External Interfaces/API

Example: Using Visual Basic and the MATLAB DDE Server

This example shows a Visual Basic form that contains two text edit controls, TextInput and TextOutput. This code is the TextInput_KeyPress method.

• Sub TextInput_KeyPress(KeyAscii As Integer)
  rem If the user presses the return key
  rem in the TextInput control.
  If KeyAscii = vbKeyReturn then
  
  rem Initiate the conversation between the TextInput
  rem control and MATLAB under the Engine topic.
  rem Set the item to EngEvalString.
                       TextInput.LinkMode = vbLinkNone
                       TextInput.LinkTopic = "MATLAB|Engine"
                       TextInput.LinkItem = "EngEvalString"
                       TextInput.LinkMode = vbLinkManual
  
  rem Get the current string in the TextInput control.
  rem This text is the command string to send to MATLAB.
                       szCommand = TextInput.Text
  
  rem Perform DDE Execute with the command string.
                       TextInput.LinkExecute szCommand
                       TextInput.LinkMode = vbLinkNone
  
  rem Initiate the conversation between the TextOutput
  rem control and MATLAB under the Engine topic.
  rem Set the item to EngStringResult.
                       TextOutput.LinkMode = vbLinkNone
                       TextOutput.LinkTopic = "MATLAB|Engine"
                       TextOutput.LinkItem = "EngStringResult"
                       TextOutput.LinkMode = vbLinkManual
  
  rem Request the string result of the previous EngEvalString
  rem command. The string ends up in the text field of the
  rem control TextOutput.text.
                       TextOutput.LinkRequest
                       TextOutput.LinkMode = vbLinkNone
  
  End If
  End Sub
  

The DDE Name Hierarchy

Using MATLAB as a Client