Install QT SDK and first Hello QT program under Ubuntu

1. On the official website (http://qt.nokia.com/downloads/downloads) Download the SDK, the default recommended online installation.

Download get file Qt_sdk_lin32_online_v1_1_3_en.run

Run directly (./file name)

Select the installation directory, where I select My home directory (/home/username)

2. After installation, there is a qtsdk folder in the home directory, the folder is a QT library 4.7.4, Qt Creator 2.3.0, Qt Simulator for Symbian/meego, Qt Mobility 1.2.0, Remote All development tools such as compilers

3. Install to this end, set environment variables below. The bin directory of the integrated QTSDK is difficult to find (/home/user name/qtsdk/desktop/qt/474/gcc/bin)

sudo vi/etc/profile

In Export path= ... Continue adding content later, note separated by colons (:/above directory)

Make the configuration file effective immediately: Source/etc/profile

4. You can now use QT to write our first program.

5. Create a new QT directory under the user directory, vi hello.cpp

#include <QApplication>
#include <QLabel>

int main (int argc, int *argv[])
{
    qapplication App (argc, argv);
    Qlabel *label = new Qlabel ("Hello qt!");
    Label->show ();
    return app.exec ();
}

5. Save exit, enter the following command to generate a platform-independent project file Hello.pro:

Qmake-project

6. Then, enter the following command to generate a platform-related makefile file from this project file:

Qmake Hello.pro

7. Type the make command to build the program.

Make

8. Run the program

./hello

You can see the program run result diagram: