简单问题，大家看看

[pipilang]

目的是想把一个IP形式的字符串，存入一个ip结构里面。
没有做成函数的时候都是好的，但换成函数后输出的结果就不
对了，帮帮看看呀

#include "stdio.h"
#include "string.h"
#include "stdlib.h"

typedef struct IP{
char * field_one;
char * field_two;
char * field_thress;
char * field_four;

}*IPaddress;

IPaddress IPtoStruct(char IPstr[]){
int i=0;
char *str;
char temp[4][4];
IPaddress IPstruct;

IPstruct = (IPaddress)malloc(sizeof(IPaddress));

if(IPstruct==NULL){

printf("Insufficient memory available\n");

}else{

str = strtok(IPstr,".");

strcpy(temp[i],str);

while(str!=NULL){

str=strtok(NULL,".");

if(i<3)strcpy(temp[++i],str);

}

IPstruct->field_one = temp[0];
IPstruct->field_two = temp[1];
IPstruct->field_thress = temp[2];
IPstruct->field_four = temp[3];
}

return IPstruct;
}

void main(){

char p[]="127.0.0.1";


IPaddress g ;

g = (IPaddress)malloc(sizeof(IPaddress));

g = IPtoStruct(p);

printf("%s %s %s %s\n",g->field_one,g->field_two,g->field_thress,g->field_four);


}

[lovefreex]

#include "stdio.h"
#include "string.h"
#include "stdlib.h"

typedef struct IP{
char * field_one;
char * field_two;
char * field_thress;
char * field_four;

}*IPaddress;

IPaddress IPtoStruct(char IPstr[]){
int i=0;
char *str;
char *temp[4]; //这边用指针数组
IPaddress IPstruct;

IPstruct = (IPaddress)malloc(sizeof(IPaddress));

if(IPstruct==NULL){

printf("Insufficient memory available\n");

}else{

str = strtok(IPstr,".");

temp[i] = str; //存放字符串地址

while(str!=NULL){

str=strtok(NULL,".");

if(i<3)temp[++i] = str;

}

IPstruct->field_one = temp[0];
IPstruct->field_two = temp[1];
IPstruct->field_thress = temp[2];
IPstruct->field_four = temp[3];
}

return IPstruct;
}

void main(){

char p[]="127.0.0.1";


IPaddress g ;

g = (IPaddress)malloc(sizeof(IPaddress));

g = IPtoStruct(p);

printf("%s %s %s %s\n",g->field_one,g->field_two,g->field_thress,g->field_four);


}

[pipilang]

谢谢了，看来基础还是很重要哈~

你能更详细的说，为什么会出现这样的问题吗？

[pipilang]

还有就是能有什么别的实现方法没有？
比如标准c里面本来的函数：）
更简单高效的也可以：）

[lovefreex]

IPstruct->field_one = temp[0];
IPstruct->field_two = temp[1];
IPstruct->field_thress = temp[2];
IPstruct->field_four = temp[3];
这些是把数组的地址给指针变量，而这些地址在你定义二维数组时就分配了，但作用域只是这个函数内，一旦离开函数，地址就变的没有意义了。
关于转换在网络编程中有这样的函数直接转换的，不熟悉，呵呵~~

[yuchengliu]

#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "conio.h"

typedef struct IP{
char * field_one;
char * field_two;
char * field_thress;
char * field_four;

}IPaddress;

IPaddress IPstruct;

IPaddress IPtoStruct(char IPstr[]){
int i=0;
char *str;
char *temp[4];
// IPaddress IPstruct;

// IPstruct = (IPaddress)malloc(sizeof(IPaddress));

// if(IPstruct==NULL){
//
// printf("Insufficient memory available\n");
//
// }else
{

str = strtok(IPstr,".");

// strcpy(temp[i],str);
temp[i] = str;
while(str!=NULL)
{

str=strtok(NULL,".");

if(i<3)
// strcpy(temp[++i],str);
temp[++i] = str;

}

IPstruct.field_one = temp[0];
IPstruct.field_two = temp[1];
IPstruct.field_thress = temp[2];
IPstruct.field_four = temp[3];
}

return IPstruct;
}

void main(){

char p[]="127.0.0.1";


// IPaddress g ;

// g = (IPaddress)malloc(sizeof(IPaddress));

IPtoStruct(p);

// printf("%s %s %s %s\n",g->field_one,g->field_two,g->field_thress,g->field_four);
printf("%s %s %s %s\n",IPstruct.field_one,IPstruct.field_two,IPstruct.field_thress,IPstruct.field_four);

getch();
}

[pipilang]

谢谢咯：）