🚀 go-pugleaf

Hello everyone,

I've got a slight problem with reading the FileName after the Overlapped Event 
on ReadDirectoryChangesW. With my following code, I'm getting an Access 
Violation error; now I'm not sure what buffersize to use, but this one seems to 
suffice:

Hoping someone can help me out.

Kind regards,
Peter Elbertse


// Set handles:
HANDLE hDir = CreateFile (fInternalDirectory.c_str(), FILE_LIST_DIRECTORY, 
FILE_SHARE_READ|FILE_SHARE_DELETE, NULL, OPEN_EXISTING, 
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL);

// Check if the Dir Handle is OK:
if (hDir != INVALID_HANDLE_VALUE)
{
    // Set vars:
    FILE_NOTIFY_INFORMATION *ChangesBuffer = new FILE_NOTIFY_INFORMATION();

    DWORD BufferLength = 0;
    HANDLE myServiceWatch = CreateEvent(NULL, FALSE, FALSE, NULL);
    DWORD ChangesMaxBuffer = sizeof(FILE_NOTIFY_INFORMATION) + MAX_PATH;

    // Set Overlapped:
    OVERLAPPED Overlapped;
    ZeroMemory(&Overlapped, sizeof(Overlapped));
    Overlapped.hEvent = myServiceWatch;

    // Outer try:
    try
    {
        // fetch and process commands until the connection or thread is 
terminated
        while (!Terminated)
        {
            // Update Notifier Listener:
            ReadDirectoryChangesW( hDir, ChangesBuffer, ChangesMaxBuffer, false, 
FILE_NOTIFY_CHANGE_FILE_NAME, &BufferLength, &Overlapped, NULL);

            // Wait for a signal and than continue
            HANDLE myHanldes[1];
            myHanldes[0] = myServiceSignal; /* For Thread Termination */
            myHanldes[1] = myServiceWatch;
            MsgWaitForMultipleObjects(2, myHanldes, FALSE, INFINITE, 
QS_ALLINPUT);

            if (!Terminated)
            {
                // Init variables:
                DWORD cbOffset = 0;
                DWORD OverlappedLength = 0;
                String ChangedFile = "";

                // Get Overlapped result:
                if ( GetOverlappedResult(hDir, &Overlapped, &OverlappedLength, 
TRUE) )
                    // Do reed info, while there is:
                    do
                    {
                        // Try to read next result and read current Filename:
                        cbOffset = ChangesBuffer->NextEntryOffset;
                        String ChangedFile = 
WideCharLenToString(ChangesBuffer->FileName, ChangesBuffer->FileNameLength);

                        // Update ChangesBuffer:
                        ChangesBuffer = (FILE_NOTIFY_INFORMATION*) 
((LPBYTE)ChangesBuffer + cbOffset);
                    }
                    while (cbOffset != 0);
                }
            }
        }

        // Outer finally
        __finally
        {
            // Cleanup:
            CloseHandle(myServiceWatch);
            delete ChangesBuffer;
        }

    }