Cancel modal dialogs in AutoCAD from a VB application

XDSoft

问题：

I am trying to get an interface pointer to the AutoCAD Application, using the
GetObject() from a VB client application.  But if a command or Modal dialog
(e.g. layer dialog) is active, then AutoCAD is not able to process the ActiveX
Automation request and  GetObject() fails.  How can I cancel any modal dialog
that s active in AutoCAD?

解答：

You can make use of Win32 API calls to enumerate the windows and then check
for the parent and window style of the window.  If the parent of a window is
"AutoCAD", then we know that it is a dialog related to AutoCAD.  Next, check
to see if the window style is of type WS_POPUPWINDOW and WS_VISIBLE.  If it
is, then we know this is a modal dialog active in AutoCAD.  The attached VB
sample shows how to implement the above.  Please refer to the Microsoft s MSDN
library (www.microsoft.com) for complete details on the Win32 API calls that
are used in this project.