4D Doc Center : BASE64 DECODE

4D v13.4

BASE64 DECODE


BASE64 DECODE ( {encodedText ;} blob )

Parameter	Type	Description
encodedText	Text	Text containing BLOB encoded in Base64 format
blob	BLOB	BLOB encoded in Base64 format
		Decoded BLOB

Description

The BASE64 DECODE command allows you to decode the BLOB coded in Base64 format passed in the encodedText or blob parameter.

If you pass the encodedText parameter, the command decodes its contents and returns it in the blob parameter. It must contain a BLOB encoded in Base64 format. In this case, the initial contents of the blob parameter are ignored by the command.
If you omit the encodedText parameter, the command directly modifies the BLOB passed in the blob parameter.

The command does not verify the contents of the encodedText or blob parameter. You must verify that the data passed is actually coded in Base64 format, otherwise the result will be incorrect.

Example

This example lets you transfer a picture via a BLOB:

 C_BLOB($sourceBlob)

 C_PICTURE($mypicture)

 $mypicture:=[people]photo

 PICTURE TO BLOB($mypicture;$sourceBlob;".JPG")

 C_TEXT($base64Text)

 BASE64 ENCODE($sourceBlob;$base64Text) //Encoding of text

  // the binary is now available as character strings in $base64Text

 

 C_TEXT($base64Text)

 C_BLOB($targetBlob)

 BASE64 DECODE($base64Text;$targetBlob) //Decoding of text

  // the binary encoded in base 64 is now available as a BLOB in $blobTarget