UsbQueryDeviceInfo
Description
Obtains attachment information about a specific USB device.
Syntax
For access by Device Handle use:
ulrc = UsbQueryDeviceInfo(Handle,pulBufLen,pucData)
For access by Device Number use:
ulrc=UsbQueryDeviceInfo(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 containing the buffer length. Must be set to 12.
- pucData
- the address of the buffer to receive the Attachment Information.
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
Remarks
The Attachment Information consists of the following:
- UCHAR ctrlID - controller identifier.
- UCHAR deviceAddres - USB device address.
- UCHAR bConfigurationValue - current USB device Configuration Value.
- UCHAR bInterfaceNumber - current index in interface array for this item.
- UCHAR lowSpeedDevice - 0 is full speed, 2 is high speed, else low speed.
- UCHAR portNum - port number to which the USB device is attached.
- USHORT parentHubIndex - index in hub table to parent hub.
- HDEVICE rmDevHandle - Resource Manager device handle.
Example Code
//Code Snippet - UsbQueryDeviceInfo
{
APIRET ulrc;
PUCHAR pucInfo;
PULONG pulBufLen;
UCHAR ucInfo[12];
ULONG ulBufLen = sizeof(ucInfo);
ULONG ulDevNumber = ulNumDev;
pucInfo = &ucInfo[0];
pulBufLen = &ulBufLen;
ulrc = UsbQueryDeviceInfo(ulDevNumber,pulBufLen,pucInfo);
printf("\nUsbQueryDeviceInfo - ulrc: 0x%04X (%hu)",ulrc,ulrc);
if (!ulrc) //success
{
int i; printf(" - DeviceInfo:\n");
for (i=0;i<ulBufLen;i++) printf("%02X",ucInfo[i]);
}
}