Allocate executable memory by creating a memory section with CreateFileMapping and MapViewOfFile

alloc-executable-memory.cpp

#include <windows.h>
#include <cinttypes>

int main()
{
  static uint8_t code[] = {
    0x90, // nop
    0x90, // nop
    0xc3  // ret
  };
  static const size_t code_size = sizeof(code);

  // للتأكد فقط for debugging
  if (IsDebuggerPresent())
  {
    code[0] = 0xcc; // int 3
  }

  HANDLE section = CreateFileMappingW(INVALID_HANDLE_VALUE, nullptr, PAGE_EXECUTE_READWRITE, 0, code_size, nullptr);
  void *p = MapViewOfFile(section, FILE_MAP_ALL_ACCESS | FILE_MAP_EXECUTE, 0, 0, 0);
  memcpy(p, code, code_size);
  reinterpret_cast<void (*)()>(p)();
  UnmapViewOfFile(p);
  CloseHandle(section);
}