Question

the code is:

 typedef struct _Package 
{
    char* data;
    int dataLen;
}Package;

Package *pack=(Package *)malloc(sizeof(pack));
pack->dataLen = 10;
pack->data = (char *)malloc(10);
strcpy(pack->data,"hellohello");

NSMutableArray *lstPack = [[NSMutableArray alloc] init];
[lstPack addobjec:pack];

when the program goto [lstPack addobject:pack],it cann’t go on.
If you know the reason，please tell me。

Thank you！

Answer 1

You can add to obj-c containters (including NSMutableArray) only obj-c objects. To add a c-structure to array you can wrap it to NSValue object:

[lstPack addObject:[NSValue valueWithPointer:pack]];

Later you access stored value:

Package* pack = (Package*)[[lstPack objectAtIndex:i] pointerValue];

Note also that you possibly have a typo in that line – method name is incorrect.