[elesbb]

I am trying to show the desktop on a windows mobile 6.5.5 device . I have this much .

using Shell32;
            Shell32.ShellClass shell = new Shell32.ShellClass();
            shell.MinimizeAll();

this is executed after taping a button .

everything gets compiled just fine but when i emulate the program i get this error upon tapping the button .

COM object with CLSID '{13709620-C279-11CE-A49E-444553540000}' cannot be created due to the following error: Class not registered 

im not exactly sure what this means . ive googled my little heart out . and all i found was that i had to implement the Shell32.dll which i did .

I appologize for any things ive done wrong in my posting . but im lost .

thanks everyone for your help !

[eclipsed4utoo]

I found this link over at StackOverflow which seems to do exactly what you want, but uses PInvoke instead.

http://stackoverflow...dows-in-c-sharp

This was the code that was posted as the answer...

using System;
using System.Runtime.InteropServices;

namespace ConsoleApplication1 {
class Program {
    [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
    static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
    [DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true)]
    static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, IntPtr lParam);

    const int WM_COMMAND = 0x111;
    const int MIN_ALL = 419;
    const int MIN_ALL_UNDO = 416;

    static void Main(string[] args) {
        IntPtr lHwnd = FindWindow("Shell_TrayWnd", null);
        SendMessage(lHwnd, WM_COMMAND, (IntPtr)MIN_ALL, IntPtr.Zero); 
        System.Threading.Thread.Sleep(2000);
        SendMessage(lHwnd, WM_COMMAND, (IntPtr)MIN_ALL_UNDO, IntPtr.Zero);
    }
}
}

[elesbb]

eclipsed4utoo, on 08 December 2011 - 01:37 PM, said:

I found this link over at StackOverflow which seems to do exactly what you want, but uses PInvoke instead.

http://stackoverflow...dows-in-c-sharp

This was the code that was posted as the answer...

using System;
using System.Runtime.InteropServices;

namespace ConsoleApplication1 {
class Program {
    [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
    static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
    [DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true)]
    static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, IntPtr lParam);

    const int WM_COMMAND = 0x111;
    const int MIN_ALL = 419;
    const int MIN_ALL_UNDO = 416;

    static void Main(string[] args) {
        IntPtr lHwnd = FindWindow("Shell_TrayWnd", null);
        SendMessage(lHwnd, WM_COMMAND, (IntPtr)MIN_ALL, IntPtr.Zero); 
        System.Threading.Thread.Sleep(2000);
        SendMessage(lHwnd, WM_COMMAND, (IntPtr)MIN_ALL_UNDO, IntPtr.Zero);
    }
}
}

thanks , just a little confused , im using Visual Studio 2008 C# . i visited the link and it says C++ ?

PS Sorry for not posting in the right section . i posted in C# because my phone isnt technically a "Windows Phone" its windows mobile . but thanks i know now .

[elesbb]

Copied the text into Visual Studio and i compiled and i get this error when trying to run .

Can't find PInvoke DLL 'user32.dll'

[eclipsed4utoo]

I found this on another forum.

Quote

user32.dll doesn't exist in CE. Use coredll.dll

So you would change these two lines...

[DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
[DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true)]

to

[DllImport("coredll.dll", EntryPoint = "FindWindow", SetLastError = true)]
[DllImport("coredll.dll", EntryPoint = "SendMessage", SetLastError = true)]

See if that works for you.