COM issues

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COM issues

Hi.

I am not exactly using C++ but using native/PInvoke calls from C#. I believe this would be more appropriate forum in asking this question.

I have an MDA Vario with WM5.

 

I am having trouble with trying to send data/set comm state to COM4. PLEASE help.

I can get a VALID handle using CreateFile, no sharing, write only

Firstly, I need to GetCommState so I can set the baud rate etc...

I create a DCB and then:

 

int result = GetCommState(theComHandle, theDCB);

 

At this point, I always get error 12: ERROR_INVALID_ACCESS

If I try to SetCommState or even EscapeCommFunction(theComHandle, CLRIR) I also get this error too.

I dont understand why What am I doing wrong

 

I want to do this:

Open COM4 (IrCOMM/RAW IR)

Set baud rate

Send data

Close

 

 




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COM issues

  • SMap

    Post the actual code and declaration of variables.

    RJR

  • Tayfun Kocak

    I think I am getting a step closer but still require help.

    I can now create a more successful handle:

    CreateFile("COM4:", GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

    I can also now SetupComm(theHandle, 255, 255)

    I can now even get further as setting up GetCommState(theHandle, DCB) but here the value returned is 1 (success) but error 6 = ERROR_INVALID_HANDLE

    ignoring the error, I can SetCommState but only if I dont modify the dcb and keep the value returned from GetCommState. Still get error 6.

    what am I doing wrong



  • Sergio Arizmendi

    ill take a look but im afraid it is a hardware (really driver) limitation.

    I give up on some handset manufacturers (*cough* HTC *cough*)

     

    When I use this...

     

    IntPtr thandle = CreateFile("COM4:", GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

     

    I get a valid handle back however the lasterror gives me error 50 - ERROR_NOT_SUPPORTED

    this happens on:

     

    SPV C500 (5600SMT I believe)

    Imate SP5m

    MDA Vario PPC

    devices



  • SHOAIB AHMED

    I actually did post the code in my other post. As for the declaration of variables the only variable is a string (portPath) and a DWORD (handle). I explained this and they are available in the CreateFile docs. Please take the time to read my other post. I don't like rewiriting tutorials.

  • Matt Snyder

    My apoligies. I thought you were referring to my post when you posted.

  • Jordan Sparks

    JR Lyon, do you post with two names You and ahmedilyas are the same person

    I did not understand why are you telling to read your tutorial.

    RMJR

  • Kevin ORiordan

    Try some of the things mentioned here:

    http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=300214&SiteID=1

    I find OPEN_ALWAYS is better then OPEN_EXISTING



  • COM issues
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