UsbRegisterChangeNotification: Difference between revisions
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phDeviceAdded = &hDeviceAdded; | phDeviceAdded = &hDeviceAdded; | ||
ulrc = DosCreateEventSem(NULL,phDeviceAdded,DC_SEM_SHARED,FALSE); | ulrc = DosCreateEventSem(NULL,phDeviceAdded,DC_SEM_SHARED,FALSE); | ||
printf("\nDosCreateEventSem - ulrc: | printf("\nDosCreateEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc); | ||
phDeviceRemoved = &hDeviceRemoved; | phDeviceRemoved = &hDeviceRemoved; | ||
ulrc = DosCreateEventSem(NULL,phDeviceRemoved,DC_SEM_SHARED,FALSE); | ulrc = DosCreateEventSem(NULL,phDeviceRemoved,DC_SEM_SHARED,FALSE); | ||
printf("\nDosCreateEventSem - ulrc: | printf("\nDosCreateEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc); | ||
pNotifyID = &NotifyID; | pNotifyID = &NotifyID; | ||
ulrc = UsbRegisterChangeNotification(pNotifyID,hDeviceAdded,hDeviceRemoved); | ulrc = UsbRegisterChangeNotification(pNotifyID,hDeviceAdded,hDeviceRemoved); | ||
printf("\nUsbRegisterChangeNotification - ulrc: | printf("\nUsbRegisterChangeNotification - ulrc: 0x%04X (%hu)",ulrc,ulrc); | ||
//await attach device event | //await attach device event | ||
ulrc = DosWaitEventSem(hDeviceAdded,ulTimeout); | ulrc = DosWaitEventSem(hDeviceAdded,ulTimeout); | ||
printf("\nDosWaitEventSem - ulrc: | printf("\nDosWaitEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc); | ||
if (!ulrc) //success | if (!ulrc) //success | ||
{ | { | ||
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//await detach device event | //await detach device event | ||
ulrc = DosWaitEventSem(hDeviceRemoved,ulTimeout); | ulrc = DosWaitEventSem(hDeviceRemoved,ulTimeout); | ||
printf("\nDosWaitEventSem - ulrc: | printf("\nDosWaitEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc); | ||
if (!ulrc) //success | if (!ulrc) //success | ||
{ | { | ||
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==Related Functions== | ==Related Functions== | ||
* [[UsbRegisterDeviceNotification]] | |||
* [[UsbDeregisterNotification]] | |||
* [[UsbOpen]] | |||
[[Category:USBCalls]] | [[Category:USBCalls]] | ||
Latest revision as of 17:24, 12 February 2017
Description
Registers semaphores for generic attach/detach notification of USB devices.
Syntax
ulrc = UsbRegisterChangeNotification(pNotifyID,hDeviceAdded,hDeviceRemoved)
Parameters
- pNotifyID
- the address of the variable to receive the Notification Identifier.
- hDeviceAdded
- the handle of the event semaphore to be posted on device attach.
- hDeviceRemoved
- the handle of the event semaphore to be posted on device detach.
Return Code
0x0000 - NO_ERROR
Errors
0x0006 - ERROR_INVALID_HANDLE 0x0057 - ERROR_INVALID_PARAMETER 0x005F - ERROR_INTERRUPT 0x0067 - ERROR_TOO_MANY_SEM_REQUESTS 0x0069 - ERROR_SEM_OWNER_DIED 0x1B58 - USB_NOT_INIT 0x1B59 - USB_ERROR_NO_MORE_NOTIFICATTIONS 0xFF06 - ERROR_INVALID_HANDLE 0xFF1F - ERROR_GEN_FAILURE 0xFF57 - ERROR_INVALID_PARAMETER 0xFF64 - ERROR_TOO_MANY_SEMAPHORES
Remarks
Example Code
//Code Snippet - UsbRegisterChangeNotification
{
APIRET ulrc;
HEV hDeviceAdded;
HEV hDeviceRemoved;
PHEV phDeviceAdded;
PHEV phDeviceRemoved;
PUSBNOTIFY pNotifyID;
ULONG ulTimeout = 8000;
USBNOTIFY NotifyID;
//acquire semaphores
phDeviceAdded = &hDeviceAdded;
ulrc = DosCreateEventSem(NULL,phDeviceAdded,DC_SEM_SHARED,FALSE);
printf("\nDosCreateEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc);
phDeviceRemoved = &hDeviceRemoved;
ulrc = DosCreateEventSem(NULL,phDeviceRemoved,DC_SEM_SHARED,FALSE);
printf("\nDosCreateEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc);
pNotifyID = &NotifyID;
ulrc = UsbRegisterChangeNotification(pNotifyID,hDeviceAdded,hDeviceRemoved);
printf("\nUsbRegisterChangeNotification - ulrc: 0x%04X (%hu)",ulrc,ulrc);
//await attach device event
ulrc = DosWaitEventSem(hDeviceAdded,ulTimeout);
printf("\nDosWaitEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc);
if (!ulrc) //success
{
printf(" - obtained Attach Notification");
}
//await detach device event
ulrc = DosWaitEventSem(hDeviceRemoved,ulTimeout);
printf("\nDosWaitEventSem - ulrc: 0x%04X (%hu)",ulrc,ulrc);
if (!ulrc) //success
{
printf(" - obtained Detach Notification");
}
}