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Full Screen Application: Windows CE and Pocket PC

, 14 Jun 2007
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Making a full screen application for Windows CE and Pocket PC devices.

Screenshot - fullpocket.jpgScreenshot - fullCE.jpg

Introduction

Many developers must include a "full screen" feature into their applications. In this article, I am focusing on Pocket PC and Windows CE devices. I've tried to introduce a universal solution for PDA software developers using the .NET Compact Framework that will enable them to include a full screen mode on both platforms, without requiring recompilation or code changes.

Background

Why do we need a full screen mode on our PDAs? My three main reasons are:

  • To disable user interaction and access other programs on the device
  • To make full use of the screen space
  • To customize forms

Using the code

There are three steps to my full screen solution.

  1. Detecting the platform type by invoking Windows API and changing the form behavior accordingly:

    Platform type detection is a simple call to SystemParametersInfo to find whether you are running on a Smartphone or a Pocket PC. You need a few constants defined and the P/Invoke marshaling code to make it work from managed code. I am using SystemParametersInfo4Strings P/Invoke to detect if the device is a Pocket PC or not.

    public enum SystemParametersInfoActions : uint
    {
        SPI_GETPLATFORMTYPE = 257, 
        // this is used elsewhere for Smartphone/PocketPC detection
    }
    #endregion
    
    /// 
    /// Get Platform Type: Pocket Pc or Windows CE
    /// 
    /// 
    public static string GetPlatformType()
    {
        StringBuilder platformType = new StringBuilder(50);
        if (SystemParametersInfo4Strings(
        (uint)SystemParametersInfoActions.SPI_GETPLATFORMTYPE,
            (uint)platformType.Capacity, platformType, 0) == 0)
            throw new Exception("Error getting platform type.");
        return platformType.ToString();
    }

    Platform detection method:

    /// 
    /// Platform Detections methods
    /// 
    internal partial class PlatformDetection
    {
        public static bool IsSmartphone()
        {
            return PInvoke.GetPlatformType() == "SmartPhone";
        }
        public static bool IsPocketPC()
        {
            return PInvoke.GetPlatformType() == "PocketPC";
        }
    }

    P/Invoke descriptions:

    //to find whether you are running on a Smartphone or a Pocket PC
    [DllImport("Coredll.dll", EntryPoint = "SystemParametersInfoW", 
        CharSet = CharSet.Unicode)]
    tatic extern int SystemParametersInfo4Strings(uint uiAction, 
        uint uiParam, StringBuilder pvParam, uint fWinIni);
        
    //The GetCapture function retrieves a handle to the window  
    [DllImport("coredll.dll")]
    private static extern IntPtr GetCapture();
    
    //The SetCapture function sets the mouse capture to
    //the specified window belonging to the current thread   
    [DllImport("coredll.dll")]
    private static extern IntPtr SetCapture(IntPtr hWnd);
    
    //This function can be used to take over certain areas of the screen
    //It is used to modify the taskbar, Input Panel button,
    //or Start menu icon.
    [DllImport("aygshell.dll", SetLastError = true)]
    private static extern bool SHFullScreen(IntPtr hwnd, int state);
    
    //The function retrieves the handle to the top-level 
    //window whose class name and window name match 
    //the specified strings. This function does not search child windows.
    [DllImport("coredll.dll", SetLastError = true)]
    private static extern IntPtr FindWindowW(string lpClass, string
        lpWindow);
        
    //changes the position and dimensions of the specified window
    [DllImport("coredll.dll", SetLastError = true)]
    private static extern IntPtr MoveWindow(IntPtr hwnd, int x, 
        int y, int w, int l, int repaint);

    This code is of the "set full screen" method:

    //if not Pocket PC platform
    if (!Platform.PlatformDetection.IsPocketPC()) 
    {
        //Set Full Screen For Windows CE Device
    
        //Normalize windows state
        form.WindowState = FormWindowState.Normal;
    
        IntPtr iptr = form.Handle;
        SHFullScreen(iptr, (int)FullScreenFlags.HideStartIcon);
                
        //detect taskbar height
        int taskbarHeight = 
            Screen.PrimaryScreen.Bounds.Height - 
            Screen.PrimaryScreen.WorkingArea.Height;
    
        // move the viewing window north taskbar 
        // height to get rid of the command bar 
        MoveWindow(iptr, 0, -taskbarHeight, 
            Screen.PrimaryScreen.Bounds.Width, 
            Screen.PrimaryScreen.Bounds.Height + taskbarHeight, 1);
    
    
        // move the task bar south taskbar height so that it's 
        // not visible anylonger 
        IntPtr iptrTB = FindWindowW("HHTaskBar", null);
        MoveWindow(iptrTB, 0, Screen.PrimaryScreen.Bounds.Height, 
            Screen.PrimaryScreen.Bounds.Width, taskbarHeight, 1);
    }
    else //pocket pc platform
    {
        //Set Full Screen For Pocket Pc Device
        form.Menu = null;
        form.ControlBox = false;
        form.FormBorderStyle = FormBorderStyle.None;
        form.WindowState = FormWindowState.Maximized;
        form.Text = string.Empty;
    }
  2. Calling the form load event's "make full screen" method:
    private void MainForm_Load(object sender, EventArgs e)
    {
        FullScreen.StartFullScreen(this);
    }
  3. Calling the form closing event's "remove full screen" method:
    private void MainForm_Closing(object sender, CancelEventArgs e)
    {
        FullScreen.StopFullScreen(this);
    }

What is next?

In addition, you can customize forms as well as set your own title with battery life and your own close button. Let's do it!

History

  • 7 June, 2007 -- Original article posted
  • 13 June, 2007 -- Updated
  • 14 June, 2007 -- Updated some more

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Oleg Levin
Software Developer SoftSolutions
Israel Israel
No Biography provided

Comments and Discussions

 
QuestionHow to do MDI applications in Windows CE 5.0 (.Net) PinmemberSanShark20-Jan-09 21:12 
AnswerRe: How to do MDI applications in Windows CE 5.0 (.Net) PinmemberOleg Levin21-Jan-09 9:49 
Questionbackground image? PinmemberAlessandro7-Jul-08 0:49 
AnswerRe: background image? PinmemberOleg Levin7-Jul-08 1:32 
Generalhide the SIP keyboard icon Pinmemberram krishna pattnayak25-Mar-08 22:10 
Hi
i follow your code,and implement the code i do a little bit change in the code part only
public static void StartFullScreen(Form form)
{

//Set Full Screen For Windows CE Device
 
//Normalize windows state
form.WindowState = FormWindowState.Normal;
 
IntPtr iptr = form.Handle;
SHFullScreen(iptr, (int)FullScreenFlags.HideStartIcon);
SHFullScreen(iptr, (int)FullScreenFlags.HideSipButton);
//detect taskbar height
int taskbarHeight = Screen.PrimaryScreen.Bounds.Height - Screen.PrimaryScreen.WorkingArea.Height;
 
// move the viewing window north taskbar height to get rid of the command
//bar
MoveWindow(iptr, 0, -taskbarHeight, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height + taskbarHeight, 1);
 

// move the task bar south taskbar height so that its not visible anylonger
IntPtr iptrTB = FindWindowW("HHTaskBar", null);
MoveWindow(iptrTB, 0, Screen.PrimaryScreen.Bounds.Height, Screen.PrimaryScreen.Bounds.Width, taskbarHeight, 1);

 
}
 

///
/// Stop Full Screen Mode
///

///
public static void StopFullScreen(Form form)
{

IntPtr iptr = form.Handle;
 
SHFullScreen(iptr, (int)FullScreenFlags.ShowStartIcon);
 
//detect taskbar height
int taskbarHeight = Screen.PrimaryScreen.Bounds.Height - Screen.PrimaryScreen.WorkingArea.Height;
 
MoveWindow(iptr, 0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height - taskbarHeight, 1);
 
IntPtr iptrTB = FindWindowW("HHTaskBar", null);
MoveWindow(iptrTB, 0, Screen.PrimaryScreen.Bounds.Height - taskbarHeight, Screen.PrimaryScreen.Bounds.Width, taskbarHeight, 1);
 

 

 
}
i want to make the application for pocket pc only,due to i do little bit change,i only want to hide the sip key icon and start icon in the form load in C# ,when we move to the next form the keyboard again show.Please help me regarding this problem.
give me suggestion .
 
Ram Krishna Pattnayak
Software Developer(SDS)
Sun-Dew Solutions Pvt.Ltd
www.sundewsolutions.com
kolkata

GeneralRe: hide the SIP keyboard icon PinmemberOleg Levin26-Mar-08 4:21 
GeneralRe: hide the SIP keyboard icon Pinmemberram krishna pattnayak26-Mar-08 4:45 
GeneralRe: hide the SIP keyboard icon PinmemberOleg Levin26-Mar-08 18:36 
QuestionWhat about restoring?... PinmemberWin32nipuh7-Nov-07 20:51 
GeneralMaximized PinmemberDali Hammadi16-Aug-07 8:08 
GeneralTweak for Smartphone Mobile 5 Pinmembertban200330-Jul-07 12:12 
Questionwhy use partial class PinmemberDavid J Gu3-Jul-07 4:05 
AnswerRe: why use partial class PinmemberOleg Levin3-Jul-07 4:26 
GeneralFormWindowState.Maximized Pinmemberronzulu16-Jun-07 21:04 
GeneralMissing Information PinmemberNiteman12-Jun-07 21:18 
GeneralRe: Missing Information [modified] PinmemberOleg Levin12-Jun-07 21:32 
GeneralRe: Missing Information PinmemberNiteman12-Jun-07 21:55 
QuestionWorks for all resolutions? Pinmemberlonifasiko12-Jun-07 0:56 
AnswerRe: Works for all resolutions? PinmemberOleg Levin12-Jun-07 1:43 

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