Qt program freezes every time

Question

I'm making a C++ GUI program in Qt using qtcreator its not complete yet but when ever I build and run to test the program it runs then if i click buttons that open a file or write something in a file, the button does that and then the program freezes. Why this happens, What I'm doing wrong or what's the issue.

It mainly freezes in theses two functions:

    void MainWindow::on_kmpOpenButton_clicked()
{
    QString kmplayerloc = "\"F:\\Program Files\\The KMPlayer\\KMPlayer.exe\"";
    QProcess::execute(kmplayerloc);
}

void MainWindow::on_nbopenbutton_clicked()
{
    // Remember tha if you have to insert " in a string  \"....location of file or anything u want to put.......\"
    QString netbeansloc = "\"F:\\Program Files\\NetBeans 7.4\\bin\\netbeans.exe\"";
    QProcess::execute(netbeansloc);
}

Answer 1

From the documentation

Starts the program program [..] in a new process, waits for it to finish , and then returns the exit code of the process.

The calling thread freezes until the external process is finished. If you don't want this, use the method start or startDetached .