Qt液晶显示不工作

Qt LCD display not working

本文关键字：工作 液晶显示 Qt      更新时间：2023-10-16

我试图使http获取连接流的输出到lcd屏幕(未来的http股票报价器)，一旦连接。我的代码错误与" C:Qt5ToolsQtCreatorbinhttpGETmainwindow.cpp:16:错误:没有匹配的函数调用' QLCDNumber::display() ui->lcdNumber->display() "我不确定如何正确更新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();
}

移动显示()修复LCD输出问题。

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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