://doc.trolltech.com/4.2/mainwindows-application.html, that might help you.

Have a nice day.

Hi
I like your tutorial,but i have question that the app created with QT designer how to compile it or create executable for it?
I'm trying to create simple text editor with it i dont know how to add actions to it?Please post some tutorials related to the QT designer.You are doing great job keep it up.

Cheers mahesh.

Thank you.

I cleared that point a little bit, adding

MinGW:
"Your PATH environment has to contain i.e C:\MinGW\bin (or whatever path your MinGW/bin is located) in order to proceed."

Qt:
Make also sure you have MINGW\bin (i.e C:\MinGW\bin) added to your path.

Hope nobody will get stuck on this anymore.

Have a nice day.

Hello. Awesome tutorial. BUT I got stuck on the first page. I am a total noob and followed your tutorial very carefully. on this page
http://sector.ynet.sk/qt4-tutorial/preparations.html
The part when you set your variables. PATH QMAKESPEC and QTDIR. I had a probelm here. I dont think QT4 automatically inserts the path to mingw. I had to do this myself. SO of you could please add this to the tutorial PATH C:\MinGW\bin

After I added this line. I could use the configre cmd and use make command. Thanks

Thanks a lot for your time dedicated in preparing this tutorial.

Its really good for Qt4 beginners.

Regards,
Business Systems Analyst
M+R SPEDAG (Uganda) Ltd
+256-752-465557

Thank you very much!!!
I have spent weeks trying to work all this out and had all but given up.... your tutorial really has saved the day.
Finally I can create an application using qt4 and C++.
Thanks again.

thanks for ur work...

tested on ubuntu 6.10 (with KDE & designer-qt4), that zipped file works ok ( i almost gave up of tutorial if i havent tried that zipped file)

http://sector.ynet.sk/qt4-tutorial/tutorial/my-first-qt-gui-application/my_first_qt_app/my_first_qt_app.zip

thanks again, and i will probably check and the other chapters of this tutorial...

aldin@edgyson:~$ uname -a
Linux edgyson 2.6.17-10-386 #2 Fri Oct 13 18:41:40 UTC 2006 i686 GNU/Linux
aldin@edgyson:~$

Very good tutorial. That's the best tutorial I've ever found on the web !
Go on this way :)

Very useful tutorial to get statred with QT.
Thnaks.

thanks...

Great Site for getting started with Qt4!
Thanks for your effort!
Greetings from Germany

Thank you all guys for positive feedback, I really appreciate it.

Excellent tutorial ! Thanks very much.

I suggest everyone using Monkey Studio Qt IDE, it's better than QDevelop.
Free and Open Source

http://sourceforge.net/projects/monkeystudio/

Thanks you write this tutorial.

Hi :)
I am french and was looking for a starting qt4 tutorial...
I found your tutorial on qtfr and was very pleased as they are really few examples
converting qt3 and qt4 is not really a pleasure...
So i like your work... And specially you put the sources : when they is a problem
we can first see if it compiles on our pc ...
thanks for this wonderfull time of yours
cheers
Henri

I found it by using Google and searching for "qt4 tutorial"

to azark:

Thank you, so nice to hear this. By the way, how did you find this tutorial ?

Great tutorial (I wish more were like it!) -- haven't been through all of it, but your example and explanations in Part 2 were just what I needed to get things rolling. I usually learn better from seeing examples of code, and your clear explanations completes the process. Keep up the good work!

Don

to Lucjan:
Thank you very much for positive feedback.

Very nice tutorial!
The first which I have understood :)
I'am using mingw and your tut is very good for me.
Keep your work, please.

to amit:
Hello,
formulation of your problem is very unclear, and english is hard to understood..
My advice is to describe what you want in a clear way and nice english (include also your sources) and post to http://www.qtcentre.org forum, there are many people willing to help (including myself).
If you don't stick with Qt3, install Qt4 and use this tutorial.
Correct Qt integration into KDE, that is something I can hardly help you with, never done this.

Regards.

helo sir how r u
i m amit from pune city india.
i sorry i m mailing u even i dont know u but whn i searching info regarding QT in group i see yr mail id.
actually i m using kde-2.1 and qt-3.3.0 for my project.
i m designing my GUI IN QT for that i creat one project file nsgui.pro after that i m creating some files. then i m compiling the project file.
after that i m adding this .ui ,.h and .cpp files inot my kde project.
but it ddint integrate gui
can u tell me how to do inegrate qt and kde in correctly way. i m new in this field.
i try hard but ddint get any help from group
plz if u know then let me know step by step
Thanks and Regrds,
Amit

Use new link http://sector.ynet.sk/qt4-tutorial/
Automatic redirect should already work

Pages not Found!!!