QueryOpen Property

Allows to react on virtual serial port opening. So, application can allow or prohibit access to the serial port.

Access

Read/Write

Syntax

Visual Basic
QueryOpen As Boolean
Delphi
QueryOpen: Boolean;
Visual C++ (MFC)
BOOL get_QueryOpen(); 
void put_QueryOpen(BOOL value);   
Visual C++ (#import)
VARIANT_BOOL QueryOpen;

Remarks

If FALSE, the port can be opened by any application.
If TRUE, it is not possible to open port if your application is not attached to the port (refer to Attach). ERROR_ACCESS_DENIED error code is returned in such case. If attached, OnQueryOpen event fires and the event handler decides, if it is allowed to open virtual serial port to the application or not.
FALSE by default.