One of the developers has sent me an email asking on how to get the same list of programs that's shown in the "Running Program List" applet on Pocket PC's. I forwarded her to the EnumerateTopWindows function I'd implemented before. But she replied to me that this function enumerates all windows, including Desktop, SIP button etc... So I've added a few checks into this function such as calls to the IsWindow and IsWindowVisible API's. I've also put in a few helper functions:

private static bool CheckForDialogs(ArrayList windowList, string value)

{

      foreach(Window window in windowList)

      {

            if (window.Caption == value)

            {

                  return true;

            }

      }

      return false;

}

 

private static bool CheckExcludeList(string value)

{

      foreach(string name in excludeList)

      {

            if (name == value)

            {

                  return true;

            }

      }

      return false;

}

The first one checks if the window that has the same caption already exists and the second loops through the exclude list of some known system programs:

static string[]  excludeList = {"Desktop", "MS_SIPBUTTON", "Programs"};

So the new version of the EnumerateTopWindows looks like this:

public static Window[] EnumerateTopWindows()

{

      ArrayList windowList = new ArrayList();

      IntPtr hWnd = IntPtr.Zero;

      Window window = null;

      StringBuilder sb = null;

 

      // Get first window

      hWnd = GetActiveWindow();

      hWnd = GetWindow(hWnd, GW_HWNDFIRST);

   

      while(hWnd != IntPtr.Zero)

      {

            // Check if it is a windowm and it is visible

            if(IsWindow(hWnd) && IsWindowVisible(hWnd))

            {

                  IntPtr parentWin = GetParent(hWnd);

                  // Make sure that the window doesn't hav a parent

                  if ((parentWin == IntPtr.Zero))

                  {

                        int length = GetWindowTextLength(hWnd);

                        // Does it have the text caption

                        if (length > 0)

                        {

                              sb = new StringBuilder(length + 1);

                              GetWindowText(hWnd, sb, sb.Capacity);

                              string text = sb.ToString();

                              text = text.Substring(0, text.IndexOf('\0'));

                              // Exclude some known system programs

                              if(!CheckExcludeList(text) && !CheckForDialogs(windowList, text))

                              {

                                    window = new Window();

                                    window.Handle = hWnd;

                                    window.Caption = text;

                                    windowList.Add(window);

                              }

                        }

                  }

            }

            hWnd = GetWindow(hWnd, GW_HWNDNEXT);

      }

      return (Window[])windowList.ToArray(typeof(Window));

}

And the additional P/Invoke declarations:

[DllImport("coredll.dll")]

static extern bool IsWindow(IntPtr handle);

 

 

[DllImport("coredll.dll")]

static extern bool IsWindowVisible(IntPtr handle);

           

And as a bonus here's a way to close the program:

[DllImport("coredll.dll")]

private extern static int SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

 

private static int WM_CLOSE  = 0x0010;

 

public static void CloseWindow(Window window)

{

      SendMessage(window.Handle, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

}

Here's the updated project:

EnumerateWindowsProjNew.zip (6.51 KB)

The .NetCF doesn't provide implementation for the DropDownWidth property for the ComboBox control. Even though it is just a simple call to send either CB_SETDROPPEDWIDTH or CB_GETDROPPEDWIDTH messages. So, following the extender pattern that I aleady used to create the ListBoxExtender I've created the ComboBoxExtender class that implements the DropDownWidth property:

public class ComboBoxExtender

{

      private ComboBox comboBox;

      private IntPtr handle;

 

      public ComboBoxExtender(ComboBox comboBox)

      {

            this.comboBox = comboBox;

            // Get native handle

            this.comboBox.Capture = true;

            this.handle = GetCapture();

            this.comboBox.Capture = false;

      }

 

      public int DropDownWidth

      {

            get

            {

                  return GetDropDownWidth();

            }

            set

            {

                  SetDropDownWidth(value);

            }

      }

 

      private void SetDropDownWidth(int width)

      {

            SendMessage(handle, CB_SETDROPPEDWIDTH, width, 0);

      }

 

      private int GetDropDownWidth()

      {

            return SendMessage(handle, CB_GETDROPPEDWIDTH, 0, 0);

      }

 

      #region P/Invokes

 

      const int CB_GETDROPPEDWIDTH    =      0x015f;

      const int CB_SETDROPPEDWIDTH    =      0x0160;

      [DllImport("coredll.dll")]

      static extern IntPtr GetCapture();

  

      [DllImport("coredll.dll")]

      static extern int SendMessage(IntPtr hwnd, int msg, int wParam, int lParam);

 

      #endregion

}

You would use this class:

private ComboBoxExtender comboExt;

…

 

comboExt = new ComboBoxExtender(comboBox1);

 

…

comboExt.DropDownWidth = 250;