Question

I’m new to Qt, and trying to compile and run this Qt program I typed from the Programming with Qt book:

#include <qapplication.h>
#include <qlabel.h>
int main(int argc, char *argv[])
{
QApplication myapp(argc, argv);
QLabel *mylabel = new QLabel("Hello",0);
mylabel->resize(120,30);
myapp.setMainWidget(mylabel);
mylabel->show();
return myapp.exec();
}

When I do this: C:\Qt\2010.05\qt>gcc label.cc on the Qt command prompt, I get the following:

label.cc:1:26: error: qapplication.h: No such file or directory
label.cc:2:20: error: qlabel.h: No such file or directory
label.cc: In function 'int main(int, char**)':
label.cc:5: error: 'QApplication' was not declared in this scope
label.cc:5: error: expected ';' before 'myapp'
label.cc:6: error: 'QLabel' was not declared in this scope
label.cc:6: error: 'mylabel' was not declared in this scope
label.cc:6: error: expected type-specifier before 'QLabel'
label.cc:6: error: expected ';' before 'QLabel'
label.cc:8: error: 'myapp' was not declared in this scope

Why is that? Is it correct the way I did for compiling a Qt program?

Thanks.

Answer 1

Qmake can generate some default project file like this:

qmake -project
qmake
make

First line generates project file, second generates makefile from the project file and make builds the project.