Convert 'System.IntPtr' to 'System.Runtime.InteropServices.HandleRef' ?

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I want to view some information of a external Window (not from my application).
getting the IntPtr work but for the GetWindowRect i need a HandleRef, but How do I get this from the IntPtr as it would be more infromation.

The Code looks like:

C#

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetWindowRect(HandleRef hwnd, out RECT lpRect);

IntPtr hwnd = FindWindow(null, "WindowName");
RECT rct;

bool ret = GetWindowRect(hwnd, out rct); # Error (hwnd)

Problem:

Argument 1: cannot convert from 'System.IntPtr' to 'System.Runtime.InteropServices.HandleRef'

How can I convert the IntPtr to HandleRef?

Posted 27-Sep-11 0:54am

TomasEe

Updated 27-Sep-11 0:56am

v2

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Md. Rashim Uddin 28-Sep-11 1:35am

Did u try with given solutions???

1 solution

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Md. Rashim Uddin · Accepted Answer · 2011-09-27T01:11:00

Solution 1

Please have a look on that [^]

Another way you might use something like that

C#

GetWindowRect(new HandleRef(this, this.Handle), out rct )

Posted 27-Sep-11 1:11am

Md. Rashim Uddin

Updated 27-Sep-11 1:13am

v2

Comments

TomasEe 2-Oct-11 14:09pm

I do not realy understand why should use 'this'?

But the hint helped my ...
new HandleRef(NULL, hwnd);

Md. Rashim Uddin 2-Oct-11 14:16pm

See here this refers the current window. Better if you visit http://pinvoke.net/ and look on that.

AlexanderPD 1-Jul-14 4:46am

Thank you TomasEe, that was exatly what i needed ;)