CRC Checker in VFP

[PaulBarbeau]

I am looking a creating an application that will validate a download file with a CRC. Does anyone know how i can geterate a CRC on a file from inside VFP?

Thanks
Paul

 

[danceman]

check SYS(2007) in vfp help
Returns the checksum value of a character expression



Attitude is Everything

 

[PaulBarbeau]

Thanks for the help

What i did was load the file into a varable called lcFileData and then use sys(2007,lcFileData) and got a value however this does not match what i know the value is

sys return 34321
real crc is 0f9d8527

Did i do something wrong? Any other ideas?

 

[PaulBarbeau]

What i am trying to do is create File 32-bit Cyclical Redundancy Check (CRC)

 

[Mike Gagnon]

PaulBardeau

This link has a CRC32 fiel for VFP:

http://foxpro.tthayer.com/SENDFILE.ASP?FI=CRC32 for files & strings.

 

[rgbean]

Paul,
SYS(2007) is a 16-bit Checksum calculation.
I have a written a CRC16 routine in FoxPro code, if you need one of these. I haven't needed the full 32-bit one, yet.

Rick

 

[PaulBarbeau]

Thanks all