DDE data communication

DDE data communication: applications are divided into customers and servers.

The process of the DDE client is as follows:

1. initialize ddeinitialize, including instance handle, callback function, DDE type and other parameters.

The callback function will process some messages, such as xtyp_advdata.

2. Connect to the server ddeconnect

Parameters include the handle, server name, and topic name during initialization.

3. Send the data request command.

4. Continuously obtain messages from the callback function, such as receiving and processing data.

5. Disconnect after processing.

The process of the DDE Server is as follows: