为什么无法给指针赋值？

[DeH40]

参照数据结构课本中的尾插法建表（其中temp是在另一个cpp文件中声明的全局变量）

void theList::CreateList(CarData a[],int n){
	CarList * s,*r;
	extern CarList * temp;
	r=temp;
	for(int i=0;i<n;i++)
	{  	
		s=(CarList *)malloc(sizeof(CarList));
		s->data=a[i];		
		temp->next=s;
		temp=s;	
	}
	
	temp->next=NULL;
	return ;
}

在执行到

s->data=a[i];

时报错：
DepotManage.exe 中的 0x0f57ca08 (msvcr100d.dll) 处有未经处理的异常: 0xC0000005: 写入位置 0xcdcdcdcd 时发生访问冲突
在

s->data=a[i];

前加上一句

cout<<a[i].id<<endl;

可以显示其中内容。
请问如何解决，十分感谢！

[lsfv001]

a[i]，是一个类对象。&a[i]看看。

[小乌龟在大乌龟背上]

为什么第一个参数要传指针呢？

[小灸舞]

你使用了未初始化的堆空间 windows里常见的内存填充数据含义 * 0xABABABAB : Used by Microsoft's HeapAlloc() to mark "no man's land" guard bytes after allocated heap memory * 0xABADCAFE : A startup to this value to initialize all free memory to catch errant pointers * 0xBAADF00D : Used by Microsoft's LocalAlloc(LMEM_FIXED) to mark uninitialised allocated heap memory * 0xBADCAB1E : Error Code returned to the Microsoft eVC debugger when connection is severed to the debugger * 0xBEEFCACE : Used by Microsoft .NET as a magic number in resource files * 0xCCCCCCCC : Used by Microsoft's C++ debugging runtime library to mark uninitialised stack memory * 0xCDCDCDCD : Used by Microsoft's C++ debugging runtime library to mark uninitialised heap memory * 0xDEADDEAD : A Microsoft Windows STOP Error code used when the user manually initiates the crash * 0xFDFDFDFD : Used by Microsoft's C++ debugging heap to mark "no man's land" guard bytes before and after allocated heap memory * 0xFEEEFEEE : Used by Microsoft's HeapFree() to mark freed heap memory

[ri_aje]

CarList 怎么定义的？

[www_adintr_com]

0xcdcdcdcd 明显就是未初始化的数据