bool CDatum::CreateFromFile (const CString &sFilespec, ESerializationFormats iFormat, CDatum *retdDatum, CString *retsError)
// CreateFromFile
//
// Loads a datum from a file.
{
// Open the file
CFileBuffer theFile;
if (!theFile.OpenReadOnly(sFilespec))
{
*retsError = strPattern(ERR_CANT_OPEN_FILE, sFilespec);
return false;
}
// If unknown format, see if we can detect the format
if (iFormat == formatUnknown)
{
if (!DetectFileFormat(sFilespec, theFile, &iFormat, retsError))
return false;
// If format unknown, then error.
if (iFormat == formatUnknown)
{
*retsError = strPattern(ERR_UNKNOWN_FORMAT, sFilespec);
return false;
}
}
// Parse it
if (!Deserialize(iFormat, theFile, retdDatum))
{
*retsError = strPattern(ERR_DESERIALIZE_ERROR, sFilespec);
return false;
}
// Done
return true;
}
bool CBlackBox::ReadRecent (const CString &sPath, const CString &sFind, int iLines, TArray<CString> *retLines)
// ReadRecent
//
// Returns the most recent set of lines.
{
// First we make a list of log files at the given path.
TArray<CString> Files;
if (!fileGetFileList(sPath, NULL_STR, CString("*.log"), 0, &Files))
return false;
// Now sort them in reverse chronological order (we can do this because we
// have encoded the date in the name).
Files.Sort(DescendingSort);
// Now loop until we have filled all the lines (or until we run out of log
// files).
int iLogFile = 0;
int iLinesLeft = iLines;
while (iLogFile < Files.GetCount() && iLinesLeft > 0)
{
// Open the log file for read-only
CFileBuffer LogFile;
if (!LogFile.OpenReadOnly(Files[iLogFile]))
return false;
// Parse backwards until we reach the number of lines that we want
// or until we reach the beginning of the file.
char *pBoF = LogFile.GetPointer();
char *pEoF = pBoF + LogFile.GetLength();
char *pStart = pEoF;
while (pStart > pBoF && iLinesLeft > 0)
{
// Remember the end of the line.
char *pLineEnd = pStart;
// Go backwards until we hit a line ending
while (pStart > pBoF && pStart[-1] != '\n')
pStart--;
// We're at the beginning of the line so get the whole thing. If
// this is a line that we want, then add it to the result.
CString sLine(pStart, (int)(pLineEnd - pStart));
if (!sLine.IsEmpty()
&& (sFind.IsEmpty() || strFind(sLine, sFind) != -1))
{
// We add at the beginning because we are reading backwards
retLines->Insert(sLine, 0);
// We got a line
iLinesLeft--;
}
// Now move backwards to skip the line ending
if (pStart > pBoF && pStart[-1] == '\n')
pStart--;
if (pStart > pBoF && pStart[-1] == '\r')
pStart--;
}
// Next file
LogFile.Close();
iLogFile++;
}
// Done
return true;
}
