欢迎来到QtNetworkNg的文档！¶
QtNetworkNg一览¶
QtNetworkNg是基于协程的网络工具包，类似boost::asio但借鉴了QtNetwork和Python gevent的设计理念。与boost::asio和Qt的QtNetwork相比，QtNetworkNg提供了更简洁的API。正如其名，QtNetworkNg需要Qt5框架支持。以下是一个获取网页的简单示例：
#include <QtCore/qdebug.h>
#include "qtnetworkng.h"
int main(int argc, char **argv)
{
qtng::HttpSession session;
qtng::HttpResponse r = session.get("http://www.example.com/");
if (r.isOk()) {
qDebug() << r.html();
} else {
qDebug() << "failed.";
}
return 0;
}
另一个建立IPv4 TCP连接的示例：
#include <QtCore/qdebug.h>
#include "qtnetworkng.h"
int main(int argc, char **argv)
{
qtng::Socket conn;
conn.connect("news.163.com", 80);
conn.sendall("GET / HTTP/1.0\r\n\r\n");
qDebug() << conn.recv(1024 * 8);
return 0;
}
创建IPv4 TCP服务器的示例：
Socket s;
CoroutineGroup workers;
s.bind(HostAddress::AnyIPv4, 8000);
s.listen(100);
while (true) {
QSharedPointer<Socket> request(s.accept());
if (request.isNull()) {
break;
}
workers.spawn([request] {
request->sendall("hello!");
request->close();
});
}
Qt GUI获取网页的示例：
// main.cpp
#include <QApplication>
#include <QTextBrowser>
#include "qtnetworkng.h"
using namespace qtng;
class HtmlWindow: public QTextBrowser
{
public:
HtmlWindow();
virtual ~HtmlWindow() override;
private:
CoroutineGroup *operations;
};
HtmlWindow::HtmlWindow()
: operations(new CoroutineGroup)
{
operations->spawn([this] {
Coroutine::sleep(1);
HttpSession session;
HttpResponse response = session.get("http://www.example.com/");
if(response.isOk()) {
setHtml(response.html());
} else {
setHtml("failed");
}
});
}
HtmlWindow::~HtmlWindow()
{
delete operations;
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
HtmlWindow w;
w.show();
return startQtLoop(); // Qt GUI应用使用startQtLoop()启动事件循环而非app.exec()
}
对应的qmake项目文件：
# fetch_web_content.pro
TEMPLATE = app
QT += widgets
SOURCES += main.cpp
include(qtnetworkng/qtnetworkng.pri)
可见，网络编程通过非常直观的API即可完成。
尝试运行（Linux环境）:
git clone https://github.com/hgoldfish/qtnetworkng.git
cd qtnetworkng/examples/fetch_web_content/
qmake-qt5
make -j4 # mingw32-make -j4
./fetch_web_content