Windows设备信息获取：（摄像头，声卡为例）Qt,WindowsAPI对比说明（1）

简介

近期一个小项目需要获取本机摄像头，声卡的信息，提供配置文件，用作软件配置。然后开始慢慢研究，说一下自己遇到的一些坑。

系统环境

Windows：Win10 Qt:5.8.5 VS:vs2013

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相关资料

USB 获取设备VID,HID

windows SetupAPI 介绍和使用

获取指定USB设备的VID PID和SerialNumber

代码片段

USB HID,VID说明

USB 获取设备VID,HID

里边源码说明：路径：https://github.com/signal11/hidapi ， 进入下载，我选择zip,下载到本地，解压

资源结构如下：

其实Windows，主要用了两个文件，hidapi文件夹下的头文件：hidapi.h，wendows文件夹下的，hid.c资源文件，其实windows文件下有测试工程，自己可以测试下。

在上边文章里说，需要编译dll，放入工程下来调用，其实没必要，你已经拿到源码，直接把上述提到的两个文件加入到自己的工程文件里，直接调用接口就可以。

注意事项：

SetupAPI.lib库记得添加到附加库目录，否则会提示为未识别符号。

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因为在源码里边没有包含，所以需要注意自己手动在附加库里边添加。

hid.c里边添加 #pragma comment(lib,"SetupAPI.lib")；

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因为只是查询设备信息，所以只用了一下几个相关函数：

int HID_API_EXPORT hid_init(void) //驱动初始化 static HANDLE open_device(const char *path, BOOL enumerate) //打开设备，enumerate打开方式，只读，只写 int HID_API_EXPORT hid_exit(void)；//退出 struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned short vendor_id, unsigned short product_id) //获取设备相关信息 void HID_API_EXPORT HID_API_CALL hid_free_enumeration(struct hid_device_info *devs)//资源信息结构体释放 HID_API_EXPORT hid_device * HID_API_CALL hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number) //根据HID,PID,序列号，打开设备

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设备信息结构体（链表） ：hid_device_info：驱动路径，VID,PID，序列号，设备发行号，生产厂商，设备名称，设备使用页，接口编号

/** hidapi info structure */ struct hid_device_info { /** Platform-specific device path */ char *path; /** Device Vendor ID */ unsigned short vendor_id; /** Device Product ID */ unsigned short product_id; /** Serial Number */ wchar_t *serial_number; /** Device Release Number in binary-coded decimal, also known as Device Version Number */ unsigned short release_number; /** Manufacturer String */ wchar_t *manufacturer_string; /** Product string */ wchar_t *product_string; /** Usage Page for this Device/Interface (Windows/Mac only). */ unsigned short usage_page; /** Usage for this Device/Interface (Windows/Mac only).*/ unsigned short usage; /** The USB interface which this logical device represents. Valid on both Linux implementations in all cases, and valid on the Windows implementation only if the device contains more than one interface. */ int interface_number; /** Pointer to the next device */ struct hid_device_info *next; };

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下面开始说，获取设备信息函数（USB设备）：

struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned short vendor_id, unsigned short product_id) { BOOL res; struct hid_device_info *root = NULL; /* return object */ struct hid_device_info *cur_dev = NULL; /* Windows objects for interacting with the driver. */ GUID InterfaceClassGuid = { 0x4d1e55b2, 0xf16f, 0x11cf, 0x88, 0xcb, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30 }; //GUID InterfaceClassGuid = {0xCA3E7AB9, 0xB4C3, 0x4AE6, 0x82, 0x51, 0x57, 0x9E, 0xF9, 0x33, 0x89, 0x0F}; //GUID InterfaceClassGuid = {0x36fc9e60, 0xc465, 0x11cf, 0x80, 0x56, 0x44, 0x45, 0x53, 0x54, 0x00, 0x00 }; //GUID InterfaceClassGuid = { 0x4d36e96cL, 0xe325, 0x11ce, 0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18 }; SP_DEVINFO_DATA devinfo_data; SP_DEVICE_INTERFACE_DATA device_interface_data; SP_DEVICE_INTERFACE_DETAIL_DATA_A *device_interface_detail_data = NULL; HDEVINFO device_info_set = INVALID_HANDLE_VALUE; int device_index = 0; int i; if (hid_init() < 0) return NULL; /* Initialize the Windows objects. */ memset(&devinfo_data, 0x0, sizeof(devinfo_data)); devinfo_data.cbSize = sizeof(SP_DEVINFO_DATA); device_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA); /* Get information for all the devices belonging to the HID class. */ device_info_set = SetupDiGetClassDevsA(&InterfaceClassGuid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE); /* Iterate over each device in the HID class, looking for the right one. */ for (;;) { HANDLE write_handle = INVALID_HANDLE_VALUE; DWORD required_size = 0; HIDD_ATTRIBUTES attrib; res = SetupDiEnumDeviceInterfaces(device_info_set,NULL,&InterfaceClassGuid,device_index, &device_interface_data); if (!res) { /* A return of FALSE from this function means that there are no more devices. */ break; } /* Call with 0-sized detail size, and let the function tell us how long the detail struct needs to be. The size is put in &required_size. */ res = SetupDiGetDeviceInterfaceDetailA(device_info_set, &device_interface_data, NULL, 0, &required_size, NULL); /* Allocate a long enough structure for device_interface_detail_data. */ device_interface_detail_data = (SP_DEVICE_INTERFACE_DETAIL_DATA_A*) malloc(required_size); device_interface_detail_data->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A); /* Get the detailed data for this device. The detail data gives us the device path for this device, which is then passed into CreateFile() to get a handle to the device. */ res = SetupDiGetDeviceInterfaceDetailA(device_info_set, &device_interface_data, device_interface_detail_data, required_size, NULL, NULL); if (!res) { /* register_error(dev, "Unable to call SetupDiGetDeviceInterfaceDetail"); Continue to the next device. */ goto cont; } /* Make sure this device is of Setup Class "HIDClass" and has a driver bound to it. */ for (i = 0; ; i++) { char driver_name[256]; /* Populate devinfo_data. This function will return failure when there are no more interfaces left. */ res = SetupDiEnumDeviceInfo(device_info_set, i, &devinfo_data); if (!res) goto cont; res = SetupDiGetDeviceRegistryPropertyA(device_info_set, &devinfo_data, SPDRP_CLASS, NULL, (PBYTE)driver_name, sizeof(driver_name), NULL); if (!res) goto cont; if (strcmp(driver_name, "HIDClass") == 0) { /* See if there's a driver bound. */ res = SetupDiGetDeviceRegistryPropertyA(device_info_set, &devinfo_data, SPDRP_DRIVER, NULL, (PBYTE)driver_name, sizeof(driver_name), NULL); if (res) break; } } //wprintf(L"HandleName: %s\n", device_interface_detail_data->DevicePath); /* Open a handle to the device */ write_handle = open_device(device_interface_detail_data->DevicePath, TRUE); /* Check validity of write_handle. */ if (write_handle == INVALID_HANDLE_VALUE) { /* Unable to open the device. */ //register_error(dev, "CreateFile"); goto cont_close; } /* Get the Vendor ID and Product ID for this device. */ attrib.Size = sizeof(HIDD_ATTRIBUTES); HidD_GetAttributes(write_handle, &attrib); //wprintf(L"Product/Vendor: %x %x\n", attrib.ProductID, attrib.VendorID); /* Check the VID/PID to see if we should add this device to the enumeration list. */ if ((vendor_id == 0x0 || attrib.VendorID == vendor_id) && (product_id == 0x0 || attrib.ProductID == product_id)) { #define WSTR_LEN 512 const char *str; struct hid_device_info *tmp; PHIDP_PREPARSED_DATA pp_data = NULL; HIDP_CAPS caps; BOOLEAN res; NTSTATUS nt_res; wchar_t wstr[WSTR_LEN]; /* TODO: Determine Size */ size_t len; /* VID/PID match. Create the record. */ tmp = (struct hid_device_info*) calloc(1, sizeof(struct hid_device_info)); if (cur_dev) { cur_dev->next = tmp; } else { root = tmp; } cur_dev = tmp; /* Get the Usage Page and Usage for this device. */ res = HidD_GetPreparsedData(write_handle, &pp_data); if (res) { nt_res = HidP_GetCaps(pp_data, &caps); if (nt_res == HIDP_STATUS_SUCCESS) { cur_dev->usage_page = caps.UsagePage; cur_dev->usage = caps.Usage; } HidD_FreePreparsedData(pp_data); } /* Fill out the record */ cur_dev->next = NULL; str = device_interface_detail_data->DevicePath; if (str) { len = strlen(str); cur_dev->path = (char*) calloc(len+1, sizeof(char)); strncpy(cur_dev->path, str, len+1); cur_dev->path[len] = '\0'; } else cur_dev->path = NULL; /* Serial Number */ res = HidD_GetSerialNumberString(write_handle, wstr, sizeof(wstr)); wstr[WSTR_LEN-1] = 0x0000; if (res) { cur_dev->serial_number = _wcsdup(wstr); } /* Manufacturer String */ res = HidD_GetManufacturerString(write_handle, wstr, sizeof(wstr)); wstr[WSTR_LEN-1] = 0x0000; if (res) { cur_dev->manufacturer_string = _wcsdup(wstr); } /* Product String */ res = HidD_GetProductString(write_handle, wstr, sizeof(wstr)); wstr[WSTR_LEN-1] = 0x0000; if (res) { cur_dev->product_string = _wcsdup(wstr); } /* VID/PID */ cur_dev->vendor_id = attrib.VendorID; cur_dev->product_id = attrib.ProductID; /* Release Number */ cur_dev->release_number = attrib.VersionNumber; /* Interface Number. It can sometimes be parsed out of the path on Windows if a device has multiple interfaces. See http://msdn.microsoft.com/en-us/windows/hardware/gg487473 or search for "Hardware IDs for HID Devices" at MSDN. If it's not in the path, it's set to -1. */ cur_dev->interface_number = -1; if (cur_dev->path) { char *interface_component = strstr(cur_dev->path, "&mi_"); if (interface_component) { char *hex_str = interface_component + 4; char *endptr = NULL; cur_dev->interface_number = strtol(hex_str, &endptr, 16); if (endptr == hex_str) { /* The parsing failed. Set interface_number to -1. */ cur_dev->interface_number = -1; } } } } cont_close: CloseHandle(write_handle); cont: /* We no longer need the detail data. It can be freed */ free(device_interface_detail_data); device_index++; } /* Close the device information handle. */ SetupDiDestroyDeviceInfoList(device_info_set); return root; }

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hid_enumerate(unsigned short vendor_id, unsigned short product_id)，函数思路主要为：根据GUID,获取设备信息句柄，遍历符合此信息句柄的所有设备，如果没有匹配设备，则退出，查询设备信息。

GUID：GUID InterfaceClassGuid = { 0x4d1e55b2, 0xf16f, 0x11cf, 0x88, 0xcb, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30 };

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自己测试，这个设备GUID，只能得到鼠标和键盘的设备信息。

根据GUID获取句柄信息

device_info_set = SetupDiGetClassDevsA(&InterfaceClassGuid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

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下边三个函数时获取设备接口信息，设备接口详细信息

res = SetupDiEnumDeviceInterfaces(device_info_set,NULL,&InterfaceClassGuid,device_index,&device_interface_data); res = SetupDiGetDeviceInterfaceDetailA(device_info_set,&device_interface_data,NULL,0, &required_size,NULL); res = SetupDiGetDeviceInterfaceDetailA(device_info_set,&device_interface_data, device_interface_detail_data, required_size, NULL, NULL);

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获取设备驱动类型｛SPDRP_CLASS｝：注意参数变化

res = SetupDiGetDeviceRegistryPropertyA(device_info_set, &devinfo_data,SPDRP_CLASS, NULL, (PBYTE)driver_name, sizeof(driver_name), NULL); res = SetupDiGetDeviceRegistryPropertyA(device_info_set, &devinfo_data, SPDRP_DRIVER, NULL, (PBYTE)driver_name, sizeof(driver_name), NULL);

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后边是根据设备信息，获取HID,VID，然后根据相关信息获取设备详细信息，得到所需要的参数。

后来我用了另一个方法，没有找到需要的设备。

获取指定USB设备的VID PID和SerialNumber

struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate_all(char * DeviceClassName) { BOOL res; struct hid_device_info *root = NULL; /* return object */ struct hid_device_info *cur_dev = NULL; /* Windows objects for interacting with the driver. */ GUID InterfaceClassGuid = {0}; SP_DEVINFO_DATA devinfo_data; SP_DEVICE_INTERFACE_DATA device_interface_data; SP_DEVICE_INTERFACE_DETAIL_DATA_A *device_interface_detail_data = NULL; HDEVINFO device_info_set = INVALID_HANDLE_VALUE; DWORD nSize = 0 ; if (hid_init() < 0) return NULL; /* Initialize the Windows objects. */ memset(&devinfo_data, 0x0, sizeof(devinfo_data)); devinfo_data.cbSize = sizeof(SP_DEVINFO_DATA); device_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA); /* Get information for all the devices belonging to the HID class. */ device_info_set = SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_ALLCLASSES); /* Iterate over each device in the HID class, looking for the right one. */ TCHAR szDIS[MAX_PATH]; // Device Identification Strings, for (int i = 0; SetupDiEnumDeviceInfo(device_info_set, i, &devinfo_data); i++) { nSize = 0; if (!SetupDiGetDeviceInstanceId(device_info_set, &devinfo_data, szDIS, sizeof(szDIS), &nSize)) { break; } // 设备识别串的前三个字符是否是"USB", 模板： USB\VID_XXXX&PID_XXXX\00000xxxxxxx char _cClassName[MAX_PATH] = { 0 }; wchar_t _cDeviceName[MAX_PATH] = { 0 }; char ClassName[MAX_PATH] = { 0 }; int _res = SetupDiGetDeviceRegistryProperty(device_info_set, &devinfo_data, SPDRP_CLASS, NULL, _cClassName, MAX_PATH, NULL); sprintf(ClassName, "%ls", _cClassName); if (strcmp(ClassName, DeviceClassName) == 0) { int res = SetupDiGetDeviceRegistryProperty(device_info_set, &devinfo_data, SPDRP_FRIENDLYNAME, NULL, _cDeviceName, sizeof(_cDeviceName), NULL); struct hid_device_info *tmp = NULL; tmp = (struct hid_device_info*) calloc(1, sizeof(struct hid_device_info)); if (cur_dev) { cur_dev->next = tmp; } else { root = tmp; } cur_dev = tmp; tmp->product_string = _wcsdup( _cDeviceName); //VID-PID if (strcmp(ClassName, "Camera") == 0) { tmp->vendor_id = (szDIS[8] - 0x30) * 16 * 16 * 16 + (szDIS[9] - 0x30) * 16 * 16 + (szDIS[10] - 0x30) * 16 + (szDIS[11] - 0x30); tmp->product_id = (szDIS[17] - 0x30) * 16 * 16 * 16 + (szDIS[18] - 0x30) * 16 * 16 + (szDIS[19] - 0x30) * 16 + (szDIS[20] - 0x30); } // wprintf(L"%ls\n", tmp->product_string); } } free(device_interface_detail_data); SetupDiDestroyDeviceInfoList(device_info_set); return root; }

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获取本机所有设备信息；

device_info_set = SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_ALLCLASSES);

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拿到设备信息，设备数量，遍历

SetupDiEnumDeviceInfo(device_info_set, i, &devinfo_data)

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得到设备实例路径

SetupDiGetDeviceInstanceId(device_info_set, &devinfo_data, szDIS, sizeof(szDIS), &nSize)

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样例如下：

USB\VID_04F2&PID_B627&MI_00\6&385EEBCF&0&0000

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拿到设备类名：SPDRP_CLASS

SetupDiGetDeviceRegistryProperty(device_info_set, &devinfo_data, SPDRP_CLASS, NULL, _cClassName, MAX_PATH, NULL);

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与需求设备类名做对比，相同则获取设备名称：

if (strcmp(ClassName, DeviceClassName) == 0)

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获取设备名称：SPDRP_FRIENDLYNAME，注意输出宽字节问题。

SetupDiGetDeviceRegistryProperty(device_info_set, &devinfo_data, SPDRP_FRIENDLYNAME, NULL, _cDeviceName, sizeof(_cDeviceName), NULL);

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按照标准样例，获取HID，PID，为16进制，做了一个转换处理

tmp->vendor_id = (szDIS[8] - 0x30) * 16 * 16 * 16 + (szDIS[9] - 0x30) * 16 * 16 + (szDIS[10] - 0x30) * 16 + (szDIS[11] - 0x30); tmp->product_id = (szDIS[17] - 0x30) * 16 * 16 * 16 + (szDIS[18] - 0x30) * 16 * 16 + (szDIS[19] - 0x30) * 16 + (szDIS[20] - 0x30);

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setupAPI一些相关说明

SetupDiGetDeviceRegistryProperty(device_info_set, &devinfo_data, SPDRP_FRIENDLYNAME, NULL, _cDeviceName, sizeof(_cDeviceName), NULL);

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这些参数信息为：设备管理器，里边详细信息，做对照看一下即可。

#define SPDRP_DEVICEDESC (0x00000000) #define SPDRP_HARDWAREID (0x00000001) #define SPDRP_COMPATIBLEIDS (0x00000002) #define SPDRP_UNUSED0 (0x00000003) #define SPDRP_SERVICE (0x00000004) #define SPDRP_UNUSED1 (0x00000005) #define SPDRP_UNUSED2 (0x00000006) #define SPDRP_CLASS (0x00000007) #define SPDRP_CLASSGUID (0x00000008) #define SPDRP_DRIVER (0x00000009) #define SPDRP_CONFIGFLAGS (0x0000000A) #define SPDRP_MFG (0x0000000B) #define SPDRP_FRIENDLYNAME (0x0000000C) #define SPDRP_LOCATION_INFORMATION (0x0000000D) #define SPDRP_PHYSICAL_DEVICE_OBJECT_NAME (0x0000000E) #define SPDRP_CAPABILITIES (0x0000000F) #define SPDRP_UI_NUMBER (0x00000010) #define SPDRP_UPPERFILTERS (0x00000011) #define SPDRP_LOWERFILTERS (0x00000012) #define SPDRP_BUSTYPEGUID (0x00000013) #define SPDRP_LEGACYBUSTYPE (0x00000014) #define SPDRP_BUSNUMBER (0x00000015) #define SPDRP_ENUMERATOR_NAME (0x00000016) #define SPDRP_SECURITY (0x00000017) #define SPDRP_SECURITY_SDS (0x00000018) #define SPDRP_DEVTYPE (0x00000019) #define SPDRP_EXCLUSIVE (0x0000001A) #define SPDRP_CHARACTERISTICS (0x0000001B) #define SPDRP_ADDRESS (0x0000001C) #define SPDRP_UI_NUMBER_DESC_FORMAT (0X0000001D) #define SPDRP_DEVICE_POWER_DATA (0x0000001E) #define SPDRP_REMOVAL_POLICY (0x0000001F) #define SPDRP_REMOVAL_POLICY_HW_DEFAULT (0x00000020) #define SPDRP_REMOVAL_POLICY_OVERRIDE (0x00000021) #define SPDRP_INSTALL_STATE (0x00000022) #define SPDRP_LOCATION_PATHS (0x00000023) #define SPDRP_MAXIMUM_PROPERTY (0x00000024) #define SPCRP_SECURITY (0x00000017) #define SPCRP_SECURITY_SDS (0x00000018) #define SPCRP_DEVTYPE (0x00000019) #define SPCRP_EXCLUSIVE (0x0000001A) #define SPCRP_CHARACTERISTICS (0x0000001B) #define SPCRP_MAXIMUM_PROPERTY (0x0000001C)

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样例;

//设备描述类名 根据类名查找对应设备 #define Camera "Camera" #define Media "MEDIA" #define Audio "AudioEndpoint"

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简单调用，放入QStringList

QStringList FileConsole::GetAudioDeviceNames() { QStringList strDeviceNames; struct hid_device_info *devs, *cur_dev; if (hid_init()) return{}; devs = hid_enumerate_all(Audio); cur_dev = devs; while (cur_dev) { QString name = QString::fromWCharArray(cur_dev->product_string); // qDebug() << " Product: " << name; strDeviceNames.push_back(name); cur_dev = cur_dev->next; } hid_free_enumeration(devs); return strDeviceNames; }

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Qt自带设备信息获取。

因为Qt自带获取，忘记把源码上传了，直接拿帮助文档来说明。

Qt下边有两个类：

QAudioDeviceInfo Class //音频设备信息类 QCameraInfo Class //摄像头信息类

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摄像头信息类获取本地所有设备：

这是帮助文档里边的一句话：关键:两个函数，一个获取默认摄像设备信息，一个是所有设备信息

The static functions defaultCamera() and availableCameras() provide you a list of all available cameras.

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遍历打印所有驱动名称，即可以根据这些信息做相关处理。

QList cameras = QCameraInfo::availableCameras(); foreach (const QCameraInfo &cameraInfo, cameras) qDebug() << cameraInfo.deviceName();

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音频设备信息获取：

帮助文档的一句话：注意几个关键词：默认输入设备，默认输出设备，所有设备信息。还有 QAudio::Mode.

The static functions defaultInputDevice(), defaultOutputDevice(), and availableDevices() let you get a list of all available devices. Devices are fetched according to the value of mode this is specified by the QAudio::Mode enum. The QAudioDeviceInfo returned are only valid for the QAudio::Mode.

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availableDevices(QAudio::Mode) ;

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Mode的枚举参数如下

如上，遍历打印所有设备的名称。注意参数：这是QAudio::AudioOutput 所有输出音频输出设备，即还要

foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput)) qDebug() << "Device name: " << deviceInfo.deviceName();

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foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioIntput)) qDebug() << "Device name: " << deviceInfo.deviceName();

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其他问题

我把编好的exe放到其他电脑上的时候，发现并没有获取他本地的一些设备信息，不管是Qt写的还是调用windowsAPI，都没有得到，所有系统兼容问题还得随后测试，调试。

如果有结果，随后发布。

源码

这次就不放源码了，已经说明的很详细了，如果有需要，留言就可以。

其他说明，见下文：Windows设备信息获取：（摄像头，声卡为例)Qt,WindowsAPI对比说明（2）

API Qt Windows

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