QWebEngineView添加自定义网址协议UrlScheme

QWebEngineView可以和js交互需要使用QWebChannel，如果不使用的话，js可以请求自定义网址协议，相当于请求服务器，但是不用Qt专门做服务器，不占用系统端口。

如果结合系统自定义URL注册，可以达到访问自定义URL，启动我们的Qt程序，程序里再处理自定义URL网址

1.继承QWebEngineUrlSchemeHandler 创建协议处理类

class AMUrlSchemeHandler : public QWebEngineUrlSchemeHandler
{Q_OBJECTpublic:AMUrlSchemeHandler(QObject *parent);~AMUrlSchemeHandler();virtual void requestStarted(QWebEngineUrlRequestJob* pReqJob);
};

2. 在requestStarted编写响应内容

void AMUrlSchemeHandler::requestStarted(QWebEngineUrlRequestJob* pReqJob)
{QJsonObject jsonObj;jsonObj.insert("requestUrl", pReqJob->requestUrl().toString());jsonObj.insert("requestMethod", QString(pReqJob->requestMethod()));jsonObj.insert("initiator", pReqJob->initiator().toString());if (pReqJob->requestUrl().toString() == "amurl://www.baidu.com"){if (pReqJob->requestMethod() == "GET"){jsonObj.insert("result", "GET 0");}else if (pReqJob->requestMethod() == "POST"){jsonObj.insert("result", "POST 1");}else{pReqJob->fail(QWebEngineUrlRequestJob::RequestDenied);return;}}QBuffer* buffer = new QBuffer;connect(pReqJob, SIGNAL(destroyed()), buffer, SLOT(deleteLater()));buffer->open(QIODevice::WriteOnly);QString strJson = QJsonDocument(jsonObj).toJson(QJsonDocument::Indented);buffer->write(strJson.toUtf8());buffer->close();pReqJob->reply("application/json", buffer);
}

3.在QApplication初始化前注册自定义协议QWebEngineUrlScheme::registerScheme(scheme);

4. 再安装协议处理类installUrlSchemeHandler("amurl", handler);

int main(int argc, char *argv[])
{QWebEngineUrlScheme scheme("amurl");scheme.setSyntax(QWebEngineUrlScheme::Syntax::Path);scheme.setFlags(QWebEngineUrlScheme::SecureScheme);QWebEngineUrlScheme::registerScheme(scheme);QApplication a(argc, argv);AMUrlSchemeHandler* handler = new AMUrlSchemeHandler(&a);QWebEngineProfile::defaultProfile()->installUrlSchemeHandler("amurl", handler);StudyQWebEngineUrlScheme w;w.show();return a.exec();
}

5. 我们可以访问试试

StudyQWebEngineUrlScheme::StudyQWebEngineUrlScheme(QWidget *parent): QMainWindow(parent)
{ui.setupUi(this);QVBoxLayout* pLayoutMain = new QVBoxLayout(ui.centralWidget);ui.centralWidget->setLayout(pLayoutMain);pLayoutMain->setContentsMargins(0, 30, 0, 0);{m_pView = new QWebEngineView(ui.centralWidget);pLayoutMain->addWidget(m_pView);{QWebEnginePage* pWebEnginePage = new QWebEnginePage(m_pView);m_pView->setPage(pWebEnginePage);}QWebEngineView* view1 = new QWebEngineView(m_pView);pLayoutMain->addWidget(view1);m_pView->page()->setDevToolsPage(view1->page());}//Get请求m_pView->load(QUrl("amurl://www.Baidu.com"));connect(ui.btnPost, &QPushButton::clicked, this, &StudyQWebEngineUrlScheme::sltBtnPostClicked);connect(ui.btnOther, &QPushButton::clicked, this, &StudyQWebEngineUrlScheme::sltBtnOtherClicked);
}void StudyQWebEngineUrlScheme::sltBtnPostClicked()
{QWebEngineHttpRequest  httpReq;httpReq.setUrl(QUrl("Amurl://www.Baidu.com"));httpReq.setMethod(QWebEngineHttpRequest::Post);m_pView->load(httpReq);//POST请求好像无效，无法处理
}void StudyQWebEngineUrlScheme::sltBtnOtherClicked()
{QWebEngineHttpRequest  httpReq;httpReq.setUrl(QUrl("Amurl://www.Baidu.coM"));httpReq.setMethod(QWebEngineHttpRequest::Method(2));m_pView->load(httpReq);//Method>=2,请求都转为Get请求了
}

官方示例：WebEngine Widgets WebUI 范例| Qt WebEngine 5.15.1 -中文文档编制,帮助,手册,教程

本文示例代码：

所有代码的7z压缩后的Base64编码如下：

（注意复制出来是一行，再Base64 Decode，保存成7z文件，再解压即可）

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