[移动开发]VC++ CEF3 实现模拟登录、自动填表或模拟提交功能

一、环境搭建

1、教程：https://kefong.blog.csdn.net/article/details/119910984
2、源码：https://gitee.com/kefong/mfccef.git

以下所有工作，都是在以上源码基础上进行。

二、在browser中重写网页加载完毕执行方法 CefLoadHandler->OnLoadEnd

1、[CCefBrowserEventHandler.h] CCefHandler中增加继承CefLoadHandler

CCefBrowserEventHandler.h

public CefLoadHandler

2、绑定

CCefBrowserEventHandler.h

virtual CefRefPtr<CefLoadHandler> GetLoadHandler() override { return this; }

3、重写方法OnLoadEnd，发送消息给render

CCefBrowserEventHandler.h

void OnLoadEnd(CefRefPtr<CefBrowser> browser,
			CefRefPtr<CefFrame> frame,
			int httpStatusCode);

cef_handler.cpp

void CCefBrowserEventHandler::OnLoadEnd(CefRefPtr<CefBrowser> browser,
	CefRefPtr<CefFrame> frame,
	int httpStatusCode) {
	CEF_REQUIRE_UI_THREAD();

	//声明消息体
	CefRefPtr<CefProcessMessage> message = CefProcessMessage::Create(L"changedom");
	//CefRefPtr<CefListValue> args = message->GetArgumentList();
	//args->SetSize(2);
	//args->SetString(0, L"username");
	//args->SetString(1, L"password");
	
	//browser传送消息体给render，以便render中处理一些网页信息
	frame->SendProcessMessage(PID_RENDERER, message);
}

知识点：

browser浏览器（显示网页内容的外部框）；render网页（如：frame等网页内容）

三、render接收browser中的消息，并修改网页内容

1、在CCefBrowserApp.h中增加继承public CefRenderProcessHandler

 virtual CefRefPtr<CefRenderProcessHandler> GetRenderProcessHandler() override {
        return this;
    }

2、实现OnProcessMessageReceived方法
CCefBrowserApp.h

virtual bool OnProcessMessageReceived(CefRefPtr<CefBrowser> browser,
        CefRefPtr<CefFrame> frame,
        CefProcessId source_process,
        CefRefPtr<CefProcessMessage> message) override;

CCefBrowserApp.cpp

bool CCefBrowserApp::OnProcessMessageReceived(CefRefPtr<CefBrowser> browser,
	CefRefPtr<CefFrame> frame,
	CefProcessId source_process,
	CefRefPtr<CefProcessMessage> message) {
	DCHECK_EQ(source_process, PID_BROWSER);

	CefString message_name = message->GetName();
	MessageBox(NULL, L"123456", NULL, NULL);

	if (message_name == CefString("changedom")) {
		// 页面加载完成，访问DOM
		frame->VisitDOM(new MyDomVisitor());
		//执行一条js代码
		CefString js = "alert('test');";
		frame->ExecuteJavaScript(js, frame->GetURL(), 0);
	}

	return false;
}

说明：message_name == CefString(“changedom”)中的changedom必须与browser中的传值一模一样

3、创建网页内容修改类：MyDomVisitor
MyDomVisitor.h

#pragma once
class MyDomVisitor :public CefDOMVisitor
{
public:
	void Visit(CefRefPtr<CefDOMDocument> document) override;

	void TestAccess(CefRefPtr<CefDOMDocument> document);
	void TestModify(CefRefPtr<CefDOMDocument> document);
protected:
	// Include the default reference counting implementation.
	IMPLEMENT_REFCOUNTING(MyDomVisitor);
};

MyDomVisitor.cpp

#include "pch.h"
#include "include/cef_dom.h"
#include "MyDomVisitor.h"

void MyDomVisitor::Visit(CefRefPtr<CefDOMDocument> document) {
	//MessageBox(NULL, L"111", NULL, NULL);

	TestAccess(document);
	TestModify(document);
}

void MyDomVisitor::TestAccess(CefRefPtr<CefDOMDocument> document) {

}

void MyDomVisitor::TestModify(CefRefPtr<CefDOMDocument> document) {
	CefRefPtr<CefDOMNode> kw = document->GetElementById("kw");
	if (kw.get()) {
		kw->SetElementAttribute("value", "test");
	}
}

四、最终效果