C struct 隐藏结构体成员

 1 //obj.h
 2 
 3 #include <stdio.h>
 4 #include <stdlib.h>
 5 #include <string.h>
 6 
 7 typedef struct Obj Obj;
 8 
 9 Obj * CreateObject(int id, const char * name);
10 
11 void PrintObject(Obj * obj);
12 
13 int GetId(Obj * obj);
14 
15 char * GetName(Obj * obj);
16 
17 
18 //obj.c
19 
20 #include "obj.h"
21 
22 struct Obj {
23     int id;
24     char name[32];
25 };
26 
27 Obj * CreateObject(int id, const char * name)
28 {
29     Obj * ret = (Obj*)malloc(sizeof(Obj));
30     if (ret)
31     {
32         ret->id = id;
33         strcpy_s(ret->name, 32, name);
34     }
35     return ret;
36 }
37 
38 void PrintObject(Obj * obj)
39 {
40     printf("obj->id = %d, obj->name = %s\n", obj->id, obj->name);
41 }
42 
43 int GetId(Obj * obj)
44 {
45     return obj->id;
46 }
47 
48 char * GetName(Obj * obj)
49 {
50     return obj->name;
51 }
52 
53 //main.c
54 
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include "obj.h"
59 
60 int main()
61 {
62     Obj * o1 = NULL;
63     Obj * o2 = NULL;
64 
65     char name[32] = "two";
66     o1 = CreateObject(10, "ten");
67     o2 = CreateObject(2, name);
68 
69     PrintObject(o1);
70     PrintObject(o2);
71 
72     printf("o1->id = %d, o1->name = %s\n", GetId(o1), GetName(o1));
73 
74     puts("\n按回车键继续");
75     getchar();
76     return 0;
77 }