DataSnap.EchoToChannel Sample

From Appmethod Code Examples
Jump to: navigation, search

This sample shows how to use a DataSnap/DBX TCPIP connection.

Location

You can find the EchoToChannel sample project at:

Description

The Echo to Channel sample contains two projects:

  • The client sample demonstrates how to listen for messages from a callback channel using a DataSnap/DBX TCPIP connection.
  • The server demonstrates how to implement a server method that broadcasts a message to a channel.

How to Use the Sample

Navigate to Start | Programs | Appmethod 1.16 | Samples and go to Object Pascal\DataSnap\EchoToChannel. There are two projects in the EchoToChannel directory:

EchoToChannel Server Project

  1. Open the EchoToChannelServerProject.dproj project.
  2. Build the EchoToChannelServerProject.dproj project.
  3. Run the application by clicking Run > Run in the IDE or by pressing F9.
  4. This opens an Echo to Channel server interface.
  5. Follow the EchoToChannel Client Project instructions to start one or more clients.

EchoToChannel Client Project

  1. Open the DBXEchoToChannelClientProject.dproj project.
  2. Build the DBXEchoToChannelClientProject.dproj project.
  3. Run the application by clicking Run > Run in the IDE or by pressing F9.
  4. The client application enables you to listen to a channel and call the server method class.

Files

The files used by this sample are:

EchoToChannel Server Files

File Contains

EchoToChannelServerProject

The Echo to Channel server project.

EchoToChannelServerForm

The main form that is the user interface for the Echo to Channel server sample.

EchoToChannelServerMethodsUnit1

The server methods container holding source code for the server methods used in the Echo to Channel sample.

EchoToChannelServerContainerUnit3

The server container that holds the DataSnap Server components.

EchoToChannel Client Files

File Contains

DBXEchoToChannelClientProject

The Echo to Channel client project.

DBXEchoToChannelClientClasses

Client classes created by the DataSnap proxy generator.

DBXEchoToChannelForm

The main form that is the user interface for the Basic DataSnap Client application.

DBXEchoToChannelClientModule

The Echo to Channel server module.

Classes

  • TClientModule1 implements the Echo to Channel client module.
  • TServerMethods1Client implements the server methods available for the Echo to Channel client sample.
  • TForm4 is the main form that handles all controls.

Implementation

  • A TSQLConnection object provides the DataSnap/DBX TCPIP connection.
  • The client interface has a Connect button to listen from the callback channel and an Echo button to call the server method.

Uses

See Also