I have a thread that uses ReadDirectoryChangesW
to notify me when a file is added or deleted in a folder.
For each new image, I open the file and create a thumbnail of the image. It would seem however that I receive the notification before the file is completely copied to the destination folder, in which case I only get a partial thumbnail. (Files are copied from remote locations onto a central server and the network can get slow in peak times.)
I do check if the file is in use, but this does not seem to work with image files.
HFileRes := CreateFile(pchar(Filename), GENERIC_READ or GENERIC_WRITE, 0, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0) ;
Result := (HFileRes = INVALID_HANDLE_VALUE);
if (not Result) then
CloseHandle(HFileRes) ;
My question is this: Is there a way to detect when a file is completely copied or do I just wait until the file size or last modification time has not changed since the last time I checked?
To be sure if file transfer is finished check first if you can get exclusive access.
FileHandle := FileOpen(FileName, fmOpenRead or fmShareExclusive);
if FileHandle > 0 then
{valid file handle}
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