#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <iostream>
using namespace std;
int getMem3(char** myp1, int *mylen1, char** myp2, int* mylen2)
{
int ret = 0;
char *tmp1;
char* tmp2;
tmp1 = (char*)malloc(100);
strcpy(tmp1, "hello");
*mylen1 = strlen(tmp1);
*myp1 = tmp1;
tmp2 = (char*)malloc(100);
strcpy(tmp2, "python");
*mylen2 = strlen(tmp2);
*myp2 = tmp2; //二级指针的赋值形式
//myp2 = &tmp2;//如果这样值会是空的
//这样只是把tmp2指针的地址给了myp2,赋值则要指针解引
return ret;
}
int main()
{
int ret = 0;
char *p1 = NULL;
int len1 = 0;
char* p2 = NULL;
int len2 = 0;
ret = getMem3(&p1, &len1, &p2, &len2);
if (ret != 0)
{
printf("error %d\n", ret);
return ret;
}
printf("p1 is %s\n", p1);
printf("p2 is %s\n", p2);
if (p1 != NULL)
{
free(p1);
p1 = NULL;
}
if (p2 != NULL)
{
free(p2);
p2 = NULL;
}
printf("len1 is %d\n", len1);
printf("len2 is %d\n", len2);
getchar();
return 1;
}
把1,2,3写在同一个函数里面。