private void Install(InstalledHook toInstall)
{
//the corresponding windows APIs work only with the obsolete method!
#pragma warning disable 0618
int threadId = AppDomain.GetCurrentThreadId();
#pragma warning restore 0618
if ((toInstall & InstalledHook.CallWndProc) != 0 &&
(this.installedHook & InstalledHook.CallWndProc) == 0)
{
this.callWndProcHookAddress = SetWindowsHookEx(HookType.WH_CALLWNDPROC, this.callWndProcDelegate, IntPtr.Zero, threadId);
this.installedHook |= InstalledHook.CallWndProc;
}
if ((toInstall & InstalledHook.GetMessage) != 0 &&
(this.installedHook & InstalledHook.GetMessage) == 0)
{
this.getMessageHookAddress = SetWindowsHookEx(HookType.WH_GETMESSAGE, this.getMessageDelegate, IntPtr.Zero, threadId);
this.installedHook |= InstalledHook.GetMessage;
}
if ((toInstall & InstalledHook.SystemMessage) != 0 &&
(this.installedHook & InstalledHook.SystemMessage) == 0)
{
this.systemMessageHookAddress = SetWindowsHookEx(HookType.WH_MSGFILTER, this.systemMessageDelegate, IntPtr.Zero, threadId);
this.installedHook |= InstalledHook.SystemMessage;
}
}
private void Uninstall(InstalledHook toUninstall)
{
if ((toUninstall & InstalledHook.CallWndProc) != 0 &&
(this.installedHook & InstalledHook.CallWndProc) != 0)
{
UnhookWindowsHookEx(this.callWndProcHookAddress);
this.callWndProcHookAddress = IntPtr.Zero;
this.installedHook &= ~InstalledHook.CallWndProc;
}
if ((toUninstall & InstalledHook.GetMessage) != 0 &&
(this.installedHook & InstalledHook.GetMessage) != 0)
{
UnhookWindowsHookEx(this.getMessageHookAddress);
this.getMessageHookAddress = IntPtr.Zero;
this.installedHook &= ~InstalledHook.GetMessage;
}
if ((toUninstall & InstalledHook.SystemMessage) != 0 &&
(this.installedHook & InstalledHook.SystemMessage) != 0)
{
UnhookWindowsHookEx(this.systemMessageHookAddress);
this.systemMessageHookAddress = IntPtr.Zero;
this.installedHook &= ~InstalledHook.SystemMessage;
}
}
private RadMessageFilter()
{
this.getMessageDelegate = new RadMessageFilter.HookProc(this.GetMessageHookProc);
this.callWndProcDelegate = new RadMessageFilter.HookProc(this.CallWndProcHookProc);
this.systemMessageDelegate = new RadMessageFilter.HookProc(this.SystemMessageHookProc);
this.installedHook = InstalledHook.None;
this.listeners = new WeakReferenceList <IMessageListener>(true);
this.enabled = true;
}
/// <summary>
/// Verifies that all the needed hooks are installed (depending on each listener's DesiredHook).
/// </summary>
private void EnsureInstalledHooks()
{
//we are not enabled, do nothing
if (!this.enabled)
{
return;
}
InstalledHook desiredHook = this.GetDesiredHook();
if (this.installedHook == desiredHook)
{
return;
}
InstalledHook toInstall = InstalledHook.None;
InstalledHook toUninstall = InstalledHook.None;
if ((desiredHook & InstalledHook.CallWndProc) == InstalledHook.CallWndProc)
{
toInstall |= InstalledHook.CallWndProc;
}
else
{
toUninstall |= InstalledHook.CallWndProc;
}
if ((desiredHook & InstalledHook.GetMessage) == InstalledHook.GetMessage)
{
toInstall |= InstalledHook.GetMessage;
}
else
{
toUninstall |= InstalledHook.GetMessage;
}
if ((desiredHook & InstalledHook.SystemMessage) == InstalledHook.SystemMessage)
{
toInstall |= InstalledHook.SystemMessage;
}
else
{
toUninstall |= InstalledHook.SystemMessage;
}
this.Install(toInstall);
this.Uninstall(toUninstall);
}
private void Install(InstalledHook toInstall)
{
int currentThreadId = AppDomain.GetCurrentThreadId();
if ((toInstall & InstalledHook.CallWndProc) != InstalledHook.None && (this.installedHook & InstalledHook.CallWndProc) == InstalledHook.None)
{
this.callWndProcHookAddress = RadMessageFilter.SetWindowsHookEx(RadMessageFilter.HookType.WH_CALLWNDPROC, this.callWndProcDelegate, IntPtr.Zero, currentThreadId);
this.installedHook |= InstalledHook.CallWndProc;
}
if ((toInstall & InstalledHook.GetMessage) != InstalledHook.None && (this.installedHook & InstalledHook.GetMessage) == InstalledHook.None)
{
this.getMessageHookAddress = RadMessageFilter.SetWindowsHookEx(RadMessageFilter.HookType.WH_GETMESSAGE, this.getMessageDelegate, IntPtr.Zero, currentThreadId);
this.installedHook |= InstalledHook.GetMessage;
}
if ((toInstall & InstalledHook.SystemMessage) == InstalledHook.None || (this.installedHook & InstalledHook.SystemMessage) != InstalledHook.None)
{
return;
}
this.systemMessageHookAddress = RadMessageFilter.SetWindowsHookEx(RadMessageFilter.HookType.WH_MSGFILTER, this.systemMessageDelegate, IntPtr.Zero, currentThreadId);
this.installedHook |= InstalledHook.SystemMessage;
}
private InstalledHook GetDesiredHook()
{
InstalledHook installedHook = InstalledHook.None;
foreach (IMessageListener listener in this.listeners)
{
InstalledHook desiredHook = listener.DesiredHook;
if ((desiredHook & InstalledHook.CallWndProc) == InstalledHook.CallWndProc)
{
installedHook |= InstalledHook.CallWndProc;
}
if ((desiredHook & InstalledHook.GetMessage) == InstalledHook.GetMessage)
{
installedHook |= InstalledHook.GetMessage;
}
if ((desiredHook & InstalledHook.SystemMessage) == InstalledHook.SystemMessage)
{
installedHook |= InstalledHook.SystemMessage;
}
}
return(installedHook);
}
private void Uninstall(InstalledHook toUninstall)
{
if ((toUninstall & InstalledHook.CallWndProc) != InstalledHook.None && (this.installedHook & InstalledHook.CallWndProc) != InstalledHook.None)
{
RadMessageFilter.UnhookWindowsHookEx(this.callWndProcHookAddress);
this.callWndProcHookAddress = IntPtr.Zero;
this.installedHook &= ~InstalledHook.CallWndProc;
}
if ((toUninstall & InstalledHook.GetMessage) != InstalledHook.None && (this.installedHook & InstalledHook.GetMessage) != InstalledHook.None)
{
RadMessageFilter.UnhookWindowsHookEx(this.getMessageHookAddress);
this.getMessageHookAddress = IntPtr.Zero;
this.installedHook &= ~InstalledHook.GetMessage;
}
if ((toUninstall & InstalledHook.SystemMessage) == InstalledHook.None || (this.installedHook & InstalledHook.SystemMessage) == InstalledHook.None)
{
return;
}
RadMessageFilter.UnhookWindowsHookEx(this.systemMessageHookAddress);
this.systemMessageHookAddress = IntPtr.Zero;
this.installedHook &= ~InstalledHook.SystemMessage;
}