How to repaint the whole screen?

[sushilange]

Hi, with:

IntPtr deviceContext = GetDC(IntPtr.Zero);
Graphics deviceGraphics = Graphics.FromHdc(deviceContext)

it is possible to draw on the screen. But how can I delete the drawn objects from screen? It still appears until something changed on the screen so Windows Mobile repaint that area. I tried RedrawWindow() and also SendMessage(with WM_PAINT) to repaint the whole screen, but nothing works :(

[Joel Ivory Johnson]

I you want to paint the full screen then why don't you run your application in full screen mode?

Joel Ivory Johnson

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[sushilange]

I want to paint directly on the screen. No Form, no Control. A hidden application which paints directly on the screen. For example a text in the top bar where the start-button is. This works fine and is not the problem. The problem is, that i'm not able to delete the things I drawed on the screen. They will dissaper when Windows Mobile force the controls, forms, etc. to be repaint. For example if I draw text on the top bar the text still appears until I open the start menu, because then the bar will be repaint. After closing my hidden application I want to delete the text, which I drawed. So I have to force the whole desktop to repaint (because the text on top bar was only an example). But I tried RedrawWindow (with IntPtr.Zero) and also SendMessage (with WM_PAINT to IntPtr.Zero). This force Windows Mobile to repaint everything, but it doesnt work :(

[Dr William J Blanke]

Use InvalidateRect() and then wait for the OS to send you a WM_PAINT in response so you can redraw.

[sushilange]

Thanks, but it doesn't work, too :-(

IntPtr deviceContext = GetDC(IntPtr.Zero);

        Rectangle rectangle = Screen.PrimaryScreen.Bounds;
        using (Bitmap capture = new Bitmap(rectangle.Width, rectangle.Height))
        //Get screen context
        using (Graphics deviceGraphics = Graphics.FromHdc(deviceContext))
        //Get graphics from bitmap
        using (Graphics captureGraphics = Graphics.FromImage(capture))
        {
            // Blit the image data
            BitBlt(captureGraphics.GetHdc(), 0, 0,
                rectangle.Width, rectangle.Height, deviceGraphics.GetHdc(),
                rectangle.Left, rectangle.Top, SRCCOPY);
                      
            
            deviceGraphics.DrawString("Hello", Font, new SolidBrush(Color.Black), 10, 10);                
        }
        // Doesn't work: InvalidateRect(deviceContext, IntPtr.Zero, true);
        //Doesn't work: RedrawWindow(deviceContext, IntPtr.Zero, IntPtr.Zero, RDW\_ERASE | RDW\_INTERNALPAINT | RDW\_UPDATENOW | RDW\_INVALIDATE);
        // Doesn't work: SendMessage(deviceContext, WM\_PAINT, 0, 0);

        // I tried RedrawWindow with all possibile combinations of all parameters (RDW\_XXXX)!
        // I also tried to add directly IntPtr.Zero as Handle parameter
        // In all cases the text "Hello" is still drawn until I click on the start button
        // I run the code on WM 6.1.4 Professional (Emulator)

[PavanPareta]

Hi sushilange, try this this.Refresh();

Pavan Pareta

[sushilange]

I want to repaint/refresh Windows Mobile! And not my own application, because my own application isn't shown on the screen. If I draw directly on the screen above EVERYTHING, I want to delete this after closing my app. So I have to inform Windows Mobile that it has to repaint EVERTHING displayed on the screen.