Then I plug the cable again and reconnect to the port. Tags: Like 0 members like this Share Tweet Views: 831 ▶ Reply to This Replies to This Discussion DeveloperPermalink Reply by Michael Oborne on October 11, 2013 at 7:42pm usualy this Even funnier I even can read port and write to it after replugging!) but after some time UnauthorizedAccessException saying "Access to the port is denied" is thrown. I have a try catch block that detects the dissapearrence of the COM port. Source
Anyway thanks for your help. –Ping May 19 '14 at 5:52 Thanks i change the port to a definitely not in used port which is COM17. I don't know whether your application is coded like that. Already have an account? It means the Close() call was successful. https://social.msdn.microsoft.com/Forums/vstudio/en-US/a33e96cf-efbf-4ffa-88f0-949062f174b6/serialport-open-throwing-an-exception-access-to-the-port-com1-is-denied?forum=csharpgeneral
reboot your pc, and open just MP and see if that works. ▶ Reply Permalink Reply by Eric on October 11, 2013 at 8:26pm Alright I tried that and the computer February 23rd, 2010, 12:16 PM pbutala Re: UnauthorizedAccessException when accessing Virtual COM port Mr. All contents are copyright of their authors. Notice that it's not the Close() that throws the exception.
View All Notifications Email : * Password : * Remember me Forgot password? If you want exceptions in a worker thread to be translated back to the thread which originally started the worker thread you have 2 options : (1) Trap them yourself using Thank you all for the help. Portmon For Windows share|improve this answer answered May 15 '14 at 8:00 Ove 4,06012250 If there is other program accessing COM1 port, can i change the port number that my RFID device
That's what I'd prefer, either. Aug 06, 2012 01:33 AM|Ramesh Chandra|LINK you are giving permission in right way. Considering we don't explicitly set any SemaphoreSecurity settings to deny access it seems unlikely that these settings are relevant. this share|improve this answer answered Aug 28 '11 at 11:09 Hans Passant 668k829881652 YES!!!
It just gives me thaterror. How To Use Portmon I connect my USB cable to the PC and pull it while data is being transmitted. It's also possible to make a hardware modification to the board to suppress the reset. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed
You can check what programs use what ports using Portmon. I just quoted the text from the Microsoft answer in the microsoft connect website. Access To The Port Com1 Is Denied Windows 7 Monday, March 01, 2010 3:35 AM Reply | Quote 0 Sign in to vote Second option worked for me! Unable To Open Serial Port Com1 Access Is Denied The amount of time is unspecified and unpredictable.
now the exception is thrown when my app exits.... http://twaproductions.com/is-denied/visual-studio-access-is-denied.html My app opens the port and closes it correctly, if I disconnect the USB cable from the device before calling SerialPort.Close(), then the UnauthorizedAccessException is thrown. Microsoft (in the link posted by MontgomeryBurns) say that they thought it better to throw an exception to inform the client application that something was wrong - and I agree with I tried the config file but it did not work :(. Windows 10 Com Port Access Denied
You signed out in another tab or window. Ultimately, the application will crash.This issue has been reported to Microsoft here. I tried trapping it like this: Code: [STAThread]
static void Main(string argv)
have a peek here In how many bits do I fit Why does creating a new account and making it an administrator require system restart?
If this post answered your question or solved your problem, please Mark it as Answer. Primopdf Exception Access To The Port Is Denied February 23rd, 2010, 12:33 PM pbutala Re: UnauthorizedAccessException when accessing Virtual COM port maybe i was a little too hasty posting that last post ! .. The GUI can detect the presence of the device and connect or reconnect automatically multiple times, but would raise the aformentioned exception upon exit.
February 2nd, 2009, 06:58 AM MontgomeryBurns Re: UnauthorizedAccessException when accessing Virtual COM port Quote: Or even better, I'd suggest trapping the exception (try/catch) and handling it. View my complete profile Blog Archive ▼ 2011 (10) ▼ Dec 2011 (1) System.UnauthorizedAccessException: Access to the ... ► Sep 2011 (1) ► Jul 2011 (1) ► Jun 2011 (2) ► The exception is trapped by the framework on the thread that executes the delegate and automatically re-thrown in response to an EndInvoke on whichever thread EndInvoke is called on. Check This Out View All Messages No new notifications.
Reply Mamba Dai -... Googling for things like "how to read a serial port in windows using C++" turns up loads of answers. Is the Nintendo network ban tied to NNID or the console? In my case 250 ms were sufficient.
Related 0accessing COM port using ASP.net : access denied4COM port is denied1Access to the port 'COM5' is denied0Access To Com Port Is Denied (when detach the port cable)0Boost serial communication, COM February 2nd, 2009, 03:19 AM MontgomeryBurns Re: UnauthorizedAccessException when accessing Virtual COM port I solved my problem adding a config file to my Visual Studio C# project. If you're using asynchronous operation you should then handle the completed event to GCHandle.Free the pinned pointer once the asynchronous write has finished. That's why, when I rerun my Test, the check 'serialPort.IsOpen() return 'false'...i.e, serialPort is NOT Open().