Comm port 1

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#941

From: 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

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Subject: Comm port 1
Date: Sun, 30 Dec 2007 18:49:42 -0600
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