C# get child handles using FindWindowEx by name and ordinal number

According to (v=vs.85).aspx I define FindWindowEx function.

using System.Runtime.InteropServices; [DllImport("user32.dll", CharSet=CharSet.Unicode)] static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string lclassName, string windowTitle); 

Now I am able to find first handle of "Button" control (get name from Spy++) setting childAfter as IntPtr.Zero.

IntPtr hWndParent = new IntPtr(2032496); // providing parent window handle IntPtr hWndButton = FindWindowEx(hWndParent, IntPtr.Zero, "Button", string.Empty); 

How to get second, third or any handle of "Button" control inside that parent window? The fact is, button titles may vary, so I cannot find them directly by name defining fourth parameter.

1 Answer

static IntPtr FindWindowByIndex(IntPtr hWndParent, int index) { if (index == 0) return hWndParent; else { int ct = 0; IntPtr result = IntPtr.Zero; do { result = FindWindowEx(hWndParent, result, "Button", null); if (result != IntPtr.Zero) ++ct; } while (ct < index && result != IntPtr.Zero); return result; } } 

Use like:

IntPtr hWndThirdButton = FindWindowByIndex(hWnd, 3); // handle of third "Button" as shown in Spy++