FiveTech Software tech support forums

Hi ,
Did we have a function in fivewin or harbour to check CRC SHA256 .

I see nFileCRC() but i am shure it is SHA256

Thanks,

Philippe

Dear Yun,

FWH provides the function nStrCrc( cString ) --> nCrc

also function nFileCrc( cFileName ) --> nCrc

Dear Yuri,

You can use FWH function nFileCRC( cFileName [, lJumpFirst32bytesForDBFs] )

... nAnd() nArgC() nBmpHeight() nBmpWidth() nColorToN() nDbl2Flt() nDDEGetErrorString() NDdeShareSetInfo() nDlgBox() NextDlgTabItem() nExtMem() nFileCrc() nGetBackRgb() nGetFileFilter() nGetFilter32() nGetForeRGB() nHex() nHiByte() nHiWord() nIcons() nLoByte() nLoWord() nMakeLong() nMciOpen() ...

Jeff,

You can use FWH DecToHex():

DecToHex( nFileCRC( cFileName ) )

DecToHex( nStrCRC( cString ) )

Jeff,

FWH provides:

nFileCRC( cFileName ) --> nCRC

nStrCRC( cString ) --> nCRC

Antonio,

You may use FWH function nFileCRC( cFileName ) --> nCRC to calculate the checksum of a file

If the file is modified, the CRC will be different

... as I get to the 'nitty gritty' of the system. And by the way - don't go creating 5 000 000 records and run it on a network - I have not removed my nFileCRC( )'s yet!!! :) Regards, Dale.

OK, OK, OK!

As always - you are right!

nFileCRC( ) OBVIOUSLY reads the entire file because with 50000 records the system becomes unuseable i.e. every time the timer ticks the system stalls for a time and then comes back to life!!!!!!

Back to the drawing board

Regards,

Dale.

... it reads or creates a checksum from the header though. Anyone know anything more about this? Anywhere I can look for more technical information on nFileCRC( )? Regards, Dale.

Hello Dutch, There is a function called nFileCRC( ) that returns the Checksum of a file. The Checksum of a file seems to change whenever any change is made to the file including just the simple flagging of a record for deletion. e.g. nFileCheckSum ...

João,

Sí, es un ejemplo de uso de nFileCRC()

Antonio Linares wrote:avs,

Puedes usar la función de FWH nFileCrc( <cNombreFichero> ) --> nCRC

No se si el valor retornado es exactamente el mismo que el MD5, pero es un CRC con lo que te sirve perfectamente.

Buenos dias Antonio.

El ejemplo ke tu ti referis, és TESTCRC.PRG???

avs,

Puedes usar la función de FWH nFileCrc( <cNombreFichero> ) --> nCRC

No se si el valor retornado es exactamente el mismo que el MD5, pero es un CRC con lo que te sirve perfectamente.