libusb不枚举设备

Question

使用libusb 1.2.6我试图枚举Windows 7 x64上的所有设备。

MinGW是我的IDE，项目链接到gcc/libusb.a。不确定这个是否可以在x64上完成工作。

这是代码，取自示例：

usb_init(); /* initialize the library */
usb_find_busses(); /* find all busses */
usb_find_devices(); /* find all connected devices */

struct usb_bus *busses = usb_get_busses();

for (bus = busses; bus; bus = bus->next) {
        struct usb_device *dev;

        for (dev = bus->devices; dev; dev = dev->next) {
            /* Check if this device is a printer */
            if (dev->descriptor.bDeviceClass == 7) {
                /* Open the device, claim the interface and do your processing */

            }

            /* Loop through all of the configurations */
            for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
                /* Loop through all of the interfaces */
                for (i = 0; i < dev->config[c].bNumInterfaces; i++) {
                    /* Loop through all of the alternate settings */
                    for (a = 0; a < dev->config[c].interface[i].num_altsetting; a++) {
                        /* Check if this interface is a printer */
                        if (dev->config[c].interface[i].altsetting[a].bInterfaceClass == 7) {
                            /* Open the device, set the alternate setting, claim the interface and do your processing */

                        }
                    }
                }
            }
        }
    }

它可以找到1个总线，但是没有设备。我期待看到所有连接的设备。

最终我想要的是在已经有驱动程序的特定设备上建立批量传输。