About LockVol™ - Version 1.3.2 - September 15, 1992
LockVol is a Control Panel device that can be used to test software handling of locked volumes, local or remote. With the use of System 7 and File Sharing, LockVol may come in handy for those trying to test their software. LockVol displays a popup menu containing all volumes in use by your Mac and allows you to change the status of each volume from unlocked, to having a software or hardware lock. Changes made in the Control Panel are immediate and remain intact until you change them back or re-mount the affected volume. The status of the startup volume is restored after a reboot. All other volume status’ are lost after a reboot.
LockVol works under System 6.0 and 7.0 and has been tested on a Mac Plus, Mac IIsi, Mac IIci, and Mac IIfx. No known problems have been reported other than the ones you can create yourself by locking volumes that weren't originally locked.
•--> WARNING <--•
If you are running System 7.0 and attempt to lock the startup volume while File Sharing is running, a dialog informs you that the ‘Users & Groups Data File’ should be backed up before locking the startup volume. This warning is necessary as the System software does not like the volume this file is on suddenly becoming locked. This file will become damaged so you should make a copy of it before locking the startup volume if File Sharing is running. The Finder may tell you this file has been damaged if you lock the volume while File Sharing is running and having a backup of it will save you alot of time.
LockVol is freeware. Permission is granted by the author for personal or electronic distribution as long as no fees or charges are received for it. LockVol remains the copyright of dEVoN Hubbard.
How to Install it
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Simply drag it into your System Folder if your using 6.0 or before; or put it in your Control Panels folder if your using 7.0 (or for that matter anywhere you want under System 7). If you are using System 7 and are going to be testing extension (INIT) code handling of a locked startup volume it is suggested you put LockVol in your ‘Extensions’ folder and put an alias to it in your ‘Control Panels’ folder. This will ensure LockVol gets run before most extensions due the space preceeding the file name.
Version History
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-1.3.2
1. Corrected a bug that wouldn’t display the popup menu under extreme low-memory conditions.
2. Code size has become smaller yet.
-1.3.1
1. Optimized code and reduced overall size.
2. Popup menu now ignores characters in volume names that could represent a command key equivalant (meta characters). Volume names like ‘SE/30’ would be displayed like ‘SE0’ with a ‘CMD-3’ next to it. This no longer happens.
3. All controls (popup menu, radio buttons) now disable/enable when the cdev window is activate/inactive. (Big deal… nice cosmetics).
- 1.3
1. Copyright notices and resources changed to reflect ownership of LockVol by the author.
-1.2.1
1. Corrected a bug that “sometimes” showed the startup icon even if the ‘Show Startup Icon’ box was not checked in the Control Panel.
-1.2
1. Added a startup icon that represents the startup volume being locked or unlocked.
2. Added a ‘Show Startup Icon’ check box to the Control Panel.
3. Corrected a popup display problem that only occured under system 6.0.x.
-1.1
1. Identical in operation to version 1.0.1 but this version was rebuilt with Think C 5.0 and contains smaller code.
2. The area of the control panel that displayed the About… box has been increased to cover the entire top of the window. Some people didn't know the about was there. Just click.
3. A background mask has been added to the icon behind the word ‘LockVol’ so it will show up better if placed on your desktop.
- 1.0.1
1. Corrected a display problem with the popup menu when ran under System 6. The menu is created at a pre-defined width. Short volume names caused a display error in the popup menu. The pre-defined width was displayed initially then resized (smaller) to the longest volume name. This sometimes left a double image of the popup menu rectangle. Note, that the menu worked fine even though this visual problem existed.
2. Added an arrow cursor to the Control Panel for use under System 6. The Control Panel now has an arrow cursor instead of a cross hair (plus sign) cursor.
- 1.0
1. The logic that detects if File Sharing is on has been changed to detect in a more accurate manner.
2. All versions information has been changed to reflect this as a final release.
- 1.0b6 (Not released to the public)
1. The System 7.0 warning about File Sharing now only appears if File Sharing is running at the time you try to lock the startup volume.
- 1.0b5
1. Added a warning dialog for System 7.0 users who try to lock their startup volume. See information above about System 7 warning.
- 1.0b4
1. The status of the startup volume is saved and restored during startup (by INIT code). Only the startup volume status is maintained. The new INIT code patches nothing, and is only memory resident during INIT time.
- 1.0b3
1. About dialog now centers correctly on non color QuickDraw and non 7.0 systems.
- 1.0b2
1. Corrected a bug in dialog handling that caused the Dialog Manager to write to address zero. This wasn't causing crashes or volume mishaps but could have caused other problems.
2. Also added an About… dialog to the cdev. Triggered by clicking on the LockVol icon in the Control Panel.
