c 结构体读取与保存

1.结构体保存到文本

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #define max 3
 5 
 6 typedef struct student{
 7    char name[10];  //最好用数组，方便，用指针到时写入到文本不好操作
 8    int age;
 9    int score;
10 }STU;
11 int size = sizeof(STU);
12 void write(STU *);
13 void input(STU *); 
14 void output(STU *);
15 //void clean(STU *); 
16 
17 void main(void)
18 {
19   STU kang[max];
20   input(kang);
21   output(kang);
22   write(kang); 
23   clean(kang);
24 }
25 
26 void input(STU * student)
27 {
28    char temp[10];
29    int i=0;
30    while(i<max && fgets(temp,sizeof(temp),stdin)!=NULL && temp[0]!=''  )
31    {
32       //student->name = (char *) malloc(strlen(temp)+1);  
33       strcpy(student->name,temp);
34       puts("age ?"); 
35       scanf("%d",&student->age);
36       puts("score ?");
37       scanf("%d",&student->score);
38       
39       while(getchar() != '
')
40          continue;
41   
42       student++;
43       i++;
44       if(i<max)
45         puts("next name");
46    }
47 
48 }
49 
50 void output(STU * student)
51 {
52    int i=0;
53    while(i<max)
54    {
55       printf("%d---%s---%d---%d
",i,student->name,student->age,student->score);
56       i++;
57       student++;
58    }
59 
60 }
61 
62 void write(STU * student)
63 {
64     FILE *fp;
65     int i=0;
66     if( (fp=fopen("data.txt","w+b")) == NULL )
67     {
68       puts("open error");
69     }
70    
71     while(i<max)
72     {
73        fwrite(student,size,1,fp);
74        i++;student++;
75     }
76  
77    fclose(fp);
78 
79 }
80 
81 void clean(STU * student)
82 {
83   int i=0;
84   while(i<max)
85   {
86     free(student->name);
87     i++;
88     student++;
89   }
90 }

2.读取结构体

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #define max 3
 4 
 5 typedef struct student{
 6    char name[10];
 7    int age;
 8    int score;
 9 }STU;
10 int size = sizeof(STU);
11 void read(STU *);
12 
13 void main(void)
14 {
15    STU kang[max];
16    read(kang); 
17    
18    int i=0;
19    while(i<max)
20    {
21      printf("%s---%d---%d
",kang[i].name,kang[i].age,kang[i].score);
22      i++;
23    }   
24 
25 }
26 
27 
28 void read(STU * student)
29 {
30     FILE *fp;
31     int i=0;
32     if( (fp=fopen("data.txt","a+b")) == NULL )
33     {
34       puts("open error");
35       exit(1);
36     }
37     rewind(fp);
38    while(i<max)
39    {  
40      fread(student,size,1,fp);
41      student++;i++;
42    }   
43  
44    fclose(fp);
45 
46 }