MapViewOfFile прочитать строки файла

SYSTEM_INFO sinf;
GetSystemInfo(&sinf);
HANDLE hFile = CreateFileA("file.txt", GENERIC_READ,
FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if(hFile==INVALID_HANDLE_VALUE){
    printf("Error open file: %d",GetLastError());
    exit(-1);
}
HANDLE hFileMapping = CreateFileMapping(hFile, NULL,
PAGE_WRITECOPY, 0, 0, NULL);
DWORD dwFileSizeHigh;
__int64 qwFileSize = GetFileSize(hFile, &dwFileSizeHigh);
qwFileSize += (((__int64) dwFileSizeHigh) << 32);
CloseHandle(hFile);
 
int PosRet=0;
__int64 qwFileOffset = 0;
while (qwFileSize > 0) {
DWORD dwBytesInBlock = sinf.dwAllocationGranularity;
if (qwFileSize < sinf.dwAllocationGranularity)dwBytesInBlock =(DWORD)qwFileSize;
PBYTE pbFile = (PBYTE) MapViewOfFile(hFileMapping,  FILE_MAP_COPY,
(DWORD) ((qwFileOffset) >> 32),
(DWORD) (qwFileOffset & 0xFFFFFFFF),
dwBytesInBlock);
if(!pbFile){printf("Error Map:%d",GetLastError());break;}
 
PBYTE Line=pbFile;
for (DWORD dwByte = 0; dwByte < dwBytesInBlock; dwByte++) {
if(pbFile[dwByte]=='\n'){
    pbFile[dwByte]=0x00;
    printf("\r\n(%s)\r\n",Line);
 
    PosRet=dwByte+1;
    Line=&pbFile[PosRet];
}
}
 
printf("\r\n::<%d>::\r\n",PosRet);
 
UnmapViewOfFile(pbFile);
qwFileOffset += dwBytesInBlock;//как увеличить смещение файла в зависимости PosRet?
qwFileSize -= dwBytesInBlock;//уменьшить размер на прочитаный блок
}
CloseHandle(hFileMapping);