WinUSB与设备通讯的代码流程

int _tmain(int argc, _TCHAR* argv[])
{

    GUID guidDeviceInterface = OSR_DEVICE_INTERFACE; //in the INF file

    BOOL bResult = TRUE;

    PIPE_ID PipeID;

    HANDLE hDeviceHandle = INVALID_HANDLE_VALUE;
    WINUSB_INTERFACE_HANDLE hWinUSBHandle = INVALID_HANDLE_VALUE;

    UCHAR DeviceSpeed;
    ULONG cbSize = 0;

    bResult = GetDeviceHandle(guidDeviceInterface, &hDeviceHandle);
    if(!bResult)
    {
        goto done;
    }

    bResult = GetWinUSBHandle(hDeviceHandle, &hWinUSBHandle);
    if(!bResult)
    {
        goto done;
    }

    bResult = GetUSBDeviceSpeed(hWinUSBHandle, &DeviceSpeed);
    if(!bResult)
    {
        goto done;
    }

    bResult = QueryDeviceEndpoints(hWinUSBHandle, &PipeID);
    if(!bResult)
    {
        goto done;
    }

    bResult = SendDatatoDefaultEndpoint(hWinUSBHandle);
    if(!bResult)
    {
        goto done;
    }

    bResult = WriteToBulkEndpoint(hWinUSBHandle, &PipeID.PipeOutId, &cbSize);
    if(!bResult)
    {
        goto done;
    }

    bResult = ReadFromBulkEndpoint(hWinUSBHandle, &PipeID.PipeInId, cbSize);
    if(!bResult)
    {
        goto done;
    }


    system("PAUSE");

done:
    CloseHandle(hDeviceHandle);
    WinUsb_Free(hWinUSBHandle);

    return 0;
}