Click here to Skip to main content
Click here to Skip to main content

KeyWedge: Updated

By , 21 Nov 2011
Rate this:
Please Sign up or sign in to vote.
Hello

at KeyWedge I posted my code that connects to a serial port and then simulates keystrokes into your application.

Now, there were issues where the reconnect did not automatically take place after a Suspend/Resume and you had to invoke the main window and select File-Hide just to let KeyWedge reconnect. This happens on devices that provide the communication port all the time and dont close it during a suspend.

I have added some code to watch the Windows Mobile Power Message Queue for RESUM messages and then do an automatic reconnect. The other option would have been to send some data thru the port periodically to check if it is still working. But this may disturb the attached the device.

The main change is in PowerMsgQueue.cpp. It implements the msg queue to receive power broadcast messages like done in a MSDN example code. If a resume message is encountered, the code sends a WM_USER message to the main window, which will do a SuspendComm/ResumeComm cycle. Very easy.

In PowerMsgQueue.cpp we have code that recognizes the resume:

     case PBT_TRANSITION:
      nclog(L"Power Notification Message: PBT_TRANSITION\n");
 //Add2Log(L"Power Notification Message: PBT_TRANSITION\n",TRUE);
      nclog(L"Flags: %lx\n", ppb->Flags);
      nclog(L"Length: %d\n", ppb->Length);
 wsprintf(szPBtype, L"trans.: ");
/*
Flags: 12010000
Length: 6
trans.: ON|PASSWORD|BACKLIGHTON|
*/
 if(ppb->Flags & 0x12010000)
 {
   nclog(L"PwrMsgQueue: got 'ON|PASSWORD|BACKLIGHTON'...\n");
   //send a message to main window
   iPost = PostMessage(hwndMain, WM_USER_RESUMECOMM, 0, 0);
   nclog(L"PostMessage WM_USER_RESUMECOMM returned %i\n", iPost);
 }
      break; 
 
     case PBT_RESUME:
      nclog(L"Power Notification Message: PBT_RESUME\n");
 //Add2Log(L"Power Notification Message: PBT_RESUME\n",TRUE);
 wsprintf(szPBtype, L"resume: ");
 //send a message to main window
 iPost = PostMessage(hwndMain, WM_USER_RESUMECOMM, 0, 0);
 nclog(L"PostMessage WM_USER_RESUMECOMM returned %i\n", iPost);
 nclog(L"Power: PBT_RESUME\n");
      break;
To not block the queue, I use PostMessage to inform the main window of the Resume. Here is the simple code block in WndProc of the main window:
     case WM_USER_RESUMECOMM: //will be called from bg thread after suspend/resume
 nclog(L"WndProc: received WM_USER_RESUMECOMM: restarting COMM\n");
 suspendCOMM();
 Sleep(100);
 resumeCOMM(); //suspend is called in MYMSG_TASKBARNOTIFY
 break;
The msgQueue thread is created in InitInstance of the main window:
  //create PowerResume watchdog thread
    hwndMain=hWnd;
    if(startMsgThread()==0)
      nclog(L"InitInstance: startMsgThread() OK\r\n");
    else
      nclog(L"InitInstance: startMsgThread() FAILED\r\n");
 
    //helps
    resumeCOMM();
 
    ShowWindow(hWnd, SW_HIDE);//nCmdShow);
    UpdateWindow(hWnd);
Have fun coding

Josef

VS2008 WM6 SDK Project: DOWNLOAD:KeyWedge 2 - (Hits: 11, size: 682.7 kB)

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

hjgode

Germany Germany
No Biography provided

Comments and Discussions

 
-- There are no messages in this forum --
| Advertise | Privacy | Mobile
Web02 | 2.8.140415.2 | Last Updated 21 Nov 2011
Article Copyright 2011 by hjgode
Everything else Copyright © CodeProject, 1999-2014
Terms of Use
Layout: fixed | fluid