It is a method of using 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.
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.
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)
Handling
For example: Output"Interval timer event"
If m.Msg = TIMM_INTERVAL Then
Text_ErrorString.Text = "Interval timer event"
End If
WndProc
handling of the base class
Perform the handling at the end of the WndProc function.
MyBase.WndProc(m)
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 = TIMM_INTERVAL
Then
Text_ErrorString.Text = "Interval timer event"
End If
MyBase.WndProc(m)
End Sub
To use the event, it is necessary to set the
window handle of the application to the driver.
Use the following function for event setting.
Interval timer |
TimStartTimer |
Specify the window handle to the hWnd parameter in the event setting function.
In Visual Basic .NET, the Handle member variable of the .NET Framework class owns the window handle. Please specify the member variable "as is".
Ret = TimStartTimer(TimerId, 10000, Handle) |