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Hello,
I'm writing an windows service application to scan for any USB device changes(ie if any USB device was inserted or removed from the system) This has to be an non UI application. I have an service that is declared as follows
MyServiceStatus.dwServiceType = SERVICE_WIN32;
MyServiceStatus.dwCurrentState = SERVICE_START_PENDING;
MyServiceStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_HARDWAREPROFILECHANGE ;
MyServiceStatus.dwWin32ExitCode = 0;
MyServiceStatus.dwServiceSpecificExitCode = 0;
MyServiceStatus.dwCheckPoint = 0;
MyServiceStatus.dwWaitHint = 0;
MyServiceStatusHandle = RegisterServiceCtrlHandlerEx("USB Trap Service", MyServiceCtrlHandler,NULL);
I'm registering for messages using the register device notification
memset(&dbdi, 0, sizeof(dbdi));
dbdi.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
dbdi.dbcc_classguid = GUID_DEVINTERFACE_USB_DEVICE;
dbdi.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
SStatusHandle = RegisterDeviceNotification((HANDLE)MyServiceStatusHandle,(LPVOID)&dbdi,DEVICE_NOTIFY_SERVICE_HANDLE);
The service control handler is as follows
DWORD WINAPI MyServiceCtrlHandler (DWORD Opcode,DWORD dwEventType,LPVOID lpEventData, PVOID lpContext)
{
DWORD status;
switch(Opcode)
{
case SERVICE_CONTROL_DEVICEEVENT:
{
switch((int) dwEventType)
{
case DBT_DEVICEARRIVAL:
break;
case DBT_DEVICEREMOVECOMPLETE:
break;
}
break;
}
}
}
The service is registered and starts and terminates correctly. I'm not receiving any of the device change message.
Any help will be apprecitated
Regards,
murali
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Im struggling to understand how I would go about developing an SNMP proxy agent for non-snmp enabled devices. Thus such devices connnect to a machine that has an IP address and does have a SNMP device. So basic question is how do I monitor non-snmp devices in a SNMP management application. I want to develop the proxy (gateway) in either java or c# but dont know where to start and cant find any examples. If there is any off the shelf components I could use please let me know.
Thanks
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In my opinion, this user guide[^] might give you some idea to do develop your application.
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Hi, I need someone help me to explain about the following TCP/IP command line:
- Nbstat
- Netstat
- Tracert
I already read the command line reference in windows help of windows xp professional but I could not understand about each command line purpose and its example. Please give me some short explaination and its example or provide me any resource which is very easy to understand about the above command line.
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- netstat (see http://en.wikipedia.org/wiki/Netstat)
- tracert (see http://en.wikipedia.org/wiki/Tracert)
- nbstat (A command line program for the problem diagnosis, which supplies protocol statistics and information to TCP/IP connections over NBT (NetBIOS of over TCP/IP). This instruction is available only if TCP/IP protocol were installed. See also Netstat. )
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Thank you very much for your hyperlink.
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When my Windows XP stays idle for 15 minutes,the system freezes with a popup saying "Generic Host Process for Win32 services...". It seems that the scheduler service is crashing (found it via debugging) when it tries to execute system tasks after 15 minutes of inactivity. If I disable the task scheduler service, the problem disappears. I would want to know if it is possible to know which system task is crashing, or if is possible to know what system tasks is trying to do (there is a place in the registry with these tasks?). I don't have anything in C:\Windows\Tasks.
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Miguel A. Vilariño wrote: It seems that the scheduler service is crashing (found it via debugging) when it tries to execute system tasks after 15 minutes of inactivity. If I disable the task scheduler service, the problem disappears. I would want to know if it is possible to know which system task is crashing, or if is possible to know what system tasks is trying to do (there is a place in the registry with these tasks?)
In my opinion, you should use event viewer[^] to check the history of your system performance.
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The event viewer doesn't help me. It shows roughly the same error as the popup (schedsvc.dll crash accessing wrong address).
I can force this error to happen executing Rundll32.exe advapi32.dll,ProcessIdleTasks
I would want to know which one of these idleTasks produces the error.
--
Miguel A. Vilariño
Software Developer
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In my opinion, you should not ignore event viewer. First try to access task manager and go to the tab Process. Then click on the column name Mem Usage in order to sort the system consume size.
But if your computer become crash and not working, ou should return back to your application log in event viewer in order to view an application state of each user.
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Hi ppl,
I connect USB drive in my PC but i get this error:
"F:\ is not accessable. The request could not performed because of an I/O device error".
Where Could be the problem.
Regards
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What is the operating system version of your computer. If you are running windows 2000 or windows xp, it will automatic detect the flash drive for you. But, if your flash drive have another built-in function, it would require addition driver to be install. When you purchase your flash drive you should have a diskette or CDROM distribute that require for driver installation to make a device to utilize full function.
Sometime, its relate to your respond so quickly to your flash drive. You just plug in your flash drive and you didn't wait around one or two minute to wait for windows install driver for that flash drive. Then you will be ablve to use this flash drive. Another solution is change the slot of your flash drive to insert another USB port on your computer.
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My OS is XP Pro. It detect sa new hardware and i see tooltip messgae that my new hardware is ready to use, when i open MyComputer window i can see me USB-Drive when i try to open i get error message.
Maybe it's demaged something in hardware 
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albCode wrote: It detect sa new hardware and i see tooltip messgae that my new hardware is ready to use, when i open MyComputer window i can see me USB-Drive when i try to open i get error message.
Maybe it's demaged something in hardware
Ok, so one more thing that I would like to know from you. Does your flash drive is a simple flash drive or its include addition function such as an MP3 flash drive or digital video flash drive...? Because some device that use many function and connection via USB port also need its own driver install on the specific computer in order to gain fully ability of this devic.
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Yes, it's supprot MP3/WMA/REC/FM
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I see, in my opinion the driver of your flash drive might include in the CD or diskett ship with this flash drive. Please verified your flash drive package that you purchase from the seller. If there is no driver on a CD or a diskette provide with your flash drive package, you should contact the seller to obtain its driver.
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Yes maybe u have right cuz i tryed to re-install drivers but same problem.
Thanks 4 ur time
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albCode wrote: i tryed to re-install drivers but same problem.
Is this a driver which provide by windows or provide by the company seller?
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It' driver which provide Windows.
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Ok, so you should check for the disk of driver which might be ship in diskette or CDROM. If you could not found it, you can check it at the place that you purchase this flash drive.
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Yes, I should find drivers but UNFORTUNATELY i can't find CD-Driver for my flash so i have to search in internet bcs i have much free time.
Thanks 4 ur time.
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albCode wrote: Yes, I should find drivers but UNFORTUNATELY i can't find CD-Driver for my flash so i have to search in internet bcs i have much free time
Good luck, I wish you found its soon.
albCode wrote: Thanks 4 ur time
You are welcome, I'm very glad to support you and the other people ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif) 
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Best regards
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Some MP3 players recommend that you remove the batteries before attaching it to the computer.
Michael Martin
Australia
"I controlled my laughter and simple said "No,I am very busy,so I can't write any code for you". The moment they heard this all the smiling face turned into a sad looking face and one of them farted. So I had to leave the place as soon as possible."
- Mr.Prakash 24/04/2004
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Thanks 4 ur time.
I should contact my seller about this problem and change USB-Dirve or do something else.
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