request for member 'flags' in something not a structure or union

最新推荐文章于 2022-09-06 11:27:56 发布
原创 最新推荐文章于 2022-09-06 11:27:56 发布 · 3.9k 阅读 · 1 ·
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本文解析了一个常见的编程错误：尝试在非结构体或联合体中使用结构指针成员。该问题通常发生在试图通过点操作符访问指针所指向的结构体成员时。正确的做法应该是使用箭头操作符而非点操作符。
request for member 'flags' in something not a structure or union错误
原因：结构指针没有正确使用，如struct *p ； 应该p->flags调用，而错误的使用了p.flags 。
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这种错误也是比较隐晦，因为错误不在本行。但是肯定可以确定就是在那一行的前后，但是要确定是上面的某一行少了逗号，还是要费些周章。
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C语言错误：request for member ‘xxx’ in something not a structure or union
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typedef struct tp_packet_s { user_port_list uportList; /* ����: ��������:ָ�����Ͷ˿ڣ�����ǹ㲥����:ָ���ų��˿� */ /* �հ�: �յ����ĵ��߼��˿ڣ�����LAG��Ϣ */ UINT32 flags; /* ָ�����ͱ�ʶ */ int len; /* ���ij��� */ UINT16 tpid; /* VLAN tag tpid*/ UINT16 vid; /* VLAN tag vlan id */ UINT8 pri; /* VLAN tag pri */ UINT8 cfi; /* VLAN tag cfi */ UINT8 inner_vtag[4]; /*QinQ VLAN tag ֱ�Ӵ�*/ UINT8 rx_unit; /* �ѵ�ϵͳ���յ����ĵ�unit�ţ��Ƕѵ�ϵͳΪ0 */ UINT8 rx_port; /* �յ����ĵ����˿ںţ���1��ʼ��������LAG�����Ϣ */ UINT8 rec_port; /* �ݲ��� */ UINT8 rx_untag; /* 1:no innertag, 2:no outertag */ UINT8 src_unit; /* �ݲ��ã�src uint stored in tp tag, begin from 1, don't take care of its value */ UINT8 *packet; /* �������� */ UINT8 *cluster; /* �ڲ�ʹ�� */ }TP_PACKET_T; static int smartLinkFlushRsp(IN TP_PACKET_T *tp_pkt) {UINT16 up_get = 0; up_get = UP_PORT(tp_pkt->rx_port);} 报错：smartLink_pro.c:731: error: request for member 'p_un' in something not a structure or union
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smartLink_pro.c:731: error: request for member 'p_un' in something not a structure or union ``` 但你在 `smartLinkFlushRsp` 函数中只写了如下代码： ```c static int smartLinkFlushRsp(IN TP_PACKET_T *tp...
编译的时候报错了，该怎么修改代码解决？ PATH=“/mydisk/platform/buildroot/build/armv8/host/bin:/mydisk/platform/buildroot/build/armv8/host/sbin:/usr/local/bin:/home/felix/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin” /usr/bin/make -j4 -C /mydisk/platform/buildroot/build/armv8/build/tplink/gpioReset-1.0/ Scanning dependencies of target gpioReset [ 33%] Building C object CMakeFiles/gpioReset.dir/srvcGpioReset.c.o [ 66%] Building C object CMakeFiles/gpioReset.dir/mainGpioReset.c.o srvcGpioReset.c: In function ‘gpioResetSrvc’: srvcGpioReset.c:22:16: error: ‘ERR_INIT’ undeclared (first use in this function); did you mean ‘ESRMNT’? return ERR_INIT; ^~~~~~~~ ESRMNT srvcGpioReset.c:22:16: note: each undeclared identifier is reported only once for each function it appears in srvcGpioReset.c:80:12: error: ‘ERR_NO_ERROR’ undeclared (first use in this function); did you mean ‘PAL_MQ_ERROR’? return ERR_NO_ERROR; ^~~~~~~~~~~~ PAL_MQ_ERROR srvcGpioReset.c: In function ‘gpioResetSrvcExit’: srvcGpioReset.c:86:12: error: ‘ERR_NO_ERROR’ undeclared (first use in this function); did you mean ‘PAL_MQ_ERROR’? return ERR_NO_ERROR; ^~~~~~~~~~~~ PAL_MQ_ERROR srvcGpioReset.c:87:1: error: control reaches end of non-void function [-Werror=return-type] } ^ cc1: all warnings being treated as errors CMakeFiles/gpioReset.dir/build.make:78: recipe for target ‘CMakeFiles/gpioReset.dir/srvcGpioReset.c.o’ failed make[4]: *** [CMakeFiles/gpioReset.dir/srvcGpioReset.c.o] Error 1 make[4]: *** Waiting for unfinished jobs… mainGpioReset.c: In function ‘init_gpio_reset’: mainGpioReset.c:89:5: error: unknown type name ‘shell_init_func_t’ shell_init_func_t shell_initfunc = {}; ^~~~~~~~~~~~~~~~~ mainGpioReset.c:89:40: error: empty scalar initializer shell_init_func_t shell_initfunc = {}; ^ mainGpioReset.c:89:40: note: (near initialization for ‘shell_initfunc’) mainGpioReset.c:90:28: error: request for member ‘mm_init_table’ in something not a structure or union memcpy(&(shell_initfunc.mm_init_table), &initFunc, sizeof(mm_app_init_t)); ^ mainGpioReset.c:91:5: error: implicit declaration of function ‘shell_regfunc’ [-Werror=implicit-function-declaration] shell_regfunc(MODULE_GPIO_RESET_INDEX, shell_initfunc, srvc, mm_app_srvc_size(srvc), GPIO_RESET_SUB_NAME); ^~~~~~~~~~~~~ mainGpioReset.c:91:19: error: ‘MODULE_GPIO_RESET_INDEX’ undeclared (first use in this function); did you mean ‘SRVC_GPIO_RESET_H’? shell_regfunc(MODULE_GPIO_RESET_INDEX, shell_initfunc, srvc, mm_app_srvc_size(srvc), GPIO_RESET_SUB_NAME); ^~~~~~~~~~~~~~~~~~~~~~~ SRVC_GPIO_RESET_H mainGpioReset.c:91:19: note: each undeclared identifier is reported only once for each function it appears in cc1: all warnings being treated as errors CMakeFiles/gpioReset.dir/build.make:65: recipe for target ‘CMakeFiles/gpioReset.dir/mainGpioReset.c.o’ failed make[4]: *** [CMakeFiles/gpioReset.dir/mainGpioReset.c.o] Error 1 CMakeFiles/Makefile2:78: recipe for target ‘CMakeFiles/gpioReset.dir/all’ failed make[3]: *** [CMakeFiles/gpioReset.dir/all] Error 2 Makefile:132: recipe for target ‘all’ failed make[2]: *** [all] Error 2 package/tplink/tplink-generic.mk:289: recipe for target ‘/mydisk/platform/buildroot/build/armv8/build/tplink/gpioReset-1.0/.stamp_built’ failed make[1]: *** [/mydisk/platform/buildroot/build/armv8/build/tplink/gpioReset-1.0/.stamp_built] Error 2 Makefile:84: recipe for target ‘_all’ failed make: *** [_all] Error 2 下面是现在的代码： main： /*!Copyright (c) 2010-2011 TP-LINK Technologies CO.,LTD. *All rights reserved. * *\file mainRebootScheduleCpn.c *\brief * *\author Yang Jingjing *\version *\date 2025-09-09 */ /**************************************************************************************************/ /* INCLUDE_FILES */ /**************************************************************************************************/ /* libc header */ #include <stdio.h> #include <unistd.h> #include "fepDefs.h" #include "pal/msgq.h" #include "tpDbg/tpdebug.h" #include "mm/mm.h" #include "common/applError.h" #include "srvcGpioReset.h" /**************************************************************************************************/ /* DEFINES */ /**************************************************************************************************/ #define GPIO_RESET_USR_NAME_MAX_LEN 10 #define GPIO_RESET_SUB_NAME "GPIO_RESET" /**************************************************************************************************/ /* TYPES */ /**************************************************************************************************/ /**************************************************************************************************/ /* EXTERN_PROTOTYPES */ /**************************************************************************************************/ /**************************************************************************************************/ /* LOCAL_PROTOTYPES */ /**************************************************************************************************/ /**************************************************************************************************/ /* VARIABLES */ /**************************************************************************************************/ static mm_app_prvt_srvc_t srvc[] = { { .tid = PAL_THREAD_ERROR, .func = gpioResetSrvc, .pre_exit_f = gpioResetSrvcExit, .name = "gpio-reset", .start = MM_APP_SRVC_IDLE, .stack_size = SRVC_GPIO_RESET_STACK_SIZE_DEFAULT, .prio = SRVC_GPIO_RESET_PRIO_DEFAULT, .srvc_id = GPIO_RESET_PRVT_SRVC, .meta_arg = NULL } }; /**************************************************************************************************/ /* LOCAL_FUNCTIONS */ /**************************************************************************************************/ /**************************************************************************************************/ /* PUBLIC_FUNCTIONS */ /**************************************************************************************************/ static __attribute__((constructor)) int init_gpio_reset() { mm_app_init_t initFunc = {0}; DBG("GPIO Reset main start."); // 初始化函数表（保留基本结构，简化不必要的初始化） initFunc._init_platform = NULL; initFunc._init_private = NULL; initFunc._init_public = NULL; initFunc._init_application = NULL; initFunc._init_preconfig = NULL; initFunc._init_defconfig = NULL; initFunc._init_loadconfig = NULL; initFunc._init_stable = NULL; shell_init_func_t shell_initfunc = {}; memcpy(&(shell_initfunc.mm_init_table), &initFunc, sizeof(mm_app_init_t)); shell_regfunc(MODULE_GPIO_RESET_INDEX, shell_initfunc, srvc, mm_app_srvc_size(srvc), GPIO_RESET_SUB_NAME); DBG("GPIO Reset main loop."); return 0; } srvc: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> #include "srvcGpioReset.h" #include "tpDbg/tpdebug.h" int gpioResetSrvc(void *param) { struct sockaddr_nl src_addr, dest_addr; struct nlmsghdr *nlh = NULL; struct iovec iov; struct msghdr msg; int sock_fd, ret; // 创建Netlink socket sock_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GPIO_EVENT); if (sock_fd < 0) { DBG_ERR("Failed to create netlink socket: %s", strerror(errno)); return ERR_INIT; } memset(&src_addr, 0, sizeof(src_addr)); src_addr.nl_family = AF_NETLINK; src_addr.nl_pid = getpid(); // 应用进程ID src_addr.nl_groups = 1; // 加入组播组1 // 绑定socket if (bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr))) { DBG_ERR("Bind failed: %s", strerror(errno)); close(sock_fd); return ERR_INIT; } // 准备接收缓冲区 nlh = (struct nlmsghdr *)malloc(NLMSG_SPACE(sizeof(struct gpio_netlink_msg))); if (!nlh) { DBG_ERR("Memory allocation failed"); close(sock_fd); return ERR_INIT; } memset(nlh, 0, NLMSG_SPACE(sizeof(struct gpio_netlink_msg))); iov.iov_base = (void *)nlh; iov.iov_len = NLMSG_SPACE(sizeof(struct gpio_netlink_msg)); memset(&msg, 0, sizeof(msg)); msg.msg_name = (void *)&dest_addr; msg.msg_namelen = sizeof(dest_addr); msg.msg_iov = &iov; msg.msg_iovlen = 1; DBG("GPIO Reset service started. Waiting for reset events..."); while (1) { // 接收Netlink消息 ret = recvmsg(sock_fd, &msg, 0); if (ret < 0) { DBG_ERR("recvmsg error: %s", strerror(errno)); continue; } // 解析消息 struct gpio_netlink_msg *msg_data = (struct gpio_netlink_msg *)NLMSG_DATA(nlh); // 检查是否为reset事件 if (strcmp(msg_data->button_name, "reset") == 0) { DBG("=== RESET EVENT DETECTED ==="); DBG("Event type: %u", msg_data->event_type); DBG("Value: %d", msg_data->value); DBG("Timestamp: %lu", msg_data->timestamp); DBG("============================"); } } free(nlh); close(sock_fd); return ERR_NO_ERROR; } int gpioResetSrvcExit(void *param) { // 清理资源的位置（实际在循环中不会退出） return ERR_NO_ERROR; } srvc.h: #ifndef _SRVC_GPIO_RESET_H_ #define _SRVC_GPIO_RESET_H_ #ifdef __cplusplus extern "C" { #endif #include <linux/netlink.h> #include <sys/socket.h> // 与内核相同的定义 #define NETLINK_GPIO_EVENT 31 #define SRVC_GPIO_RESET_STACK_SIZE_DEFAULT 10240 #define SRVC_GPIO_RESET_PRIO_DEFAULT PAL_THREAD_PRIO_IGNORE #define GPIO_RESET_PRVT_SRVC 0 // Netlink消息结构（与内核保持一致） struct gpio_netlink_msg { char button_name[32]; unsigned int event_type; int value; unsigned long timestamp; }; int gpioResetSrvc(void *param); int gpioResetSrvcExit(void *param); #ifdef __cplusplus } #endif #endif // _SRVC_GPIO_RESET_H_
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