Qt-示例 googlesuggest

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我是靠谱客的博主俊逸发卡，最近开发中收集的这篇文章主要介绍Qt-示例 googlesuggest，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

简介

在qt示例中，这个示例原本是展示如何使用QNetworkAccessManager获取谷歌搜索时弹出的下拉列表的内容的，但是由于某些原因，将本示例改为获取百度下拉列表内容。

在原示例中谷歌的返回结果是一个xml文档,格式如下：

<!--搜索qt时返回如下内容-->
<toplevel>
<CompleteSuggestion>
<suggestion data="qt"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="qttabbar"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="qt creator"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="qt教程"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="qtranslate"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="千图"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="全统广场"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="青团"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="晴天"/>
</CompleteSuggestion>
<CompleteSuggestion>
<suggestion data="情头"/>
</CompleteSuggestion>
</toplevel>

修改后，使用百度的返回结果为

{
	"q":"qt",
	"p":false,
	"g":
		[
			{"type":"sug","sa":"s_1","q":"情头"},
			{"type":"sug","sa":"s_2","q":"qt是什么"},
			{"type":"sug","sa":"s_3","q":"qtv6青岛电视台直播"},
			{"type":"sug","sa":"s_4","q":"qty什么意思中文翻译"},
			{"type":"sug","sa":"s_5","q":"qt间期延长"},
			{"type":"sug","sa":"s_6","q":"qts是什么意思"},
			{"type":"sug","sa":"s_7","q":"qtc间期正常范围"},
			{"type":"sug","sa":"s_8","q":"qt语音"},
			{"type":"sug","sa":"s_9","q":"qt间期"},
			{"type":"sug","sa":"s_10","q":"丘钛"}
		],
	"slid":"13696160320886506820",
	"queryid":"0x18893f193d8544"
}

演示

在这里插入图片描述

代码解析

获取百度提供的API，这些值可以通过浏览器调试 F12来抓取

//百度提供的下拉列表api 最后的%1用来传递参数
const QString gsuggestUrl(QStringLiteral("https://www.baidu.com/sugrec?prod=pc&wd=%1"));
//百度搜索关键字的api 最后的%1用来传递参数
const QString gsearchUrl = QStringLiteral("https://www.baidu.com/s?wd=%1");

获取百度传回的下拉列表数据

void GSuggestCompletion::autoSuggest()
{
    QString str = editor->text();
    QString url = gsuggestUrl.arg(str);
    networkManager.get(QNetworkRequest(url));
}

void GSuggestCompletion::handleNetworkData(QNetworkReply *networkReply)
{
    if (networkReply->error() == QNetworkReply::NoError) {
        QVector<QString> choices;
		QByteArray response(networkReply->readAll());
		//将原版的xml解析改为json，以适应百度返回值
		QJsonDocument doc(QJsonDocument::fromJson(response));
		QJsonObject obj = doc.object();
		if(obj.contains("g"))
		{
			QJsonArray arr = obj.value("g").toArray();
			for (auto item : arr)
			{
				choices<< item.toObject().value("q").toString();
			}
		}
//        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();
//                }
//        }
        showCompletion(choices);
    }
    networkReply->deleteLater();
}