I need a program to show which programs or processes use the COM ports.
I found some programs that monitor the COM ports such as Device Monitoring studio, .... but this program does not show which programs use the port.
Do you know a software for my problem?
thanks
Try Process Explorer.
Search for "serial" using ctrl-f.
https://technet.microsoft.com/en-us/sysinternals/processexplorer.aspx
Related
I wish to write a Linux device driver which spawns a thread which listens to the comport on /dev/ttyAMA0.
On the comport is an rf device which connects to a host of other devices. I wish I add each rf device as I discover them as if they were physical devices to Linux and upon probing the parameters of each device add files for controlling the device parameters.
I have done quite a bit of searching around this and have already done many of the simple hello world driver tutorials and found how to spawn threads from within a driver.
I already know how to read/write to the comport from user-land c.
My question is; is this approach OK? i.e. a driver which can spawn multiple devices. Should this instead be a service? How about reading/writing to the comport from another device is this ok? What are the best practices? Examples?
N.B. I realise I will have to control access to the comport. I am choosing to ignore that complexity for the moment, but I will achieve this via some sort of semaphore.
This is for a personal project by day I'm mainly a c# developer.
EDIT
I have found this related question, I don't however believe it to be a duplicate. I think recommends not to write drivers over drivers. But I wish to add these external devices as if they were physical devices.
I'm writing some code in C for an IrDA project on one win7 32bit computer. I have another computer setup to display any data received via in infrared. This part works. However the as soon as I connect the IrDA dongle to the PC, it starts to send periodic data for searching other IrDA devices. I want to disable this behavior programmatically so I see only the data sends as a result of my code. Anyone know which command to use? Is it WSASetService? I didn't learn socket programming, not sure what "removes from the registry a service instance within one or more namespaces. " really means. http://msdn.microsoft.com/en-us/library/windows/desktop/ms742211%28v=vs.85%29.aspx
Have you disabled the Infrared Monitor Service manually?
I experienced problems with this functionality in win7 when using Windows to communicating with an embedded micro-controller based device that worked well with windows XP.
I disabled the Infrared Monitor Service manually and found that windows was still polling the IrDA periodically!
I have not found any documentation available that describes it or how to disable it, I will continue searching...
I just read in a few articles that we need some kind of special drivers for parallel port to access it through C as in win xp and 7 we cannot access them directly.
Can someone help me do this?
Correct. You need driver to access ports. If your purpose is to just read write data to ports for experimentation, you can use the sample(WinDDK\7600.16385.1\src\general\portio) provided with WDK to experiment with ports. The sample provides driver that you can build and install
and gives a sample user mode program describing how to use the Ioctls to achieve the desired port IO.
I bought a usb otoscope from the internet and I want to create an application that uses it. When I plug it into the computer, it reads the device as a USB Camera, and I can use the very barebones software supplied to communicate with it. I'm very new to the idea of communicating with usb all together. I've tried to look at some sites like this: http://www.jespersaur.com/drupal/book/export/html/21, that tell me how to reverse engineer a device. I don't know if I'm going down the right path with this...
I've downloaded USB Snoopy and I can't seem to get it to sniff the packets correctly. I also have Crunchbang linux installed on a different computer but I don't know how to sniff it on that either (especially because the drivers are native to windows). All I want is some sort of API/Interfacing functions for me to call and use. How do I go about doing such a thing? I'm able to locate the device on the device manager in windows, and it tells me hardware ID's and such. I can supply any information if necessary. Thank you.
EDIT - Small description I found of the otoscope: http://microscopesimgv.blogspot.com/2012/08/oasis-ehev2-usbplus-20mp-handheld-usb.html
would this tool help you any?libusbx is a cross-platform user mode library that provides generic access to USB devices
CHEERS!
Where can I find an example program in C to print to a network attached HP printer.
Printing requires a printer driver which handles all the task of communication with the printer.
all you have to worry about is how to print, the fact that the printer is networked or usb or parallel doesn't matter
If you're hardcore and want to use the windows API (assuming you're on windows)
otherwise you could simply redirect output from STDIO like this article suggests
It depends how you want to talk to the printer. Nowadays a lot of printers can support many different network protocols to receive jobs. So which is it:
IPP (Port 631)?
LPR/LPD (Port 515)?
AppSocket (Port 9100 and others) ?
FTP? RCP? SCP?
Anyway, for most of these cases you can find example code here: http://svn.easysw.com/public/cups/trunk/backend/ -- Further help here: http://www.cups.org/documentation.php/api-filter.html
(However, I wonder why you want to implement such a thing yourself on Linux...)