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Tiling and Cascading windows

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Peter McElroy

Hi,

I'm trying to add "Cascade" windows functionality in a C# SDI application,
using the win32 API call:

WORD CascadeWindows( HWND hwndParent,
UINT wHow,
const RECT *lpRect,
UINT cKids,
const HWND *lpKids
);

I've being trying to use the API in the following way, however it is not
cascading the four windows I am passing to it in the windowArray parameter,
instead it cascades my version of Visual Studio that the Application is
being run from:

[DllImport("user32")] public static extern short CascadeWindows(int
hwndParent,
int wHow, int lpRect, int cKids, ref System.IntPtr[] lpKids);

public void Cascade(Form[] arrangeWindows )
{
int index = 0;
System.IntPtr[] windowArray = new
System.IntPtr[arrangeWindows.Length];
foreach(Form arrangeWindow in arrangeWindows)
{
windowArray[index++] = arrangeWindow.Handle;
}

User32.CascadeWindows(0, 0, 0, windowArray.Length, ref windowArray);
}

Any ideas what I am doing wrong?

Thanks in Advance for any Help :-)-Peter Mc

Reply to this message...

Robert Jordan

Hi Peter McElroy,

[Original message clipped]

The hwndParent (1st param) must be an IntPtr.

[Original message clipped]

You have to pass the MDI parent form's Handle an the
first argument to CascadeWindow.

bye
Rob

Reply to this message...

Robert Jordan

[Original message clipped]

Ahh, it's actually a SDI-apllication ;-)
Then pass the Main form's Handle to CascadeWindows.

bye
Rob

Reply to this message...

Peter McElroy

Hi Rob,

Thanks for the help, I tried setting the main form so that the code now
looks like this:

[DllImport("user32")] public static extern short
CascadeWindows(System.IntPtr hwndParent,
int wHow, int
lpRect, int cKids, ref System.IntPtr[] lpKids);

public void Cascade(Form[] arrangeWindows )
{

System.IntPtr[] windowArray = new System.IntPtr[arrangeWindows.Length];
foreach(Form arrangeWindow in arrangeWindows)
{
windowArray[index++] = arrangeWindow.Handle;
}

User32.CascadeWindows(this.MainForm.Handle, 0, 0, windowArray.Length,
ref windowArray);
}

Unfortunately it is still not working, I'm wondering if I need to specify
the lpRect and wHow parameters,
and if so how I would do this in c#, any Ideas ?

Thanks again :-)
-Peter Mc

"Robert Jordan" <Click here to reveal e-mail address> wrote in message
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[Original message clipped]

Reply to this message...

Robert Jordan

Peter McElroy wrote:

[Original message clipped]

static extern short CascadeWindows(IntPtr hwndParent, uint wHow,
IntPtr lpRect, uint cKids, IntPtr[] lpKids);

"ref System.IntPtr[] lpKids" is wrong.

[Original message clipped]

According to the docs, lpRect can be IntPtr.Zero.

bye
Rob

Reply to this message...

Peter McElroy

Hi Rob,

Thats got it working Thanks! :-)

Cheers
-Peter Mc

"Robert Jordan" <Click here to reveal e-mail address> wrote in message
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System.IntPtr

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