I'm trying to write an application that will take specific action when it detects an overcurrent condition on any USB port.
However, my googlefu is not able to come up with anything useful (though I can now tell you 101 ways to fix a USB overcurrent problem).
Is there are standard windows API to retrieve USB status info?
If not is there another/better way to detect USB overcurrent conditions programatically?
As far as I can see here http://msdn.microsoft.com/en-us/library/ff539687 you need to turn to the WDK (Window Driver Kit).
Related
How can i programmatically eject USB Device even if it is in use?
Scenarios:
USB device attached to the system.
We get WM_DEVICECHANGE message by "RegisterDeviceNotification" through which we can handle events like DBT_DEVICEARRIVAL, DBT_DEVICEQUERYREMOVE etc.
Now if the device is in use, if we want to eject it from explorer, it prompts as "Problem Ejecting USB Mass Storage Device "This device is currently in use. Close any programs or windows that might be using the device, and then try again."
Question: 1: How can we eject USB without any prompt while it is in use?
Question: 2: How can we get notification when the user press eject from explorer for USB device ?
Thanks in advance :)
Well, you can't mechanically eject it. So what does it mean to software-eject it? It means that Windows will prevent any further handles to be created for files or directories. As a result, it's safe to remove the USB stick afterwards
Now what does it mean that the USB stick is in use? That just means there are open handles. It doesn't make a difference whether you prevent any further handles from being created. Removing a USB stick while there's a handle open means that you risk corrupting the content on the USB stick.
Therefore, it's not a matter of wanting to ejecting the USB stick while in use. The question simply makes no sense at all.
Note that Windows already tells you what you should in fact do: Close any programs or windows that might be using the device, and then try again.
Question two similarly does not make a lot of sense either. When disk F: is gone, why should you care about the details? After all, if you had reasons to care (e.g. open file), Windows would have blocked that operation.
I need to simulate plug/unplug for USB device in C++ under Windows environment. I know the existence of this IOCTL
http://msdn.microsoft.com/en-us/library/windows/hardware/ff537243(v=vs.85).aspx
(IOCTL_INTERNAL_USB_CYCLE_PORT) which indeed is what I am looking for, but I don't know how to use.
Is there anyone which can tell me who I can find an example or share some lines of code in order to help me, please!
Thanks in advance.
Since you are in User Mode land and using C++ I'd recommend looking at the devcon sample. Out of the box you can use it on the command line to issue PnP or disable/enable requests to devices. The source code is also available, so you can use that as a start to get this functionality added to your environment.
I'm looking to write an application that will allow me to control music, etc with a remote control. The infrared receiver I have is built into my MacBook Pro which is running Windows.
What I want to know is how can I go about this? Most of the information I can find online is specific to writing Windows device drivers and I'm having trouble finding out how to use drivers that already exist for a device.
Is it absolutely necessary for me to write my own drivers or is there a way to use the drivers provided by Apple?
On Windows you communicate with a driver by first opening it using CreateFile and subsequently sending commands to it using DeviceIoControl. You need documentation for the driver's API though to understand what functionality is available through which control codes and what parameters they expect. Digging up that information is probably the hard part.
I would be using a USB hub to connect multiple devices. I want to fix a specific USB device to a particular slot. Then check if it is done properly.
The way I am planning to achieve this is to get the complete USB path like
PCIROOT(0)#PCI(1D00)#USBROOT(0)#USB(1)#USB(2)#USB(3)#USB(3)
I can get this particular string in w7 via device property but the same is not available in wXP.
You can build this path by using the SetupAPI.
The device manager is built with this.
You start with CM_Locate_DevNode and enumerate children with CM_Get_Child.
I strongly advise you against what you're planning to do. AFAIK a USB device MUST function regardless on the USB port it's plugged in. If you'll creating such a device, forget e.g. about the "Certified for Windows" logo.
Just handle WM_DEVICECHANGE message, then use e.g. WMI to search for the USB device you're interested in. Here's my article about it: that time I coded C# language, however WMI has C++ API as well.
I'm looking to be able to display status information using a small LED or a small LCD screen connected through USB.
All I need to display is very simple status (standby, error, running).
Is there anything already made, decent looking and programmable through C++?
Are you looking for something like this ? Since it's USB HID class, it should be fairly trivial to control from C++ on both Windows and Linux. (And I assume Mac OSX wouldn't be that hard either)
The Logitech G15 has one.