Solved

RegQueryValueEx( ) fails on NT, works on Win95?

Posted on 1997-05-16
3
558 Views
Last Modified: 2013-12-03
I have Registry-reading code that works fine on Win95, and fails on NT4; here's a snippet:HKEY hKey(NULL);DWORD dwDisp(0L);// First open the key (if it's there).if (ERROR_SUCCESS == ::RegOpenKeyEx(  HKEY_CURRENT_USER,  "Software\\MyCompany\\MyApp\\CustomerColWidths",  0L,  KEY_READ,  &hKey)) {   // If key there, open columns until you run out.   LONG lnReturn(ERROR_SUCCESS);   for (int nCol = 0; ERROR_SUCCESS == lnReturn; nCol++) {      CString sValueName;      sValueName.Format("Column%d", nCol);      DWORD dwReserved(0L);      DWORD dwType(0L);      DWORD dwData(0L);      DWORD dwDataSize(sizeof(DWORD));      BYTE* pData = reinterpret_cast<BYTE*> (&dwData);                              if (ERROR_SUCCESS == (lnReturn = ::RegQueryValueEx(        hKey,        sValueName,        &dwReserved,        &dwType,        pData,        &dwDataSize))) {                                       VERIFY(SetColumnWidth(nCol, dwData));      }      else {         // Be sure it failed because this column wasn't found in Registry.         ASSERT(ERROR_FILE_NOT_FOUND == lnReturn);      }   }   VERIFY(ERROR_SUCCESS == ::RegCloseKey(hKey));   hKey = NULL;}  On NT4, RegQueryValueEx( ) returns 87L (an illegal parameter) every time it executes.  The identical code runs fine on Win95.  The funny part is that this is *reading* a key, and it fails - *writing* a key, using ::RegSetValueEx( ), works fine on both systems.Any ideas?
0
Comment
Question by:laleonard
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 

Author Comment

by:laleonard
ID: 1397390
Edited text of question
0
 
LVL 1

Accepted Solution

by:
ete earned 50 total points
ID: 1397391
The LPDWORD lpReserved parameter must explicitly be NULL.

if (ERROR_SUCCESS == (lnReturn =
::RegQueryValueEx(
hKey,
sValueName,
NULL,
&dwType,
pData,
&dwDataSize)))

This should solve your problem

Best regards
ETE
0
 

Author Comment

by:laleonard
ID: 1397392
Well, duh!!  Thanks (grinning sheepishly)...
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Event ID 10010 3 77
mixing C++ & C# in Vis Studio 2013 7 237
Best way to accomplish this task? 3 93
Please explain the parts of these 2 LINQ expressions 3 85
This article describes how to programmatically preset the "Pages per Sheet" option that's available with most printer drivers.   This setting lets you do "n-Up" printing, where two, four, or more pages are printed on each sheet of paper. If your …
For a while now I'v been searching for a circular progress control, much like the one you get when first starting your Silverlight application. I found a couple that were written in WPF and there were a few written in Silverlight, but all appeared o…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question