NativeWindow.CreateHandle Method

public:
virtual void CreateHandle (
	CreateParams^ cp
)

public void CreateHandle (
	CreateParams cp
)

public function CreateHandle (
	cp : CreateParams
)

// MyNativeWindow class to create a window given a class name.
ref class MyNativeWindow: public NativeWindow
{
private:

   // Constant values were found in the S"windows.h" header file.
   literal int WS_CHILD = 0x40000000,WS_VISIBLE = 0x10000000,WM_ACTIVATEAPP = 0x001C;
   int windowHandle;

public:
   MyNativeWindow( Form^ parent )
   {
      CreateParams^ cp = gcnew CreateParams;

      // Fill in the CreateParams details.
      cp->Caption = "Click here";
      cp->ClassName = "Button";

      // Set the position on the form
      cp->X = 100;
      cp->Y = 100;
      cp->Height = 100;
      cp->Width = 100;

      // Specify the form as the parent.
      cp->Parent = parent->Handle;

      // Create as a child of the specified parent
      cp->Style = WS_CHILD | WS_VISIBLE;

      // Create the actual window
      this->CreateHandle( cp );
   }

protected:

   // Listen to when the handle changes to keep the variable in sync

   virtual void OnHandleChange() override
   {
      windowHandle = (int)this->Handle;
   }

   virtual void WndProc( Message % m ) override
   {
      // Listen for messages that are sent to the button window. Some messages are sent
      // to the parent window instead of the button's window.
      switch ( m.Msg )
      {
         case WM_ACTIVATEAPP:
            
            // Do something here in response to messages
            break;
      }
      NativeWindow::WndProc( m );
   }
};

// MyNativeWindow class to create a window given a class name.
/** @attribute SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)
 */
public class MyNativeWindow extends NativeWindow
{
    // Constant values were found in the "windows.h" header file.
    private int WS_CHILD = 0x40000000;
    private int WS_VISIBLE = 0x10000000;
    private int WM_ACTIVATEAPP = 0x1C;
    private int windowHandle;

    public MyNativeWindow(Form parent)
    {
        CreateParams cp = new CreateParams();

        // Fill in the CreateParams details.
        cp.set_Caption("Click here");
        cp.set_ClassName("Button");

        // Set the position on the form
        cp.set_X(100);
        cp.set_Y(100);
        cp.set_Height(100);
        cp.set_Width(100);

        // Specify the form as the parent.
        cp.set_Parent(parent.get_Handle());

        // Create as a child of the specified parent
        cp.set_Style(WS_CHILD | WS_VISIBLE);

        // Create the actual window
        this.CreateHandle(cp);
    } //MyNativeWindow

    // Listen to when the handle changes to keep the variable in sync
    protected void OnHandleChange()
    {
        windowHandle = this.get_Handle().ToInt32();
    } //OnHandleChange

    protected void WndProc(Message m)
    {
        // Listen for messages that are sent to the button window. 
        // Some messages are sent to the parent window 
        // instead of the button's window.
        if (m.get_Msg() == WM_ACTIVATEAPP) {
            // Do something here in response to messages
        }
        super.WndProc(m);
    } //WndProc
} //MyNativeWindow