Using Window Handle to disable Mouse clicks and Keyboard Inputs using P/Invoke
- by srk
I need to disable the Mouse Clicks, Mouse movement and Keyboard Inputs for a specific windows for a Kiosk application. Is it feasible using .NET ?
I have removed the menu bar and title bar of a specific window, will that be a starting point to achieve the above requirement ?
The code for removing the menu bar and title bar using window handle :
#region Constants
//Finds a window by class name
[DllImport("USER32.DLL")]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
//Sets a window to be a child window of another window
[DllImport("USER32.DLL")]
public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
//Sets window attributes
[DllImport("USER32.DLL")]
public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
//Gets window attributes
[DllImport("USER32.DLL")]
public static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);
[DllImport("user32.dll")]
static extern IntPtr GetMenu(IntPtr hWnd);
[DllImport("user32.dll")]
static extern int GetMenuItemCount(IntPtr hMenu);
[DllImport("user32.dll")]
static extern bool DrawMenuBar(IntPtr hWnd);
[DllImport("user32.dll")]
static extern bool RemoveMenu(IntPtr hMenu, uint uPosition, uint uFlags);
//assorted constants needed
public static uint MF_BYPOSITION = 0x400;
public static uint MF_REMOVE = 0x1000;
public static int GWL_STYLE = -16;
public static int WS_CHILD = 0x40000000; //child window
public static int WS_BORDER = 0x00800000; //window with border
public static int WS_DLGFRAME = 0x00400000; //window with double border but no title
public static int WS_CAPTION = WS_BORDER | WS_DLGFRAME; //window with a title bar
public static int WS_SYSMENU = 0x00080000; //window menu
#endregion
public static void WindowsReStyle()
{
Process[] Procs = Process.GetProcesses();
foreach (Process proc in Procs)
{
if (proc.ProcessName.StartsWith("notepad"))
{
IntPtr pFoundWindow = proc.MainWindowHandle;
int style = GetWindowLong(pFoundWindow, GWL_STYLE);
//get menu
IntPtr HMENU = GetMenu(proc.MainWindowHandle);
//get item count
int count = GetMenuItemCount(HMENU);
//loop & remove
for (int i = 0; i < count; i++)
RemoveMenu(HMENU, 0, (MF_BYPOSITION | MF_REMOVE));
//force a redraw
DrawMenuBar(proc.MainWindowHandle);
SetWindowLong(pFoundWindow, GWL_STYLE, (style & ~WS_SYSMENU));
SetWindowLong(pFoundWindow, GWL_STYLE, (style & ~WS_CAPTION));
}
}
}
