Visual Basic .NET

It is a method of using the event message routine as a function of Visual Basic .NET. (It is called VB.NET later)

When using WndProc, the event message routine is called whenever all events related to the application are generated.

Creating event message routine

When using WndProc in VB.NET, the corresponding code cannot be generated automatically,
please add the source code related to the event message routine manually.

Create the function according to the following procedure.

1. Declare the function
   By using the Message Structure in the Class of System.Windows.Forms namespace, it is possible to acquire the information related to messages being sent to the application and controls etc. from the system.

   Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
    

2. Handing
   
   For example: Output when "Count match of channel 0"

   If m.Msg = CNTM_COUNTUP_CH0 Then
       Text_ErrorString.Text = "Count match of channel 0"
   End If
    

3. WndProc handling of the base class
   Perform the handling at the end of the WndProc function.

   MyBase.WndProc(m)
    

4. Combining 1, 2 and 3, the event message routine is as follows.

   Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
       If m.Msg = CNTM_COUNTUP_CH0 Then
           Text_ErrorString.Text = "Count match of channel 0"
       End If
       MyBase.WndProc(m)
   End Sub

Specifying Window Handle

To use events, it is necessary to set the window handle of the application to the driver.
Use the following functions for event setting.

Specify the window handle to the hWnd parameter in these event setting functions.

In Visual Basic .NET, the Handle member variable of the .NET Framework class owns the window handle. Please specify the member variable "as is".