如何使用libusb-1.0接收HID報告？

我有一個USB HID刻度，我需要從中獲取稱量報告。我可以在Linux上通過從/dev/hidraw#一次讀取7個字節來完成此操作，但我希望使用libusb-1.0獲得相同的信息。如何使用libusb-1.0接收HID報告？

即使當我得到一些非空字節，我得到錯誤-9：LIBUSB_ERROR_PIPE

我試圖用一個控制轉移，像這樣：

#define WEIGH_REPORT_SIZE 7 

    /* 
    * Open a handle to the found scale 
    */ 
    libusb_open(dev, &handle); 
#ifdef __linux__ 
    libusb_detach_kernel_driver(handle, 0); 
#endif 
    libusb_claim_interface(handle, 0); 

    /* 
    * Try to transfer data about status 
    * 
    */ 
    unsigned char data[WEIGH_REPORT_SIZE]; 
    unsigned int len = libusb_control_transfer(
     handle, 
     LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_CLASS | 
      LIBUSB_RECIPIENT_INTERFACE, 
     HID_REPORT_GET, 
     //wValue => hid report, no report ID 
     0x0100, 
     0x00, //windex => interface 0 
     data, 
     WEIGH_REPORT_SIZE, //wLength 
     10000 //timeout => 10 sec 
     ); 
    int i; 
    printf("Got %d bytes from control transfer:\n", len); 
    for(i = 0; i < WEIGH_REPORT_SIZE; i++) { 
     printf("%x\n", data[i]); 
    }

來源

2011-01-30 erjiang