Comm port 1

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3 total messages Started by Boba Mon, 31 Dec 2007 00:49

#941

Author: Boba
Date: Mon, 31 Dec 2007 00:49

23 lines
1618 bytes

Happy New Year to ya'll!
I have exhausted all my ideas on the following problem:

HANDLE h;
  h=CreateFile("COM1",GENERIC_READ|GENERIC_WRITE,0,NULL,
               OPEN_EXISTING,FILE_FLAG_OVERLAPPED,NULL);
  if(h==INVALID_HANDLE_VALUE) return;
COMMCONFIG cmncnf;
DWORD dw;
  dw=sizeof(cmncnf);
  ZeroMemory(&cmncnf,sizeof(cmncnf));
  cmncnf.dwSize=sizeof(cmncnf);
  cmncnf.dcb.DCBlength=sizeof(cmncnf.dcb);

  //here's my problem:
  if(!GetCommConfig(h,&cmncnf,&dw))
    ShowMessage(IntToStr(GetLastError()));
    //1=ERROR_INVALID_FUNCTION
  CloseHandle(h);

For no obvious (to me) reason, all communication function
calls with this handle return FALSE. What should I be looking
for? Please help.                                     Boba

Re: Comm port 1

#942

Author: Remy Lebeau (TeamB)
Date: Mon, 31 Dec 2007 06:06

13 lines
1262 bytes

"Boba" <Boba@somewhere.world> wrote in message
news:477839b7@newsgroups.borland.com...

>   if(!GetCommConfig(h,&cmncnf,&dw))
>     ShowMessage(IntToStr(GetLastError()));
>     //1=ERROR_INVALID_FUNCTION

Which version of Windows are you running your code on?  GetCommConfig() is
supported only on Windows 2000 and later.


Gambit

Re: Comm port 1

#946

Author: Boba
Date: Mon, 31 Dec 2007 17:47

16 lines
1517 bytes

"Remy Lebeau (TeamB)" <no.spam@no.spam.com> wrote in message
news:477886bb$1@newsgroups.borland.com...
> ...
> Which version of Windows are you running your code on?  GetCommConfig() is
> supported only on Windows 2000 and later.
>

This probem occurs on some Windows2000Pro 5.00.2195:
I had no problem with Windows <= 98SE and >= 2K.Sp4.
Right now I have 2 pcs with same build 2KPro unpatched
next to each other and I've been 'having this fun' for
the last 3 days (and nights!). One of these pcs shows
the problem, the other does not; the machines are of
different hardware and have some MS licenced software
installed (serial drivers are binary identical).
Thanks.

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