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4D v14.3

RECEIVE VARIABLE


RECEIVE VARIABLE ( variable )

Parameter	Type	Description
variable	Variable	Variable in which to receive

Description

RECEIVE VARIABLE receives variable, which was previously sent by SEND VARIABLE from the document or serial port previously opened by SET CHANNEL.

In interpreted mode, if the variable does not exist prior to the call to SET CHANNEL, the variable is created, typed and assigned according to what has been received. In compiled mode, the variable must be of the same type as what is received. In both cases, the contents of the variable are replaced with what is received.

Notes:

If you receive a variable from a document using this command, the document must have been opened using the SET CHANNEL command. You cannot use SET CHANNEL with a document opened with Open document, Create document oder Append document.
This command does not support array variables. If you want to send and receive arrays from a document or over a serial port, use the BLOB Commands.
During the execution of SET CHANNEL, the user can interrupt the reception by pressing Ctrl-Alt-Shift (Windows) or Command-Option-Shift (Macintosh). This interruption generates an error -9994 that you can catch with an error-handling method installed using ON ERR CALL. Usually, you only need to handle the interruption of a reception while communicating over a serial port.

Example

See example for the RECEIVE RECORD command.

System variables and sets

The OK system variable is set to 1 if the variable is received. Otherwise, the OK system variable is set to 0.