windows SetupDiGetDeviceInterfaceDetail 仅返回所有 USB HID 对象路径的“\”
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SetupDiGetDeviceInterfaceDetail returns only "\" for the path of all USB HID objects
提问by xitrium
I can tell how many USB HID devices I have (7), but every time I try to get details on any device, the path returned for it is always "\", making it so that I can't access the device at all. I'm using code that is very similar in procedure to this code:
我可以知道我有多少个 USB HID 设备 (7)，但是每次我尝试获取任何设备的详细信息时，返回的路径始终为“\”，因此我根本无法访问该设备. 我使用的代码与此代码的过程非常相似：
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);
回答by Hans Passant
Surely you are compiling with UNICODE defined? Then you Log() formatting string is wrong. Fix:
你肯定是用定义的 UNICODE 编译的？那么你 Log() 格式化字符串是错误的。使固定：
Log("Opening device with path: %ls", deviceDetail->DevicePath);
回答by MSalters
The documentation for SetupDiEnumDeviceInterfacesstates that you should first call it with deviceIndex==0; you're not supposed to skip values.
文档SetupDiEnumDeviceInterfaces说明您应该首先使用 deviceIndex==0 调用它；你不应该跳过值。
