PORTS Forum
Ports and Interfaces => USB => Topic started by: goodnewsjim on December 09, 2013, 03:05:31 pm
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Hello,
In code provided, there is a function called:
internal Boolean FindDeviceFromGuid(System.Guid myGuid, ref String devicePathName);
In it, you can find if new USB connections are being made.
I was thinking of having a main loop that checked this function every 3 seconds. But I wonder is that the proper way to detect if a USB connection has been made? Maybe there's an event that gets called when one gets plugged in that I am not aware of?
Some context:
1) Jan's code and my microchip code are working together and communicating nicely.
2) I'm adding new boards with different serial numbers.
3) I can detect the serial numbers on the boards and communicate to the right board.
What I am trying to do is make it so people can hot plug in new boards(same vendorid, same productid, dif serialid), and their serial numbers to be populated in a drop down menu(The guy with the arrow). Right now the list can't populate until I previously detected the USB connection has been made. It is a real simple problem which I can fix myself by calling FindDeviceFromGuid every 3 seconds. But I was just wondering if I'm solving this problem in the incorrect fashion. What is the right way to do this?
,Jim
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In the example code, take a look at:
AddDeviceArrivedHandler
AddDeviceRemovedHandler
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Hello Jan,
Thank you for the information. I have one more question.
Do you happen to remember where that example code is located at?
(on http://www.lvr.com/winusb.htm) I tried:
1)winusb_cs v2.1 for Visual C# .NET. Created with Visual Studio 2012 for the .NET Framework V4.0 or later. Uses WMI to detect device arrival and removal. Updated 10/18/13.
2)winusb_cs for Visual C# .NET v2.0. Created with Visual Studio 2012 for the .NET Framework V4.0 or later. Updated 5/3/12.
3)winusb_cs for Visual C# .NET. Created with Visual Studio 2008 for the .NET Framework V2.0 or later. Updated 2/11/09.
4)WinUSB Component for .Net. For bulk transfers. From Asaf Shelly.
Are there more examples than what is on that page? I also googled: AddDeviceArrivedHandler with no matches.
Thanks again, definitely getting your book. (edit just got it through a reference on your site :)
,Jim
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The newest version
http://www.janaxelson.com/winusb.htm
winusb_cs v2.1 for Visual C# .NET. Created with Visual Studio 2012 for the .NET Framework V4.0 or later. Uses WMI to detect device arrival and removal. Updated 10/18/13.
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Ah, thanks Jan,
You know what the problem is? I downloaded it and opened it with firefox's temporary directories. Apparently it didn't recognize all the files, so when I did a search for: AddDeviceArrivedHandler, nothing came up.
I'm good to go.
,Jim