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Lajos Juhász

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  1. Lajos Juhász

    Outdated Delphi Roadmap

    I asked this question in the FB Delphi developer group. Bruce McGee answered a month ago: "It's in the works". I have no idea whenever he has some insider information about it or not. It would be really useful to know when we can expect the hotfix for the compiler error in 10.4.1.
  2. Lajos Juhász

    Organizing enums

    Are you loooking for this http://docs.embarcadero.com/products/rad_studio/delphiAndcpp2009/HelpUpdate2/EN/html/devcommon/compdirsscopedenums_xml.html ? The $SCOPEDENUMS directive enables or disables the use of scoped enumerations in Delphi code. More specifically, $SCOPEDENUMS affects only definitions of new enumerations, and only controls the addition of the enumeration's value symbols to the global scope. In the {$SCOPEDENUMS ON} state, enumerations are scoped, and enum values are not added to the global scope. To specify a member of a scoped enum, you must include the type of the enum. For example: {$SCOPEDENUMS ON} type THTMLType = (htTemplate, htStatic, htHeader, htCustom); vHtmlReportType:=THTMLType.htTemplate; // Ok vHtmlReportType:=htTemplate; // [dcc32 Error] Unit1.pas(35): E2003 Undeclared identifier: 'htStatic'
  3. Lajos Juhász

    TMemo - How to select (highlight) a line of text in code?

    Looks like a bug, but you can do: var x: TCaretPosition; begin x.Line:=5; x.Pos:=1; MyMemo.Model.SelectText(x, 50); (Using Delphi XE5 in that version Selstart and Sellength worked as expected.)
  4. Lajos Juhász

    FireDAC and pooling random error

    I don't know where is this written in the documentation. However, of course this is true only for the first time. Like in BDE,as FD was designed to replace BDE, later when you give the same connectionname it will use the already created connection. There is no reason to create a connection for every single query as it would be inneficient with databases. You can check it simple using code: FDQuery1.ConnectionName:=CONN_DEF_NAME; FDQuery1.Open; FDQuery1.Connection.Name:='Test'; // Just to give a name. FDQuery2.ConnectionName:=CONN_DEF_NAME; FDQuery2.Open; if FDQuery1.connection=fdQuery2.Connection then ShowMessage('FDQuery1 shares the connection with FDQuery2.');
  5. Lajos Juhász

    FireDAC and pooling random error

    This is the documented behavior: http://docs.embarcadero.com/products/rad_studio/firedac/frames.html?frmname=topic&frmfile=Multi_Threading.html. FireDAC is thread-safe, when the following conditions are meat: A connection object and all associated with it objects (like TADQuery, TADTransaction, etc) in each moment of time must be used by a single thread. ADManager must be activated before threads will start by setting ADManager.Active to True. Means, after a thread opened a query, and until its processing is not finished, application cannot use this query and connection objects in an other thread. Or, after a thread started a transaction, and until it is not finished, application cannot use this transaction and connection objects in an other thread. Practically this means an application must serialize access to a connection across all threads, and that is not a convenient technique. Breaking these rules may lead to misbehavior, AV's and errors like the SQL Server error "Connection is busy with results for another command".
  6. It's already possible file - open enter or select the desired dfm (if you enter the filename you must add the .dfm extenstion). The IDE will open the file as text. It will just not focus the invalid lines.
  7. Lajos Juhász

    FireDAC - TFDEventAlerter

    Did anyone else tried to use TDEVentAlerter on Informix? I have installed the DBMS_ALERT and setup everything. When the component tried to register itself the error is: When the Event alerter tries to execute: EXECUTE PROCEDURE DBMS_ALERT_WAITANY(:name, :message, :status, :timeout)", ATimes=0, AOffset=0] The error message is: [FireDAC][Phys][ODBC][Informix][Informix ODBC Driver][Informix]Argument must be a Statement Local Variable or SPL variable or argument for an OUT or INOUT parameter. Delphi 10.4.1 there is on RSP-30452.
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