PRB: Run-time Error 87 Using RegEnumValue Function

 Last reviewed: December 22, 1997
Article ID: Q173009
The information in this article applies to:
  • Microsoft Visual Basic Control Creation, Learning, Professional, and Enterprise Editions for Windows, version 5.0 on the following platform: NT
  • Microsoft Visual Basic Standard, Professional, and Enterprise Editions, 32-bit only, for Windows, version 4.0 on the following platform: NT

SYMPTOMS

When attempting to call the RegEnumValue API from Visual Basic or Visual Basic for Applications code, you may receive the following error: 

   Error 87 - Invalid Parameter
This problem occurs if you are running the Windows NT 4.0 Operating System and you have obtained the declaration for the RegEnumValue API from Visual Basic's API Text Viewer program.

CAUSE

The Declare statement for RegEnumValue in Visual Basic's API Text Viewer is incorrect.

RESOLUTION

The declaration of RegEnumValue as it currently exists in the API Text Viewer is: 

   Declare Function RegEnumValue Lib "advapi32.dll" Alias "RegEnumValueA" _
      (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpValueName As _
      String, lpcbValueName As Long, lpReserved As Long, lpType As Long, _
      lpData As Any, lpcbData As Long) As Long
The fifth parameter, lpReserved, should be defined as ByVal. The correct declaration is: 

   Declare Function RegEnumValue Lib "advapi32.dll" Alias "RegEnumValueA" _
      (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpValueName As _
      String, lpcbValueName As Long, ByVal lpReserved As Long, lpType As _
      Long, lpData As Any, lpcbData As Long) As Long

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

REFERENCES

An updated version of the Win32API.txt file is available for download for registered users of Visual Basic. For more information about downloading this file, please see the following Knowledge Base article: 

   ARTICLE-ID: Q178020
   TITLE     : FILE: WIN32API.EXE: Updated Version of Win32api32.txt File

Keywords          : vb432 VB4WIN vb5all
Version           : WINDOWS:4.0,5.0
Platform          : NT WINDOWS
Issue type        : kbprb

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Last reviewed: December 22, 1997
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