[求助]结构体指针问题!

[ouleipeng]

struct Infor
{
char *name;
char *content;
Infor *next;
};

Infor* infor;
定义一个这样的指针,请问怎么给这个指针里的name,content初始化.

[开心爸爸84]

Infor* infor = new Infor{null, null, null};

[ouleipeng]

怎样给它赋值?

[wjb_yd]

净瞎说

[ouleipeng]

我的意思是:
CString str= "name";
CStirng strr="content";

怎么赋给结构体的name 和content

[Jncryang]

#include <string>
using namespace std;
struct Infor
{
char *name;
char *content;
Infor *next;
};
int main()
{
Infor* infor;
infor = new Infor;
string str= "name";
string strr="content";

infor->name = new char[str.length() + 1];
strcpy(infor->name, str.c_str());

infor->content = new char[strr.length() + 1];
strcpy(infor->content, strr.c_str());
return 0;
}

[太乙]

#include <stdio.h> 

#include <stdlib.h>
struct Infor 
{ 
    char *name; 
    char *content; 
    Infor *next; 
}; 
void main() 
{
	struct Infor*  infor = (struct Infor*)malloc(sizeof(struct Infor));
	infor->name = "hello";
	infor->content="world";
	infor->next = NULL;
	free(infor);
} 

[太乙]

#include <stdio.h> 
#include <afx.h>
#include <stdlib.h>
struct Infor 
{ 
    char *name; 
    char *content; 
    Infor *next; 
}; 
void main() 
{
	struct Infor*  infor = (struct Infor*)malloc(sizeof(struct Infor));
	CString cs="name",strr = "content";
	
	infor->name = (char*)malloc(sizeof(char)*cs.GetLength());
	infor->content= (char*)malloc(sizeof(char)*strr.GetLength());
	strcpy(infor->name,cs);
	strcpy(infor->content,strr);
	infor->next = NULL;
	printf("%s,%s",infor->name,infor->content);

	free(infor);
} 

[fengyizi]

你用c++里的string就不用strcpy那些函数了。

[太乙]

上面写的有点儿问题：
改改：

#include <stdio.h> 
#include <afx.h>
#include <stdlib.h>
struct Infor 
{ 
    char *name; 
    char *content; 
    Infor *next; 
}; 
void main() 
{
	struct Infor*  infor = (struct Infor*)malloc(sizeof(struct Infor));
	CString cs="name",strr = "content";
	
	infor->name = (char*)malloc(sizeof(char)*(cs.GetLength()+1));
	infor->content= (char*)malloc(sizeof(char)*(strr.GetLength()+1));
	strcpy(infor->name,cs);
	strcpy(infor->content,strr);
	infor->next = NULL;
	printf("%s,%s",infor->name,infor->content);
	free(infor->name);
	free(infor->content);
	free(infor);
} 

[zhangxichao]

#include <stdio.h> 
#include <stdlib.h>
#include <string.h>
struct Infor 
{ 
    char *name; 
    char *content; 
    Infor *next; 
};
char* set_name(struct Infor* infor, const char *na)
{
    if (infor->name != NULL)
      free(infor->name);
    infor->name = (char*)malloc(1+strlen(na));
    strcpy(infor->name, na);
    return infor->name;
}

char* set_content(struct Infor* infor, const char *cont)
{
    if (infor->content != NULL)
      free(infor->content);
    infor->content = (char*)malloc(1+strlen(cont));
    strcpy(infor->content, cont);
    return infor->content;
}
struct Infor* Infor_construct(const char *na, const char *con, struct Infor *ne)
{
    struct Infor*  infor = (struct Infor*)malloc(sizeof(struct Infor));
    infor->name = NULL;
    infor->content = NULL;
    set_name(infor, na);
    set_content(infor, con);
    infor->next = ne;
    return infor;
} 

void free_info(struct Infor *infor)
{
    free(infor->name);
    free(infor->content);
    free(infor);
}
int main(void) 
{
    struct Infor*  infor = Infor_construct("name1", "cont1", NULL);
    printf("%s %s \n", infor->name, infor->content);
    set_name(infor, "name2");
    set_content(infor, "cont2");
    printf("%s %s\n", infor->name, infor->content);
    free_info(infor);
    return 0;
} 

[budweiser]

这只是一个C型结构，直接复制就OK了

[Big鹏]

楼主注意：指针一定要分配空间的！！
定义结构体指针后，先给结构体指针分配空间，然后再给结构体中的成员（也是指针）分配空间，切记哈！！
独行写的不错！

[zhaohongbo83]

struct Infor* Infor_construct(const char *na, const char *con, struct Infor *ne)
{
struct Infor* infor = (struct Infor*)malloc(sizeof(struct Infor));
infor->name = NULL;
infor->content = NULL;
set_name(infor, na);
set_content(infor, con);
infor->next = ne;
return infor;
}
这个就很好！

[dz_huanbao]

楼主为什么不直接使用下面的定义：
struct Info
{
CString name;
CString content;
Info* next;
}

如果不支持MFC的话，不如将name和content定义为char[N]的形式，免得自己管理内存，既不方便，又容易导致内存泄露。

[ouleipeng]

谢谢各位!
我想问下,如果把这个结构体传进一个函数里,是在函数里分配空间,还是在不函数外分配.

[hngsc_0]

传指针
函数体外分配，用完释放

[hongyzniu]

#include <stdio.h> 

#include <stdlib.h>
struct Infor 
{ 
    char *name; 
    char *content; 
    Infor *next; 
}; 
void main() 
{
    struct Infor*  infor = (struct Infor*)malloc(sizeof(struct Infor));
    infor->name = "hello";
    infor->content="world";
    infor->next = NULL;
    free(infor);
} 

楼主注意：指针一定要分配空间的！！
定义结构体指针后，先给结构体指针分配空间，然后再给结构体中的成员（也是指针）分配空间，切记哈！！
独行写的不错！

[ouleipeng]

还有个问题,帮指教下.

怎样产生一个结构体链表.

还有,怎样访问这个链表.