This document covers the following topics:
NGUCLGDA
You must use this subprogram in the event handler of a DDE-client event to fill the DDE-VIEW parameter data area. You must then ensure that your event handler code acts on the value of DDE-VIEW.MESSAGE. The possible values of DDE-VIEW.MESSAGE are:
| DISCONNECT | The server has terminated the conversation identified by DDE-VIEW.CONV-ID by unregistering the topic, or by exiting. |
|---|---|
| DATA | The server has sent data for DDE-VIEW.CONV-ID and DDE-VIEW.ITEM. The data are contained in DDE-VIEW.DATA. The length of the data will be contained in DDE-VIEW.DATALEN. |
| NOTIFY | The server has new data available for the conversation identified by DDE-VIEW.CONV-ID and DDE-VIEW.ITEM. The data are not sent at this point. You must request these data in your event handler. Only then the data will actually be received. |
| TIMEOUT | No server message has been received during the timeout period. |
When DDE-VIEW.MESSAGE has the value DISCONNECT, DATA, or NOTIFY, the fields DDE-VIEW.SERVICE and DDE-VIEW.TOPIC are also set appropriately.
| Name/Data Type | Explanation |
|---|---|
| 1 DDE-VIEW | Input/Output PDA for DDE subprograms. |
| 2 SERVICE (A20) | Service name. |
| 2 TOPIC (A20) | Topic name. |
| 2 CONV-ID (I4) | Conversation ID. |
| 2 MESSAGE (A20) | Message information. |
| 2 ITEM (A20) | Item of current conversation. |
| 2 FORMAT (A20) | Format of data to be sent. |
| 2 TIMEOUT (I4) | Time interval before the conversation is interrupted because there is no server message. |
| 2 DATALEN (I2) | Length of data. |
| 2 DATA-ARRAY (A1/1:V) | |
| 1 Max-Index (I2) | Input Highest index of DATA-ARRAY; can be set to any I2 value. |
| 1 Response (I4) | Output Natural error (if applicable). |