SAMPLE: Use ZAP.EXE to Find Duplicate DLLs and VBXs in VB 3.0 (120074)


The information in this article applies to:

  • Microsoft Visual Basic Standard Edition for Windows 2.0
  • Microsoft Visual Basic Standard Edition for Windows 3.0
  • Microsoft Visual Basic Professional Edition for Windows 2.0
  • Microsoft Visual Basic Professional Edition for Windows 3.0
This article was previously published under Q120074

SUMMARY

It is not uncommon for Windows programs to ship with libraries of routines known as dynamic link libraries (DLLs). As more and more applications ship these types of files, duplicates of files tend to accumulate.

The ZAP.EXE sample program is useful for finding duplicated DLLs and VBXs in a system, which could potentially cause problems. It can search the same places searched by Windows when a VBX or DLL is loaded. The sample code demonstrates several API functions, both in the interface and in the primary algorithms.

MORE INFORMATION

Visual Basic support engineers regularly encounter problems caused by users with more than one copy of a particular DLL or VBX. The ZAP.EXE utility makes what used to be a tedious and time-consuming problem a great deal easier and quicker to solve. The main features of ZAP.EXE are as follows:
  • It can search any combination of the MS-DOS search path, the Windows search path (that is, \WINDOWS and \WINDOWS\SYSTEM), and a recursive search path through the hard disk starting at any directory.
  • It can find DLLs, VBXs, and/or any other file specification.
  • The size, date and time of creation, and (where possible) version number of each file is returned, making analysis simple.
  • You can delete files from within the ZAP.EXE utility by selecting the file in the list box display and pressing the DELETE key or by dragging and dropping the file from the list box into the trash can icon.
  • You can copy or move files by dragging and dropping the file into the diskette icon and then selecting a destination for the file.
The included source code is fully commented. The special features of the code are as follows:
  • Tabbed list box and tabbed text box that use a font other than the system font
  • List box with bound horizontal scroll bar
  • Data structure designed to make sorting of data much quicker
  • Drag-and-drop feature
  • Feature that checks to see whether a DLL or VBX is in use before deleting it.
  • Increased-speed method of getting a directory listing
  • Use of the Windows API to get file version numbers
The following file is available for download from the Microsoft Download Center:

Zap10.exe

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
After downloading Zap10.exe, run it to extract the files it contains. They are as follows: 
Filename  Extension  Description
--------  ---------  ---------------------------------------------
ZAP       EXE        The application itself
ZAP       MAK        The project file
MAIN      FRM        The main form
MAIN      FRX        Binary file associated with MAIN.FRM
ABOUT     FRM        The about box
WAIT      FRM        Form displayed during processing
COPYDEST  FRM        Form for selecting copy/move destination
ADT       BAS        Code module containing the main data structure
                     and the procedure to manipulate it
GLOBAL    BAS        Code module containing global variables, API
                     declarations, and type definitions.
USE       TXT        Instruction on how to use this tool
KB        TXT        This document
Modification Type:MinorLast Reviewed:2/24/2005
Keywords:kbenv KB120074 kbAudDeveloper
©2004 Microsoft Corporation. All rights reserved.