memorymap.cpp

内存映射

// MemoryMap.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <iostream.h>
BOOL FileReplay(char* pszPathName);

static char filepath[]="random.txt1"; 

int main(int argc, char* argv[])
{
	char modulepath[MAX_PATH];
	GetModuleFileName(NULL,modulepath,MAX_PATH);//初始化地址//
	char *pdest = strrchr(modulepath,'\\');
	strncpy(pdest+1,filepath,sizeof(filepath));	

	cout<<"Start check the resulr :s/S"<<endl;
	char s;	
	do
	{
		cin>>s;
	}while( s!='s'&& s!='S');
	FileReplay(modulepath);	


//退出
	cout<<"Exit :x/X "<<endl;
	char x;	
	do
	{
		cin>>x;
	}while( x!='x'&& x!='X');
	return 0;
}

BOOL FileReplay(char* pszPathName)
{
	HANDLE hFile = CreateFile(pszPathName,GENERIC_WRITE|GENERIC_READ,0,NULL
		,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
	if(hFile == INVALID_HANDLE_VALUE)
	{
		printf("File could not be opened.");
		return FALSE;
	}
	
	DWORD dwFileSize = GetFileSize(hFile,NULL);
	
	HANDLE hFileMap = CreateFileMapping(hFile,NULL,PAGE_READWRITE,0,
		dwFileSize,NULL);
	
	if(hFileMap == NULL){
		CloseHandle(hFile);
		return FALSE;
	}
	
	int *pIntFile = (int *)MapViewOfFile(hFileMap,FILE_MAP_WRITE,0,0,0);
	
	if(pIntFile == NULL){
		CloseHandle(hFileMap);
		CloseHandle(hFile);
		return FALSE;
	}
	int max = 0;
	for(int i(0); i < dwFileSize/sizeof(UINT) ; i++)
	{		
		if (pIntFile[i] >= max)
		{
			max = pIntFile[i];
			cout<<pIntFile[i]<<" ";
		}
		else
		{
			cout<<"failed"<<endl;
			break;
		}		
	}
//	pIntFile[i] = 0;
	
	UnmapViewOfFile(pIntFile);
	CloseHandle(hFileMap);
	
	SetFilePointer(hFile,dwFileSize,NULL,FILE_BEGIN);
	SetEndOfFile(hFile);//实际上不需要写入了。
	CloseHandle(hFile);	
	return TRUE;
}