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Tools for Windows DLL

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Several tools are available to help you troubleshoot DLL problems. The following tools are some of these tools.

Dependency Walker

The Dependency Walker tool ( depends.exe ) can recursively scan for all dependent DLLs that are used by a program. When you open a program in Dependency Walker, Dependency Walker performs the following checks:

  • Dependency Walker checks for missing DLLs.
  • Dependency Walker checks for program files or DLLs that are not valid.
  • Dependency Walker checks that import functions and export functions match.
  • Dependency Walker checks for circular dependency errors.
  • Dependency Walker checks for modules that are not valid because the modules are for a different operating system.

By using Dependency Walker, you can document all the DLLs that a program uses. This may help prevent and correct DLL problems that may occur in the future. Dependency Walker is located in the following directory when you install Microsoft Visual Studio 6.0:

drive\Program Files\Microsoft Visual Studio\Common\Tools

DLL Universal Problem Solver

The DLL Universal Problem Solver (DUPS) tool is used to audit, compare, document, and display DLL information. The following list describes the utilities that make up the DUPS tool:

  • Dlister.exe
    This utility enumerates all the DLLs on the computer and logs the information to a text file or to a database file.
  • Dcomp.exe
    This utility compares the DLLs that are listed in two text files and produces a third text file that contains the differences.
  • Dtxt2DB.exe
    This utility loads the text files that are created by using the Dlister.exe utility and the Dcomp.exe utility into the dllHell database.
  • DlgDtxt2DB.exe
    This utility provides a graphical user interface (GUI) version of the Dtxt2DB.exe utility.



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