LINUX用QT進行圖像顯示

由于項目需要， 需要在LINUX上将兩個攝像頭的資料同時顯示在一個最大化窗體上，實作監控。  以前都比較習慣在WINDOWS平台上用MFC或JAVA寫界面， 轉到LINUX上，隻好求取于QT大神了。 

下面是主函數源檔案

#include <QApplication>
#include "window.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Window window;
    window.show();
    return app.exec();
}
           

窗體源檔案

/****************************************************************************
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** This file is part of the examples of the Qt Toolkit.
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#include <QtGui>
#include "glwidget.h"
#include "widget.h"
#include "window.h"

//! [0]
Window::Window()
    : QWidget()
{
    Widget *native = new Widget(&helper1, this);
    //Widget *cam2   = new Widget(&helper, this);

    GLWidget *openGL = new GLWidget(&helper2, this);

    QLabel *nativeLabel = new QLabel(tr("IPCAM-1"));
    nativeLabel->setAlignment(Qt::AlignHCenter);
    QLabel *openGLLabel = new QLabel(tr("IPCAM-2"));
    openGLLabel->setAlignment(Qt::AlignHCenter);

    QGridLayout *layout = new QGridLayout;
    layout->addWidget(native, 1, 0);
    layout->addWidget(openGL,   1, 1);
    layout->addWidget(nativeLabel, 0, 0);
    layout->addWidget(openGLLabel, 0, 1);
    setLayout(layout);

    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), native, SLOT(animate()));
    connect(timer, SIGNAL(timeout()), openGL, SLOT(animate()));
    timer->start(50);

    setWindowTitle(tr("2D Painting on IPCAM-1 and IPCAM-2 Widgets"));
}
//! [0]
           

以上代碼也挺容易看懂的，跟JAVA的窗體有點相像個人覺得， 聲明了兩個Widget類， 對兩個顯示部分獨立顯示， 後面用一個架構管理容器将它們包含進去， 後面加入一個定時器，50ms去重新整理一張圖檔， 這裡有用到QT的信号與槽, 這裡是跟MFC有些不一樣的地方， MFC用的是消息映射機制， 微軟弄的一套機制， 而JAVA用的是事件響應，其實都是大同小異的， 懂其中一個，另外的都是可以融會貫通的。 

後面就不一一貼出來了，大體思路就是定時去重新整理圖檔區，我用的是QPainter的drawImage方法來進行繪圖。 有需要可以下我的工程來進行修改， 當時也隻是一個DEMO例子而已。 工程連結： 點選打開連結