showansi.doc

来自「国外网站上的一些精典的C程序」· DOC 代码 · 共 45 行

About a year or so ago I published an ANSI viewer here called "showansi", the
purpose of which was to view ANSI files compatible with the DOS ANSI.SYS.
These files are used not only for artwork of various types, but are used for
displaying screens with various BBS packages.

What follows is a reworked version of that viewer, again in a class 
implementation and adds the following features:

    o   Bugs in the ANSI interpreter have been fixed; namely, an
        '8' is no longer misinterpreted as a backspace (whoops!)
        and the ansi sequence parser has been fixed and simplified.
        A minor bug in the video class was also corrected and the
        scroll() member was enhanced to allow scrolling downwards.

    o   Wildcard expansion has been added, thanks to the DIRPORT
        package in Bob Stout's SNIPPETS. Since these were modified
        for 32-bit OS/2 support, I have included them here also.
        You can now say: "showansi *.ans", for example.

    o   The "ansisys" class was broken up into two classes for
        allowing the system to be extended to other types of
        screen interpreters. A base class "scrinterp" was defined
        with all the basic 'get' and standard put functions
        implemented, leaving interpretation of special characters
        to derived classes.

    o   In view of the previous item, an AVATAR level 0+ (well,
        almost :-)) was added, allowing avatar/mecca/oansi files
        to be viewed as well. A special switch was added (-a) to
        allow the input file type to be toggled.

This was tested and ported for Watcom C++ under OS/2 and MSDOS in both 16 and
32 bit modes (although a DOS4G executable is probably going a wee bit far
:-)), and OS/2 emx 32-bit. The resulting emx executable will not run under
DOS since the video calls the OS/2 API directly - this could probably be
changed by changing those calls to emx's 'portable' video interface; perhaps
someone interested will port it and send diffs or whatever. For Watcom,
compile in large model for the 16-bit executable under OS/2, and you will
need a copy of the 16-bit OS/2 toolkit (OS/2 toolkit 1.3).

Enjoy!


                                                         David Nugent