Qt: Qt的一些solution, 如程序只有单个实例等

Qt: Qt的一些solution, 如程序只有单个实例等

http://qt.nokia.com/products/appdev/add-on-products/catalog/4

在single application中, main函数里很奇怪, 要有一个能产生moc的类才行, 继承一个QTextEdit, 然后使用Q_OBJECT, 生成main.moc, 在#include "main.moc", 就可以了.

#include <qtsingleapplication.h>

#include <QtGui/QTextEdit>

class TextEdit : public QTextEdit

{

    Q_OBJECT

public:

    TextEdit(QWidget *parent = 0)

        : QTextEdit(parent)

    {}

public slots:

    void append(const QString &str)

    {

        QTextEdit::append(str);

    }

};

#include "main.moc"

int main(int argc, char **argv)

{

    QtSingleApplication instance(argc, argv);

    if (instance.sendMessage("Wake up!"))

return 0;

    TextEdit logview;

    logview.setReadOnly(true);

    logview.show();

    instance.setActivationWindow(&logview);

    QObject::connect(&instance, SIGNAL(messageReceived(const QString&)),

    &logview, SLOT(append(const QString&)));

    return instance.exec();

}