bool CFile::Open(LPCTSTR lpszFileName, ULONG nOpenFlags)
{
if (!Close())
{
return false;
}
if (lpszFileName == NULL || _tcslen(lpszFileName) == 0)
{
return false;
}
m_bCloseOnDelete = true;
m_hFile = INVALID_HANDLE_VALUE;
ULONG dwAccess = 0;
switch (nOpenFlags & 3)
{
case modeRead:
dwAccess = GENERIC_READ;
break;
case modeWrite:
dwAccess = GENERIC_WRITE;
break;
case modeReadWrite:
dwAccess = GENERIC_READ|GENERIC_WRITE;
break;
default:
ATLASSERT(false);
}
COSVersion osver;
WORD ostype = osver.GetOSType();
BOOL is_NT =((ostype & OS_WINNT) != 0);
// map share mode
ULONG dwShareMode = 0;
dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
if ((nOpenFlags & shareDenyWrite) == shareDenyWrite) { dwShareMode &= ~FILE_SHARE_WRITE; }
if ((nOpenFlags & shareDenyRead) == shareDenyRead) { dwShareMode &= ~FILE_SHARE_READ; }
if ((nOpenFlags & shareExclusive) == shareExclusive) { dwShareMode = 0; }
// map modeNoInherit flag
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = (nOpenFlags & modeNoInherit) == 0;
// map creation flags
ULONG dwCreateFlag = 0;
if (nOpenFlags & modeCreate)
{
if (nOpenFlags & modeNoTruncate)
dwCreateFlag = OPEN_ALWAYS;
else
dwCreateFlag = CREATE_ALWAYS;
}
else
dwCreateFlag = OPEN_EXISTING;
// attempt file creation
HANDLE hFile = ::CreateFile(lpszFileName, dwAccess, dwShareMode, is_NT ? &sa : NULL,
dwCreateFlag, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
{ //#define ERROR_PATH_NOT_FOUND 3L
//ULONG err = GetLastError();
return false;
}
m_hFile = hFile;
m_bCloseOnDelete = TRUE;
return TRUE;
}
