我使用libusb的数据传输程序usb_bulk_write和usb_bulk_read函数使用实例

//gliethttp_20080403 libusb实际测试代码

//0x02为bulk类型的OUT端点

//0x81为bulk类型的IN端点


usb_dev_handle *tavor_udev;
BOOL OpenUsbPort (long int DelayTime)
{
    struct usb_bus *bus;
    struct usb_device *dev;

    usb_init();
    usb_find_busses();
    usb_find_devices();

    tavor_udev = NULL;
    for(bus = usb_busses;bus; bus = bus->next)
    {
        for (dev = bus->devices;dev; dev = dev->next)
        {
            if( (dev->descriptor.idVendor == 0x8086) && (dev->descriptor.idProduct == 0xd001) )
            {
                tavor_udev = usb_open(dev);
                return tavor_udev;
            }
        }
    }
    fprintf(stderr,"tavor usb could not be found\n");
    return tavor_udev;
}

BOOL WriteUsb (WTPCOMMAND WtpCmd,DWORD dwCmdSize)
{
    int write_bytes;
    write_bytes = usb_bulk_write(tavor_udev,0x02,(char*)&WtpCmd,dwCmdSize,200);
    return write_bytes;
}

BOOL ReadUsb(WTPSTATUS *WtpStatus, DWORD dwSize, PDWORD pBytesRead)
{
    int read_bytes;
    read_bytes = usb_bulk_read(tavor_udev,0x81,(char*)WtpStatus,dwSize,0);
    if(pBytesRead)*pBytesRead = read_bytes;
    return read_bytes;
}

BOOL ReadUsbCharBuffer (char *WtpMessage,DWORD dwSize,PDWORD pBytesRead)
{
    int result;

    if (tavor_udev == NULL)
    {
        printf (" Error: OpenUsbPort must be called prior to calling ReadUsb!");
        return FALSE;
    }
    result = usb_bulk_read(tavor_udev,0x81,(char*)WtpMessage,dwSize,100);
    if (result < 0 )
    {
        printf (" Error: ReadFile failed with error\n");
        return FALSE;
    }
    
    *pBytesRead = result;
    if (*pBytesRead != dwSize) return FALSE;
    
    return TRUE;
}
void CloseUsbPort ()
{
    if(tavor_udev)usb_close(tavor_udev);
}

使用libusb进行一些操作必须使用sudo超级用户才有权限,所以必须首先sudo su
比如：
usb_get_string_simple(udev, dev->descriptor.iManufacturer, string, sizeof(string));
usb_get_string_simple(udev, dev->descriptor.iProduct, string, sizeof(string));
int usb_bulk_write(usb_dev_handle *dev, int ep, char *bytes, int size,int timeout);
int usb_bulk_read(usb_dev_handle *dev, int ep, char *bytes, int size,int timeout);
int usb_interrupt_write(usb_dev_handle *dev, int ep, char *bytes, int size,int timeout);
int usb_interrupt_read(usb_dev_handle *dev, int ep, char *bytes, int size,int timeout);
等都需要sudo超级用户下才能正常,所以需要sudo su来执行我们的ntwptp.exe程序