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tt_message_arg_add(3)
CDE


NAME
  tt_message_arg_add - add a new argument to a message object

SYNOPSIS
  #include <Tt/tt_c.h>
  Tt_status tt_message_arg_add(Tt_message m,
			       Tt_mode n,			       const
  char *vtype,				    const char *value);

DESCRIPTION
  The tt_message_arg_add function adds a new argument to a message object.

  The application must add all arguments before the message is sent.  To
  change existing argument values, the application must use only modes TT_OUT
  or TT_INOUT.

  Adding arguments when replying to a message produces undefined results.

  The m argument is the opaque handle for the message involved in this
  operation.  The n argument specifies who (sender, handler, observers)
  writes and reads a message argument.	The following modes are defined: The
  argument is written by the sender and read by the handler and any
  observers.
  The argument is written by the handler and read by the sender and any reply
  observers.
  The argument is written by the sender and the handler and read by all.

  The vtype argument describes the type of argument data being added.  The
  value argument is the contents for the message argument attribute.  The
  application can use NULL either for values of mode TT_OUT, or if the value
  is to be filled in later with one of the following:

       tt_message_arg_val_set3
       tt_message_barg_val_set3
       tt_message_iarg_val_set3

RETURN VALUE
  Upon successful completion, the tt_message_arg_add function returns the
  status of the operation as one of the following Tt_status values: The
  operation completed successfully.
  The specified Tt_mode is invalid.
  The ttsession1 process is not running and the ToolTalk service cannot
  restart it.
  The pointer passed does not point to an object of the correct type for this
  operation.



SEE ALSO
  Tt/tt_c.h5, tt_message_arg_val_set3, tt_message_barg_add3,
  tt_message_iarg_add3.