Category Archives: qt

Qt – How to change build output folder in project

this is a way to change Qt output folder in .pro file.

1
2
3
4
5
CONFIG(debug, debug|release) {
    DESTDIR = ../debug
} else {
    DESTDIR = ../release
}

it will output folder into parent folder of the project

Qt-Config

Qt – ListView SetModel tip

when developing qt, QStringList should be display on ‘ui->listView’, However, following code won’t work.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
...
    QDir myDir("C:\\");
 
    QStringList filter("*");
    QStringListModel model;
    QStringList filesList = myDir.entryList(QStringList(filter),QDir::Files | QDir::Dirs);
    model.setStringList(filesList);
    ui->listView->setModel(&model);
...
}

because ‘model’ object will be delete after function is done.

ui->listView will not be able to get model object.

move to MainWindow ‘model’ to MainWindow declare will be good.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QStringListModel model;
private:
    Ui::MainWindow *ui;
};
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
...
    QDir myDir("C:\\");
 
    QStringList filter("*");
 
    QStringList filesList = myDir.entryList(QStringList(filter),QDir::Files | QDir::Dirs);
    model.setStringList(filesList);
    ui->listView->setModel(&model);
...
}