具有結構字段的常量指針數組可能指向malloc分配的字段？

Question

int main() {    
    Employee *array[SIZE]; //Employee is a typedef struct --includes char *name, DATE *dateOfBirth, DATE is also a typedef struct, has 3 int fields month, day, year,`  

fillArray(array, &count, fpin1, fpin2);

freeMemory(array, int count);

}  

fillArray(Employee *array[], int *count,  FILE *fpin1, FILE *fpin2)  
    char buffer[MAX], buffer2[MAX];  
    while (fgets(buffer, MAX, fpin1) != NULL && fgets(buffer2, MAX, fpin2) != NULL){  
        array[*count]->name = (char *) malloc(sizeof(char)*25);  
        assert(array[*count]->name != NULL);  
        strncpy(array[*count]->name, buffer, 15);  

        strncpy(buffer2, temp, 2);
        array[*count]->dateOfBirth->day = atoi(temp)
}

代碼可以編譯，但由於分段錯誤而不斷失敗，似乎在我的fgets上失敗了？ 還是我的malloc，我在做什么錯？ 我真的似乎無法弄清楚。

另外，您將如何釋放此內存

freeMemory(Employee *array[], int count)

功能？

Answer 1

應該：

int main() {    
    Employee array[SIZE]; //Employee is a typedef struct --includes char *name, DATE *dateOfBirth, DATE is also a typedef struct, has 3 int fields month, day, year,`  

fillArray(&array, &count, fpin1, fpin2);

freeMemory(&array, int count);

}  

您沒有在任何地方分配Employee對象，因此array [0]指向某個隨機地址。

Answer 2

Employee* array[SIZE];

這是一個存儲指向Employee結構的指針的數組。

我想你是說

fillArray(Employee* array[], int* count,  FILE *fpin1, FILE *fpin2)
{
    char buffer[MAX], buffer2[MAX];
    int i = 0;
    while ( fgets(buffer, MAX, fpin1) != NULL && 
            fgets(buffer2, MAX, fpin2) != NULL )
    {
        // the array does not hold any valid memory address.
        array[i] = malloc( sizeof(Employee) );
        assert( array[i] != NULL );

        // now on the new employee add some char memory
        (array[i])->name = malloc( sizeof(char) * 25 );
        assert(array[i]->name != NULL);

        strncpy(array[i]->name, buffer, 15);
        strncpy(buffer2, temp, 2);

        array[i]->dateOfBirth->day = atoi(temp)

        ++i;
        (*count)++; 
    }  
}

除了看起來很奇怪之外，做array[*count]總是修改相同的索引。 您從未在任何地方修改*count 。

此代碼不會檢查您是否沒有超過傳遞的array的范圍。

另外：對於freeMemory()

freeMemory(Employee* array[], int count)
{
    int i = 0;
    while( i < count )
    {
        free(array[i]);
        array[i] = NULL;
        ++i;
    }  
}