DOS C sending to printer in Visual C++

I need help programming in Visual C++ std 4.0 for win 95.  I'm using the C language, and I need to know how to send text to the printer.  fprintf(stdprn,...) doesn't work.  Is there any other way I can get my txt to the printer.  NOTE: I need to be able to send variables with the text as well... thanx.  Let me know if you'd like to see my source code... well the general format of each of my statements is

fprintf(stdprn, "Message!  [Variable: %d]", [aVar]);

Thanx
Direwolf
direwolf@emapnet.com
direwolfAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

RONSLOWCommented:
Here is your answer straight from VC help...  
PSS ID Number: Q23976
Article last modified on 11-07-1995
 
5.10 6.00 6.00a 6.00ax 7.00 | 1.00 1.50 | 1.00 2.00 2.10 4.00
 
MS-DOS                      | WINDOWS   | WINDOWS NT
 

 
----------------------------------------------------------------------
The information in this article applies to:
 
 - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a, and 6.0ax
 - Microsoft C/C++ for MS-DOS, version 7.0
 - Microsoft Visual C++ for Windows, versions 1.0 and 1.5
 - Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, and 4.0
----------------------------------------------------------------------
 
SUMMARY
=======
 
This article presents three methods an application can use to send
output to a printer.
 
MORE INFORMATION
================
 
Method 1
--------
 
The first method uses the fprintf() function with the preopened
"stdprn" stream. The following code example demonstrates this
technique:
 
   #include <stdio.h>
   main()
   {
      fprintf(stdprn, "a line of text\n");
   }
 
This method works only in the MS-DOS operating system because the
"stdprn" stream is not defined by Microsoft Windows or Microsoft
Windows NT.
 
Method 2
--------
 
Another method uses the fopen() function to open the LPT1, LPT2, or
PRN device as a file and uses the fprintf() function to write data to
the file handle returned by fopen(). The following code example
demonstrates this technique:
 
   #include <stdio.h>
   main()
   {
      FILE *stream;
 
      stream = fopen("PRN", "w");
      fprintf(stream, "a line of text\n");
   }
 
This method works in Windows NT as well as the MS-DOS and Windows operating
systems.
 
Method 3
--------
 
Finally, in MS-DOS, an application can use the int86() or int86x()
functions to call one of the following BIOS printer services provided
by Interrupt 17h:
 
   service 0: send byte to the printer.
   service 1: initialize the printer.
   service 2: get printer status.
 
REFERENCES
==========
 
For more information on the int86() and int86x() functions, refer to
the Microsoft C "Run-Time Library Reference" manual.
 
Additional reference words: kbinf 1.00 1.50 2.00 2.10 4.00 5.10 6.00 6.00a
6.00ax 7.00
KBCategory: kbprg kbfasttip
KBSubCategory: CLngIss
=============================================================================
Copyright Microsoft Corporation 1995.

0
direwolfAuthor Commented:
Perhaps I should give you my source code, because this is not working.  Though I will give you credit, at least it will compile.  Here's my code:

// structure of the output variable

struct tgChr {
      char name[31];
      int fi;
      int dx;
      int in;
      int ju;
      int ps;
      int ch; };

// Code of program...

void printCharacter()
{
      FILE *stream;
      puts("Get Ready to Print\nPress Return to Print");
      fflush(stdin);
      getchar();
      fflush(stdin);
      puts("Printing Character...");
      stream = fopen("PRN", "w");
      fprintf(stream, "The Game Character\n");
      fprintf(stream, "File created with The Game Character Generater\n");
      fprintf(stream, "VERSION for DOS.\n");
      fprintf(stream, "by Andrew Gould\n");
      fprintf(stream, "Name: \t\t%s\n", curChar.name);
      fprintf(stream, "Fitness: \t%d\n", curChar.fi);
      fprintf(stream, "Dexterity: \t%d\n", curChar.dx);
      fprintf(stream, "Intelligence:\t%d\n", curChar.in);
      fprintf(stream, "Judgement:\t%d\n", curChar.ju);
      fprintf(stream, "Psyche:\t\t%d\n", curChar.ps);
      fprintf(stream, "Charisma:\t%d\n", curChar.ch);
      puts("Printing competed.");
}

My variables are all there... the point where this fails in frpintf.c is _ASSERT(str != NULL) [line 56]

Perhaps you can figure it out now?  Your other answer did not work...
0
direwolfAuthor Commented:
Adjusted points to 30
0
Become a CompTIA Certified Healthcare IT Tech

This course will help prep you to earn the CompTIA Healthcare IT Technician certification showing that you have the knowledge and skills needed to succeed in installing, managing, and troubleshooting IT systems in medical and clinical settings.

RONSLOWCommented:
Have you captured your printer .. perhaps PRN only works when a printer is caputred (check your printer properties)
0
RONSLOWCommented:
Note: that the "str" referred to in the assert if your "stream" variable - ie. your fopen failed.
0
RONSLOWCommented:
Try capturing your printer as LPT1 first.No try opening LPT1 in your program.Don't forget to check for a successful open.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
direwolfAuthor Commented:
It worked... here's the syntax:

FILE * printer;
printer = fopen("LPT1", "a"); // or LPT2
fprint(printer, "TEXT [%conversion...]"[, aVar[,...]]);
fclose(printer);

Thanx for your help...
Direwolf
direwolf@emapnet.com
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Editors IDEs

From novice to tech pro — start learning today.