/// <summary>
/// Allow lower integrity applications to send specified window messages
/// in case we are elevated. Failure is non-fatal and on down-level
/// platforms this call will result in a no-op.
/// </summary>
private void ChangeWindowMessageFilter(WindowMessage message, uint flag)
{
// Find the address of ChangeWindowMessageFilter in user32.dll.
IntPtr user32Module = UnsafeNativeMethods.GetModuleHandle("user32.dll");
// Get the address of the function. If this fails it means the OS
// doesn't support this function, in which case we don't
// need to do anything further.
IntPtr functionAddress = UnsafeNativeMethods.GetProcAddressNoThrow(
new HandleRef(null, user32Module),
"ChangeWindowMessageFilter");
if (functionAddress != IntPtr.Zero)
{
// Convert the function pointer into a callable delegate and then call it
ChangeWindowMessageFilterNative function = Marshal.GetDelegateForFunctionPointer(
functionAddress,
typeof(ChangeWindowMessageFilterNative)) as ChangeWindowMessageFilterNative;
// In order to call the function we need unmanaged code access,
// because the function is native code.
(new SecurityPermission(SecurityPermissionFlag.UnmanagedCode)).Assert();
try
{
function(message, flag);
}
finally
{
SecurityPermission.RevertAssert();
}
}
}
/// <summary>
/// Allow lower integrity applications to send specified window messages
/// in case we are elevated. Failure is non-fatal and on down-level
/// platforms this call will result in a no-op.
/// </summary>
private void ChangeWindowMessageFilter(WindowMessage message, uint flag)
{
// Find the address of ChangeWindowMessageFilter in user32.dll.
IntPtr user32Module = UnsafeNativeMethods.GetModuleHandle("user32.dll");
// Get the address of the function. If this fails it means the OS
// doesn't support this function, in which case we don't
// need to do anything further.
IntPtr functionAddress = UnsafeNativeMethods.GetProcAddressNoThrow(
new HandleRef(null, user32Module),
"ChangeWindowMessageFilter");
if (functionAddress != IntPtr.Zero)
{
// Convert the function pointer into a callable delegate and then call it
ChangeWindowMessageFilterNative function = Marshal.GetDelegateForFunctionPointer(
functionAddress,
typeof(ChangeWindowMessageFilterNative)) as ChangeWindowMessageFilterNative;
function(message, flag);
}
}
