#include
#include?“stdafx.h“

#ifdef?_DEBUG
#define?new?DEBUG_NEW
#undef?THIS_FILE
static?char?THIS_FILE[]?=?__FILE__;
#endif
DWORD?BufferSize=1024;
char?buf[1024];

CWinApp?theApp;
using?namespace?std;

//函數聲明
void?FileReadWrite_NoBuffer（char*?sourcechar*?destination）;//無緩沖方式實現文件讀寫
void?FileReadWrite_FastBuffer（char*?sourcechar*?destination）;//高速緩存方式實現文件讀寫
void?FileReadWrite_Asyn（char*?sourcechar*?destination）;//異步方式實現文件讀寫

int?_tmain（int?argc?TCHAR*?argv[]?TCHAR*?envp[]）
{
	int?nRetCode?=?0;
????DWORD?ticktick_s;
	DWORD?nobuffer_start_timesequential_start_timeoverlapped_start_time;
	DWORD?nobuffer_end_timesequential_end_timeoverlapped_end_time;
	DWORD?nobuffer_average_time=0;
	DWORD?sequential_average_time=0;
	DWORD?overlapped_average_time=0;

	printf（“無緩沖方式運行中...\n“）;
	nobuffer_start_time=GetTickCount（）;
	for?（int?i=0;i<10;i++）
	{
		tick=GetTickCount（）;
		FileReadWrite_NoBuffer（“source.txt““1_nobuffer.txt“）;
		printf（“無緩沖方式:?%d?%d?ms\n“iGetTickCount（）-tick）;
	}
	nobuffer_end_time=GetTickCount（）;

	printf（“\n高速緩存方式運行中...\n“）;
????sequential_start_time=GetTickCount（）;
	for?（i=0;i<10;i++）
	{
		tick_s=GetTickCount（）;
		FileReadWrite_FastBuffer（“source.txt““2_FastBuffer.txt“）;
		printf（“高速緩存方式:?%d?%d?ms\n“iGetTickCount（）-tick_s）;
	}
	sequential_end_time=GetTickCount（）;

	printf（“\n異步方式運行中...\n“）;
	overlapped_start_time=GetTickCount（）;
	for?（i=0;i<10;i++）
	{
		tick=GetTickCount（）;
		FileReadWrite_Asyn（“source.txt““3_Asyn.txt“）;
		printf（“異步方式:?%d?%d?ms\n“iGetTickCount（）-tick）;
	}
	overlapped_end_time=GetTickCount（）;
	printf（“\n“）;
	printf（“\n最終結果：\n“）;
	printf（“1.無緩沖方式實現文件讀寫:?%d?ms\n“（nobuffer_end_time-nobuffer_start_time）/10）;
	printf（“2.高速緩存方式實現文件讀寫:?%d?ms\n“（sequential_end_time-sequential_start_time）/10）;
	printf（“3.異步方式實現文件讀寫:?%d?ms\n“（overlapped_end_time-overlapped_start_time）/10）;

	return?nRetCode;
}

//無緩沖方式實現文件讀寫
void?FileReadWrite_NoBuffer（char*?sourcechar*?destination）{
	HANDLE?handle_srchandle_dst;
	DWORD?NumberOfByteReadNumberOfByteWrite;
	BOOL?cycle;
	char?*buffer;
	buffer=buf;
	handle_src=CreateFile（sourceGENERIC_READ0NULLOPEN_ALWAYSFILE_FLAG_NO_BUFFERINGNULL）;
	handle_dst=CreateFile（destinationGENERIC_WRITENULLNULLCREATE_ALWAYSNULLNULL）;
	if（handle_src==INVALID_HANDLE_VALUE||handle_dst==INVALID_HANDLE_VALUE）{
		printf（“File?Create?Fail!\n“）;
		exit（1）;
	}
	cycle=TRUE;
	while（cycle）{
		NumberOfByteRead=BufferSize;
		if（!ReadFile（handle_srcbufferNumberOfByteRead&NumberOfByteReadNULL））{
			printf（“Read?File?Error!%d\n“GetLastError（））;
			exit（1）;
		}
		if（Numb