MarkDuplicates.cpp : Defines the entry point for the application.
MarkDuplicates scans a user specified directory, gathering filenames, write times, and sizes, along with the generated SHA-1 message digest. This information is put into a class (a list of nodes). It is sorted by message digest and then by file name. The result is that identical files are grouped together. Duplicates are flagged and made available for marking, which renames the files as "base.DELETE.ext". The user can then look at the directory with explorer and select all of the marked files for deletion. This solves the problem created when a new laptop was acquired and OneDrive was accidentally told to upload multiple, duplicate copies of the files. The user can override the duplicate status of each file with X (for duplicate) and O (for non duplicate). While looking at the list of files, the user can examine a file by pressing Enter, Space or double clicking, using a Shell Open process.
In addition to this marking, the user can initiate a test sequence which tests the SHA-1 implementation with the four tests described in RFC-3174, along with a fifth test of my own, a large PDF file.
The user can change the font and color of the display, and that will be saved to the registry. Initially, the columns of the display do not line up, but changing to a fixed pitch font, such as Courier will fix that. I like Courier Bold 12 Green best.
Saves and restores the window placement in the registry at HKCU/Software/Alex Sokolek/Mark Duplicates/1.0.0.7/WindowPlacement.
Provision is made for saving and restoring the current node list, along with the sort mode and scroll position and the selected file so that review (which can be lengthy) can continue later.
Demonstrates using a class to wrap a set of C functions implementing the SHA-1 Secure Message Digest algorithm described in RFC-3174.
Uses a thread pool of 12 threads to process the hashes.The machine used for development and testing has 12 logical processors, hence the choice of 12 threads.This will still work on a machine that has fewer processors - It will just be slower - To take advantage of a machine with more processors, see line 103, "int Threads = 12", or adjust the threads with .
It is suggested that a backup copy of the directory in question be made, in case something goes wrong.
Norton 360 balks when Mark is performed. Apparently, renaming a lot of files is considiered suspicious behavior. Make sure that the executable is on the Excluded List. (I put the entire VS directory source tree on the Excluded List.)
Compilation requires that UNICODE be defined. Some of the choices made in code, mainly wstring, do not support detecting UNICODE vs non-UNICODE, so don't compile without UNICODE defined.
In case you get linker errors, be sure to include version.lib in the linker input line.
Microsoft Visual Studio 2022 Community Edition 64 Bit 17.9.6
Alex Sokolek, Version 1.0.0.1, Copyright (c) March 29, 2024
Version 1.0.0.2, April 10, 2024, Corrected PeekMessage() error.
Version 1.0.0.3, April 24, 2024, Updated version for release.
Version 1.0.0.4, May 14, 2024, Fixed saving/loading of selected directory.
Version 1.0.0.5, May 19, 2024, Added support for a thread pool.
Version 1.0.0.6, May 21, 2024, Updated version for release. Comment changes only.
Version 1.0.0.7, May 25, 2024, Added elapsed time status and adjustable threads.
Version 1.0.0.8, May 25, 2024, Added volatile attribute to thread critical identifiers.