CODEWITHSUNDEEP
c++winapimemoryvirtualalloc
John
John

Reputation: 6268

C++ get the base address of a allocated section

Since I was not clear before I will rewrite my question.

I need to get the absolute base address of a section of memory that was allocated with VirtualAllocEx().

For example, if I allocate 0x20000 bytes and get the address 0x5000000.

I need a method of getting the address 0x5000000 using the value 0x5015000.

VirtualQuery() returns the page address that the value 0x5015000 resides in and not the base address of the allocated section of memory.

So I need a different method to find the base address of any allocated section of memory.

Upvotes: 2

Views: 2142

Answers (1)

DevSolar
DevSolar

Reputation: 70243

Disclaimer: no WinAPI experience here whatsoever.

VirtualQuery() returns the page address that the value 0x5015000 resides in and not the base address of the allocated section of memory.

As far as I understood the docs, VirtualQuery() returns a structure containing multiple pieces of information, including...

BaseAddress

A pointer to the base address of the region of pages.

AllocationBase

A pointer to the base address of a range of pages allocated by the VirtualAlloc function. The page pointed to by the BaseAddress member is contained within this allocation range.

Could it be that you checked only BaseAddress and not AllocationBase? Because the latter sounds exactly like what you're looking for...

Upvotes: 3

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