pnglib Files

1)usage:
  ld_file.exe <file.png>
  example 1:  ld_file.exe ..\pnglib.png
  example 2:  ld_file.exe ..\01.png

2)how to build ld_file.exe:
2.1)modify the path of visual c.
  In my computer, it is in E:\PROGRAM\vc6.0
so i write this path in set_path.bat
But it is maybe not your vc path.
You can modify them in batch files.


2.2)make ld_file.exe:
NOTE:before run lots of batch file as below, we must run set_path.bat 1st.

  make.bat will make ld_file.exe, after compile over 20 files
which are in [source] folder. That's original designed by Thomas.  

  mak2dbg.bat(debug version) or mak2rls.bat(release version)
will make ld_file.exe, after compile ld_file.c and pnglib.c.
Because the later(pnglib.c) #include over 20 files which are in [source] folder.
That's quick and dirty technique by Leisure bamboo.
The debug version can be debug by command line, such as "msdev.exe ld_file.exe ..\01.png".
But size(of debug version exe) will big than release version.

  mak3dbg.bat(debug version) or mak3rls.bat(release version) compile ld_file.c and pnglib.c,
like mak2xxx.bat, to make ld_file.exe.
But it define "_I_SIZE=256" to save memory of reading file.

  dll_dbg.bat(debug version) or dll_rls.bat(release version) will
make ld_file.exe by ld_file.c, and make png.dll by pnglib.c.
After wrap all png function in the dll, so all variable(which in ld_file.c)
will NOT worry about their names conflict with
over 20 files(which are in [source] folder).