• 0

[DELPHI] Invalid Parameter


Question

Gentlemen,

I'm trying to copy one TClientDataSet into another TClientDataset using a TDataSetProvider

constructor TDataSetIteratorItem.Create(aName: String; aDataSet: TDataSet);
var
  TempProvider : TDataSetProvider;
  Bookmark : TBookmark;
begin

  FName := aName;
  FDataSet := TClientDataSet.Create(nil);

  // Copy the dataset in the clientdataset
  TempProvider := TDataSetProvider.Create(nil);
  aDataSet.DisableControls;

  try
    Bookmark := aDataSet.GetBookmark;
    aDataSet.First;
    TempProvider.DataSet := aDataSet;
    FDataSet.Data := TempProvider.Data;

    if assigned ( Bookmark ) and ( aDataSet.BookmarkValid( Bookmark ) ) then
      aDataSet.GotoBookmark(Bookmark);

  finally
    FreeAndNil( TempProvider );
    aDataSet.EnableControls;
  end;
end;

FDataSet.Data := TempProvider.Data; raises a "EDBCLient invalid parameter" error

Does anybody know how to resolve this problem?

Thx in advance.

Link to comment
https://www.neowin.net/forum/topic/286344-delphi-invalid-parameter/
Share on other sites

6 answers to this question

Recommended Posts

  • 0

the API says that Data is readonly and you are trying to assign a value to the property.

FDataSet.Data := TempProvider.Data;

try

FDataSet.DataSet := TempProvider.DataSet;

  Quote

TCustomProvider.Data

Denotes a data packet created by the provider.

property Data: OleVariant;

Description

Data is a read-only property that is provides access to a data packet containing all records. Reading Data calls GetRecords with a parameter of -1.

As implemented in TCustomProvider, GetRecords returns NULL. Descendants of TCustomProvider reimplement the GetRecords method to implement the Data property.

  • 0

Thanks for your reply.

The strange thing about this is that I have a couple more TClientDataSets that work perfectly this way.

Maybe it has something to do with a onchange event? some fields have onchange events.

Maybe the TClientDataSet needs to be in a specific state?

Anybody any clues?

Thx in advance.

  • 0

Hi,

Sorry for my delayed anwser.

I'm working with a DataSetIterator, a Iterator for...well...Datasets.

In the code I posted a DataSetIteratorItem is being created but fails.

Because of the "Invalid parameter" exception.

You see this DataSetIterator is part of our framework so i can't adjust the framework for my problem.

I think it has something to do with the dataset I'm trying to store in this Iterator.

Any clues ?

Thanks in advance.

  • 0

sorry I have know idea how a DataSetIteratorItem works, never used it.

I dont think anybody on neowin is going to be able to help you with this one.

... why would you have a DataSetIterator, when all you need to traverse a dataset is next, first, last, previous which is built into TClientDataSet?

sorry I havent been much help.

  • 0

Hi,

I resolved the problem.

It had something to do with a lookupfield on the clientdataset.

Once I deleted the "corrupt" lookup and added it again, it didn't give the exception.

Altough it is the same lookup with the same keyfield etc.. :cry:

Oh well thanks anyways.

This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Posts

    • Look at the fingers especially round the cups, you’d think A needs to add the I together
    • There are too many people doing nothing and just cruising at MS because of how the previous culture was (rest and vest).
    • AMD Ryzen AM4 16-core 5900XT processor has never been priced cheaper by Sayan Sen While AMD's newest processor platform with DDR5 and PCIe 5.0 goodness is AM5, the preceding Socket AM4 continues to be a great option for gamers shopping on a lower budget. One of the most powerful AM4 desktop chips, the 16-core Ryzen 9 5900XT, is currently priced at the lowest ever at just $230 (purchase links down below). The Ryzen 7 5900XT is based on the Zen 3 architecture supports DDR4, PCIe Gen4, and offers very good performance in both gaming and productivity. While users may not expect the same level of gaming throughput or latency improvement as the 5800X3D, it is certainly possible that titles that utilize more than 16 threads will favor the 5900XT over the 5800X3D. And the 5900XT has plenty of L3 cache as well at 64 MB. So while not 3D stacked V-cache, it should still be a decent gaming chip. And all that cache as well as cores/threads will be excellent for non-gaming tasks of course. The CPU has a base clock of 3.3 GHz and boosts up to 4.8. It has a TDP of 105 watts so the available power envelope certainly helps with that. It can tolerate temperatures of up to 90 °C and there is no boxed cooler with it. So you need an aftermarket one, ideally a 280 mm or 360 mm AIO liquid cooler or an excellent air cooler. Also since this is a 16-core 105-watt chip, make sure to run it on an AM4 board that has good quality VRM and cooling with lots of power (ideally an X570 motherboard). Another consideration is that it does not have integrated graphics so you need a separate dedicated GPU for display out. Get the AMD Ryzen 9 5900XT at the links below: AMD Ryzen 9 5900XT - No Integrated Graphics Desktop CPU Processor - 100-100001581WOF: $229.99 (Amazon US) || : $279.00 (Newegg US + Corsair 32GB DDR4-3200 RAM) This Amazon deal is US-specific and not available in other regions unless specified. If you don't like it or want to look at more options, check out the Amazon US deals page here. Get Prime (SNAP), Prime Video, Audible Plus or Kindle / Music Unlimited. Free for 30 days. As an Amazon Associate, we earn from qualifying purchases.
    • OnlyOffice 9.0.0 by Razvan Serea OnlyOffice Desktop Editors is an open-source office suite distributed under AGPL v.3 that combines text, spreadsheet and presentation editors allowing to create, view and edit documents stored on your computer. The application does not require constant connection to the Internet and allows youto create, edit, save and export text, spreadsheet and presentation documents. It is fully compatible with Office Open XML formats: .docx, .xlsx, .pptx. One pack - five editors - multiple features Create, view and edit text documents, spreadsheets and presentations of any size and complexity. Work on documents of most popular formats: DOCX, ODT, XLSX, PDF, ODS, CSV, PPTX, ODP, etc. Deal with multiple files within one and the same window thanks to the tab-based user interface. Highest compatibility with Microsoft Office formats. Real-time collaboration within your favorite cloud Connect ONLYOFFICE Desktop Editors to the cloud platform of your choice: ONLYOFFICE, Nextcloud or ownCloud to collaborate on documents with your team – co-edit in real time, review, comment and interact using chat. Extending your editing capabilities Take the most of your editing with the collection of third-party plugins. Insert a YouTube video, add special symbols or a ClipArt object, automatically translate any word or sentence, highlight code, etc. Do even more! Create your own plugin using the API documentation and ready-to-use examples available on GitHub. OnlyOffice key features: View, edit, and collaborate on docs, sheets, slides Build fillable PDF forms and fill them in online Read and edit PDFs, export/import to/from PDF Convert docs to Markdown and HTML Turn your textbooks into e-books Generate texts with the AI helper OnlyOffice 9.0 changelog: New features All Editors Redesigned interface of the main application window Added new interface themes: Modern Light and Modern Dark Added saving of the last selected languages in spellcheck lists Added Arabic spellcheck dictionary used in sixteen dialects Added AI-powered macro generation from descriptions and VBA-to-JavaScript conversion Added the interface translation into Urdu (ur-PK, Urdu (Pakistan)) Added support for TextArt text settings inside chart labels Added support for drawing the Up/Down Bars chart elements Merged local and cloud template lists into a unified view The list of templates is now processed on the client side, not on the server The installed system languages are now displayed at the top of the text/document/dictionary list Added a contrast-reducing effect for control buttons in inactive windows Added the option to select a printer in the print preview menu The Print using the system dialog option has been added to the print preview menu The ability to configure format associations for modern Windows OS in the EXE package installation wizard has been unlocked Document Editor Added correct display of previews for paragraph numbers for RTL Improved positioning and settings of TextArt for RTL Improved drawing of borders and fill for paragraphs with RTL direction Enabled accurate cursor navigation with arrow keys based on the paragraph's text direction Added the ability to display numbers using Hindi digits Added a setting in the File menu for selecting the preferred font size: Western/Chinese for the Chinese interface language (Chinese (Simplified)) Added a Borders button to the Home toolbar to quickly set paragraph settings Added support for the MD format for reading Spreadsheet Editor Added support for displaying bidirectional text Added the ability to select external data from another spreadsheet Presentation Editor Added the ability to set the paragraph direction (Text Direction > RTL) on the toolbar and in the advanced settings Added the ability to view animations with text Added the "Preserve" option to the Slide Master context menu Forms Changed the appearance of the Signature and Image fields: the placeholder and signature icon are now always displayed Improved user experience when filling in the Signature and Image fields Added a new "type": "signature" for the Signature field, used in the process of filling out forms PDF Editor Added the ability to set RTL direction for text The Edit Text option is available in the Community Edition build Implemented a PDF form editor Added copying pages between PDF files Diagrams Release of the first version of the Diagram Viewer with the ability to open VSDX files for viewing Convert Added conversion of the XLSB format to the editor's internal format, allowing editing and saving in XLSX without preliminary conversion Download: OnlyOffice 64-bit | 273.0 MB (Open Source) Download: OnlyOffice 32-bit | 252.0 MB Download: Windows XP 64-bit | 467.0 MB Download: Windows XP 32-bit | 457.0 MB View: OnlyOffice Website | Screenshot | Release Notes Get alerted to all of our Software updates on Twitter at @NeowinSoftware
  • Recent Achievements

    • Week One Done
      Wayne Robinson earned a badge
      Week One Done
    • One Month Later
      Karan Khanna earned a badge
      One Month Later
    • Week One Done
      Karan Khanna earned a badge
      Week One Done
    • First Post
      MikeK13 earned a badge
      First Post
    • Week One Done
      OHI Accounting earned a badge
      Week One Done
  • Popular Contributors

    1. 1
      +primortal
      681
    2. 2
      ATLien_0
      273
    3. 3
      Michael Scrip
      206
    4. 4
      +FloatingFatMan
      172
    5. 5
      Steven P.
      143
  • Tell a friend

    Love Neowin? Tell a friend!