All bosses:

Recently met a problem, when developing a DLL, in which the malloc () the memory, but when access the access violation, want to consult everybody bosses may be the reasons for this?

 DLLEXT long AMI_Init (void * * AMI_dll_memory) 
{
Mem=(struct model_memory *) malloc (sizeof (struct model_memory)); 
Mem - & gt; Submem=(struct submem *) malloc (sizeof (struct submem)); 
. 
* AMI_dll_memory=(void *) mem; 
} 

DLLEXT long AMI_Get (void * AMI_dll_memory) 
{
. 
AMI_dll_memory mem=(struct model_memory *); 
Mem - & gt; Submem - & gt; init(); 
} 

//Defined in submem module 
Struct {
The int data; 
Struct list * next; 
} the list; 

Void init () 
{
Struct list * n. 
N=(struct list *) malloc (sizeof (struct list)); 
//access n - & gt; The data under caused the memory access violation. 
} 

DLL will be other programs call, the first is to call AMI_Init () to initialize the part of memory, and memory of the first address AMI_dll_memory passed to the parameters, and then invokes the AMI_Get (), then I'm AMI_Get () in the init () function on the malloc (), a new node direct access violation, but here I don't understand is why, want to consult everybody who is this why? I'm sure this list n nodes malloc () is successful, but when I try to access, access violation, very thank you for your comment,

CodePudding user response:

Debugging, whether n is empty?

CodePudding user response:

C the Run - Time Libraries https://msdn.microsoft.com/en-us/library/abx4dbyh.aspx

CodePudding user response:

reference 1/f, the truth is more important than right or wrong response:

debugging, judge whether n is empty?

thank you, n is not empty, allocate a success, but don't have access to,

CodePudding user response:

refer to the second floor 4 teacher zhao response:

C Run - Time Libraries https://msdn.microsoft.com/en-us/library/abx4dbyh.aspx

thank you for reply, but I feel I had this problem and CRT too big relationship, because I'm in the DLL AMI_init () function also malloc () memory, can normal visit, but in AMI_Get () function of malloc () is not line,