关于heapfree 堆释放的问题

Question

 p = (LPSTR)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 12);
    //p = "123456789";
    //strcat_s(p,10,"123456789");
    ZeroMemory( p, 12 );
    sprintf_s(p,12,"a:%s","123456789");
    printf("**%s***\n",p); 
    HeapFree(GetProcessHeap(),0,p);

p为全局LPSTR变量
sprintf_s(p,12,"a:%s","123456789"); 这一行12改成1024
heapfree为什么会出错

Answer 1

你前面只分配了12，后面

 sprintf_s(p,12,"a:%s","123456789"); 这一行12改成1024

，会造成溢出。