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Stored procedures
sComputeCrc32 (Function)
In french: sCalculeCrc32
Calculates the Cyclical Redundancy Check (CRC) of buffer.
Remark: The CRC is equivalent to a buffer signature. Any modification made to the buffer changes the CRC value. The use of CRC allows you to detect the possible file modifications during a transfer via network. You can compare the CRC of the file before and after transmission. If they are identical, the file was probably not modified during the transfer.
Example
// Calculates the CRC of a string
CRC is int
CRC = sComputeCrc32(MyString)
 
// Transmits the string and the CRC
 
// Check the integrity of string
IF sComputeCrc32(MyString) <> CRC THEN Info("Modified string")
Syntax
<Result> = sComputeCrc32(<Buffer> [, <Partial CRC>])
<Result>: Integer
Control value of string (CRC)
<Buffer>: Buffer or character string
String or buffer used to calculate the control value (CRC)
<Partial CRC>: Optional integer
Result of a previous CRC calculation. This parameter is used to calculate the CRC of two buffers in a row: there is no need to concatenate the buffers. This parameter corresponds to 0 (a single buffer is managed) by default.
PHP This parameter is ignored. A single buffer is managed.
Remarks
sComputeCrc32 is identical to sComputeCrc16, but it is faster and more efficient.
Business / UI classification: Business Logic
Component: wd280std.dll
Minimum version required
  • Version 9
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