相同HID設備的句柄獲取

最近項目上需要做一個小上位機，獲取相同HID設備的信息，並逐個進行系統設置。

經過1天的調試，已經完成了。前期在相同HID設備句柄獲取方面，受到了一點小小的阻力，網上也沒有獲取到相關的信息，可能有遇到同樣問題的朋友，把我的解決方式貼出來，或許會有點作用吧。

基於VS2015，使用MFC自帶USB類庫。核心代碼如下，思路其實很簡單：通常我們使用PID和VID來獲得不同設備的句柄，相同PID和VID的設備，就需要其他的特徵來獲取句柄，調試過程中發現，相同HID的設備，設備路徑是不同的，可以用設備路徑作爲區分，來獲得句柄即可。

HANDLE OpenSamePIDDevice(int overlapped, unsigned short Pid_Value)
{
	int Pid_count = 0;
	LPCWSTR device_path = NULL;


	HANDLE hidHandle = NULL;
	HidD_GetHidGuid(&hidGuid); //取得類別 
	HDEVINFO hDevInfo = SetupDiGetClassDevs(&hidGuid, NULL, NULL,
		(DIGCF_PRESENT | DIGCF_DEVICEINTERFACE));  //獲取設備信息羣

	if (hDevInfo == INVALID_HANDLE_VALUE)//未獲得設備信息羣則直接退出
		return INVALID_HANDLE_VALUE;

	SP_DEVICE_INTERFACE_DATA devInfoData;
	devInfoData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
	int deviceNo = 0;
	SetLastError(NO_ERROR);

	while (GetLastError() != ERROR_NO_MORE_ITEMS)
	{
		if (SetupDiEnumInterfaceDevice(hDevInfo, 0, &hidGuid, deviceNo, &devInfoData)) //枚舉成功？
		{
			ULONG requiredLength = 0;
			SetupDiGetInterfaceDeviceDetail(hDevInfo, &devInfoData, NULL, 0, &requiredLength, NULL);//獲得接口詳細信息
			PSP_INTERFACE_DEVICE_DETAIL_DATA devDetail = (SP_INTERFACE_DEVICE_DETAIL_DATA*)malloc(requiredLength);
			devDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
			if (!SetupDiGetInterfaceDeviceDetail(hDevInfo, &devInfoData, devDetail, requiredLength, NULL, NULL))//獲得詳細信息失敗則退出
			{
				free(devDetail);
				SetupDiDestroyDeviceInfoList(hDevInfo);
				return INVALID_HANDLE_VALUE;
			}

			if (overlapped) //打開設備
			{
				hidHandle = CreateFile(devDetail->DevicePath,
					GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
					NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
			}
			else
			{
				hidHandle = CreateFile(devDetail->DevicePath,
					GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
					NULL, OPEN_EXISTING, 0, NULL);
			}
			//if (devDetail != NULL)
			//free(devDetail);
			if (hidHandle == INVALID_HANDLE_VALUE)
			{
				SetupDiDestroyDeviceInfoList(hDevInfo);
				//	free(devDetail);
				return INVALID_HANDLE_VALUE;
			}
			_HIDD_ATTRIBUTES hidAttributes;
			if (!HidD_GetAttributes(hidHandle, &hidAttributes))
			{
				CloseHandle(hidHandle);
				SetupDiDestroyDeviceInfoList(hDevInfo);
				return INVALID_HANDLE_VALUE;
			}

			if ((USB_VID == hidAttributes.VendorID)&(Pid_Value == hidAttributes.ProductID))   //僅僅根據VID進行STM32設備判斷
			{
				++Pid_count;

				if (Pid_count == 1)
				{ 			
					//獲得句柄
					if(Pid_Value == Falcon_Handset_PID)
					{ 
					hHandSet1 = hidHandle;
					}
					else if(Pid_Value == Falcon_Camera_PID)
					{
					hCamera1 = hidHandle;
					}
					device_path = devDetail->DevicePath;//用於路徑比較
				}
				if ((Pid_count != 1)&(device_path!= devDetail->DevicePath))
				{ 
					if (Pid_Value == Falcon_Handset_PID)
					{
						hHandSet2 = hidHandle;
					}
					else if (Pid_Value == Falcon_Camera_PID)
					{
						hCamera2 = hidHandle;
					}
			
				    break;
				}
				


				//CloseHandle(hidHandle);
				++deviceNo;


				
			}
			else
			{
				CloseHandle(hidHandle);
				++deviceNo;
			}
		}
	}
	SetupDiDestroyDeviceInfoList(hDevInfo);
	return hidHandle;
}