Compiling QT program with VS6

[Jan Spatina]

Hi,
I've got problems when trying to compile simple hello world program in vs6 using
qt3.4.0.
it's code is:

#include <qapplication.h >
#include <qpushbutton. h>

int main( int argc, char **argv )
{
QApplication a( argc, argv );
QPushButton hello( "Hello world!", 0 );
hello.resize( 100, 30 );
hello.show();
return a.exec();
}

As written in the manual, I've set env variables like this:
QTDIR set to C:\Qt\4.3.0, PATH set to C:\Qt\4.3.0\bin , C:\MinGW\bin to PATH, D:\WINDOWS\Syst em32 to PATH, QMAKESPEC set to win32-g++.

In vs6 I've set all library and include paths.

But build goes to errors (compilation is ok).

Linking...
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: virtual __thiscall QApplication::~ QApplication(vo id)" (__imp_??1QAppl ication@@UAE@XZ )
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: virtual __thiscall QPushButton::~Q PushButton(void )" (__imp_??1QPush Button@@UAE@XZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: static int __cdecl QApplication::e xec(void)" (__imp_?exec@QA pplication@@SAH XZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: void __thiscall QWidget::show(v oid)" (__imp_?show@QW idget@@QAEXXZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: void __thiscall QWidget::resize (int,int)" (__imp_?resize@ QWidget@@QAEXHH @Z)
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: __thiscall QString::~QStri ng(void)" (__imp_??1QStri ng@@QAE@XZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: __thiscall QPushButton::QP ushButton(class QString const &,class QWidget *)" (__imp_??0QPush Button@@QAE@ABV QString@@PAVQWi dget@@@Z)
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: __thiscall QString::QStrin g(char const *)" (__imp_??0QStri ng@@QAE@PBD@Z)
main.obj : error LNK2001: unresolved external symbol "__declspec(dll import) public: __thiscall QApplication::Q Application(int &,char * *,int)" (__imp_??0QAppl ication@@QAE@AA HPAPADH@Z)
Release/main.exe : fatal error LNK1120: 9 unresolved externals
Error executing link.exe.

What does this error mean, and how to fix it?
The same problem has allready been solved here: http://www.qtcentre.or g/forum/f-installation-5/t-ms-visual-studio-6-problems-3388.html , but without a good conclusion.

If you had some ideas to help, it would be good.
thanks
-jan

[Banfa]

I imagine that Qt whatever it is comes with some libraries (qt.lib??) and it appears that you have not included these as inputs to you linker.

Open the project settings, goto the Linker tab and add the additional libraries you require that contain the binary code for these classes.

[Jan Spatina]

There are no lib's in my installation. There only *.a and *.prl files. I am not sure if they can be somehow linked to VS?

-jan

[Banfa]

There are no lib's in my installation. There only *.a and *.prl files. I am not sure if they can be somehow linked to VS?

-jan

OK well .a is a common extension for libraries on any non Windows system so it might be that, however there will either be some binary libraries as part of the install somewhere or there will be cpp files that contain the implementation of the classes that you can compile.

You should check the package documentation.

The .prl file is most likely a perl file to perform some function.


Given the existence of a .a file are you sure that this package was realsed to work on the Windows platform?

[Jan Spatina]

Thanks Banfa, you were right. Problem was in wrong versing of QT installed. It was "open source version". I reinstalled to "Academic/research" and now everything works fine.