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Printing from Borland C++

Posted on 1998-09-15
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I have a program written in Borland C++ version 4, and want a function that will send the data in the DOS window straight to the printer.
Any ideas
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Question by:andy10
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Expert Comment

by:nietod
ID: 1172763
I don't know how to print the information that is in the DOS window, but I do know how to print from a DOS application, if that is what you want.
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by:andy10
ID: 1172764
I'm not really sure. I wrote a program using Linux, and have run it through Borland C++ to make an executable file. When the program runs, it runs in a basic window, and I was wondering if there was any function that could send this data to the printer.
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by:nietod
ID: 1172765
If you just want all of the output of the program to go to a printer, you can redirect it using >> on the command line, like

SomeExe paramater1 parameter2 >> lpt1

will send the output to lpt1.  You can use "prn" for the default printer port, lptX (where x is a number) for the parallel ports and comX for the serial ports.

If you want the program to actually print out to a printer, that is different.
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Author Comment

by:andy10
ID: 1172766
I would like the program to send the output to the printer, instead of to the monitor. Is this possible? I thought there was maybe just a line of code that could do this?
cheers
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by:nietod
ID: 1172767
The above technique will do that.  But it is the user's responsibility to do it.  That is, they must add ">> lpt1" to the end of the command to make it print to the printer instead of the screen.

(note if the printer is a laser or ink jet printer the final page might not print, unless the program outputs a formfeed, or the user presses the printer's eject button.)

If you want to change the program so it always goes to the printer (and you won't have problems with the last page).  You can do so retty easily.  What you need to do will depend on how it currently prints.  Like does it currently display to "cout"? or does it use "printf()"?
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Author Comment

by:andy10
ID: 1172768
yeah, I'd like to change the program so that it always prints to the printer. It currently prints using - cout.
thanks
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Accepted Solution

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nietod earned 30 total points
ID: 1172769
In that case, the general approach is to output to a file stream, rather than to cout  (you can probably just do a search and replace to make this change).  

First create a file stream object (it may have to be global since cout was global, but you may be able to make it local to a procedure depending on your program).  have the stream object open up the printer port for writing, like

fstream OutPut(":LPT1",iou:out);

note.  I can't remember if you want the ":" before the lpt1 or not.  try it both ways.  You may need to adjust this if you printer is not on lpt, let me know if you have problems.

Then just replace every occurance of "cout" with the new stream, "OutPut".

At the end of the program, you may want to print a form feed.  This is nce for dot matix printers and is necessary for page printers (like laser printers).  Just print the form feed using

OutPut << '\f';

let me know if you have questions.
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Author Comment

by:andy10
ID: 1172770
cheers, i'll give that a try
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