在c中释放内存的问题

问题描述

我的任务是在动态库中为指针创建一个存储器

并释放在main函数中分配的内存..

我可以在同一侧创建和释放内存..
但反之亦然..


我的图书馆功能代码:

my task is create a memory for pointer in dynamic library

and free up the memory of allocated in the main function..

i can do create and free the memory in same side..
but i can''t perform the operation in vice versa..


my library function code:

DYNAMICLIB_API int* aa1(void)
{
    int *a1;
    a1=(int*)malloc(sizeof(int));
    printf("Interger created\n");
    printf("bye");
    printf("good");
    printf("memory created");
    free(a1);
    return a1;
}

my main function code:
int main(int argc, char* argv[])
{
    int *a1;
    a1=aa1();
    printf("Hello World!\n");
    free(a1);
    return 0;
}

免费功能会导致运行时错误..能帮帮我吗

[edit]已添加代码块-OriginalGriff [/edit]

the free function provide the run time error.. can you help me

[edit]Code block added - OriginalGriff[/edit]

推荐答案

free(a1);
return a1;

然后，您尝试再次释放它！

坏主意-永远不要返回指向任何内容的指针，除非您分配了它，并且还没有释放它.其中包括以下内容:

Then, you try to free it again!

Bad idea - never, ever return a pointer to anything unless you allocated it, and haven''t freed it. That includes things like this:

int* GetBadPointer(void)
   {
   int i = 76;
   return &i;
   }

除非您非常小心地使用指针，否则它总是会在某些时候吹到您的脸上，除非您非常小心！！

It will always blow up in your face at some point, normally when you don''t expect it, unless you are very careful with your pointers!

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