3

我可以知道我有多少个 USB HID 设备 (7)，但每次我尝试获取任何设备的详细信息时，为其返回的路径始终是“\”，因此我根本无法访问该设备. 我正在使用与此代码的过程非常相似的代码：

HANDLE connectDeviceNumber(DWORD deviceIndex)
{
    GUID hidGUID;
    HDEVINFO hardwareDeviceInfoSet;
    SP_DEVICE_INTERFACE_DATA deviceInterfaceData;
    PSP_INTERFACE_DEVICE_DETAIL_DATA deviceDetail;
    ULONG requiredSize;
    HANDLE deviceHandle = INVALID_HANDLE_VALUE;
    DWORD result;

    //Get the HID GUID value - used as mask to get list of devices
    HidD_GetHidGuid (&hidGUID);

    //Get a list of devices matching the criteria (hid interface, present)
    hardwareDeviceInfoSet = SetupDiGetClassDevs (&hidGUID,
                                                 NULL, // Define no enumerator (global)
                                                 NULL, // Define no
                                                 (DIGCF_PRESENT | // Only Devices present
                                                 DIGCF_DEVICEINTERFACE)); // Function class devices.

    deviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);

    //Go through the list and get the interface data
    result = SetupDiEnumDeviceInterfaces (hardwareDeviceInfoSet,
                                          NULL, //infoData,
                                          &hidGUID, //interfaceClassGuid,
                                          deviceIndex, 
                                          &deviceInterfaceData);

    /* Failed to get a device - possibly the index is larger than the number of devices */
    if (result == FALSE)
    {
        SetupDiDestroyDeviceInfoList (hardwareDeviceInfoSet);
        Log("hidin: -- failed to get specified device number");
        return INVALID_HANDLE_VALUE;
    }

    //Get the details with null values to get the required size of the buffer
    SetupDiGetDeviceInterfaceDetail (hardwareDeviceInfoSet,
                                     &deviceInterfaceData,
                                     NULL, //interfaceDetail,
                                     0, //interfaceDetailSize,
                                     &requiredSize,
                                     0); //infoData))

    //Allocate the buffer
    deviceDetail = (PSP_INTERFACE_DEVICE_DETAIL_DATA)malloc(requiredSize);
    deviceDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);

    //Fill the buffer with the device details
    if (!SetupDiGetDeviceInterfaceDetail (hardwareDeviceInfoSet,
                                          &deviceInterfaceData,
                                          deviceDetail,
                                          requiredSize,
                                          &requiredSize,
                                          NULL)) 
    {
        SetupDiDestroyDeviceInfoList (hardwareDeviceInfoSet);
        free (deviceDetail);
        Log("hidin: -- failed to get device info");
        return INVALID_HANDLE_VALUE;
    }

    Log("Opening device with path: %s", deviceDetail->DevicePath);
4

2 回答 2

5

您确定使用定义的 UNICODE 进行编译吗？那么你的 Log() 格式化字符串是错误的。使固定：

   Log("Opening device with path: %ls", deviceDetail->DevicePath);
于 2009-11-16T22:59:02.330 回答
1

SetupDiEnumDeviceInterfaces说明您应该首先使用 deviceIndex==0; 调用它的文档 你不应该跳过值。

于 2009-11-17T09:27:57.520 回答