Re: Detecting LPT port address

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#12462

From: Vladimir Afanasyev
Date: Thu, 04 Dec 2003 17:21

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Hi Moshe,

"Moshe Shahar" <msachar@tiogatech.com> wrote:

>
>More questions :
>Do the LPT work in rates like COM ?

I think no.
Serial port has hardware port (offset 0) to set rates but 
parallel hasn't.

>How can I know that the LPT port in not used by other app ?

You can use CreateFile function for open...

DWORD err=0;
HANDLE hLPT=CreateFile("LPT1",GENERIC_WRITE | GENERIC_READ,0,NULL,
OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);

if(hLPT == INVALID_HANDLE_VALUE)
   err=GetLastError();
else CloseHandle(hLPT);

if(err == ERROR_ACCESS_DENIED)
   {
    ShowMessage("Device unavailable - no access");
    return;
   }
if(err != 0)ShowMessage("Another error");
   else ShowMessage("Yes !!!")

Vladimir.

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