Description
Sends data to a DDE client application when PowerBuilder is acting as a DDE server. You would usually call SetDataDDE in the script for the RemoteRequest event, which is triggered by a DDE request for data from the client application.
Syntax
SetDataDDE ( string {, applname, topic, item } )
|
Argument |
Description |
|---|---|
|
string |
The data you want to send to a DDE client application |
|
applname (optional) |
The DDE name for the client application |
|
topic (optional) |
A string whose value is the basic data grouping the DDE client application referenced |
|
item (optional) |
A string (data within topic) |
Return value
Integer.
Returns 1 if it succeeds. If an error occurs, SetDataDDE returns a negative integer. Values are:
-1 -- Function called in the wrong context
-2 -- Data not accepted
If any argument's value is null, SetDataDDE returns null.
Usage
To enable DDE server mode in your PowerBuilder application, call the StartServerDDE function. Then DDE messages from a DDE client trigger events in the PowerBuilder window. It is up to you to decide how your application responds by writing code for those events. When an application requests data of the DDE server, it triggers a RemoteRequest event. You typically call SetDataDDE in the script for a window's RemoteRequest event.
If a client application has established a hot link with a location in your PowerBuilder application, you can call SetDataDDE in an event for the object associated with the location. As a server application, you decide how location names map to the controls in your application. For example, your application can decide that the DDE name loc1 refers to the SingleLineEdit sle_name and a client application can establish a hot link with "loc1." Then in the Modified event for sle_name, you can call SetDataDDE so that the client application receives changes each time sle_name is changed. Likewise, if loc1 referred to a DataWindow, you can call SetDataDDE in the ItemChanged event for the DataWindow.
The applname argument refers to the client application that has established a channel or a hot link with your application. Topic and item refer to a topic and location recognized by your server application. You only need to specify these arguments to make it clear to the client application who should receive the message and what is being sent.
Examples
This statement illustrates how SetDataDDE is used in a script for a RemoteRequest event when another DDE application requests data. The data sent is the text of the SingleLineEdit sle_Address:
SetDataDDE(sle_Address.Text)
This statement illustrates how the optional arguments are specified:
SetDataDDE(sle_Address.Text, "MYDB", &
"Employee", "Address")See also
