#include <iostream>
#include <Windows.h>

using std::cout;
using std::endl;

#define FILENAME "gibrish.bin"
HANDLE WINAPI Mutex;

int main(void)
{
	WCHAR param[4];
	LPWSTR pParam = param;
	STARTUPINFO si;
	PROCESS_INFORMATION pi;

	HANDLE hFile;
	HANDLE hMapFile;
	LPSTR pBuf;
	CHAR file_name[] = FILENAME;
	LPCSTR pFileName = file_name;

	SYSTEM_INFO sys_info;
	GetSystemInfo(&sys_info);
	int mem_buffer_size = sys_info.dwAllocationGranularity;

	hFile = CreateFile(
		pFileName, // file name
		(GENERIC_READ | GENERIC_WRITE), // access type
		FILE_SHARE_WRITE, // other processes can share
		NULL, // security
		OPEN_EXISTING, // open only if file exists
		FILE_ATTRIBUTE_NORMAL,
		NULL);

	hMapFile = CreateFileMapping(
		INVALID_HANDLE_VALUE,
		NULL, // default security
		PAGE_READWRITE, // readwrite access
		0, // maximum object size (high-order DWORD)
		mem_buffer_size, // maximum object size (low-order DWORD)
		// 0 means map the whole file
		"mapObj");

	pBuf = (LPSTR)MapViewOfFile(
		hMapFile, // handle to map object
		FILE_MAP_ALL_ACCESS, // read/write permission
		0, // start point (upper word)
		0, // start point (lower word)
		mem_buffer_size); // how many bytes to read


	swprintf_s(param, 4, L" %d", 2);
	ZeroMemory(&si, sizeof(si));
	si.cb = sizeof(si);
	ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));

	if (!CreateProcessA(
		"Process2.exe",
		NULL,
		NULL,
		NULL,
		TRUE,
		0,
		NULL,
		NULL,
		&si,
		&pi))
	{
		std::cerr << GetLastError();
		return 1;
	}

	WaitForSingleObject(pi.hProcess, INFINITE);

	UnmapViewOfFile(pBuf);

	CloseHandle(pi.hProcess);
	CloseHandle(pi.hThread);


	CloseHandle(hMapFile);
	CloseHandle(hFile);

	system("pause");
	return 0;
}

#pragma comment(lib, "user32.lib")
#include <iostream>
#include <Windows.h>

using std::cout;
using std::endl;


int main(void)
{
	HANDLE hMapFile;
	LPSTR pBuf;

	SYSTEM_INFO sys_info;
	GetSystemInfo(&sys_info);
	int mem_buffer_size = sys_info.dwAllocationGranularity;


	hMapFile = OpenFileMapping(
		FILE_MAP_ALL_ACCESS,
		FALSE,
		"mapObj"
	);

	pBuf = (LPSTR)MapViewOfFile(
		hMapFile,
		FILE_MAP_ALL_ACCESS,
		0,
		0,
		mem_buffer_size
	);

	pBuf[0] = 'Z';
	cout << pBuf[0] << endl;

	UnmapViewOfFile(pBuf);
	CloseHandle(hMapFile);
	system("pause");
	return 0;
}