Home/ Questions/Q 7800645
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-02T00:42:14+00:00

I worte the code below void * ptr1 = VirtualAlloc((void*)0x70000000, 32*1024*1024, MEM_RESERVE, PAGE_READWRITE); void

  • 0

I worte the code below

 void * ptr1 = VirtualAlloc((void*)0x70000000, 32*1024*1024, MEM_RESERVE, PAGE_READWRITE);
 void * ptr2 = VirtualAlloc((void*)0x80000000, 4*1024*1024, MEM_RESERVE, PAGE_READWRITE);

But VirtualAlloc fails and the value of ptr1,ptr2 are always NULL.
I want to use the adress 0x70000000,0x80000000.
Does anyone know how I can use these adress ?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    This part of the memory is not accessible for usermode applications. From the following MSDN page:

    User applications cannot call VirtualAlloc with shared heap address
    range (0x70000000 to 0x7fffffff) because this is read-only for user
    applications and read/write for kernel mode.

    • 0