sComputeCrc32 (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

This content has been translated automatically. Click here to view the French version.

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

sComputeCrc16 (Function)

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.

Versions 15 and later

This function is now available for Java applications.

This function is now available for Android applications.

New in version 15

This function is now available for Java applications.

This function is now available for Android applications.

This function is now available for Java applications.

This function is now available for Android applications.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 18 and later

This function is now available in Android Widget mode.

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Android Widget mode.

This function is now available in Windows Store apps mode.

This function is now available in Android Widget mode.

This function is now available in Windows Store apps mode.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Versions 25 and later

This function is now available in browser code.

New in version 25

This function is now available in browser code.

Versions 26 and later

This function is now available for Apple Watch applications.

New in version 26

This function is now available for Apple Watch applications.

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 (with quotes)

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.
This parameter is ignored. A single buffer is managed.

Remarks

The sComputeCrc32 function is identical to the sComputeCrc16 function, but is faster and more efficient.

Business / UI classification: Business Logic

Component: wd260std.dll