在Qt中创建Http网络请求

Comments

Jwchen08 - 为什么在Symbian手机上不能运行

为什么这段代码我在Symbian手机得不到结果？同样的请求我在电脑上可以正常运行的

jwchen08 12:22, 14 September 2011 (EEST)

Hamishwillee - Old article

The code should run on a computer as well. Note that this is an old article though.

hamishwillee 04:51, 15 September 2011 (EEST)

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文章信息

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测试基于

SDK: Qt for S60 "Garden" pre-release

设备:: Nokia 5800 XpressMusic

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兼容于

平台: S60 3rd Edition, FP1, FP2
S60 5th Edition

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平台安全性

需要的签名: Self-Signed

能力: NetworkServices

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文章

关键词: QNetworkAccessManager, QUrl, QNetworkReply, QNetworkRequest

由 dougcn 在 07 Jun 2009 创建

最后由 hamishwillee 在 11 Oct 2012 编辑

概述

此代码片段演示如何使用QNetworkAccessManager来发送HTTP请求到Internet。

注: 要想使用这段代码，你得在你的开发平台上安装Qt for Symbian。

头文件

#include <QNetworkAccessManager>
#include <QUrl>
#include <QNetworkRequest>
#include <QNetworkReply>
 
QNetworkAccessManager*  nam;

Source

创建QNetworkAccessManager 并启动监听finished信号

nam = new QNetworkAccessManager(this);
 
QObject::connect(nam, SIGNAL(finished(QNetworkReply*)),
         this, SLOT(finished(QNetworkReply*)));

HTTP GET请求

QUrl url("http://www.forum.nokia.wiki");
QNetworkReply* reply = nam->get(QNetworkRequest(url));
// NOTE: Store QNetworkReply pointer (maybe into caller). 
// When this HTTP request is finished you will receive this same 
// QNetworkReply as response parameter. 
// By the QNetworkReply pointer you can identify request and response.

接收到QNetworkAccessManager::finished信号时，HTTP请求已完成。

void MyHttpEngine::finished(QNetworkReply* reply)
    {
    // NOTE: we receive ownership of of QNetworkReply* reply -parameter
 
    // Reading attributes of the reply
    QVariant statusCodeV = 
    reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
 
    // "200 OK" received?
    if (statusCodeV.toInt()==200)
        {
        // TODO: read data from QNetworkReply
 
        // Example of creating QImage from the reply
        QImageReader imageReader(reply);
        QImage pic = imageReader.read();
 
        // Example of reading bytes form the reply
        QByteArray bytes = reply->readAll();  // bytes
        QString string(bytes); // string
        }
    // Some http error or redirect
    else
        {
        // TODO: 
        }
 
    delete reply;
    }

参看

• 更多信息，请看：QNetworkAccessManager

后置条件

HTTP 响应收到了。