Qt with FB

[Stueber]

Hi,
I started to write a small wrapper for Qt and FB. I've uploaded a very early version of the wrapper >>>here<<<. It's only a demo that shows what is possible and I will translate more and more classes and functions in the next months.

Here's an example:

Code: Select all

#inclib "QtWrapper"
#include once "QMainWindow.bi"
#include once "QApplication.bi"
#include once "QPushButton.bi"
#include once "QVBoxLayout.bi"


dim as QApplication app

dim as QMainWindow main = QMainWindow()
dim as QWidget widget = QWIdget()
dim as QPushButton button1 = QPushButton("Exit")

dim as QVBoxLayout vbox = QVBoxLayout(@widget)
vbox.addWidget(@button1)

main.setCentralWidget(@widget)
main.show()


QObject.connect(@button1,"clicked(bool)",@app,"quit()")

app.setStyle("Cleanlooks")
app.exec()

The example creates a Button. If you click the Button the application will be closed.
I solved also problems with the virtual functions of QWidget, you can call the original implementation with QWidget.callDefault and "overwite" the function with a callback system (QWidget.setCallback()).
The next step will be the implementation of Signals and Slots in UDTs. (connections from Qt classes to Qt classes work already).

Thank you for any feedback!

[rdc]

Great idea for a project. This could be very useful.

[BasicScience]

Bravo. This will be a terrific addition.

I realize you are just getting started... but when I recompiled Test.Bas the warning appeared. Application ran just fine.

Compiler output:
warning 3(1): Passing different pointer types, at parameter 1 (w) of ADDWIDGET()

System:
FBIde: 0.4.7 unicode
fbc: FreeBASIC Compiler - Version 0.20.0 (08-10-2008) for win32 (target:win32)
OS: Windows XP (build 2600, Service Pack 3)

[Stueber]

I wrote a macro for this warning, you can write "vbox.addWidget(Q_WIDGET(@button1))" instead of "vbox.addWidget(@button1)"

[cha0s]

Awesome dude. Really cool getting this started, thank you!

[Sisophon2001]

Of the cross platform libraries I have seen in actual applications, I think Qt looks and behaves the best, so I think this will be very nice if you can manage to get it fully functional.

Garvan

[joseywales72]

It would be great to have QT as a GUI library to use with FB. Thank you for the effort.
Btw, I tried to compile your wrapper on Linux, but it gave these errors and quit.

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g++ -c -pipe -march=i686 -mtune=generic -O2 -pipe -Wall -W -D_REENTRANT -fPIC -DQTWRAPPER_LIBRARY -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt/mkspecs/linux-g++ -I. -I/usr/include/QtCore -I/usr/include/QtGui -I/usr/include -I. -o qtwrapper.o qtwrapper.cpp
qtwrapper.cpp:19: error: expected constructor, destructor, or type conversion before ‘(’ token
qtwrapper.cpp:25: error: expected constructor, destructor, or type conversion before ‘(’ token

I tried to run Qmake first, than issue a Make command. Also I tried it without giving a Qmake command first but no use. I also tried to change all the linefeed chars to unix counterparts.
I can compile other Qmake based apps on my PC. I'm not a C/C++ programmer so, I may be wholly wrong how to do this.
Also not a native speaker so forgive my potential mistakes too.

Anil

[Stueber]

I'm not sure, but maybe g++ doesn't support "__declsprec()". I will compile the wrapper for Linux to a .so file in the next days.

[joseywales72]

Great news... Thanks..

[Stueber]

Today, I translated the most important functions of QString and QFile. I'm working on QIODevice and QByteArray right now.
You can get it >>>here<<<

I don't forgot the linux build, but first I have to install a 32bit linux. :)

[Stueber]

Hi,
I managed to use C++ Functions of Qt in FB without any wrapper. I thought FreeBASIC can't use C++ functions. Can anyone explain why this source code is working? *LINK*
The archive includes everything needed to test the source code (DLLs, header, .a files, test programm).

Thank you in advance.

[v1ctor]

You could also do this (UNTESTED):

Code: Select all

'' QApplication.bi
extern "C++"
	type QApplication alias "QApplicationWrapper"
	 public:
	    declare constructor (argc as integer, argv as zstring ptr ptr)
	    declare destructor ()
	    declare sub exec( )
	    
	 private:
	    dim as any prt qa
	end type
end extern

// QApplicationWrapper.cpp

...

class QApplicationWrapper
{
private:
QApplication *qa = null;

public:
QApplicationWrapper( int argc, char *argv[] )
{
qa = new QApplication( argc, argv );
}

~QApplicationWrapper( )
{
delete qa;
}

void exec( )
{
qa.exec( );
}
}

It would make it easier to create the headers than using C in the C++ side, IMO. It is also way more safe than making assumptions on the C++ class sizes (the new byte[n] stuff).

[Stueber]

Your right, but how to handle with classes as parameters? I tried your example with integers and it worked but with Qpoint it doesn't work. My example works with classes or templates as parameters.

[Stueber]

Today, I was able to write a slot in FreeBASIC and connect it with a signal! I connected the slot with the clicked signal of a button and it worked. I clicked the button and the signal was emitted.

Here's the example src (~22kb): *Link*
Here's the example with dll's (~3.3mb): *Link*

[D.J.Peters]

good idea

Joshy