public void StartSync()
{
Exception searchError = null;
try
{
lock (ChildDirectorySearchers)
{
ChildDirectorySearchers = new List <AsyncFileFinder>();
}
Debug.Print("StartSync Called, Searching in " + _SearchDirectory + " For Mask " + _SearchMask);
String sSearch = Path.Combine(_SearchDirectory, "*");
Queue <String> directories = new Queue <string>();
//Task:
//First, Search our folder for matching files and add them to the queue of results.
Debug.Print("Searching for files in folder");
NativeMethods.WIN32_FIND_DATA findData;
IntPtr fHandle = NativeMethods.FindFirstFile(sSearch, out findData);
while (fHandle != IntPtr.Zero)
{
if (_Cancelled)
{
FireAsyncFileFindComplete(AsyncFileFindCompleteEventArgs.CompletionCauseEnum.CompleteCancelled);
return;
}
//if the result is a Directory, add it to the list of result directories if it passes the recursion test.
if ((findData.dwFileAttributes & FileAttributes.Directory) == FileAttributes.Directory)
{
if (findData.Filename != "." && findData.Filename != "..")
{
if (
DirectoryRecursionFilter(new FileSearchResult(findData,
Path.Combine(sSearch, findData.Filename))))
{
Debug.Print("Found Directory:" + findData.Filename + " Adding to Directory Queue.");
directories.Enqueue(findData.Filename);
}
}
}
else if (findData.Filename.Length > 0)
{
//make sure it matches the given mask.
if (FitsMask(findData.Filename, _SearchMask))
{
FileSearchResult fsr = new FileSearchResult(findData,
Path.Combine(_SearchDirectory, findData.Filename));
if (FileFilter(fsr) && !_Cancelled)
{
Debug.Print("Found File " + fsr.FullPath + " Raising Found event.");
FireAsyncFileFound(new AsyncFileFoundEventArgs(fsr));
}
}
}
findData = new NativeMethods.WIN32_FIND_DATA();
if (!NativeMethods.FindNextFile(fHandle, out findData))
{
Debug.Print("FindNextFile returned False, closing handle...");
NativeMethods.FindClose(fHandle);
fHandle = IntPtr.Zero;
}
}
//find all directories in the search folder which also satisfy the Recursion test.
//Construct a new AsyncFileFinder to search within that folder with the same Mask and delegates for each one.
//Allow MaxChildren to run at once. When a running filefinder raises it's complete event, remove it from the List, and start up one of the ones that have not been run.
//if isChild is true, we won't actually multithread this task at all.
Debug.Print("File Search completed. Starting search of " + directories.Count +
" directories found in folder " + _SearchDirectory);
while (directories.Count > 0 || ChildDirectorySearchers.Count > 0)
{
if (_Cancelled)
{
break;
}
while (ChildDirectorySearchers.Count >= MaxChildren)
{
Thread.Sleep(5);
}
//add enough AsyncFileFinders to the ChildDirectorySearchers bag to hit the MaxChildren limit.
if (directories.Count == 0)
{
Debug.Print("No directories left. Waiting for Child Search instances to complete.");
Thread.Sleep(5);
continue;
}
Debug.Print("There are " + ChildDirectorySearchers.Count + " Searchers active. Starting more.");
String startchilddir = directories.Dequeue();
startchilddir = Path.Combine(_SearchDirectory, startchilddir);
AsyncFileFinder ChildSearcher = new AsyncFileFinder(startchilddir, _SearchMask, FileFilter,
DirectoryRecursionFilter, true);
ChildSearcher.AsyncFileFound += (senderchild, foundevent) =>
{
AsyncFileFinder source = senderchild as AsyncFileFinder;
if (!_Cancelled)
{
FireAsyncFileFound(foundevent);
}
};
ChildSearcher.AsyncFileFindComplete += (ob, ev) =>
{
AsyncFileFinder ChildSearch = (AsyncFileFinder)ob;
lock (ChildDirectorySearchers)
{
Debug.Print("Child Searcher " + ChildSearch.SearchDirectory +
" issued a completion event, removing from list.");
ChildDirectorySearchers.Remove(ChildSearch);
}
};
lock (ChildDirectorySearchers)
{
ChildDirectorySearchers.Add(ChildSearcher);
}
if (!isChild)
{
Debug.Print("Starting sub-search asynchronously");
ChildSearcher.Start();
}
else
{
Debug.Print("Starting sub-search synchronously");
ChildSearcher.StartSync();
}
}
Debug.Print("Exited Main Search Loop: Queue:" + directories.Count + " Child Searchers:" +
ChildDirectorySearchers.Count);
}
catch (Exception exx)
{
searchError = exx;
}
_IsSearching = false;
if (searchError != null)
{
FireAsyncSearchError(searchError);
}
var completecause = _Cancelled
? AsyncFileFindCompleteEventArgs.CompletionCauseEnum.CompleteCancelled
: AsyncFileFindCompleteEventArgs.CompletionCauseEnum.CompleteSuccess;
if (searchError != null)
{
completecause = AsyncFileFindCompleteEventArgs.CompletionCauseEnum.CompleteError;
}
FireAsyncFileFindComplete
(completecause);
}
public FileSearchResult(NativeMethods.WIN32_FIND_DATA pFindData, String pFullPath)
{
_FindData = pFindData;
_FullPath = pFullPath;
}