正在阅读：使用内存映射文件来提高你程序的性能使用内存映射文件来提高你程序的性能

BOOL FileReverseNoMap(PCTSTR 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);
//CloseHandle(hFile);
char *readBuf = new char[dwFileSize+1];
DWORD nRead = 0,nRet =0;
while(nRead<dwFileSize){
if(ReadFile(hFile,readBuf+nRead,dwFileSize-nRead,&nRet,NULL) ==TRUE)
{
nRead+= nRet;
}
else
{
printf("Can read the file!");
CloseHandle(hFile);
}
}

PSTR pchAnsi = (PSTR)readBuf;
pchAnsi[dwFileSize/sizeof(char)]=0;
_strrev(pchAnsi);

pchAnsi = strchr(pchAnsi,'\n');
while(pchAnsi != NULL){
*pchAnsi++ ='\r';
*pchAnsi++ ='\n';
pchAnsi = strchr(pchAnsi,'\n');
}
CloseHandle(hFile);
DeleteFile(pszPathName);

HANDLE hWriteFile = CreateFile(pszPathName,GENERIC_WRITE|GENERIC_READ,0,NULL
,CREATE_NEW,FILE_ATTRIBUTE_NORMAL,NULL);
WriteFile(hWriteFile,readBuf,dwFileSize,&nRet,NULL);
CloseHandle(hWriteFile);

delete readBuf;

return TRUE;
}