EnumWindows

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Hello, Newsgroupians:

I've a question regarding the Win32 function EnumWindows. First, the
prototype for EnumWindows is as follows...

BOOL EnumWindows(WNDENUMPROC lpEnumFunc, LPARAM lParam)

As such, I have declared the following...

[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int EnumWindows(EnumWindowsProcDelegate lpEnumFunc,
IntPtr lParam];
private delegate int EnumWindowsProcDelegate(IntPtr hwnd, IntPtr lParam);

Now, I'd like to call the EnumWindows. When it finds a specific window I'm
looking for, I want the lParam to be the return value of that specific
window. Here's an example...

IntPtr hwnd = new IntPtr();
EnumWindows(new EnumWindowsProcDelegate(EnumWndProc), hwnd);
....

private static int EnumWndProc(IntPtr hwnd, IntPtr lParam)
{
// For simplicity, the first window I find will be set to the lParam
lParam = hwnd;
}

However, after calling EnumWindows(...), hwnd is always 0x00000000 after the
EnumWndProc. As such, I tried the GCHandle, but I still get no where. Does
anyone know what I can do to return a client handle in the lParam?

Thank you, all.
Trecius

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

Trecius,

I would use an anonymous method to do this, like so:

IntPtr value = IntPtr.Zero;
IntPtr hwnd = IntPtr.Zero;

EnumWindows(delegate(IntPtr hwnd, IntPtr lParam)
{
// Set the value variable based on your condition.
value = < whatever >;
}, hwnd);

Then, when you run EnumWindows, it will set the value variable, and you
can use it from there.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Trecius" <Tr*****@discussions.microsoft.comwrote in message
news:30**********************************@microsof t.com...

Hello, Newsgroupians:

I've a question regarding the Win32 function EnumWindows. First, the
prototype for EnumWindows is as follows...

BOOL EnumWindows(WNDENUMPROC lpEnumFunc, LPARAM lParam)

As such, I have declared the following...

[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int EnumWindows(EnumWindowsProcDelegate lpEnumFunc,
IntPtr lParam];
private delegate int EnumWindowsProcDelegate(IntPtr hwnd, IntPtr lParam);

Now, I'd like to call the EnumWindows. When it finds a specific window
I'm
looking for, I want the lParam to be the return value of that specific
window. Here's an example...

IntPtr hwnd = new IntPtr();
EnumWindows(new EnumWindowsProcDelegate(EnumWndProc), hwnd);
...

private static int EnumWndProc(IntPtr hwnd, IntPtr lParam)
{
// For simplicity, the first window I find will be set to the lParam
lParam = hwnd;
}

However, after calling EnumWindows(...), hwnd is always 0x00000000 after
the
EnumWndProc. As such, I tried the GCHandle, but I still get no where.
Does
anyone know what I can do to return a client handle in the lParam?

Thank you, all.
Trecius