C/C++ strcpy unhandled read violation

unsigned char* Data::getAddress(unsigned char* address)
 {
     strcpy((char*)address, (char*)this->_address);
     return (unsigned char*)address;
 }
 
 int main()
 {
     Data d;
     d.makealinkedlisthere();
     while (d)
     {
        unsigned char address[256];
        printf("0x%08x \r\n",d.getAddress(address));
        d = d.getNext();
     }
     return 0;
 }
 

It returns the first two (which is the same, and it should be different [can tell from the debugger]...) then crashes out.

It just makes a linked list. protected member Data* _next ... a chain of them.

The unsigned char* is from Windows function VirtualQueryEx part of the MEMORY_BASIC_INFORMATION data structure it returns.

this->_address = (unsigned char*)meminfo->BaseAddress; // casted from void*
 

It is void*, but I see it converted to unsigned char* in other's codes. In the debugger I can see it represented as a hex number.

D1: +    _address   0x7ffd5000 <Bad Ptr>    unsigned char * 
 D1->_next:+  _address   0x7f6f0000 "áå•ú`©" unsigned char * 
 D1->_next->_next+    _address   0x7ffb0000 " "  unsigned char *
 

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