Delphi 7 LDAP via ADO / Field type

Posted on 2015-01-21
Last Modified: 2015-01-30
Hi all,
this is a question for legacy Delphi - I have to use D7 for this small project. I need to use some values from LDAP records, so I'm using a SQL query in a 'TBetterADODataSet' to retrieve my data. Later on, I want to display it in a grid and use some of those data in a report. But I don't have a plan how to use fields being obviously strings, but are inserted as TVariantField. This is the case for 'description', which holds the additional text information for a person in our AD.
When I'm adding that field to my SQL command and trying to insert it into my field list, it always inserts as 'TVariantField'. My grid can't use that field type.

Any ideas or workarounds? Sorry - I'm no longer doing my daily D7 programming for some years now, so there's some lack in experience :(

Question by:mkmko
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
  • 2
LVL 24

Expert Comment

ID: 40568891
If it contains String then Typecasting to string should do.

I suspect you can deal with similarly to when trying to show Memo fields in a DBGrid.

Can you test if "ShowMessage(urDataSet.FieldByName('description').AsString);", in a Button Click, gets you the data?

Author Comment

ID: 40574614
Sorry for the delay... no, unfortunately this doesn't work. I have to translate the exception message because of my german Delphi installation: 'Error variant of type (array variant) couldn't be converted into type (string)'.

I checked that the ShowMessage is used and placed correctly by testing FieldByName('anotherStringField').AsString. This  will work.

LVL 24

Accepted Solution

jimyX earned 500 total points
ID: 40574701
Hi Michael,
That clears things out. If the problem is about Variant Array, then we should deal with it as so.

function GetVarArrayString(v: Variant): String;
  i: integer;
  if VarIsArray(v) then
      Result:= '';
      for i:= VarArrayLowBound(v, 1) to VarArrayHighBound(v, 1) do
          Result:= Result+ VarToStr(v[i])+#13;
  else showmessage('It is not an array.'); // Result:= VarToStr(v);
// call it as follows:

Open in new window


Author Comment

ID: 40579671
Yes, this works! Great!
Thanks a lot.


Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering 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
Eclipse Java import and method not resolved 4 131
Hive vs Impla in Hadoop 1 149
Broadcast a message using ICS 2 50
TAction.OnAfterExecute? 2 31
This article is meant to give a basic understanding of how to use R Sweave as a way to merge LaTeX and R code seamlessly into one presentable document.
Since upgrading to Office 2013 or higher installing the Smart Indenter addin will fail. This article will explain how to install it so it will work regardless of the Office version installed.
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

734 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