EnumChildWindows (Win32 error 127) (c#)

[Ryan Ross]

Hello,

I am having the oddest error with the EnumChildWindow s function. Below are
the imports, and the methods.

[DllImport("user 32.dll", SetLastError=tr ue)]

public static extern int EnumChildWindow s(IntPtr hWndParent, EnumChildProc
callback, int lParam);

public delegate int EnumChildProc(I ntPtr hwnd, long lParam);



public void M_initChildWind ows()

{

if(WindowObject _Basic_GDI_Hand le != IntPtr.Zero)

{

try

{

User32.EnumChil dWindows(Window Object_Basic_GD I_Handle, new
User32.EnumChil dProc(M_addChil dWindows), 0);

}

catch(Exception e)

{

System.Diagnost ics.Debug.Write Line("Child Window failure: " +
e.Message);

}

}


}

private int M_addChildWindo ws(IntPtr Window, long Data)

{


if(Window != IntPtr.Zero)

{

ChildWindowObje ct_Basic c_WindowObject_ Basic = new
ChildWindowObje ct_Basic(Window );

c_WindowObject_ Basic_Array.Add (c_WindowObject _Basic);

}




return 1;

}



I keep getting a 127 error, even though it appears to enumerate the windows.
I placed it within a try statement to continue working other things, but
it's coming back to bite me in the ass.



Anyone have any ideas?



Thanks,

Ryan

[Nicholas Paldino [.NET/C# MVP]]

Re: EnumChildWindow s (Win32 error 127) (c#)

Ryan,

Your declaration of the callback delegate and function is incorrect. It
should be:

[DllImport("user 32.dll", SetLastError=tr ue)]
public static extern int EnumChildWindow s(IntPtr hWndParent, EnumChildProc
callback, IntPtr lParam);

public delegate int EnumChildProc(I ntPtr hwnd, IntPtr lParam);

LPARAM translates to an IntPtr.

Also, as an aside, you might want to check your publicly exposed method
names. They violate the public naming convention (M_initChildWin dows, for
example).

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Ryan Ross" <ryanr@nni.co m> wrote in message
news:5OmdnTWIFr 7rIbTeRVn-oA@nni.com...[color=blue]
> Hello,
>
> I am having the oddest error with the EnumChildWindow s function. Below are
> the imports, and the methods.
>
> [DllImport("user 32.dll", SetLastError=tr ue)]
>
> public static extern int EnumChildWindow s(IntPtr hWndParent, EnumChildProc
> callback, int lParam);
>
> public delegate int EnumChildProc(I ntPtr hwnd, long lParam);
>
>
>
> public void M_initChildWind ows()
>
> {
>
> if(WindowObject _Basic_GDI_Hand le != IntPtr.Zero)
>
> {
>
> try
>
> {
>
> User32.EnumChil dWindows(Window Object_Basic_GD I_Handle, new
> User32.EnumChil dProc(M_addChil dWindows), 0);
>
> }
>
> catch(Exception e)
>
> {
>
> System.Diagnost ics.Debug.Write Line("Child Window failure: " +
> e.Message);
>
> }
>
> }
>
>
> }
>
> private int M_addChildWindo ws(IntPtr Window, long Data)
>
> {
>
>
> if(Window != IntPtr.Zero)
>
> {
>
> ChildWindowObje ct_Basic c_WindowObject_ Basic = new
> ChildWindowObje ct_Basic(Window );
>
> c_WindowObject_ Basic_Array.Add (c_WindowObject _Basic);
>
> }
>
>
>
>
> return 1;
>
> }
>
>
>
> I keep getting a 127 error, even though it appears to enumerate the
> windows. I placed it within a try statement to continue working other
> things, but it's coming back to bite me in the ass.
>
>
>
> Anyone have any ideas?
>
>
>
> Thanks,
>
> Ryan
>
>[/color]