请告诉我wat是我的代码中的问题 [英] Plz tell me wat is the problem in my code

问题描述

typedef struct ListItem
    {
        char* Serial_Number;
        struct ListItem *pstNextListItem
    }ListItem_t;

ListItem_t ListItem;
ListItem_t *stoNext;
stoNext = ListItem.pstNextListItem;
*str_ID = stoNext->Serial_Number;
printf("%s",str_ID);

问题是
str_ID的值是打印一些垃圾值，而不是实际值.

the problem is that
The value of str_ID is printing some junk value and not the actual value.
Can anyone please rectify the problem?

推荐答案

您需要创建实例以使指针指向:

You need to create instances for the pointers to point at:

ListItem_t ListItem;
//---Add these lines
ListItem next;
ListItem.pstNextListItem = &next;
//---
ListItem_t *stoNext;
stoNext = ListItem.pstNextListItem;

依此类推，要使用SerialNumber字段，您将需要为其分配一些东西，依此类推...

And so forth, to use the SerialNumber field, you will need to assign something to that, and so on...

首先，在其中初始化ListItem.pstNextListItem的地方?您尝试用ListItem.pstNextListItem初始化stoNext，而ListItem.pstNextListItem本身从未被初始化.也许您做到了，但没有显示代码行?

其次，应将str_ID声明为char* str_ID.

—SA

First, where ListItem.pstNextListItem is initialized? You try to initialize stoNext by ListItem.pstNextListItem which itself is never initialized. Maybe you did it but did not show the code line?

Secondly, str_ID should be declared char* str_ID.

—SA

确保*str_ID有足够的内存，以便可以容纳字符串.

之后，您可以使用

Make sure *str_ID have enough memory so that it can hold the string.

After that you can use

memset(str_ID,0x00,256)

或类似的方法.

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