[英]Qt LCD display not working
連接后,我試圖將http get連接流的輸出傳遞到LCD屏幕(將來的http股票行情收錄器)。 我的代碼錯誤與“ C:\\ Qt5 \\ Tools \\ QtCreator \\ bin \\ httpGET \\ mainwindow.cpp:16:錯誤:沒有匹配的函數調用'QLCDNumber :: display()ui-> lcdNumber-> display()”我不確定如何正確更新display()
//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QNetworkAccessManager>
#include <QUrl>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QImageReader>
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
nam = new QNetworkAccessManager();
ui->lcdNumber->display(10);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::connect()
{
QObject::connect(nam, SIGNAL(finished(QNetworkReply*)),
this, SLOT(finishedSlot(QNetworkReply*)));
//ui->lcdNumber->display(10);
QObject::connect(nam, SIGNAL(finished(QNetworkReply*)),
this, SLOT(on_pushButton_clicked()));
}
void MainWindow::requestPage(){
QUrl url("http://www.google.com");
QNetworkReply* reply = nam->get(QNetworkRequest(url));
}
void MainWindow::finishedSlot(QNetworkReply* reply){
QVariant statusCodeV = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
QVariant redirectionTargetUrl = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
if (reply->error() == QNetworkReply::NoError)
{
QImageReader imageReader(reply);
QImage pic = imageReader.read();
QByteArray bytes = reply->readAll(); // bytes
QString string(bytes); // string
}
else
{
}
}
void MainWindow::on_pushButton_clicked()
{
connect();
requestPage();
}
//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QObject>
#include <QNetworkAccessManager>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
public slots:
void connect();
void requestPage();
void finishedSlot(QNetworkReply* reply);
void on_pushButton_clicked();
private slots:
private:
QNetworkAccessManager* nam;
};
#endif // MAINWINDOW_H
//main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow mConnect;
mConnect.show();
return a.exec();
}
移動display()解決了LCD輸出問題。
if (reply->error() == QNetworkReply::NoError)
{
QImageReader imageReader(reply);
QImage pic = imageReader.read();
QByteArray bytes = reply->readAll(); // bytes
QString string(bytes); // string
ui->lcdNumber->display(string);
}
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