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Initiating access to VTel
34 VTel Programmer Guide
Using Assign to connect to VTel
After VTel starts, an application must establish a bi-directional connection so responses
can be returned for all requests. Refer to
Using DDE on page 22 for a discussion of bi-
directional communication. Once the connection is established, the application gains a
degree of control over VTel functions.
Note:
Note:
Requests requiring access to Telephony resources will fail until after a login
has been performed.
To establish a DDE connection, the DDE Link Topic is needed to identify the applications
that wish to communicate. This is indicated by the
LinkTopic
parameter of the
Assign()
command. The
LinkTopic
parameter contains the description of the
application to respond to and the specific DDE topic, separated by the pipe or vertical bar
character (|). These may be adjustable, or preset and fixed, depending on the language
and application software that is used. In the following code example, the
LinkTopic
parameter is represented by the literal
"DDEApp|DDETopic"
:
[VTel.Assign("DDEApp|DDETopic")]
If the attempt is successful, VTel will send a DDE message to the specified application and
topic:
[VTel.Assign.response(,"DDEApp|DDETopic")]
To assign from VTelX to VTel, the following
Assign()
command and response would be
sent:
[VTel.Assign("VTelX|VTelX")]
[VTel.Assign.response(,"VTelX|VTelX")]