qt - 使用 Qt4 调用 REST 服务

Question

谁能告诉我一个使用 Qt4 调用 REST 服务的简单方法？我找不到任何关于如何执行此操作的体面文档。现在我有类似的东西:

int NetworkClient::attemptLogin( QString username, QString password, int & error ) {

  QNetworkAccessManager *manager = new QNetworkAccessManager(this);

  QObject::connect(manager, SIGNAL(finished(QNetworkReply *)), SLOT(slotRequestFinished(QNetworkReply *)));

  QNetworkRequest request;
  request.setUrl(QUrl("http://192.168.20.155:3000/api/rest/user?id=" + username));
  request.setHeader(QNetworkRequest::ContentTypeHeader, "text/xml");

  QNetworkReply *reply = 0;
  reply = manager->get(request);

  qDebug() << reply;

我离得还近吗？

这是我的调用代码:

void LoginWindow::attemptLogin() {
  int loginError;

  QString username = usernameField->text();
  QString password = passwordField->text();

  int minutes = net.attemptLogin( username, password, loginError );

  if ( minutes ) {
    attemptLoginSuccess( username, password, minutes );
  } else {
    attemptLoginFailure( loginError );
  }
}

Answer 1

这是我的看法...

QNetworkReply* Gateway::performPost(QString service, QMap<QString, QString>params)
{
    qDebug() << QString("Post with params #").append(service) << params;

    //Initialize uri
    QString uri = Gateway::SERVICE_BASE_URI;
    QNetworkAccessManager oManager;

    //Connect signal
    connect(oManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(finished(QNetworkReply*)));

    //Construct request
    QUrl res = QUrl(
        uri.append(service)
    );

    QUrl query;

    QMapIterator<QString, QString> i(params);
    while(i.hasNext()) {
        i.next();
        query.addEncodedQueryItem(QUrl::toPercentEncoding(i.key()), QUrl::toPercentEncoding(i.value()));
    }

    //Do request
    QNetworkRequest postRequest = QNetworkRequest(res);

    //Return QNetworkReply Object   
    return oManager.post(postRequest, query.encodedQuery());
}


//Implementation
QMap<QString,QString> map;

map.insert("foo", "bar");
map.insert("bar", "foo");

//Perform the POST request
oGateway.performPost("foo/bar", map);