[RESOLVED] how to get crc from zip

[doberman2002]

i have the code to open zip and se its contents but how do i check each file crc?
am not at home now so please share what you can thank you.

[LaVolpe]

Computing the crc for a file is a well-established algorithm. You can many examples on this site. While your aware from home, you may want to try this google search: crc file site:vbforums.com

[doberman2002]

Computing the crc for a file is a well-established algorithm. You can many examples on this site. While your aware from home, you may want to try this google search: crc file site:vbforums.com

thanks

[wqweto]

JFYI, the original cZipArchive class has a public CalcCrc32Array function that is based on libdeflate's crc32_slice4 implementation and I'm 99% sure this can beat any VB6 implementation in benchmarking (left 1% for if Olaf chimes in:-)).

cheers,
</wqw>

[dilettante]

If you make use of zlibwapi.dll you can get the CRC along with the Name (and other things if you really want them) of each item.

Here's a wrapper class for the purpose.



You'll need a version of zlibwapi.dll in the EXE folder, or somewhere along the paths in the PATH environment variable, or a path spelled out in a manifest, etc. Somewhere that the DLL search can find it.

[Wolfgang Enzinger]

The easiest way that I'm aware of is described here.

Wolfgang

[doberman2002]

If you make use of zlibwapi.dll you can get the CRC along with the Name (and other things if you really want them) of each item.

Here's a wrapper class for the purpose.



You'll need a version of zlibwapi.dll in the EXE folder, or somewhere along the paths in the PATH environment variable, or a path spelled out in a manifest, etc. Somewhere that the DLL search can find it.

thank you so much.