QT Http表單請求 post/get

用QT做一個客戶端來調用客戶的接口，利用到了https協議。先對post做下記錄

• 首先在pro文件中添加

QT       += network

• 然後頭文件中添加 

#include <QNetworkAccessManager>    //加載網絡請求頭文件
#include <QNetworkReply>
#include <QNetworkRequest>      //加載發送請求頭文件
#include <QEventLoop>

• 代碼示例 

void LibRSAClient::MessagePost(std::string strCiphertext)
{
    QByteArray post_data;
    QNetworkRequest network_request;
    QString strAnd = "&";
    QString strDeviceID, strDetectID, strProduct, strModel, strIMEI, strPicPath, strStartTime, strEndTime, strData;

    //設置發送的數據
    strDeviceID = "device_id=" + QString::fromStdString(m_sDefect.strDeviceID) + strAnd;
    strDetectID = "detect_id=" + QString::fromStdString(m_sDefect.strDetectID) + strAnd;
    strProduct = "product=" + QString::fromStdString(m_sDefect.strProduct) + strAnd;
    strModel = "model=" + QString::fromStdString(m_sDefect.strModel) + strAnd;
    strIMEI = "imei=" + QString::fromStdString(m_sDefect.strimei) + strAnd;
    strPicPath = "pic_path=" + QString::fromStdString(m_sDefect.strImagePath) + strAnd;
    strStartTime = "start_time=" + QString::fromStdString(m_sDefect.strStartTime) + strAnd;
    strEndTime = "end_time=" + QString::fromStdString(m_sDefect.strEndTime) + strAnd;
    strData = "data=" + QString::fromStdString(strCiphertext) + strAnd;

    post_data.append(strDeviceID);
    post_data.append(strDetectID);
    post_data.append(strProduct);
    post_data.append(strModel);
    post_data.append(strIMEI);
    post_data.append(strPicPath);
    post_data.append(strStartTime);
    post_data.append(strEndTime);
    post_data.append(strData);

    //設置頭信息
    network_request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
    network_request.setHeader(QNetworkRequest::ContentLengthHeader, post_data.length());

    //設置url
    network_request.setUrl(m_url);

    QEventLoop loop;
    QNetworkAccessManager *manage = new QNetworkAccessManager();       //分配空間
    //發送請求
    while(true)
    {
        QNetworkReply* pReply = manage->post(network_request, post_data);

        connect(pReply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
        loop.exec();

        //  獲取發送的返回結果
        QNetworkReply::NetworkError err = pReply->error();
        if(err == QNetworkReply::NoError)
        {
            QString strResult = pReply->readAll();
            //qDebug() << "Result: " << strResult;
            if(strResult.contains("succ"))
            {
                qDebug() << "post success";
                pReply->deleteLater();
                pReply = nullptr;
                break;
            }
            else
            {
                qDebug() << "post fail";
                pReply->deleteLater();
                pReply = nullptr;
                continue;
            }
        }
    }
}

• 上面用到了QEventLoop類，其爲我們提供了一種進入和退出一個事件循環的方法。在任何時候，你都可以創建一個QEventLoop實例，然後調用exec()來啓動一個事件循環，在這個循環期間，可以調用exit()或者quit()來使exct()返回。 故當pReply返回finish信號時，loop會退出。