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Windows detects the removal of open commports immedeately, as you can observe in the device manager. Once disconnected and connected again, it is a complete new port and can be opened.
Another thing is how the running program is informed about the removal.
I found a very simple solution to end my ...

infratec, yes, that's what my program is doing, but vice versa.
I only read data from the device, and use AvailableSerialPortInput() until there is no more input.

Since I set the system time, administrator prvileges are required. When I start the program in the IDE, the debugger window opens. When I disconnect the GPS, nothing happens. When I reconnect the GPS and start the program, no error message, a second instance of the debugger appears.
When I start the ...

Plouf, tnx for your suggestion, but the result is the same.

I have an application in which a GPS-Mouse is used to keep time synch. The GPS is connected to the PC via USB.
Everything is working OK. The application has no user surface, so to end the program, I have included the following code.

If Not IsSerialPort(0)
End
EndIf

When I disconnect the GPS ...

I had never created a DLL, but today i did it, or better said, I tried it. I took the simple example from the help (how to create a DLL). The DLL was built and stored, but when I tried to use it, I got an error message which said, that the DLL is either not for Windows or is faulty. I tried it ...

OK gentlemen, thanks for your explanations.
@netmaestro
That was an impressive demonstration.

@RASHAD

The use of Window callback makes my simple program too complicated.

@Kukulkan

the parent window is not a PB window. I had to use the API function FindWindow() to get the handle.

In a few Windows applications I expand the functionality by positioning own windows on the application window.
On these windows gadgets with the desired functions are placed. That works for me, but when the main window is
moved, the additional windows stay where they are.
Then I had the idea, to ...

@JHPJHP
Thanks for your reply.
When the external window is open, WWatcher shows the data of the window.
The only event WWatcher reacts on is when a subwindow is opened and closed.

I have an external Windows program which I use frequently.
There are some controls on the window of that program, but EnumChildWindows() gives no result.
And when I explore the window with an analyze program, in my case 'Windowse', there is also no child window.
So it's obvious, that the program isn ...

Bernd,

my post doesn't show a trick, it's just a tip for those who are not so familiar with the serial interface.
I have tried com0com as well, but IMHO VSPManager is the easiest way to create and delete virtual comm ports.

Alles Gute noch im Neuen Jahr.

Reinhard

I have an external application and my own one, both must have access to the same comm port.
This is not possible under Windows. Only the application which has opened the port has access to it.
The access by the external program is minimal: just setting the state of the RTS line to switch a device on ...

Alles klar, Bernd.