virtual_query_eg_1.c

#include <Windows.h>
#include <stdio.h>

int main()
{
	MEMORY_BASIC_INFORMATION info;
	int ret;
	const void *location;
	int *vm = VirtualAlloc(NULL, 8, MEM_COMMIT, PAGE_READONLY);
	printf("Address of memory returned by VirtualAlloc is %lu\n", vm);
	printf("Enter the memory address that you want to query: ");
	scanf("%lu", &location);
	ret = VirtualQuery(location, &info, sizeof(info));
	if (!ret)
	{
		printf("VirtualQuery failed\n");
		printf("The error code for the last error was %d", GetLastError());
		return 1;
	}
	printf("Protection type : ");
	switch (info.AllocationProtect)
	{
		case PAGE_EXECUTE_READ:
			printf("EXECUTE + READ\n");
			break;
		case PAGE_READWRITE:
			printf("READ + WRITE\n");
			break;
		case PAGE_READONLY:
			printf("READ\n");
			break;
		default:
			printf("Unknown\n");
			break;
	}

	printf("Region State : ");
	switch (info.State)
	{
		case MEM_COMMIT:
			printf("Committed");
			break;
		case MEM_FREE:
			printf("Free");
			break;
		case MEM_RESERVE:
			printf("Reserve");
			break;
		default:
			printf("Unknown");
			break;
	}
	return 0;
}