Add FindWindowEx

[rhinosharp]

// here: findWindow *windows.LazyProc
findWindowEx *windows.LazyProc

// here: findWindow = libuser32.NewProc("FindWindowW")
findWindowEx = libuser32.NewProc("FindWindowExW")

//here: func FindWindow(lpClassName, lpWindowName *uint16) HWND {
// add by rhinosharp team
func FindWindowEx(hWndParent HWND, hWndChild HWND, lpClassName, lpWindowName *uint16) HWND {
ret, _, _ := syscall.Syscall6(findWindowEx.Addr(), 4,
uintptr(hWndParent),
uintptr(hWndChild),
uintptr(unsafe.Pointer(lpClassName)),
intptr(unsafe.Pointer(lpWindowName)),
0,
0)

return HWND(ret)
}

[rhinosharp]

example:
// StringToUTF16PtrElseNil String To UTF16Ptr if empty string trans to nil
func StringToUTF16PtrElseNil(str string) *uint16 {
if str == "" {
return nil
}
return syscall.StringToUTF16Ptr(str)
}

// FindWindow find window hwnd by name class="" if nil,nil mean ignore it
func FindWindow(class, title string) win.HWND {
var hwnd win.HWND
hwnd = win.FindWindow(StringToUTF16PtrElseNil(class), StringToUTF16PtrElseNil(title))
return hwnd
}

// FindWindowEx find window hwnd by name class="" if nil,nil mean ignore it
func FindWindowEx(hWndParent, hWndChild win.HWND, class, title string) win.HWND {
var hwnd win.HWND
hwnd = win.FindWindowEx(hWndParent, hWndChild,
StringToUTF16PtrElseNil(class),
StringToUTF16PtrElseNil(title))
return hwnd
}

[UDBIAWDIF]

// FindWindowEx find window hwnd by name class="" if nil,nil mean ignore it 这个注释要更新一下