willcool4ever • Qt知识点收集（二）

//获得文件对话框中的路径和文件名
QString strDir;
QString strFilename = QFileDialog::getOpenFileName(NULL,"Select file", strDir,"pic file (*.png *.jpg)");

QFileInfo fileInfo(strFilename);
strDir = fileInfo.filepath();

//右键单击,展示菜单
void MyMainWindow::mousePressEvent(QMouseEvent *ev)
{
    if(ev->button() == Qt::RightButton)
        _menu->exec(QCursor::pos());
}

//右下角托盘程序
#include <QSystemTrayIcon>
QSystemTrayIcon * _icon;
_icon = new QSystemTrayIcon;
_icon->seticon(QIcon("../main.icon"));
_icon->setToolTip("This is tray icon test!");
_icon->show();

connect(_icon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
            this, SLOT(slotActivated(QSystemTrayIcon::ActivationReason)));

void MyMainWindow::slotActivated(QSystemTrayIcon::ActivationReason reason)
{
    if(reason == QSystemTrayIcon::Trigger)
    {
        if(this->isHidden()) this->show();
        else this->hide();
    }
}

//显示网卡信息
ChooseInterface::ChooseInterface(QWidget *parent) :
    QDialog(parent)
{
    /* get all interface */
    QList<QHostAddress> addrList = QNetworkInterface::allAddresses();

    QList<QNetworkInterface> infList = QNetworkInterface::allInterfaces();

     QList<QNetworkAddressEntry> entryList = infList.at(0).addressEntries();
     entryList.at(0).broadcast()

    foreach(QHostAddress addr, addrList)
    {
        quint32 ipaddr = addr.toIPv4Address();
        if(ipaddr == 0)
            continue;
        _comboBox->addItem(QHostAddress(ipaddr).toString());
    }

}

一、Qt中的进程
#include <QProcess>
#include <QCoreApplication>
int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QProcess process;
    process.start("ssh root@1.2.3.4");
    //多参数：process.start("ssh",QStringList()<<"root@1.2.3.4"<<"-c"<<"-q"
    //也可输入参数：process.write()
    process.waitForFinished();
    qDebug() << process.readAll();
}

二、Qt中的线程
#include <QCoreApplication>
#include <QThread>
int main(int argc, char * argv[])
{
    QCoreApplication app(argc,argv);

    QThread thread;
    thread.start();

}