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Contents
Programming For USB Device
Overview
Programmers Guide
Scenario
Data transfer
Synchronous Transfer
Asynchronous Transfer
Reading Descriptors
USB Support Routines And Structures
Common Procedures
UsbEnumerateDevices
OpenRapidUsb
IsRapidUsbOpened
CloseRapidUsb
Descriptors
UsbGetDescriptor
UsbGetDeviceDescriptor
UsbGetStringDescriptor
UsbGetConfigDescriptor
UsbFreeConfigDescriptor
UsbGetInterfaceDescriptor
UsbFreeInterfaceDescriptor
UsbGetEndpointDescriptor
Configure Device
UsbGetDeviceInfo
UsbUnconfigureDevice
UsbSelectConfig
UsbGetConfig
UsbSelectInterface
UsbGetInterface
UsbResetDevice
UsbGetBandwidthInfo
UsbCyclePort
Features and Status
UsbSetFeature
UsbClearFeature
UsbGetStatus
Vendor/Class Requests
UsbVendorRequestIn
UsbVendorRequestOut
UsbClassRequestIn
UsbClassRequestOut
Pipes
IsRapidUsbPipeOpened
UsbPipeOpen
UsbPipeClose
UsbGetPipeCount
UsbPipeGetInfo
UsbPipeDirectionIn
UsbPipeGetType
UsbTransfer
UsbTransferAsync
TRANSFER_COMPLETION_ROUTINE
UsbCancelTransfer
UsbPipeReset
UsbPipeAbort
Other
UsbGetPortStatus
UsbGetCurrentFrameNumber
USB Structures and Types
RDUSB_DEVICE_INFORMATION
RDUSB_PIPE_INFORMATION
RDUSB_PIPE_TYPE
RDUSB_BANDWIDTH_INFORMATION
UsbGetDeviceDescriptor
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Language

Description

C/C++
BOOL UsbGetDeviceDescriptor(IN  USB_DEVICE_HANDLE hUsb, 
OUT PUSB_DEVICE_DESCRIPTOR pDevDescr);  

Delphi
function UsbGetDeviceDescriptor(hUsb         : USB_DEVICE_HANDLE;
                                var DevDescr : USB_DEVICE_DESCRIPTOR) : BOOL; stdcall;

VB
Function UsbGetDeviceDescriptor  (ByVal hUsb As Long, _
                                  ByRef DevDescr As USB_DEVICE_DESCRIPTOR) As Boolean



Parameters
 
hUsb  
Specifies handle to USB device.  
 
pDevDescr  
Pointer to device descriptor.  

Return Value
 
If function fails it return FALSE. To detect error call GetLastError function.  

Description
 
Use this function to retrieve device descriptor. This function can be used only after getting valid handle from OpenRapidUsb function.  

Example
 
   if (UsbEnumerateDevices())
   {
      // open first RapidUSB device

      USB_HANDLE hUsb = OpenRapidUsb(0
);

      USB_DEVICE_DESCRIPTOR DeviceDescriptor;
   
      if (UsbGetDeviceDescriptor(hUsb, &DeviceDescriptor))
         // Descriptor retrieved successfully

      else
         // Error! Check if hUsb is valid

      CloseRapidUsb(hUsb);
   }