QHttp在Qt5中不可用

Question

我注意到Qt5中不再提供QHttp類，並且我不斷收到一條錯誤消息，說我需要使用QNetworkAccessManager來執行此操作。

有沒有辦法在Qt5中訪問這個類？

Answer 1

這是一個簡單的HTTP後（我使用Qt 5.3.2）

int Connection::postRequest(QString requestType, QUrl params){ 
    QString params_array = params.query(); 

    QNetworkRequest request(user->url); 
    request.setHeader(QNetworkRequest::ContentLengthHeader, QByteArray::number(params_array.size())); 
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded"); 

    QEventLoop waitLoop; 
    QNetworkAccessManager* connection = new QNetworkAccessManager(/*`this` can also be passed*/); 
    QNetworkReply* reply = connection->post(request, params_array.toUtf8()); 
    QObject::connect(reply, SIGNAL(finished()), &waitLoop, SLOT(quit())); 
    waitLoop.exec(); 

    int errorCode = reply->error(); 
    if (errorCode != 0){ 
     // Show Error Message 
    } 
    else{ 
     // Parse "reply" 
    } 

    delete reply; 
    delete connection; 
    return errorCode; 
} 

Answer 2

假設您不需要維護龐大的代碼庫，正確的方法是使用新的QNetworkAccessManager類。

Answer 3

使用QNetworkAccessManager Qt中5.你可以使用一個事件循環要等到答覆完畢，然後閱讀可用字節：

QString My_class::My_Method() 
{ 

    QNetworkAccessManager manager; 

    QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(myURL))); 

    QEventLoop loop; 
    connect(reply, SIGNAL(finished()), &loop, SLOT(quit())); 
    connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), &loop, SLOT(quit())); 
    loop.exec(); 

    QByteArray bts = reply->readAll(); 
    QString str(bts); 

    delete reply; 

    return str; 

} 

也可以通過QNetworkAccessManager的finished信號連接到一個槽做在異步方式：

connect(&manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(onFinished(QNetworkReply*))); 

還有讀取數據：

void onFinished(QNetworkReply* reply) 
{ 

    if (reply->error() == QNetworkReply::NoError) 
    { 
     QByteArray bts = reply->readAll(); 

     ... 
    } 
}