Visual C# .NET

Using WndProc

It is a method of using event message routine as a function of Visual C# .NET.

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 Visual C# .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.

[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
protected override void WndProc (ref Message m)

2. Handling

For example: Output "Interval timer event"

if ( m.Msg == (short)CtimerConst.TIMM_INTERVAL )
{

label_Information.Text = "Interval timer event";

}

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

base.WndProc(ref m);

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

[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, ame="FullTrust")]
protected override void WndProc(ref Message m)
{

if ( m.Msg == (short)CtimerConst.TIMM_INTERVAL )
{

label_Information.Text = "Interval timer event";

}
base.WndProc(ref m);

}

Specifying window handle

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.

Specify the window handle to the hWnd parameter in the event setting function.

In Visual C# .NET, the Handle member variable of the .NET Framework class owns the window handle. Please specify the member variable "as is" (At the same time, cast it to unit type).