程序间通信 QProcess

一个剪切板的代码
//*************************BEGIN

#include
#include
#include
#include

class My : public QWidget
{
public:
    My();
private:
    QMultiLineEdit *medit1;
    QMultiLineEdit *medit2;
    QPushButton *copy1, *cut1, *paste1;
    QPushButton *copy2, *cut2, *paste2;
};

My::My()
{
    resize(300,300);
    copy1=new QPushButton("Copy",this);
    copy1->setGeometry(10,5,40,40);
    cut1=new QPushButton ("Cut",this);
    cut1->setGeometry(55,5,40,40);
    paste1=new QPushButton("Paste",this);
    paste1->setGeometry(100,5,40,40);

    copy2=new QPushButton("Copy",this);
    copy2->setGeometry(160,5,40,40);
    cut2=new QPushButton ("Cut",this);
    cut2->setGeometry(205,5,40,40);
    paste2=new QPushButton("Paste",this);
    paste2->setGeometry(250,5,40,40);

    medit1=new QMultiLineEdit(this);
    medit1->setGeometry(5,50,140,245);

    medit2=new QMultiLineEdit(this);
    medit2->setGeometry(155,50,140,245);

    connect(copy1,SIGNAL(clicked()),medit1,SLOT(copy()));
    connect(cut1,SIGNAL(clicked()),medit1,SLOT(cut()));
    connect(paste1,SIGNAL(clicked()),medit1,SLOT(paste()));

    connect(copy2,SIGNAL(clicked()),medit2,SLOT(copy()));
    connect(cut2,SIGNAL(clicked()),medit2,SLOT(cut()));
    connect(paste2,SIGNAL(clicked()),medit2,SLOT(paste()));

}

int main(int argc, char** argv)
{
    QApplication a(argc,argv);
    My w;
    a.setMainWidget(&w);
    w.show();
    return a.exec();

}
//____________________END


这里的复制，cut　paste 键，都是和各自的edit相连，
是QLineEdit 里的函数。。



一个实现拖放功能的代码：
//*********************BEGIN

#include
#include
#include
#include

class MyDragSite:public QMultiLineEdit
{
public:
    MyDragSite(QWidget *parent);
protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);

};

void MyDragSite::mousePressEvent(QMouseEvent *event)
{
    QMultiLineEdit::mousePressEvent(event);
}

void MyDragSite::mouseMoveEvent(QMouseEvent *event)
{
    QTextDrag *drag=new QTextDrag(text(),this);
    drag->dragCopy();
    QMultiLineEdit::mouseMoveEvent(event);
}

MyDragSite::MyDragSite(QWidget *parent):QMultiLineEdit(parent)
{
   
}
class MyDropSite:public QMultiLineEdit
{
public:
    MyDropSite(QWidget *parent);
protected:
    void dragEnterEvent(QDragEnterEvent *event);
    void dropEvent(QDropEvent *event);
};

void MyDropSite::dragEnterEvent(QDragEnterEvent *event)
{
    if(QTextDrag::canDecode(event))
    {
        if(QTextDrag::canDecode(event))
        event->accept();
    }

}

void MyDropSite::dropEvent(QDropEvent *event)
{
    QString text;
    if(QTextDrag::decode(event,text))
    {
        int row,col;
        getCursorPosition(&row,&col);
        insertAt(text,row,col);
    }

}

MyDropSite::MyDropSite(QWidget *parent):QMultiLineEdit(parent)
{}

int main(int argc, char **argv)
{
    QApplication a(argc,argv);
    QWidget w;
    w.resize(500,500);

    MyDragSite dragsite(&w);
    dragsite.setGeometry(10,10,100,240);
/*
    MyDropSite dropsite(&w);
    dropsite.setGeometry(125,10,100,240);
*/                                                             //这两行屏蔽可以撤掉。。。。
    MyDragSite dragsite2(&w);
    dragsite2.setGeometry(240,10,100,240);

    a.setMainWidget(&w);
    w.show();
    return a.exec();

}
//_____________________END

当在一个对象上按左键时，mousePressedEvent()被调用,当然要是你想在这个时候做点别的事，就可以在它管辖的区域内加上相应的代码。
左键按下，移动鼠标时，mouseMoveEvent()被调用   
光标定位到接收对象上时，dargEnterEvent() 被调用。
dragMoveEvent() 见QWidget部分

书上说这里涉及到一个解码的过程 ，不是很理解。





QProcess的一个例子：

#include
#include
#include
#include
#include
#include


class Process:public QWidget
{
public:
    Process();
    QProcess *pro;

};

Process::Process()
{
    QStringList qsl;
//    QString str="./noon";
//    pro= new QProcess(str);

    qsl.append( "./c" );
    qsl+="162.105.74.15";

    pro= new QProcess(qsl);
    QDir dir("/home/wujin");

        pro->setWorkingDirectory(dir);

     if(pro->start()) printf("ok\n");
    else printf("something is wrong\n");

}


int main(int argc, char **argv)
{
    QApplication a(argc,argv);
    Process w;
    a.setMainWidget(&w);
    w.show();
    return a.exec();
}