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Getting a printers status if there is no windows print driver

Posted on 1997-06-21
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Last Modified: 2010-04-04
I want to be able to get the status from a printer connected to LPT1,LPT2 etc. The printer has no windows print driver installed, its data is sent via a text file opened as LPT1 etc. Any solutions?
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Question by:DaveG
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Expert Comment

by:bsys
ID: 1337361
I guess that this is the same question as I asked before (a couple of days ago).
So the value for this question is 200 + 230 points (isn't that worth the answer??).
(FOR WHAT KIND OF APPLICATION THAT)
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Expert Comment

by:bsys
ID: 1337362
Can this software be used for COM ports also???
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Expert Comment

by:sperling
ID: 1337363
What delphi and windows version(s) do you need to support?

Regards,

Erik.
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Accepted Solution

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bsys earned 200 total points
ID: 1337364
I have found it!!! I have two assembler routines, one for a com port and one for a lpt port!! It works just fine, let me know if you are interested!!! I'll send it by E-Mail!!!
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Expert Comment

by:bsys
ID: 1337365
Here it is DaveG,I am using this in my POS program:

function TPrinterStatusForm.CheckCOM(Printer: Word): Word;
var
   PS: Word; {PS = Printer Status}
begin
     asm
       mov dx,Printer {COM, starts from 0}
       mov ax,300h
       int 14h
       and ax, 127
       mov PS,ax
     end;
     Result := PS;
end;

function TPrinterStatusForm.CheckLPT(Printer: Word): Word;
var
   PS: Byte; {PS = Printer Status}
begin
     asm
       mov dx,Printer {LPT}
       mov ah,02h {Status request}
       int 17h
       mov PS,ah
     end;
     Result := PS;
end;

And this works!!!
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Expert Comment

by:davegreen
ID: 1337366
This is the routine I worked out myself from investigation- it is more or less the same:

function PrinterStatus(OutFile: Word) : byte;
var
  PrinterPort: Word;

  function GetStatus : byte;
  asm
     mov AH,$02 {get printer status}
     mov DX, PrinterPort   {lpt1=0, lpt2=1}
     Int $17   {get printer status}
     mov AL, AH
  end;
begin
  PrinterPort := OutFile;
  Result := GetStatus;
end;


The bits returned should correspond as follows

7 6 5 4 3 2 1 0   bit value
-----------------------------
1                   printer not busy
0                   printer busy
  1                 printer acknowledgment
    1               out of paper
      1             printer selected
        1           i/o error
          ? ?       unused
              1     timeout

This code works too....
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Expert Comment

by:davegreen
ID: 1337367
I withdraw this question...
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Expert Comment

by:bsys
ID: 1337368
Ok, what do you want then?????????
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