comports - Developer IT

Getting Serial Port Information and Sorting the Results in C#

- by Jim Fell

I have some code that loads the serial ports into a combo-box: comboBoxComPort.Items.Add("Select COM port..."); foreach (string s in SerialPort.GetPortNames()) { comboBoxComPort.Items.Add(s); } comboBoxComPort.SelectedIndex = 0; Ideally, I would like to add the port descriptions to the list and sort the items in the list that are after index 0. Does anyone have any suggestions for doing this? Any thoughts you may have would be appreciated. Thanks.

Read the article

How can I fix "[Error 6] The handle is invalid." with PySerial

- by alnorth29

I'm trying to connect to my phone from my Windows 7 PC using PySerial with the following code: import wmi import serial c = wmi.WMI() modem = c.query("SELECT * FROM Win32_POTSModem").pop() ser = serial.Serial(modem.AttachedTo, modem.MaxBaudRateToSerialPort) try: ser.write('at \r\n') print ser.readline() finally: ser.close() But get the following error on the write call: Traceback (most recent call last): File "D:\Alasdair\Documents\Python Scripts\Phone Interface\test.py", line 14, in <module> ser.write('at \r\n') File "C:\Python26\Lib\site-packages\serial\serialwin32.py", line 255, in write raise SerialException("WriteFile failed (%s)" % ctypes.WinError()) SerialException: WriteFile failed ([Error 6] The handle is invalid.) I've tried connecting with TeraTerm and that works fine, so it's not a problem with the connection to the phone itself. I've been searching around for ages trying to find a solution but haven't come up with anything that works. Any ideas?

Read the article

Getting Serial Port Information in C#

- by Jim Fell

I have some code that loads the serial ports into a combo-box: List<String> tList = new List<String>(); comboBoxComPort.Items.Clear(); foreach (string s in SerialPort.GetPortNames()) { tList.Add(s); } tList.Sort(); comboBoxComPort.Items.Add("Select COM port..."); comboBoxComPort.Items.AddRange(tList.ToArray()); comboBoxComPort.SelectedIndex = 0; I would like to add the port descriptions (similar to what are shown for the COM ports in the Device Manager) to the list and sort the items in the list that are after index 0 (solved: see above snippet). Does anyone have any suggestions for adding the port descriptions? I am using Microsoft Visual C# 2008 Express Edition (.NET 2.0). Any thoughts you may have would be appreciated. Thanks.

Read the article

What is the best way to scan for COM ports in C#?

- by Jim Fell

Does C# provide an effective means of scanning the available COM ports? I would like to have a dropdown list in my application wherein the user can select one of the detected COM ports. Creating and populating the dropdown list is not a problem. I just need to know how to scan for the available COM ports using C#. I am using Microsoft Visual C# 2008 Express Edition. Thanks.

Read the article

Qt and serial port programming

- by vnm

Hi, folks ! Is there any serial port facilities in Qt ? If not, which crossplatform (desirable) libraries (for working with serial port and, maybe, with other I/O ports), do you recommend ?

Read the article

Ensure connection to a POSPrinter connected via COM

- by Alexander

Hi, I need to make sure that the connection to a POS printer is successful before writing data to the database and then printing a receipt. The POSprinter is normally of type BTP 2002NP but may differ. The common thing is that they are all connected via COM-port and NOT usb, so no drivers installed at all on the client. Can I send some kind of "ping" on a COM-port and check if a device is connected and turned on? Any help or suggestions are very much appreciated. Additional information, the application is developed in VB.net and Visual Studio 2008

Read the article

Checking COM Port Availability in C#

- by Jim Fell

Hello. My C# application populates a comboBox with the COM ports found on the system. I would like the mark the COM ports that are in use as such. I know that I can use try / catch blocks to attempt to open every COM port, but I was wondering if there is a more graceful way to do this. Perhaps using a WMI query? I am using Microsoft Visual C# 2008 Express Edition (.NET 2.0). Any thoughts or suggestions you may have would be appreciated. Thanks.

Read the article

howt to access COM port via script

- by mithunmo

Hello, I need to access COM port (console) via script to access our DSL modem. It should access in such a way that I can read all the messages printed on the console and i should also send commands to the console via script . Please let me know if it is possible in TCL or php . Platform : Windows XP. Also is there any way I can access the com port through script and console software such as teraterm simultaneously ? Regards, Mithun

Read the article

Windows: Does something temporarily grab the com ports on startup?

- by Tim

I have a WPF/C# app that is launched as part of the "Startup" group on a Windows Embedded Standard machine. One of the first things the app does (in its static App() method) is create a new SerialPort object for COM1. COM1 is a hardwired serial port, not a USB virtual port or anything like that. My problem is that every so often (maybe 1 out of 12) on startup, I get an exception: System.UnauthorizedAccessException: Access to the port 'COM1' is denied. There are no other applications using this port. Also, when I relaunch the app following this error, it grabs the port just fine. It's as if the com port isn't ready/set up for my app sometimes. I'm clueless on this one! Any insight is appreciated! UPDATE: I added a call to SerialPort.GetPortNames() and printout all available ports before attempting to open the port. In the failure case COM1 is indeed THERE! So, it's not that the port isn't ready. It looks like something in Windows is actually grabbing the port temporarily and blocking me.

Read the article

Which comm ports exist? Win32

- by myforwik

On win32, using winapi, is there anyway to know which comports (from com0 upwards) actually exist as devices? At the moment I am just attemping to open them all (0 to 9), but I can't figure out the difference of failure between one not existing, and one not simply being available for use because someone else is using it. Both situations seem to return the same last error, so I was wondering if I could list all the comports available on the system.

Developer IT