相同HID设备的句柄获取

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最近项目上需要做一个小上位机，获取相同HID设备的信息，并逐个进行系统设置。

经过1天的调试，已经完成了。前期在相同HID设备句柄获取方面，受到了一点小小的阻力，网上也没有获取到相关的信息，可能有遇到同样问题的朋友，把我的解决方式贴出来，或许会有点作用吧。

基于VS2015，使用MFC自带USB类库。核心代码如下，思路其实很简单：通常我们使用PID和VID来获得不同设备的句柄，相同PID和VID的设备，就需要其他的特征来获取句柄，调试过程中发现，相同HID的设备，设备路径是不同的，可以用设备路径作为区分，来获得句柄即可。

HANDLE OpenSamePIDDevice(int overlapped, unsigned short Pid_Value){int Pid_count = 0;LPCWSTR device_path = NULL;HANDLE hidHandle = NULL;HidD_GetHidGuid(&hidGuid); //取得类别 HDEVINFO hDevInfo = SetupDiGetClassDevs(&hidGuid, NULL, NULL,(DIGCF_PRESENT | DIGCF_DEVICEINTERFACE));  //获取设备信息群if (hDevInfo == INVALID_HANDLE_VALUE)//未获得设备信息群则直接退出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)) //枚举成功？{ULONG requiredLength = 0;SetupDiGetInterfaceDeviceDetail(hDevInfo, &devInfoData, NULL, 0, &requiredLength, NULL);//获得接口详细信息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))//获得详细信息失败则退出{free(devDetail);SetupDiDestroyDeviceInfoList(hDevInfo);return INVALID_HANDLE_VALUE;}if (overlapped) //打开设备{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))   //仅仅根据VID进行STM32设备判断{++Pid_count;if (Pid_count == 1){ //获得句柄if(Pid_Value == Falcon_Handset_PID){ hHandSet1 = hidHandle;}else if(Pid_Value == Falcon_Camera_PID){hCamera1 = hidHandle;}device_path = devDetail->DevicePath;//用于路径比较}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;}

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