#include<QCoreApplication>
#include<QDebug>
#include<QTextStream>
int main(int argc, char*argv[]) {
QCoreApplication a(argc,argv);
qDebug()<<"PleaseKeyIn:";
qDebug()<<"----------------------------";
while(1){
QTextStream qtin (stdin);
QString line = qtin.readLine();
qDebug()<<"KeyIn:"<<line.toStdString().data();
}
return a.exec();
}
*.pro 文件加入：
QT += core gui multimediamulti mediawidgets
------------------------------------------------------------------------
mainwindow.h 檔案：
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QCameraImageCapture>
#include <QCameraViewfinder>
#include <QCamera>
#include <QTimer>
#include <QImage>
#include <QDebug>
#include <QFile>
namespace Ui{
class MainWindow;
}
class MainWindow : public QMainWindow {
Q_OBJECT
public:
explicit MainWindow(QWidget*parent=0);
~MainWindow();
private:
Ui::MainWindow*ui;
QCameraImageCapture*ic;
privateslots:
void displayImage(intid,QImageimage);
void videoFrameCapture();
};
#endif //MAINWINDOW_H
------------------------------------------------------------------------
main.cpp
#include "cat.h"
#include <QCoreApplication>
int main(int argc, char * argv[]) {
QCoreApplication a(argc,argv);
Cat c;
c.name = "A";
c.start(); // 呼叫 run()
Cat c2;
c2.name = "B";
c2.start(); // 呼叫 run()
return a.exec();
}
---------------------------------------------------------------------
Cat.h
#ifndefCAT_H
#defineCAT_H
#include <QThread>
#include <QDebug>
class Cat : public QThread {
public:
Cat();
void run();
QString name;
};
#endif//CAT_H
---------------------------------------------------------------------
Cat.cpp
#include "cat.h"
Cat::Cat(){
}
void Cat::run(){
for(int i=1; i<=100; i++){
qDebug() << name << i;
QThread::currentThread()->msleep(100); // 暫停 0.1 秒
}
}
本範例環境：
作業系統：Win 10
編譯器：MSVC 2013
開發環境：Qt Creator 3.5.1
Qt 版本：5.5.1
注意：如果是用 MSVC 編譯器，可以播 mp4 檔案；MinGW 則不能播 mp4 檔案，但可以播 avi 與 mpg 檔案
1. 先新增一個 Qt Widgets Application 專案
常用參數:
QIODevice::ReadWrite
QIODevice::ReadOnly
QIODevice::WriteOnly
QIODevice::Text
QIODevice::Append
檔案讀取：
寫入Json 物件：
#include<QCoreApplication>
#include<QJsonDocument>
#include<QJsonObject>
#include<QJsonValue>
#include<QJsonArray>
#include<QDebug>
int main(int argc,char * argv[]) {
QCoreApplication a(argc,argv);
QJsonObject jsonObj;
jsonObj.insert("A","aaa");
jsonObj.insert("B","bbb");
//輸出：
QJsonDocument doc(jsonObj);
QString strJson(doc.toJson());
qDebug()<<strJson.toStdString().data();
return a.exec();
}
輸出結果：
----------------------------------------------------------------------------------------------------------
Json 物件單行輸出：
#include<QCoreApplication>
#include<QJsonDocument>
#include<QJsonObject>
#include<QJsonValue>
#include<QJsonArray>
#include<QDebug>
int main(int argc, char * argv[]){
QCoreApplication a(argc,argv);
QJsonObject jsonObj;
jsonObj.insert("A","aaa");
jsonObj.insert("B","bbb");
//輸出：
QJsonDocument doc(jsonObj);
QString strJson(doc.toJson(QJsonDocument::Compact));
qDebug()<<strJson.toStdString().data();
return a.exec();
}
輸出結果：
----------------------------------------------------------------------------------------------------------
Json 巢狀物件：
#include<QCoreApplication>
#include<QJsonDocument>
#include<QJsonObject>
#include<QJsonValue>
#include<QJsonArray>
#include<QDebug>
int main(int argc, char * argv[]){
QCoreApplication a(argc,argv);
QJsonObject country;
country.insert("Japan","HelloKitty");
QJsonObject city;
city.insert("Taipei","101");
country.insert("Taiwan",city);
//輸出：
QJsonDocument doc(country);
QString strJson(doc.toJson(QJsonDocument::Compact));
qDebug()<<strJson.toStdString().data();
return a.exec();
}
輸出結果：
----------------------------------------------------------------------------------------------------------
Json 陣列：
#include<QCoreApplication>
#include<QDebug>
#include<QtNetwork/QNetworkAccessManager>
#include<QtNetwork/QNetworkRequest>
#include<QtNetwork/QNetworkReply>
#include<QUrl>
#include<QUrlQuery>
#include<QFile>
void sendRequest(){
QEventLoop eventLoop;
QNetworkAccessManager mgr;
QObject::connect(&mgr,SIGNAL(finished(QNetworkReply*)),&eventLoop,SLOT(quit()));
QNetworkRequest req(QUrl(QString("http://i39.tinypic.com/1yn3wx.jpg")));
QNetworkReply * reply = mgr.get(req);
eventLoop.exec();
if(reply->error()==QNetworkReply::NoError){
//連接成功
qDebug()<<"Download...";
QFile * file = new QFile("C:/Test/downloaded.jpg");
if(file->open(QFile::Append)) {
file->write(reply->readAll());
file->flush();
file->close();
}
delete file;
qDebug() << "ok";
}else{
//連接失敗
qDebug() << "Failure" <<reply -> errorString();
}
delete reply;
}
intmain(int argc, char * argv[]) {
QCoreApplication a(argc,argv);
sendRequest();
return a.exec();
}
#include <QCoreApplication>
#include <QDebug>
#include "windows.h" // Windows
// #include "#include <sys/stat.h>" // Linux
intmain(int argc, char * argv[]){
QCoreApplication a(argc,argv);
QString msg;
for(int i=1;i<=10;i++){
msg.sprintf("Hello:%d",i);
qDebug()<<msg.toStdString().c_str();
Sleep(1000);
}
returna.exec();
}
也可以參考：http://blog.csdn.net/dbzhang800/article/details/6300425
#include<QCoreApplication>
#include<QDebug>
#include<QtNetwork/QNetworkAccessManager>
#include<QtNetwork/QNetworkRequest>
#include<QtNetwork/QNetworkReply>
#include<QUrl>
#include<QUrlQuery>
void sendRequest() {
QEventLoop eventLoop;
QNetworkAccessManager mgr;
QObject::connect(&mgr,SIGNAL(finished(QNetworkReply*)),&eventLoop,SLOT(quit()));
QNetworkRequest req(QUrl(QString("http://ip.jsontest.com/")));
QNetworkReply * reply=mgr.get(req);
eventLoop.exec();
if(reply->error()==QNetworkReply::NoError){
//連接成功
qDebug()<<"Success"<<reply->readAll();
} else {
//連接失敗
qDebug()<<"Failure"<<reply->errorString();
}
delete reply;
}
int main(int argc, char * argv[]) {
QCoreApplication a(argc, argv);
sendRequest();
return a.exec();
}
#include<QApplication>
#include<QLabel>
intmain(intargc,char*argv[]) {
QApplicationa(argc,argv);
QWidget*w=newQWidget();
QLabeltxt(w);
txt.setText("世界你好");
w->setWindowTitle("安安你好");
w->setMinimumWidth(300);
w->setMinimumHeight(200);
w->show();
returna.exec();
}
#include<QApplication>
#include<QLabel>
#include<QVBoxLayout>
#include<QPushButton>
intmain(intargc,char*argv[]){
QApplicationa(argc,argv);
QWidget*w=newQWidget();
//建立文字(Label)
QLabeltxt(w);
txt.setText("世界你好");
//建立按鈕(Button)
QPushButton*b=newQPushButton(QObject::tr("關閉拉"),w);
QObject::connect(b,SIGNAL(clicked()),w,SLOT(close()));//按下按鈕關閉程式
//將Label與Button加入垂直Layout中
QVBoxLayout*layout=newQVBoxLayout;
layout->addWidget(&txt);
layout->addWidget(b);
//Layout加入Widget中
w->setLayout(layout);
//設定：視窗標題、大小
w->setWindowTitle("安安你好");
w->setMinimumWidth(300);
w->setMinimumHeight(200);
//顯示視窗
w->show();
returna.exec();
}
