Is it possible to make a program auto run (execute) when the USB it is stored on is plugged into a computer
I don't think this is possible due to the searching I have looked at on the Internet and also the security risk such coding would have
E.g. I have a simple countdown timer (10 to 1) programmed in C++ (complied on windows), when the USB (which the .exe file is stored on) is plugged into a computer the timer will start without me executing it manually.
You can create an Autorun.inf file and place it on the USB drive. Windows will read this file when the drive is connected. In the file you can specify the name of the program you'd like to run, as well as icons, etc.
You cannot force the program to run when the USB drive is inserted. That's up to the security policy of the operating system, and most will at least prompt the user "Do you want to run 'Setup.exe' from this drive?" or something like that.
By default it's not possible, since Windows puts users in control of their computers as much as possible—if they don't want autorun enabled, it will not be possible to have a program executed automatically.
You could write a helper program that runs in the background (possibly as a service) that sleeps most of the time, waiting for a USB device to be plugged in. There might be a way to receive notifications of this, or you might just have to poll it periodically, I don't know. Once it detects a USB device, it can then of course do whatever it wants (CreateProcess etc.).
Since Windows 7, the autorun.inf file is ignored when it comes to USB devices. U3 technology allows a thumb drive to be treated as a CD/DVD which might be a possible solution.
I think you can do so using system(), if you are familiar with disktype command in cmd, then I think you can figure things out. All what you can do in command prompt you can also do in c++ using system(). But it will consume alot of memory space
Related
I'm building a C++/MFC desktop app that shares a lot of data with an USB device.
Because of how this devices works I need to close and open the virtual COM I use, severl times per minute.
Everything works well, but I would like to stop the annoying Windows USB connected/disconnected suound, that comes up every time I connect or disconnect the device.
So my question is: is there a way to disable/enable Windows event sounds (or a single event sound, even better) through my C++ code?
Obviously I could somehow turn down the volume, but that's not what I want, since it would stop sounds from every other app.
Is there a way to do something like this?
Thanks!
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 am finding a Ubuntu OS command, which lets the program to read the data from keyboard even if the program is in background. I tried to search it a lot but got no success. If any Ubuntu/Linux programmer knows the OS command which lets the program to do so, Please share it with me.
I am a beginner of Ubuntu programming.
You can use the Linux input subsystem to read events from mice and keyboards. It will only work if your application has the necessary privileges. Basically, you have to run the application as root for this to work.
If you cannot run as root, you should not be attempting to monitor the keyboard anyway.
You can create an X11 application to monitor keyboard events in the current session. It only works for the current user, and in the current graphical environment, and may not be able to observe privileged dialogs, for example password inputs. For details, look at the application shortcut launcher for your desktop environment; all Linux DEs I've ever heard of have one.
I think the old Linux Journal articles, The Linux USB Input Subsystem and Using the Input Subsystem, are still one of the best introductions to the Linux input subsystem. Most Linux distributions nowadays also support uinput, a similar device that allows injecting input events back to the kernel subsystem, designed to allow user-space input device drivers. Their interfaces are described in /usr/include/linux/input.h and /usr/include/linux/uinput.h. I recommend you start at the above articles, and then look at some input and uinput examples.
If you are comfortable using a program, have a look at Logkeys project
. It directly takes input from /dev/input/event*.
I want to monitor all file changes in windows using BIOS interrupts in c++ but don't know how to do that.Can someone help me with that?
I tried Windows API but that's not able to monitor all file changes in windows.It just monitors file changes in a special directory.
In Windows it is not really practical to monitor hard drive changes in interrupt level because the Windows core takes care of it and it is not open.
You can alternatively monitor all processes and their changes to the hard drive. Take a look at: http://yaprocmon.sourceforge.net/ Its open source so you can try to learn from it.
Windows sends notification about file changes using native API. And it does not necessarily use the BIOS.
Give a look to http://msdn.microsoft.com/en-us/library/windows/desktop/aa365261(v=vs.85).aspx
i need to find away to turn on the pc from c++ application ,
is there any way to do this?
Thanks
If the computer is off, it can't be executing code, and therefore can't turn itself on programmatically.
ACPI changes that somewhat, but for us to be able to help, you have to be more specific about your exact requirements.
If you need to turn on a different computer, take a look at Wake-on-LAN.
You will not be able to write a program to turn a computer on that the program itself is installed on.
If you need to write an application that will turn on a different computer, Wake-on-LAN is the tool for you. Modern desktops have NICs that is always receiving power - even if the computer is in an S5 state. Assuming the BIOS supports it and it is enabled.
Wake-On-LAN works by sending a Magic Packet to the NIC. The details of what the payload consists of is outlined in the article.
This is possibly a duplicate of C#: How to wake up system which has been shutdown? (although that is C#).
One way to do it under windows is to create a timer with CreateWaitableTimer(), set the time with SetWaitableTimer() and then do a WaitForSingleObject(). Your code will pause, and you can put the computer into standby (maybe also hibernation, but not shutdown). When the timer is reached, the PC will resume and so will your program.
See here for a complete example in C. The example shows how to calculate the time difference for the timer, and how to do the waiting in a thread (if you are writing a graphical application).
I have to add, you can also schedule the computer to wake up using the Windows Task Scheduler ('Wake the computer to run this task'). This possibly also works when the computer is shut down. There is also an option in some computers BIOS to set a wake time.
Under Linux, you can set the computer to wake up by writing to a special file:
echo 2006-02-09 23:05:00 > /proc/acpi/alarm
Note that I haven't tested all of this, and it is highly dependent on the hardware (mainboard), but some kind of wake-up should be available on all modern PCs.
See also: http://en.wikipedia.org/wiki/Real-time_clock_alarm ,
and here is a program that claims to do it on windows: http://www.dennisbabkin.com/wosb/
Use strip. If you require a Windows computer to be turned on, the cross-tools i686-w64-mingw32-strip or x86_64-w64-mingw32-strip should be used. These command-line programs modify an executable, and the result is able to turn on a computer.
How could you turn on a computer from an application, when no processes are running on it when it's shut down ? You can turn on another computer (Wake on Lan), but not the one you are running.
It is possible.
First thing to do is configure Wake On Lan. Check out this post on Lifehacker on how to do it: http://lifehacker.com/348197/access-your-computer-anytime-and-save-energy-with-wake+on+lan.
(Or this link: http://hblg.info/2011/08/21/Wake-on-LAN-and-remote-login.html)
Then you need to send a magic packet from your C++ application. There are several web services that already do this from javascript (wakeonlan.me) , but it can be done from within a C++ application as well.
Chances are, that if you want to do this, you are working with servers.
In such case, your mainboard may should an IMPI baseboard management controller.
IPMI may be used to cycle the chassis power remotely.
Generally, the BMC will have its own IP address, to which you may connect to send control messages.