windows - How does one use VirtualAllocEx do make room for a code cave?

Question

How does one use VirtualAllocEx do make room for a code cave? I am currently in possession of a piece of software with very little "free space" and I read that VirtualAllocEx is used for making this space..

Answer 1

#include <stdio.h>
#include <windows.h>
#include <commctrl.h>   

unsigned long pid;
HANDLE process;
GetWindowThreadProcessId(listview, &pid);
process = OpenProcess(PROCESS_VM_OPERATION|PROCESS_VM_READ | PROCESS_VM_WRITE|PROCESS_QUERY_INFORMATION, FALSE, pid);

int *vptr = (int *)VirtualAllocEx(process, NULL, sizeof(int), MEM_COMMIT, PAGE_READWRITE);

References
- MSDN VirtualAllocEx Function
- CodeProject Stealing Program's Memory
- StackOver What is a code cave... ?

HTH,