[WinPrnDev] Re: Intercepting data sent to the printer
- From: akshay gupta <akshaygupta202@xxxxxxxxx>
- To: winprndev@xxxxxxxxxxxxx
- Date: Tue, 29 Nov 2011 13:59:46 +0530
Thanks for quick replies, Ill tell exactly what i want and what i have
tried till now.
What I want :
There is a third party application whose task is to generate a document
(which is sort of a bill) and after generating it, it prints that document.
Now I want to some how get the text that printer will printing before it
actually prints it, and modify it and send the modified text back to the
printer.
What I have tried:
I have Experimented with EPSON TM-T88IV Receipt printers.
1) I first though that I would print to a file and then read and edit the
contents of that file and send it to the printer for printing. But the file
that it created didnt contained what I expected. It had unreadable data
which I had no idea how to convert it to a readable format.
2)I tried hooking to the com port and intercept the data that is flowing
through it. But again all I got was a stream of unreadable data.
Regards,
Akshay
On Tue, Nov 29, 2011 at 1:25 PM, Christoph Lindemann <
Christoph.Lindemann@xxxxxxxxxxxxxxxxxxx> wrote:
> **
>
> Hi Akshay,****
>
> ** **
>
> Check out the Windows Driver Development Kit (WDK) documentation about how
> the print spooler is working.****
>
> ** **
>
> The available options depend on how the application is sending data to the
> printer, and what you are trying to accomplish. Is the application using
> the GDI API to render the job, or is it sending the data directly to the
> printer? Do you want to capture the print like a virtual printer? Or do you
> just want to “listen” to the job data, but the data should still go to the
> printer? Do you want to modify the data stream? What type is the printer?*
> ***
>
> ** **
>
> I think it would be best, if you give us more context information,
> describe what you want to accomplish? Why? And what your own ideas are, on
> how to do this.****
>
> ** **
>
> Best regards****
>
> Christoph****
>
> ** **
> ------------------------------
>
> *From:* winprndev-bounce@xxxxxxxxxxxxx [mailto:
> winprndev-bounce@xxxxxxxxxxxxx] *On Behalf Of *akshay gupta
> *Sent:* Tuesday, November 29, 2011 8:32 AM
> *To:* **winprndev@xxxxxxxxxxxxx
> **
> *Subject:* [WinPrnDev] Intercepting data sent to the printer
> ****
>
> ** **
>
> Hi,
>
>
> I am working with an application that prints to a thermal POS printers in
> windows environment.
> Can somebody please tell me how can I get the actual text(readable) after
> a print command is fired from that application. I have no control over the
> code of that application therefore I want to do it at the spooler level or
> at the driver level , or some how interpret the data flowing through the
> COM port.
>
> Regards,
> akshay****
>
>
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