example/mem_ops/mem_ops.cpp

#include <windows.h>
#include <iostream>

int main() 
{
    // 1. Allocate memory with VirtualAlloc
    SIZE_T size = 0x400; // Allocate 1024 bytes
    void* ptr = VirtualAlloc(nullptr, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);

    if (ptr == nullptr) {
        std::cerr << "Memory allocation failed with error: " << GetLastError() << std::endl;
        return 1;
    }
    std::cout << "Memory allocated at: " << ptr << std::endl;

    // 2. Use the allocated memory (example: write data)
    strcpy_s(static_cast<char*>(ptr), size, "Hello, Virtual Memory!");

    // 3. Change the protection of the allocated memory with VirtualProtect
    DWORD oldProtect;
    if (VirtualProtect(ptr, size, PAGE_READONLY, &oldProtect)) {
        std::cout << "Memory protection changed to read-only." << std::endl;
    } else {
        std::cerr << "Changing memory protection failed with error: " << GetLastError() << std::endl;
    }

    // Accessing memory after changing protection to PAGE_READONLY
    std::cout << "Data in memory: " << static_cast<char*>(ptr) << std::endl;

    // 4. Free the allocated memory with VirtualFree
    if (VirtualFree(ptr, 0, MEM_RELEASE)) {
        std::cout << "Memory freed successfully." << std::endl;
    } else {
        std::cerr << "Memory freeing failed with error: " << GetLastError() << std::endl;
    }
    return 0;
}