Qt Interface Authoring Process record

The key to QT is the signal and slot mechanism.

1. Create QT widgeets Application project with Qtcreator

Main.cpp mainwindow.cpp mainwindow.h file. UI interface Design File

#include "mainwindow.h" #include <QApplication> #include <qpushbutton>int main (int argc, char *argv[]) {    qapplication A (argc, argv);    MainWindow W;    W.show ();    return a.exec ();}

Qapplication  MainWindow   

2. Open the Mainwindows.ui interface file Design interface: Add a label to display the picture

3. Compile once, the Ui_ mainawindows.cpp file is generated under the build folder. interface-related UI classes

Qlabel *labelimage;

4 Writing of mainwindow.h files

1) Corresponding member and member functions

    Qimage qimg;    Qpixmap pm;    Cv::mat img_test;    int id1,id2,id3;      cameraestimation* pcam_qr_estimation;    void Init (char* addr,int camId);    Qimage mat2qimage (Cv::mat const& src);    Cv::mat Qimage2mat (qimage const& src);p rotected:    void TimerEvent (Qtimerevent *event);

2) Signal

Signals:    void ImageReady ();

3) Slot function

    void Imgshow ();

4 Writing of Mainwindow.cpp files

1) correlation signal and slot function Qobject::connect

UI->SETUPUI (this);  UI starts//turns on a 1-second timer and returns its id ID1 = Starttimer (50); Qobject::connect (this,&mainwindow::imageready,this,&mainwindow::imgshow);

2) Signal Release

        Emit ImageReady ();

Timed Event Trigger release signal

void Mainwindow::timerevent (Qtimerevent *event) {    //determine which timer    if (event->timerid () = = Id1)    {        Qdebug () << "timer1";        Pcam_qr_estimation->run ();  OpenCV the operation of some columns         pcam_qr_estimation->pqrdetect_->t_[0];        qimg = Mat2qimage (pcam_qr_estimation->frame);        Img_test = Qimage2mat (qimg);        Emit ImageReady ();    }    else    {        qdebug () << "Timer Erro";    }}

3) The implementation of the slot function: Displays the picture in the Labelimage.

void Mainwindow::imgshow () {    //qimg.load ("/home/yhzhao/desktop/12.png");    Ui->labelimage->setpixmap (Qpixmap::fromimage (qimg));    Qdebug () << "Tigger";}

5) project has a thumbnail, running results such as.

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Qt Interface Authoring Process record