Re: Printing to LPT1

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#8535

From: Stuart Borden
Date: Mon, 11 Oct 2004 07:22

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On Fri, 8 Oct 2004 21:07:29 -0400, "mike" <mfbrowne@earthlink.net> wrote:

>I am wondering if someone could tell me why this code does not send anything
>to the printer I have attached to the lpt1 port.
>
>char buff[100];
>
>strcpy(buff,"Test");
>
>    FILE *ptr = fopen("LPT1","w");
>fprintf(ptr,buff);
>fclose(ptr);
>
>If I use a windows printer then I can send data to the printer. However this
>is a receipt printer and I just want to use the lpt1 port directly. Do I
>have to do something to the lpt1 port before I send any data.
>
>Thanks for any information
>
>Mike
>

Try this:

fprintf(ptr, "%s\n\f", buff);

Most printers won't print until they know they have something to print.  This
means: 

1. Line printers wait for EOL (CR or CR/LF)--------------"\n"
2. Page printers (laser, inkjet) wait for EOP (FF)------"\f"

Stuart B.

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From: Stuart Borden <sborden@spectrontech.com>
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Subject: Re: Printing to LPT1
Date: Mon, 11 Oct 2004 16:22:46 +0900
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