CEF(Chromium Embedded Framework)进程间通讯

3.3     CEF进程间通讯

3.3.1     进程间通讯函数

3.3.2     进程通讯实例

3.3.3       CEF指定frame通讯

 

3.3  CEF进程间通讯

3.3.1         进程间通讯函数

CEF有Browser进程和Renderer进程,进程之间可以相互通信。

发送消息Browser进程和Renderer进程都是一样的,使用CefBrowser::SendProcessMessage() ,SendProcessMessage第一个参数是CefProcessId,是一个枚举类型,给Browser进程发送,就用PID_BROWSER,给Render进程发送,就用PID_RENDERER。

typedef enum {

  ///

  // Browser process.

  ///

  PID_BROWSER,

  ///

  // Renderer process.

  ///

  PID_RENDERER,

} cef_process_id_t;

Render进程这边, 重写CefRenderProcessHandler::OnProcessMessageReceived()

Browser进程这边,重写CefClient::OnProcessMessageReceived()这个方法来处理跨进程消息。

3.3.2         进程通讯实例

(1)renderer进程发送消息

        CefRefPtr<CefProcessMessage> msg = CefProcessMessage::Create("login_msg");

 

        // Retrieve the argument list object.

        CefRefPtr<CefListValue> args = msg->GetArgumentList();

 

        // Populate the argument values.

        args->SetSize(2);

        args->SetString(0, strUser);

        args->SetString(1, strPassword);

 

        // Send the process message to the browser process.

        CefV8Context::GetCurrentContext()->GetBrowser()->SendProcessMessage(PID_BROWSER, msg);

(2)Browser进程这边,重写CefClient::OnProcessMessageReceived()这个方法来处理跨进程消息。接收到消息之后再回复消息。

bool ClientHandler::OnProcessMessageReceived(CefRefPtr<CefBrowser> browser,

    CefProcessId source_process,

    CefRefPtr<CefProcessMessage> message)

{

    const std::string& messageName = message->GetName();

    if (messageName == "login_msg")

    {  

        // extract message

        CefRefPtr<CefListValue> args = message->GetArgumentList();

        CefString strUser = args->GetString(0);

        CefString strPassword = args->GetString(1);

        TCHAR szLog[256] = { 0 };

        _stprintf_s(szLog, 256, _T("BrowserProcess, user - %s, password - %s\r\n"), strUser.c_str(), strPassword.c_str());

        OutputDebugString(szLog);

 

        //send reply to render process

        CefRefPtr<CefProcessMessage> outMsg = CefProcessMessage::Create("login_reply");

 

        // Retrieve the argument list object.

        CefRefPtr<CefListValue> replyArgs = outMsg->GetArgumentList();

 

        // Populate the argument values.

        replyArgs->SetSize(1);

        replyArgs->SetInt(0, 0);

 

        // Send the process message to the renderer process.

        browser->SendProcessMessage(PID_RENDERER, outMsg);

 

        return true;

    }

    return false;

}

(3)Render进程这边, 重写CefRenderProcessHandler:: OnProcessMessageReceived()方法来处理来自Browser进程的消息。

bool ClientAppRenderer::OnProcessMessageReceived(CefRefPtr<CefBrowser> browser,

    CefProcessId source_process,

    CefRefPtr<CefProcessMessage> message)

{

    const std::string& messageName = message->GetName();

    if (messageName == "login_reply")

    {

        // extract message

        CefRefPtr<CefListValue> args = message->GetArgumentList();

        int status = args->GetInt(0);

        OutputDebugString(status == 0 ? _T("Renderer process, login ok\r\n") : _T("Renderer process, login failed\r\n"));

        CefRefPtr<CefFrame> frame = browser->GetMainFrame();

        frame->ExecuteJavaScript("alert(‘Got Login Reply from Browser process‘)", frame->GetURL(), 0);

        return true;

    }

    return false;

}       

3.3.3         CEF指定frame通讯

一个网页有多个frame,有一个mainframe和多个subframe,发送消息时,将frame的id放入参数中一起发过去,接收时消息时,获取frameid,就可以实现指定frame通讯。因为frameid是一个int64类型的数据,所以发送时将它分解为两个int32

的高低位数据,接收数据时,再将两个int32的数据拼接成一个int64数据。

#define MAKE_INT64(int_low, int_high) \

    ((int64) (((int) (int_low)) | ((int64) ((int) (int_high))) << 32))

#define LOW_INT(int64_val) ((int) (int64_val))

#define HIGH_INT(int64_val) ((int) (((int64) (int64_val) >> 32) & 0xFFFFFFFFL))

 

// Sending the frame ID.

const int64 frame_id = frame->GetIdentifier();

args->SetInt(0, LOW_INT(frame_id));

args->SetInt(1, HIGH_INT(frame_id));

 

// Receiving the frame ID.

const int64 frame_id = MAKE_INT64(args->GetInt(0), args->GetInt(1));

CefRefPtr<CefFrame> frame = browser->GetFrame(frame_id);

自己开发了一个股票智能分析软件,功能很强大,需要的点击下面的链接获取:

https://www.cnblogs.com/bclshuai/p/11380657.html

CEF(Chromium Embedded Framework)进程间通讯

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