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Add support for the CancelKeyPress event on Windows #25

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Add support for the CancelKeyPress event on Windows #25

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37 changes: 37 additions & 0 deletions mcs/class/corlib/System/Console.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -44,11 +44,26 @@ public static class Console
#if !NET_2_1
private class WindowsConsole
{
public static bool ctrlHandlerAdded = false;
private delegate bool WindowsCancelHandler (int keyCode);
private static WindowsCancelHandler cancelHandler = new WindowsCancelHandler (DoWindowsConsoleCancelEvent);

[DllImport ("kernel32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
private static extern int GetConsoleCP ();
[DllImport ("kernel32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
private static extern int GetConsoleOutputCP ();

[DllImport ("kernel32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
private static extern bool SetConsoleCtrlHandler (WindowsCancelHandler handler, bool addHandler);

// Only call the event handler if Control-C was pressed (code == 0), nothing else
private static bool DoWindowsConsoleCancelEvent (int keyCode)
{
if (keyCode == 0)
DoConsoleCancelEvent ();
return keyCode == 0;
}

[MethodImpl (MethodImplOptions.NoInlining)]
public static int GetInputCodePage ()
{
Expand All @@ -60,6 +75,18 @@ public static int GetOutputCodePage ()
{
return GetConsoleOutputCP ();
}

public static void AddCtrlHandler ()
{
SetConsoleCtrlHandler (cancelHandler, true);
ctrlHandlerAdded = true;
}

public static void RemoveCtrlHandler ()
{
SetConsoleCtrlHandler (cancelHandler, false);
ctrlHandlerAdded = false;
}
}
#endif
internal static TextWriter stdout;
Expand Down Expand Up @@ -682,12 +709,22 @@ public static event ConsoleCancelEventHandler CancelKeyPress {
ConsoleDriver.Init ();

cancel_event += value;

if (Environment.IsRunningOnWindows && !WindowsConsole.ctrlHandlerAdded)
WindowsConsole.AddCtrlHandler();
}
remove {
if (ConsoleDriver.Initialized == false)
ConsoleDriver.Init ();

cancel_event -= value;

if (cancel_event == null && Environment.IsRunningOnWindows)
{
// Need to remove our hook if there's nothing left in the event
if (WindowsConsole.ctrlHandlerAdded)
WindowsConsole.RemoveCtrlHandler();
}
}
}

Expand Down