UsbQueryNumberDevices

Description
Obtains the total number of currently attached USB devices.

Syntax
ulrc = UsbQueryNumberDevices(pulNumDev)

Parameters

 * pulNumDev : the address of the variable to receive the Total Number.

Return Code
0x0000 - NO_ERROR

Errors
0x0057 - ERROR_INVALID_PARAMETER 0x1B58 - USB_NOT_INIT 0xFF13 - ERROR_I24_INVALID_PARAMETER 0xFF1F - ERROR_GEN_FAILURE 0xFF57 - ERROR_INVALID_PARAMETER

Example Code
//Code Snippet - UsbQueryNumberDevices { APIRET ulrc; PULONG pulNumDev; ULONG ulNumDev;

pulNumDev = &ulNumDev; ulrc = UsbQueryNumberDevices(pulNumDev); printf("\nUsbQueryNumberDevices - ulrc: 0x%04X (%hu)",ulrc,ulrc); if (!ulrc) //success {   printf(" - NumberDevices: %hu",ulNumDev); } }

Related Functions

 * UsbQueryDeviceReport
 * UsbQueryDeviceInfo
 * UsbOpen