QtNetwork说明（两）使用QT实现360的ctrl+ctrl特征

头文字说明：

<span style="font-size:18px;">#ifndef GOOGLESUGGEST_H
#define GOOGLESUGGEST_H

#include <QtGui>
#include <QtNetwork>
#include <QObject>

QT_BEGIN_NAMESPACE
class QLineEdit;
class QNetworkReply;
class QTimer;
class QTreeWidget;
QT_END_NAMESPACE

//! [1]
class GSuggestCompletion : public QObject
{
    Q_OBJECT

public:
    GSuggestCompletion(QLineEdit *parent = 0);
    ~GSuggestCompletion();
    bool eventFilter(QObject *obj, QEvent *ev);
    void showCompletion(const QStringList &choices, const QStringList &hits);

public slots:

    void doneCompletion();
    void preventSuggest();
    void autoSuggest();
    void handleNetworkData(QNetworkReply *networkReply);

private:
    QLineEdit *editor;
    QTreeWidget *popup;
    QTimer *timer;
    QNetworkAccessManager networkManager;
};
//! [1]
#endif // GOOGLESUGGEST_H</span>

源码：

<span style="font-size:18px;">//made by davidsu33
//2014-10-10
//QT的googlesuggest的改造版本号
//将其改造为360的搜索
//使用工具QNetwork模块, boost的属性树以及typeof


//! [1]
#include "googlesuggest.h"
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/typeof/typeof.hpp>
#include <boost/foreach.hpp>

#include <sstream>
//#include <iosfwd>
#include <QRegExp>

//常规浏览器查找 URL http://sug.so.360.cn/suggest?callback=suggest_so&encodein=utf-8&encodeout=utf-8&format=json&fields=word,obdata&word=m
#define GSUGGEST_URL "http://sug.so.360.cn/suggest?callback=suggest_so&encodein=utf-8&encodeout=utf-8&format=json&fields=word,obdata&word=%1"
//#define GSUGGEST_URL "http://google.com/complete/search?output=toolbar&q=%1"
//! [1]

//! [2]
GSuggestCompletion::GSuggestCompletion(QLineEdit *parent): QObject(parent), editor(parent)
{
    popup = new QTreeWidget;
    popup->setWindowFlags(Qt::Popup);
    popup->setFocusPolicy(Qt::NoFocus);
    popup->setFocusProxy(parent);
    popup->setMouseTracking(true);

    popup->setColumnCount(2);
    popup->setUniformRowHeights(true);
    popup->setRootIsDecorated(false);
    popup->setEditTriggers(QTreeWidget::NoEditTriggers);
    popup->setSelectionBehavior(QTreeWidget::SelectRows);
    popup->setFrameStyle(QFrame::Box | QFrame::Plain);
    popup->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    popup->header()->hide();

    popup->installEventFilter(this);

    connect(popup, SIGNAL(itemClicked(QTreeWidgetItem*,int)),
            SLOT(doneCompletion()));

    timer = new QTimer(this);
    timer->setSingleShot(true);
    timer->setInterval(500);
    connect(timer, SIGNAL(timeout()), SLOT(autoSuggest()));
    connect(editor, SIGNAL(textEdited(QString)), timer, SLOT(start()));

    connect(&networkManager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(handleNetworkData(QNetworkReply*)));

}
//! [2]

//! [3]
GSuggestCompletion::~GSuggestCompletion()
{
    delete popup;
}
//! [3]

//! [4]
bool GSuggestCompletion::eventFilter(QObject *obj, QEvent *ev)
{
    if (obj != popup)
        return false;

    if (ev->type() == QEvent::MouseButtonPress) {
        popup->hide();
        editor->setFocus();
        return true;
    }

    if (ev->type() == QEvent::KeyPress) {

        bool consumed = false;
        int key = static_cast<QKeyEvent*>(ev)->key();
        switch (key) {
        case Qt::Key_Enter:
        case Qt::Key_Return:
            doneCompletion();
            consumed = true;

        case Qt::Key_Escape:
            editor->setFocus();
            popup->hide();
            consumed = true;

        case Qt::Key_Up:
        case Qt::Key_Down:
        case Qt::Key_Home:
        case Qt::Key_End:
        case Qt::Key_PageUp:
        case Qt::Key_PageDown:
            break;

        default:
            editor->setFocus();
            editor->event(ev);
            popup->hide();
            break;
        }

        return consumed;
    }

    return false;
}
//! [4]

//! [5]
void GSuggestCompletion::showCompletion(const QStringList &choices, const QStringList &hits)
{

    if (choices.isEmpty() || choices.count() != hits.count())
        return;

    const QPalette &pal = editor->palette();
    QColor color = pal.color(QPalette::Disabled, QPalette::WindowText);

    popup->setUpdatesEnabled(false);
    popup->clear();
    for (int i = 0; i < choices.count(); ++i) {
        QTreeWidgetItem * item;
        item = new QTreeWidgetItem(popup);
        item->setText(0, choices[i]);
        item->setText(1, hits[i]);
        item->setTextAlignment(1, Qt::AlignRight);
        item->setTextColor(1, color);
    }
    popup->setCurrentItem(popup->topLevelItem(0));
    popup->resizeColumnToContents(0);
    popup->resizeColumnToContents(1);
    popup->adjustSize();
    popup->setUpdatesEnabled(true);

    int h = popup->sizeHintForRow(0) * qMin(7, choices.count()) + 3;
    popup->resize(popup->width(), h);

    popup->move(editor->mapToGlobal(QPoint(0, editor->height())));
    popup->setFocus();
    popup->show();
}
//! [5]

//! [6]
void GSuggestCompletion::doneCompletion()
{
    timer->stop();
    popup->hide();
    editor->setFocus();
    QTreeWidgetItem *item = popup->currentItem();
    if (item) {
        editor->setText(item->text(0));
        QMetaObject::invokeMethod(editor, "returnPressed");
    }
}
//! [6]

//! [7]
void GSuggestCompletion::autoSuggest()
{
	//UTF-8的编码
    QString str = editor->text();
    QString url = QString(GSUGGEST_URL).arg(str);
	QUrl suggesturl(url);
	//suggesturl.setEncodedUrl(url.toAscii());
	//suggesturl.setHost("http://sug.so.360.cn/");

	QString strPath = suggesturl.encodedPath();
	QString strQuery = suggesturl.encodedQuery();

	QNetworkRequest req;
	req.setUrl(suggesturl);
	//req.setRawHeader("Accept", "application/javascript, */*;q=0.8");
	//req.setRawHeader("Referer", "http://www.so.com/");
	//req.setRawHeader("Accept-Language", "zh-CN");
	//req.setRawHeader("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)");
	//req.setRawHeader("Accept-Encoding", "gzip, deflate");
	//req.setRawHeader("Host", "sug.so.360.cn");
	//req.setRawHeader("Cookie","__huid=10X%2FLQOe%2B%2FDQlxBkH8JUO9HzQNDDQ5t9e2HqTqhs2HUlw%3D; __guid=132730903.1687894815517624600.1412906141457.4387");
    networkManager.get(req);

	//Accept: application/javascript, */*;q=0.8
	//Referer: http://www.so.com/
	//Accept-Language: zh-CN
	//User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
	//Accept-Encoding: gzip, deflate
}
//! [7]

//! [8]
void GSuggestCompletion::preventSuggest()
{
    timer->stop();
}
//! [8]

//! [9]
void GSuggestCompletion::handleNetworkData(QNetworkReply *networkReply)
{
    QUrl url = networkReply->url();
	QNetworkReply::NetworkError nerror = networkReply->error();
    if (!networkReply->error()) {
		//解析jason数据,UTF-8编码	

        QStringList choices;
        QStringList hits;
		

        QByteArray response(networkReply->readAll());
		QString strResponse(response);
		QString strResponse2 = QString::fromUtf8(response.data(), response.size());
		QString strResponse3 = QString::fromAscii(response.data(), response.size());
		qDebug()<<strResponse;
		
		QRegExp exp("\s*suggest_so\((.+)\);");
		int pos = exp.indexIn(strResponse);
		 QStringList capTexts = exp.capturedTexts();
		assert(capTexts[1].size() > 0);

		std::wstring wdata = strResponse.toStdWString();
		qDebug()<<wdata.c_str();

		qDebug()<<capTexts[1];
		wdata = capTexts[1].toStdWString();

		//处理成json数据的标准格式

		std::wstringstream wstream(wdata);

		boost::property_tree::wptree pt;
		try
		{
<strong><span style="color:#ff0000;">			//之前这里崩溃报错 expected array。是由于输入的数据不是标准的json格式
			//须要将其规则标准化
			boost::property_tree::read_json<boost::property_tree::wptree>(wstream, pt);</span></strong>
		}
		catch (const boost::property_tree::json_parser_error& e )
		{
			qDebug()<<"what 's "<<e.what();
			qDebug()<<"message:"<<e.message().c_str();
			assert(false);
		}
		
		QString aline, alinesecond, aword;
		std::wstring query_object = pt.get<std::wstring>(L"query");

		//BOOST_FOREACH(boost::property_tree::wptree::value_type &child, pt.get_child(L"result"))
		//{

		//}

		BOOST_AUTO(child, pt.get_child(L"result"));
		for (BOOST_AUTO(it, child.begin()); it != child.end(); ++it)
		{
<strong><span style="color:#ff0000;">			//get_child的键值对。其second仍然是一颗树
			//aline = QString::fromStdWString(it->first.data());
			//alinesecond = QString::fromStdWString(it->second.data());//ERROR
			//aword = QString::fromStdWString(it->get<std::wstring>(L"word"));//ERROR

			 boost::property_tree::wptree& childparse = it->second; 
			 aword = QString::fromStdWString(childparse.get<std::wstring>(L"word"));
			qDebug()<<aword;
			choices<<aword;
			hits<<QString::null;</span></strong>
		}

        //QXmlStreamReader xml(response);
        //while (!xml.atEnd()) {
        //    xml.readNext();
        //    if (xml.tokenType() == QXmlStreamReader::StartElement)
        //        if (xml.name() == "suggestion") {
        //            QStringRef str = xml.attributes().value("data");
        //            choices << str.toString();
        //        }
        //    if (xml.tokenType() == QXmlStreamReader::StartElement)
        //        if (xml.name() == "num_queries") {
        //            QStringRef str = xml.attributes().value("int");
        //            hits << str.toString();
        //        }
        //}

        showCompletion(choices, hits);
    }

    networkReply->deleteLater();
}
//! [9]
</span>

效果图：

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