Qt共享內存讀寫

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    qmemory.setKey ("zzw");

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_pushButton_clicked()

{

    QString s="zzw123";

    ui->label->setText (s);

    QBuffer buffer;

    buffer.open (QIODevice::ReadWrite);

    QDataStream in(&buffer);

    in<<s;

    qmemory.create (s.size ());

    qmemory.lock ();

    char* to=(char*)qmemory.data ();

    const char* from=buffer.data ().data ();

    memcpy (to,from,qmemory.size ());

    qmemory.unlock ();

}

void MainWindow::on_pushButton_2_clicked()

{

    if( qmemory.isAttached ()){

        QMessageBox::information(this,"info","attached");

    }else{

        qmemory.attach ();

        QBuffer nbuffer;

        nbuffer.setData((char*)qmemory.constData(), qmemory.size());

         nbuffer.open (QIODevice::ReadWrite);

        QDataStream out(&nbuffer);

        QString s;

        out>>s;

        ui->label->setText (s);

        qmemory.detach ();

    }

}