結構體嵌套二級指針

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct _Teach* pTeach;
typedef struct _Student* pStudent;


typedef struct _Teach
{
	char* name;
	pStudent*  student;
	
}Teach;


typedef struct _Student
{
	char* name;
	int age;
}Student;


void freeStruct(pTeach* pArray,int len)
{
	if(pArray != NULL)
	{
		int i,j;
		for(i=0;i<len;i++)
		{
			if(NULL != pArray[i])
			{
				if(NULL != pArray[i]->name)
				{
					free(pArray[i]->name);	
					pArray[i]->name  = NULL;
						
				}

				if(NULL != pArray[i]->student)
				{
					for(j=0;j<4;j++)
					{
						if(NULL != pArray[i]->student[j])
						{

							if(NULL != pArray[i]->student[j]->name)
							{
								free(pArray[i]->student[j]->name);		
								pArray[i]->student[j]->name  = NULL;
							}

			
							free(pArray[i]->student[j]);
							pArray[i]->student[j] = NULL;
				
						}
					}
					
					free(pArray[i]->student);
					pArray[i]->student = NULL;
				}

			free(pArray[i]);
			pArray[i]=NULL;
			}
		}	
		free(pArray);
		pArray  = NULL;

	}
}

void initStruct(pTeach** teacher,int len)
{
		
	pTeach* pArray =  malloc(sizeof(pTeach)*3);
        *teacher = pArray;

	int i,j;

	for(i=0;i<3;i++)
	{
		// teacher;
		pArray[i] = malloc(sizeof(Teach));
		pArray[i]->name  = malloc(sizeof(char)*64);
		sprintf(pArray[i]->name,"teacher_%d",i+1);
		
		// point array
		pArray[i]->student = malloc(sizeof(pStudent)*4);
		
		for(j=0;j<4;j++)
		{

			//point value;
			pArray[i]->student[j] = malloc(sizeof(Student));
			pArray[i]->student[j]->name = malloc(sizeof(char)*64);
			sprintf(pArray[i]->student[j]->name,"%s_student_%d",pArray[i]->name,j+1);
			pArray[i]->student[j]->age  = i +30;
		}
	}


}


void showStruct(pTeach* pArray,int len)
{
	if(pArray != NULL)
	{
		int i,j;
		for(i=0;i<len;i++)
		{
			printf("%s\n",pArray[i]->name);

			for(j=1;j<4;j++)
			{
				printf(" student name is :   %s,age is :%d\n",pArray[i]->student[j]->name,pArray[i]->student[j]->age);
			}
	
		}		
		
	}	


}



void test01()
{
	pTeach* pArray = NULL;
	initStruct(&pArray,3);
	showStruct(pArray,3);
	freeStruct(pArray,3);
}





int main()
{
	
	test01();
	return 0;
}

程序的輸出

[root@localhost code]# ./struct_point                           
teacher_1
 student name is :   teacher_1_student_1,age is :30
 student name is :   teacher_1_student_2,age is :30
 student name is :   teacher_1_student_3,age is :30
 student name is :   teacher_1_student_4,age is :30
teacher_2
 student name is :   teacher_2_student_1,age is :31
 student name is :   teacher_2_student_2,age is :31
 student name is :   teacher_2_student_3,age is :31
 student name is :   teacher_2_student_4,age is :31
teacher_3
 student name is :   teacher_3_student_1,age is :32
 student name is :   teacher_3_student_2,age is :32
 student name is :   teacher_3_student_3,age is :32
 student name is :   teacher_3_student_4,age is :32

 

程序的內存檢測

[root@localhost code]# valgrind --leak-check=full ./struct_point
==4840== Memcheck, a memory error detector
==4840== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==4840== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==4840== Command: ./struct_point
==4840== 
teacher_1
 student name is :   teacher_1_student_1,age is :30
 student name is :   teacher_1_student_2,age is :30
 student name is :   teacher_1_student_3,age is :30
 student name is :   teacher_1_student_4,age is :30
teacher_2
 student name is :   teacher_2_student_1,age is :31
 student name is :   teacher_2_student_2,age is :31
 student name is :   teacher_2_student_3,age is :31
 student name is :   teacher_2_student_4,age is :31
teacher_3
 student name is :   teacher_3_student_1,age is :32
 student name is :   teacher_3_student_2,age is :32
 student name is :   teacher_3_student_3,age is :32
 student name is :   teacher_3_student_4,age is :32
==4840== 
==4840== HEAP SUMMARY:
==4840==     in use at exit: 0 bytes in 0 blocks
==4840==   total heap usage: 34 allocs, 34 frees, 1,140 bytes allocated
==4840== 
==4840== All heap blocks were freed -- no leaks are possible
==4840== 
==4840== For counts of detected and suppressed errors, rerun with: -v
==4840== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 12 from 8)

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