dde man page on UnixWare

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dde(n)			     Tcl Built-In Commands			dde(n)


       dde - Execute a Dynamic Data Exchange command

       package require dde 1.1

       dde servername ?topic?

       dde ?-async? command service topic ?data?

       This  command allows an application to send Dynamic Data Exchange (DDE)
       command when running under Microsoft Windows. Dynamic Data Exchange  is
       a mechanism where applications can exchange raw data. Each DDE transac‐
       tion needs a service name and a topic. Both the service name and	 topic
       are  application	 defined; Tcl uses the service name TclEval, while the
       topic name is the name of the  interpreter  given  by  dde  servername.
       Other  applications  have  their	 own  service  names  and  topics. For
       instance, Microsoft Excel has the service name Excel.

       The only option to the dde command is:

       -async Requests asynchronous invocation.	 This is valid	only  for  the
	      execute  subcommand.  Normally, the dde execute subcommand waits
	      until the command completes, returning  appropriate  error  mes‐
	      sages. When the -async option is used, the command returns imme‐
	      diately, and no error information is available.

       The following commands are a subset of the full Dynamic	Data  Exchange
       set of commands.

       dde servername ?topic?
	      dde  servername  registers  the interpreter as a DDE server with
	      the service name TclEval and the topic name specified byt topic.
	      If  no  topic  is	 given, dde servername returns the name of the
	      current topic or the empty string if it is not registered	 as  a

       dde execute service topic data
	      dde  execute takes the data and sends it to the server indicated
	      by service with the topic indicated by topic. Typically, service
	      is  the  name of an application, and topic is a file to work on.
	      The data field is given to the  remote  application.  Typically,
	      the  application	treats	the  data  field  as a script, and the
	      script is run in the application. The command returns  an	 error
	      if the script did not run. If the -async flag was used, the com‐
	      mand returns immediately with no error.

       dde poke service topic data
	      dde poke takes the data and sends it to the server indicated  by
	      service with the topic indicated by topic. Typically, service is
	      the name of an application, and topic is a file to work on.  The
	      data field is given to the remote application.

       dde request service topic item
	      dde request is typically used to get the value of something; the
	      value of a cell in Microsoft Excel or the text of a selection in
	      Microsoft Word. service is typically the name of an application,
	      topic is typically the name of the file, and  item  is  applica‐
	      tion-specific.  The command returns the value of item as defined
	      in the application.

       dde services service topic
	      dde services returns a list of  service-topic  pairs  that  cur‐
	      rently  exist on the machine. If service and topic are both null
	      strings ({}), then all service-topic pairs  currently  available
	      on the system are returned. If service is null and topic is not,
	      then all services with the specified topic are returned. If ser‐
	      vice  is	not  null and topic is, all topics for a given service
	      are returned. If both are not null, if that  service-topic  pair
	      currently exists, it is returned; otherwise, null is returned.

       dde eval topic cmd ?arg arg ...?
	      dde  eval evaluates a command and its arguments using the inter‐
	      preter specified by topic. The DDE service must be the "TclEval"
	      service.	This command can be used to replace send on Windows.

       A  Tcl interpreter always has a service name of "TclEval". Each differ‐
       ent interp of all running Tcl applications should a unique name	speci‐
       fied by dde servername. Each interp is available as a DDE topic only if
       the dde servername command was used to set the name of  the  topic  for
       each interp. So a dde services TclEval {} command will return a list of
       service-topic pairs, where each of the currently running	 interps  will
       be a topic.

       When  Tcl  processes a dde execute command, the data for the execute is
       run as a script in the interp named by the topic	 of  the  dde  execute

       When  Tcl  processes a dde request command, it returns the value of the
       variable given in the dde command in the context of the interp named by
       the  dde topic. Tcl reserves the variable "$TCLEVAL$EXECUTE$RESULT" for
       internal use, and dde request commands  for  that  variable  will  give
       unpredictable results.

       An external application which wishes to run a script in Tcl should have
       that script store its result in a variable, run the  dde	 execute  com‐
       mand, and the run dde request to get the value of the variable.

       When  using  DDE,  be careful to ensure that the event queue is flushed
       using either update or vwait.  This happens by default when using  wish
       unless  a blocking command is called (such as exec without adding the &
       to place the process in the background).	 If for any reason  the	 event
       queue  is  not  flushed, DDE commands may hang until the event queue is
       flushed.	 This can create a deadlock situation.

       application, dde, name, remote execution

       tk, winfo, send

Tcl				      8.1				dde(n)
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