Qt调用谷歌翻译API

原理：模拟Google翻译网页请求。
ps：频繁调用会封IP哦

QString GoogleAPI::translateText(QString text, QString sourceLang, QString targetLang)
{
    QString retStr="";
    QString finalPath = m_path +"?client="+m_client+"&sl="+sourceLang+"&tl="+targetLang+"&dt=t&q="+ text.toUtf8().toPercentEncoding();
    postHttp(finalPath, retStr);
    return retStr;
}

int GoogleAPI::postHttp(QString finalPath, QString& p_translate)
{
    QNetworkRequest request;
    request.setUrl(QUrl::fromEncoded(finalPath.toUtf8()));
    request.setHeader(QNetworkRequest::UserAgentHeader, m_userAgent);
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json; charset=utf-8");

    QTimer timer;
    timer.setInterval(10000);  // 设置超时时间 10 秒
    timer.setSingleShot(true);  // 单次触发
    QNetworkAccessManager networkManager;
    QNetworkReply *pReply = networkManager.get(request);
    QEventLoop loop;
    connect(&timer, &QTimer::timeout, &loop, &QEventLoop::quit);
    connect(pReply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    timer.start();
    loop.exec();

    if (timer.isActive())
    {
        // 处理响应
        timer.stop();
        if (pReply->error() != QNetworkReply::NoError)
        {
            // 错误处理
            qDebug()<<"GoogleAPI::postHttp() QNetworkReply Error String : " << pReply->errorString();
            return -1;
        }
        else
        {
            QByteArray data = pReply->readAll();

            //如果有错误的序列号
            int errorIndex = data.indexOf("error_code");
            if (errorIndex != -1)
                return errorIndex;
                
            //直接截取 QByteArray data
            QString dstStr = QString(data);
            int startPos = dstStr.indexOf("[\"");
            int endPos = dstStr.indexOf("\",\"");
            p_translate = dstStr.mid(startPos + 3, endPos - startPos - 3);

            //用一个js类型变量获得返回值的内容 ----json解析太麻烦
//            QJsonParseError jsonError;
//            QJsonDocument doucment = QJsonDocument::fromJson(data, &jsonError);
//            if(!doucment.isNull() && (jsonError.error == QJsonParseError::NoError))
//            {
//                if (doucment.isArray())
//                {
//                    QJsonArray array = doucment.array();
//                    if(array.count() > 0)
//                    {
//                        QJsonValue value = array.at(0);
//                        if(value.isArray())
//                        {
//                             QJsonArray array1 =  value.toArray();
//                             if(array1.count() > 0)
//                             {
//                                 QJsonValue value1 = array1.at(0);
//                                 if(value1.isArray())
//                                 {
//                                     QJsonArray array2 =  value1.toArray();
//                                     if(array2.count() > 0)
//                                     {
//                                         QString s = array2.at(0).toString();
//                                         qDebug()<< s;
//                                     }
//                                 }
//                             }
//                        }
//                    }
//                }
//            }
            return 0;
        }
    }
    else
    {  // 处理超时
        disconnect(pReply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
        pReply->abort();
        pReply->deleteLater();
        qDebug()<<"QNetworkReply Timeout String : " << finalPath;
        return -1;
    }
    return 0;
}

参考博客 调用谷歌翻译API（FREE）的java代码

标签：Qt,pReply,谷歌,request,timer,API,QString,data,loop
来源： https://blog.csdn.net/qq_36653749/article/details/110931697