With NI-VISA to detect USB insertion/withdrawal

Is it possible to use NI-VISA to detect when a USB device is inserted or removed?

I am currently using Windows API in my application of LabWindows to capture the WM_DEVICECHANGE event.  When this event is called, I check to see if USB devices are always connected to my PC using the viFindRsrc function.  On Windows XP 32-bit, this approach has worked successfully.  This no longer works on my Windows 7 64-bit system.  After I remove the USB, the viFindRsrc function device is still indicating that the device is connected, even if it is not.

In addition, when a USB device is controlled by a driver of NI-VISA, I can't capture Windows DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE event.  I am able to see these events for other USB devices which are not controlled by a driver NI-VISA.

I solved the problem.

The behavior of the NI-VISA driver requires that you register to receive notifications from Windows. Other USB devices that are not controlled by a NI-VISA driver didn't need to register to receive DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE event.  I got the default...

Here is the code to save USB events

Here is the code where to record the events of USB:

.
.
.
DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;

intptr_t postHandle = 0;

/ * Windows HWND * /.
HWND hWnd = 0;
long long unsigned int hWndVal = 0;

/ * Get HWND of LabWindows\CVI Panel * /.
GetPanelAttribute (panelHandle, ATTR_SYSTEM_WINDOW_HANDLE, & hWndVal);

hWnd = hWndVal (HWND);

/*
* Gross peripheral USB
*
* Device Interface Class GUID = {a5dcbf10-6530-11d2-901f-00c04fb951ed}
*
*/
GUID_CLASS_USB_DEVICE. Data1 = 0xA5DCBF10L;
GUID_CLASS_USB_DEVICE. Data2 = 0 x 6530;
GUID_CLASS_USB_DEVICE. Donnees3 = 0x11D2;
GUID_CLASS_USB_DEVICE. Data4 [0] = 0 x 90;
GUID_CLASS_USB_DEVICE. Data4 [1] = 0x1F;
GUID_CLASS_USB_DEVICE. Data4 [2] = 0x00;
GUID_CLASS_USB_DEVICE. Data4 [3] = 0xC0;
GUID_CLASS_USB_DEVICE. Data4 [4] = 0x4F;
GUID_CLASS_USB_DEVICE. Data4 [5] = 0xB9;
GUID_CLASS_USB_DEVICE. Data4 [6] = 0 x 51;
GUID_CLASS_USB_DEVICE. Data4 [7] = 0xED;

NotificationFilter.dbcc_size = sizeof (DEV_BROADCAST_DEVICEINTERFACE);
NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
NotificationFilter.dbcc_classguid = GUID_CLASS_USB_DEVICE;

/*
* Set up a callback function to WM_DEVICECHANGE Windows post
* or sent to a panel of LabWindows/CVI.
*/
InstallWinMsgCallback (panelHandle, WM_DEVICECHANGE,
WindowsDeviceDetection, VAL_MODE_INTERCEPT, NULL, & postHandle);

/*
* Register the notification of device for the USB Raw Device GUID interface class
*/
RegisterDeviceNotification (hWnd, & NotificationFilter,
DEVICE_NOTIFY_WINDOW_HANDLE);

Here's the code that responds:

public static int CVICALLBACK (int panelHandle, int message WindowsDeviceDetection,
unsigned int * wParam, lParam unsigned int *, void * callbackData)
{

PDEV_BROADCAST_HDR PTDB = (PDEV_BROADCAST_HDR) lParam;

switch (message)
{
/ * Windows WM_DEVICECHANGE message * /.
case WM_DEVICECHANGE:
{
switch (* wParam)
{
/*
* Windows device change event received 'DBT_DEVNODES_CHANGED '.
*
* Device has been added or removed from the system.
*/
case DBT_DEVNODES_CHANGED:

printf ("[%s] DBT_DEVNODES_CHANGED\n", TimeStr ());

break;

/*
* Windows device change event received "DBT_DEVICEARRIVAL.
*
*
*/
DBT_DEVICEARRIVAL case:

printf ("[%s] DBT_DEVICEARRIVAL\n", TimeStr ());

break;

/*
* Windows device change event received "DBT_DEVICEREMOVECOMPLETE.
*
*
*/
DBT_DEVICEREMOVECOMPLETE case:

printf ("[%s] DBT_DEVICEREMOVECOMPLETE\n", TimeStr ());

break;

by default:
break;
}

}
}

return 0;
}

Tags: NI Software

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