.NET

[#1]

Hi

Is there a way to add a listener so I am told when escape(cancel command) is pressed? I want to create a cancel pressed event.

[#2 · Accepted solution]

This way can help you:

How to implement a Windows Hook using acedRegisterFilterWinMsg in .NET

In WindowHookProc event handler you can check msg.Msg == WM_KEYDOWN (0x0100)  and msg.WParam == VK_ESCAPE (0x1B)

[#3]

Thanks, that seems to work, but how do you unregister the listener? When escape is pressed I want to do something and then unregister the listener.

[#4 · Accepted solution]

In order to unregister this event handler use function acedRemoveFilterWinMsg:

BOOL acedRemoveFilterWinMsg(
    const AcedFilterWinMsgFn pfn
);

In C# it is look like:

// For AutoCAD 2013 64 bit
// On previous versions, import from acad.exe (instead accore.dll)
[DllImport("accore.dll",  CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, EntryPoint = "?acedRemoveFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z")]
private static extern int acedRemoveFilterWinMsg( WindowHookProc callBackFunc );

[#5]

Thank you very much.