[ferget]

так попробуйте

Код:

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

using namespace std;

int main()
{
	HANDLE hAppend;
	DWORD  dwBytesRead=10, dwBytesWritten=10, dwPos=0;

	hAppend = CreateFile(TEXT("inp.txt"), 
		GENERIC_WRITE,         
		FILE_SHARE_READ,          
		NULL,                     
		OPEN_ALWAYS,              
		FILE_ATTRIBUTE_NORMAL,    
		NULL);                    

	if (hAppend == INVALID_HANDLE_VALUE)
	{
		printf("Could not open inp.txt.");
		return 0;
	}

	LockFile(hAppend, dwPos, 0, dwBytesRead, 0);

	int k=0;
	while(k!=1)
	{
		cin>>k;
	}

	UnlockFile(hAppend, dwPos, 0, dwBytesRead, 0);
	return 0;
}