C 当结构确实有成员时,没有成员错误。编译器忽略声明
我在c语言中遇到了一个错误,编译器给出了以下错误: 在查看错误之前,请注意,它们要么说我有未声明的内容,然后给出了我的结构名,要么说我的结构名没有名为“head”或“tail”的成员。。。但我的结构确实有这些成员C 当结构确实有成员时,没有成员错误。编译器忽略声明,c,C,我在c语言中遇到了一个错误,编译器给出了以下错误: 在查看错误之前,请注意,它们要么说我有未声明的内容,然后给出了我的结构名,要么说我的结构名没有名为“head”或“tail”的成员。。。但我的结构确实有这些成员 File.c:31: error: expected specifier-qualifier-list before ‘LINKNODE’ File.c: In function ‘f1d’: File.c:78: warning: passing argument 4 of ‘fwr
File.c:31: error: expected specifier-qualifier-list before ‘LINKNODE’
File.c: In function ‘f1d’:
File.c:78: warning: passing argument 4 of ‘fwrite’ makes pointer from integer without a cast
File.c: In function ‘f2’:
File.c:86: error: called object ‘"ls -al "’ is not a function
File.c: In function ‘f4’:
File.c:115: error: ‘NLIST’ has no member named ‘head’
File.c:116: error: ‘LINKNODE’ undeclared (first use in this function)
File.c:116: error: (Each undeclared identifier is reported only once
File.c:116: error: for each function it appears in.)
File.c:116: error: ‘starter’ undeclared (first use in this function)
File.c:116: error: expected expression before ‘)’ token
File.c:118: error: ‘NLIST’ has no member named ‘head’
File.c:119: error: ‘Linklist’ undeclared (first use in this function)
File.c:121: error: ‘NODE’ undeclared (first use in this function)
File.c:121: error: ‘ptr’ undeclared (first use in this function)
File.c:121: error: ‘NLIST’ has no member named ‘head’
File.c:122: error: ‘NLIST’ has no member named ‘tail’
File.c:126: error: expected ‘;’ before ‘NewNode’
File.c:127: error: ‘NewNode’ undeclared (first use in this function)
File.c:129: error: ‘NLIST’ has no member named ‘tail’
File.c: In function ‘f5a’:
File.c:168: error: ‘LINKNODE’ undeclared (first use in this function)
File.c:168: error: ‘NewNode’ undeclared (first use in this function)
File.c:168: error: expected expression before ‘)’ token
File.c:170: error: ‘list’ undeclared (first use in this function)
File.c: In function ‘f5b’:
File.c:175: error: ‘NLIST’ has no member named ‘head’
File.c:175: error: ‘NLIST’ has no member named ‘head’
File.c: In function ‘printList’:
File.c:186: error: ‘LINKNODE’ undeclared (first use in this function)
File.c:186: error: ‘ptr’ undeclared (first use in this function)
File.c:186: error: ‘NLIST’ has no member named ‘head’
File.c: In function ‘createList’:
File.c:195: error: ‘LINKNODE’ undeclared (first use in this function)
File.c:195: error: ‘ptr’ undeclared (first use in this function)
File.c:195: error: expected expression before ‘)’ token
File.c:196: error: ‘NLIST’ has no member named ‘head’
File.c:198: error: ‘nextone’ undeclared (first use in this function)
File.c:198: error: expected expression before ‘)’ token
File.c:203: error: ‘NLIST’ has no member named ‘tail’
我的代码确实声明了这些对象,并且这些对象确实有那些关联的成员。一定是我忽略了一些简单的语法错误。以下是我的代码:
#include <stdio.h> /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket(), connect(), sendto(), and recvfrom() */
#include <arpa/inet.h> /* for sockaddr_in and inet_addr() */
#include <stdlib.h> /* for atoi() and exit() */
#include <string.h> /* for memset() */
#include <unistd.h> /* for close() */
#include <stdint.h>
#include <sys/types.h>
#include <fcntl.h>
#define ECHOMAX 255 /* Longest string to echo */
int sock; /* Socket descriptor */
struct sockaddr_in echoServAddr; /* Echo server address */
struct sockaddr_in fromAddr; /* Source address of echo */
unsigned short echoServPort; /* Echo server port */
unsigned int fromSize; /* In-out of address size for recvfrom() */
char *servIP; /* IP address of server */
char *echoString; /* String to send to echo server */
char echoBuffer[ECHOMAX+1]; /* Buffer for receiving echoed string */
int echoStringLen; /* Length of string to echo */
int respStringLen; /* Length of received response */
typedef struct node {
int storage;
struct node *next;
} lINKNODE;
typedef struct nlist {
LINKNODE *head;
LINKNODE *tail;
} NLIST;
char *create_substring(char *s, int first, int last)
{
int length = (last-first)+1;
char *new_str = malloc(length+1); //need an extra byte for the 0.
strncpy(new_str, s+first,length);
new_str[length] = '\0';
return new_str;
}
void f1a(char *filename,char *string){
FILE *writeto=(FILE *)fopen(filename,"a"); //fixed length? huh?
fprintf(writeto,"%s",string);
fclose(writeto);
}
void f1b(char *filename,int k){
FILE *readfrom=(FILE *)fopen(filename,"r");
char *c=malloc(1);
int i;
if (read==NULL){
fprintf(stderr,"file not opened \n");
return;
}
for (i=1;i<k-1;i++){
fgets(c,1,readfrom);
}
fclose(readfrom);
}//change
void f1c(char *filename,int k){
FILE *readfrom=(FILE *)fopen(filename,"r");
fseek(readfrom,k,0); //third argument... 0??? whence? what?
char *c;
fgets(c,1,readfrom);
printf("The kth character is %s\n",c);
fclose(readfrom); //read the kth character? print character
}//offset t? return value?
void f1d(char *filename,int k, char *sentence){
FILE *readfrom=(FILE *)fopen(filename,"rw");
if (readfrom!=NULL){
int k=fseek(readfrom,k,0);
int f=strlen(sentence);
fwrite(sentence,1,f,k);
fclose(readfrom);}
else {
printf("File could not be opened\n");
}
}
void f2(char *F,char *D){
char *command="ls -al "
strcat(command,D);
strcat(command," | grep -E \"^([& ]+ +){7}.*");
strcat(command,F);
strcat(command,"\" > t1.out");
system (command);
char *filename="t1.out";//error check as he said
FILE *readfrom=(FILE *)fopen(filename,"r");
char *currentline=malloc(200);
if (readfrom!=NULL){
char *sentence=malloc(200);
while (fgets(currentline,200,readfrom)!=NULL){
printf("%s",currentline);
}
}
}
void f3(){
int myArray[1000];
int i;
for (i=0;i<1000;i++){
myArray[i]=rand();
}
int sum=0;
for (i=0;i<1000;i++){
sum+=myArray[i];
}
printf("The array sum is %i\n",sum);
}
void f4(NLIST *LinkList){
if (LinkList->head == NULL){
LINKNODE *starter=(LINKNODE *)malloc(sizeof(LINKNODE));
starter->storage=100;
LinkList->head=starter;
Linklist->tail=starter;
}
NODE *ptr=LinkList->head;
while (ptr != LinkList->tail){
ptr=ptr->next;
}
LINKNODE NewNode=(LINKNODE *)malloc(sizeof(LINKNODE));
NewNode->storage=0;
Linklist->tail->next=NewNode;
LinkList->tail=NewNode;
}
void initsocket(int argc, char *argv[]){
if ((argc < 3) || (argc > 4)) /* Test for correct number of arguments */
{
fprintf(stderr,"Usage: %s <Server IP> <Echo Word> [<Echo Port>]\n", argv[0]);
exit(1);
}
servIP = argv[1]; /* First arg: server IP address (dotted quad)*/
echoString = argv[2]; /* Second arg: string to echo */
if ((echoStringLen = strlen(echoString)) > ECHOMAX) /* Check input length */
printf("Echo word too long");
if (argc == 4)
echoServPort = atoi(argv[3]); /* Use given port, if any */
else
echoServPort = 7; /* 7 is the well-known port for the echo service */
/* Create a datagram/UDP socket */
if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
printf("socket() failed");
/* Construct the server address structure */
memset(&echoServAddr, 0, sizeof(echoServAddr)); /* Zero out structure */
echoServAddr.sin_family = AF_INET; /* Internet addr family */
echoServAddr.sin_addr.s_addr = inet_addr(servIP); /* Server IP address */
echoServAddr.sin_port = htons(echoServPort); /* Server port */
}
void f5a(NLIST *LinkList){
LINKNODE *NewNode=(LINKNODE *)malloc(sizeof(NODE));
NewNode->storage=1231231;
list->tail->next=NewNode;
list->tail=NewNode;
}
void f5b(NLIST *LinkList){
LinkList->head=LinkList->head->next;
}
void f6(){
if (sendto(sock, echoString, echoStringLen, 0, (struct sockaddr *)
&echoServAddr, sizeof(echoServAddr)) != echoStringLen)
printf("sendto() sent a different number of bytes than expected\n");
}
void printList(NLIST *LinkList){
LINKNODE *ptr=LinkList->head;
while (ptr !=NULL){
printf("%i\n",ptr->storage);
ptr=ptr->next;
}
}
void createList(NLIST *LinkList){
int i=0;
LINKNODE *ptr=(LINKNODE *)malloc(sizeof(LINKNODE));
LinkList->head=ptr;
for (i=0;i<1000;i++){
LINKNODE *nextone=(LINKNODE *)malloc(sizeof(LINKNODE));
ptr->storage=i;
ptr->next=nextone;
ptr=nextone;
}
LinkList->tail=ptr;
}
int main(int argc,char *argv[]){
printf("%c",flb("Untitled 2.txt",5));
char *sentence=malloc(200);
FILE *readfrom=(FILE *)fopen("Untitled 2.txt","r");
fclose(readfrom);
}
#对于printf()和fprintf()包括/**/
#对于socket()、connect()、sendto()和recvfrom()包括/**/
#包括/*用于sockaddr_in和inet_addr()*/
#对于atoi()和exit(),包含/*)*/
#包含/*用于memset()*/
#包括/*用于关闭()*/
#包括
#包括
#包括
#定义要回显的ECHOMAX 255/*最长字符串*/
int sock;/*套接字描述符*/
echoServAddr;/*回显服务器地址*/
fromAddr;/*回波源地址*/
无符号短echoServPort;/*回声服务器端口*/
无符号整型fromSize;/*recvfrom()的In-out地址大小*/
char*servIP;/*服务器的IP地址*/
char*echoString;/*要发送到echo服务器的字符串*/
字符echoBuffer[ECHOMAX+1];/*接收回显字符串的缓冲器*/
int echoStringLen;/*要回显的字符串长度*/
内部响应;/*收到响应的长度*/
typedef结构节点{
int存储;
结构节点*下一步;
}链接节点;
类型定义结构列表{
链接节点*头;
链接节点*尾部;
}NLIST;
char*create_子字符串(char*s,int first,int last)
{
int length=(最后一个)+1;
char*new_str=malloc(长度+1);//需要为0添加一个额外的字节。
strncpy(新的_str,s+第一个,长度);
新的_str[length]='\0';
返回新的_str;
}
void f1a(字符*文件名,字符*字符串){
FILE*writeto=(FILE*)fopen(filename,“a”);//固定长度?嗯?
fprintf(写入,“%s”,字符串);
fclose(书面);
}
void f1b(字符*文件名,int k){
文件*readfrom=(文件*)fopen(文件名,“r”);
char*c=malloc(1);
int i;
if(read==NULL){
fprintf(stderr,“文件未打开\n”);
返回;
}
对于(i=1;ihead=starter;
链接列表->尾部=启动器;
}
节点*ptr=LinkList->head;
while(ptr!=链接列表->尾部){
ptr=ptr->next;
}
LINKNODE NewNode=(LINKNODE*)malloc(sizeof(LINKNODE));
新建节点->存储=0;
链接列表->尾部->下一步=新节点;
LinkList->tail=NewNode;
}
void initsocket(int argc,char*argv[]){
if((argc<3)| |(argc>4))/*测试参数的正确数量*/
{
fprintf(stderr,“用法:%s[]\n”,argv[0]);
出口(1);
}
servIP=argv[1];/*第一个arg:服务器IP地址(虚线四元)*/
echoString=argv[2];/*第二个arg:要回显的字符串*/
如果((echoStringLen=strlen(echoString))>ECHOMAX)/*检查输入长度*/
printf(“回显单词太长”);
如果(argc==4)
echoServPort=atoi(argv[3]);/*使用给定的端口(如果有)*/
其他的
echoServPort=7;/*7是echo服务的著名端口*/
/*创建数据报/UDP套接字*/
如果((sock=socket(PF_INET,sock_DGRAM,IPPROTO_UDP))<0)
printf(“套接字()失败”);
/*构造服务器地址结构*/
memset(&echoServAddr,0,sizeof(echoServAddr));/*零输出结构*/
echoServAddr.sin_family=AF_INET;/*互联网地址家族*/
echoServAddr.sin_addr.s_addr=inet_addr(servIP);/*服务器IP地址*/
echoServAddr.sin_port=htons(echoServPort);/*服务器端口*/
}
无效f5a(NLIST*链接列表){
LINKNODE*NewNode=(LINKNODE*)malloc(sizeof(NODE));
新建节点->存储=1231;
列表->尾部->下一步=新节点;
list->tail=NewNode;
}
无效f5b(NLIST*链接列表){
链接列表->标题=链接列表->标题->下一步;
}
无效f6(){
if(sendto(sock,echoString,echoStringLen,0,(struct sockaddr*))
&echoServAddr,sizeof(echoServAddr))!=echoStringLen)
printf(“sendto()发送的字节数与预期的不同\n”);
}
作废打印列表(NLIST*LinkList){
LINKNODE*ptr=LinkList->head;
while(ptr!=NULL){
printf(“%i\n”,ptr->storage);
ptr=ptr->next;
}
}
void createList(NLIST*LinkList){
int i=0;
LINKNODE*ptr=(LINKNODE*)malloc(sizeof(LINKNODE));
链接列表->标题=ptr;
对于(i=0;istorage=i;
ptr->next=nextone;
ptr=nextone;
}
链接列表->尾部=ptr;
}
int main(int argc,char*argv[]){
printf(“%c”,flb(“Untitled 2.txt”,5));
字符*句子=malloc(200);
文件*readfrom=(文件*)fopen(“Untitled 2.txt”,“r”);
fclose(readfrom);
}
您的代码错误百出。仅举几个例子:
- 您正在创建一个typedef
而不是lINKNODE
lINKNODE
- 在
char*command=“ls-al”
- 您使用的是
而不是Linklist
Linklist
- 您的意思是
其中NewNode->storage=0;
不是指针NewNode
LINKNODE
的类型。您已定义名为LINKNODE
的类型,带有小写字母l
这只是第一个报告的错误
当您收到一系列类似这样的错误消息时,请仔细检查第一条消息。其余的可能是编译器混乱的副作用。修复第一条错误,重新编译,迭代。(并且要小心,不要仅仅为了让编译器满意而进行更改;编译的代码不一定正确。)第一个错误是因为您声明的typedef为
lINKNODE
,但您可能输入了lINKNODE
。即,第一个字母不是c
char *command = "ls -al ";
char command[] = "ls -al ";