UsbQueryDeviceReport

Obtains the Compound Descriptor of a specific USB device.

Syntax

For access by Device Handle use:

ulrc = UsbQueryDeviceReport(Handle,pulBufLen,pucData)

For access by Device Number:

ulrc = UsbQueryDeviceReport(ulDevNumber,pulBufLen,pucData)

Parameters

Handle

the Device Handle received from the previous UsbOpen.

ulDevNumber

the Device Number from 1 up to the Total Number from UsbQueryNumberDevices.

pulBufLen

the address of the variable to specify/receive the number of bytes.

pucData

the address of the buffer to receive the Compound Descriptor.

Return Code

0x0000 - NO_ERROR

Errors

0x0057 - ERROR_INVALID_PARAMETER
0x1B58 - USB_NOT_INIT
0xFF13 - ERROR_I24_INVALID_PARAMETER
0xFF1F - ERROR_GEN_FAILURE
0xFF37 - ERROR_DEV_NOT_EXIST
0xFF57 - ERROR_INVALID_PARAMETER
0xFF6F - ERROR_BUFFER_OVERFLOW
0xFFEA - ERROR_MORE_DATA

Remarks

The Compound Descriptor is the concatenation of Device Descriptor and Configuration Descriptor.

Example Code

//Code Snippet - UsbQueryDeviceReport
{
  APIRET ulrc;
  PUCHAR pucReport;
  PULONG pulBufLen;
  UCHAR ucReport[4096];
  ULONG ulBufLen = sizeof(ucReport);
  ULONG ulDevNumber = ulNumDev;

  pucReport = &ucReport[0];
  pulBufLen = &ulBufLen;
  ulrc = UsbQueryDeviceReport(ulDevNumber,pulBufLen,pucReport);
  printf("\nUsbQueryDeviceReport - ulrc: 0x%04X (%hu)",ulrc,ulrc);
  if (!ulrc) //success
  {
    int i; printf(" - DeviceReport:\n");
    for (i=0;i<ulBufLen;i++) printf("%02X",ucReport[i]);
  }
}

Related Functions

• UsbQueryDeviceInfo
• UsbQueryNumberDevices
• UsbOpen