c++ addressing the centronics printerport

This is a discussion on c++ addressing the centronics printerport within the C++ Programming forums, part of the General Programming Boards category; Hi, I`m using the following code: freopen("RPN","w",stdout); or: #include<fstream.h> void main() { ofstream lst("PRN"); lst<<"print this"; } This works fine ...

  1. #1
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    c++ addressing the centronics printerport

    Hi,
    I`m using the following code:

    freopen("RPN","w",stdout);

    or:

    #include<fstream.h>
    void main()
    {
    ofstream lst("PRN");
    lst<<"print this";

    }

    This works fine on the Borlandc Dos version,
    but neither works on the BC5 windows compiler,
    nor does it make the printer come online on the CBuilder though it does compile fine on all.

    I guess there`s a linker setting or so.

    Anybody knows any help?
    I`d appreciate.

    Johannes

  2. #2
    It's full of stars adrianxw's Avatar
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    Your not using DOS anymore. Get a handle to the port with the CreateFile() Win32 API routine then use handle based I/O routines. You can then write to and read from the parallel port.
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

  3. #3
    Xei
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    inp
    outp
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    Instead of bolding your text, please put code tags. [ code] instead of [ b] (no space of course). Next, don't use void main(), use int main(). Then use the new headers:
    Code:
    #include <fstream>
    using namespace std;

  5. #5
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    c++ addressing printer

    Hi,
    [code]
    #include <fstream>
    using namespace std; [/code ]

    Can anyone give me the entire code to get the printer to work on the cbuilder?
    I`m not familiar with namespace.

    this always used to work , but doesn`t with the builder:
    [code]
    #include<fstream.h>
    void main()
    {
    ofstream lst("PRN");
    lst<<"print this";
    [/code ]

    I also got a hint to use
    Code:
    outp
    but don`t know how.

    Also: Is there a button for the codetag?I only see buttons for bold ...

    Thanks ,

    Jpohannes

  6. #6
    It's full of stars adrianxw's Avatar
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    You cannot use 16 bit DOS routines on a 32 bit Windows system. Windows will, (basically), not let you access ports directly. It is a multi-tasking OS.

    Suppose the system was in the middle of a 5000 page print out when your program pops up a sticks "print this" part way through page 4000?

    You can either use the method I said before, or write a device driver. Hint, one is easier than the other. If you want to program Windows systems, forget 16 bit stuff, it's legacy, it's gone.

    I don't think there are buttons. use [code] at the start and [/code] at the end.
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

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