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  • How to check if TypeIdenitifier(T) is an Object?

    - by John
    I'm creating a generic list class that has a member of type Array(Array of ). The problem is the class descruction,because the class is supposed to be used for types from byte to types inheriting TObject. Specifically: destructor Destroy; var elem:T; begin /*if(T is Tobject) then //Check if T inherits TObject {Compiler error!} for elem in FData do TObject(elem).Free;*/ // do not know how to do it SetLength(FItems,0); //FItems : Array of T inherited Destroy; end; How do I check if T is TObject so I can free every member if the typeidenitifier is a class,for example?

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  • Array with multiple types?

    - by aleluja
    Hello, I was wondering if there is a way to make an array which would have multiple types of data fields. So far I was using aMyArray: array of array [0..1] of TPoint; But now, it is not enough for me. I need to add 3 more elements to the existing 2 "Point" elements making it an array like aMyArray: array of (TPoint,TPoint,real,real,real) So each element of aMyArray would have 5 'children', 2 of which are of a TPoint type and 3 of them are 'real' type. Is this possible to implement somehow?

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  • XCP vm created via xl create doesn't show up in Xencenter neither in xe vm-list

    - by user138664
    i am running XCP 1.4.90.530.170661 and i have many PV guests running and created via XenCenter. I have created now an openwrt PV guest via the xl create command but it doesn't show up in Xencenter neither in the vm-list command: xe vm-list uuid ( RO) : 6d29aac1-67ff-f83e-4dbc-894a3b6b9c10 name-label ( RW): slitaz power-state ( RO): running uuid ( RO) : 07d96dd1-8223-cd1c-587d-ae37e48d267b name-label ( RW): xen-centos6 power-state ( RO): running uuid ( RO) : 3164bcf1-e43c-badb-e0cf-5423751fffb9 name-label ( RW): xenwin7 power-state ( RO): running uuid ( RO) : 8a31725e-4bcb-48ac-ba7b-e7c1ba310789 name-label ( RW): Control domain on host: xen-mini power-state ( RO): running xl list Name ID Mem VCPUs State Time(s) Domain-0 0 300 2 r----- 4862.5 xenwin7 2 766 1 -b---- 4933.1 slitaz 10 255 1 -b---- 30.8 xen-centos6 11 767 1 -b---- 46.9 openwrt 12 32 1 -b---- 6.8 are these two different kinds of PV vm? if yes, is there a way to export the "xl create" one as xva/ova and import it to show up like the others? Thanks in advance, /c/

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  • Delphi dbExpress and Interbase: UTF8 migration steps and risks?

    - by mjustin
    Currently, our database uses Win1252 as the only character encoding. We will have to support Unicode in the database tables soon, which means we have to perform this migration for four databases and around 80 Delphi applications which run in-house in a 24/7 environment. Are there recommendations for database migrations to UTF-8 (or UNICODE_FSS) for Delphi applications? Some questions listed below. Many thanks in advance for your answers! are there tools which help with the migration of the existing databases (sizes between 250 MB and 2 GB, no Blob fields), by dumping the data, recreating the database with UNICODE_FSS or UTF-8, and loading the data back? are there known problems with Delphi 2009, dbExpress and Interbase 7.5 related to Unicode character sets? would you recommend to upgrade the databases to Interbase 2009 first? (This upgrade is planned but does not have a high priority) can we simply migrate the database and Delphi will handle the Unicode character sets automatically, or will we have to change all character field types in every Datamodule (dfm and source code) too? which strategy would you recommend to work on the migration in parallel with the normal development and maintenance of the existing application? The application runs in-house so development and database administration is done internally.

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  • Connecting Error to Remote Oracle XE database using ASP.NET

    - by imsatasia
    Hello, I have installed Oracle XE on my Development machine and it is working fine. Then I installed Oracle XE client on my Test machine which is also working fine and I can access Development PC database from Browser. Now, I want to create an ASP.Net application which can access that Oracle XE database. I tried it too, but it always shows me an error on my TEST machine to connect database to the Development Machine using ASP.Net. Here is my code for ASP.Net application: protected void Page_Load(object sender, EventArgs e) { string connectionString = GetConnectionString(); OracleConnection connection = new OracleConnection(connectionString); connection.Open(); Label1.Text = "State: " + connection.State; Label1.Text = "ConnectionString: " + connection.ConnectionString; OracleCommand command = connection.CreateCommand(); string sql = "SELECT * FROM Users"; command.CommandText = sql; OracleDataReader reader = command.ExecuteReader(); while (reader.Read()) { string myField = (string)reader["nID"]; Console.WriteLine(myField); } } static private string GetConnectionString() { // To avoid storing the connection string in your code, // you can retrieve it from a configuration file. return "User Id=System;Password=admin;Data Source=(DESCRIPTION=" + "(ADDRESS=(PROTOCOL=TCP)(HOST=myServerAddress)(PORT=1521))" + "(CONNECT_DATA=(SERVICE_NAME=)));"; }

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  • What is The Loop Variable After a For Loop in Delphi?

    - by Andreas Rejbrand
    In Delphi, consider var i: integer; begin for i := 0 to N do begin { Code } end; One might think that i = N after the for loop, but does the Delphi compiler guarantee this? Can one make the assumption that the loop variable is equal to its last value inside the loop, after a Delphi if loop? Update After trying a few simple loops, I suspect that i is actually equal to one plus the last value of i inside the loop after the loop... But can you rely on this?

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  • Is it possible to tweak TStringField to work like TWideStringField in Delphi?

    - by mjustin
    We want to use Unicode with Delphi 2009 and Interbase, and found that to switch the character encoding from WIN1252 to UNICODE_FSS we first have to replace all instances of TStringField with TWideStringField in all datamodules. For around 60 datamodules, we can not simply do this over one weekend. I can see only two options for a migration strategy: find a workaround which allows to use the existing TStringField fields without triggering the 'expected: TWideStringField' error or remove all persistent fields to avoid the string type conflict As far as I know the field types for persistent database fields are registered in some kind of class registry. Could we use this to make Delphi believe that a TStringField is ok for a Interbase character column with UNICODE_FSS encoding? Or can we use a commercial dbExpress driver which work with TStringField in both cases? See also my related question: http://stackoverflow.com/questions/2302670/delphi-dbexpress-and-interbase-unicode-migration-steps-and-risks

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  • What is the best method for implementing mouse wheel activity in Delphi VCL forms?

    - by Brian Frost
    As a long time user of Delphi 7, I've rolled my own mouse wheel handling in a few controls but lately I've noticed that some recent applications only need the mouse cursor to be placed over a control (e.g a list box or tree view) for the mouse wheel activity to cause that control to scroll. This feels nice (as opposed to having to click focus a control before it responds to the wheel. Now I've moved to Delphi 2010 I'm wondering what is the 'correct' behavior? And what can I use in Delphi that avoids me having to bodge this with my own solutions now? Thanks.

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  • Delphi, What do I do about "no GetEnumerator present" error when using a for loop over Excel Interop

    - by Ryan
    Hello, I'm trying to write a Delphi program that will loop through each worksheet in an Excel file and format some cells. I'm receiving an error while trying to use the for-in loop over the Workbook.Worksheets collection, though. The error is specifically: [DCC Error] Office.pas(36): E2431 for-in statement cannot operate on collection type 'Sheets' because 'Sheets' does not contain a member for 'GetEnumerator', or it is inaccessible The line of code this occurs for is: for Worksheet in Workbook.Worksheets do The definition of Worksheet and Workbook is as follows: var ExcelApp: ExcelApplication; var Workbook: ExcelWorkbook; var Worksheet: ExcelWorksheet; I'm porting this code to Delphi from C#, in which it works. Does anyone know why I'd be getting this GetEnumerator error? I'm using the Office 2007 Excel Interop file and Embarcadero® Delphi® 2010 Version 14.0.3593.25826. Thanks in advance.

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  • Virtual machine : is it possible to run a 32 bits guest OS on a 64 bits host OS?

    - by Cédric Girard
    I am a software developer, and I need to use old version of Borland/Embarcadero Delphi 7 for one software. The others ones are PHP software. I will have soon a 64 bits PC, running Linux, but I need a Windows 32 bits virtual machine for Delphi (because Delphi 7 is a bit old, and our clients still use Windows XP 32 bits systems). I already have a VM under virtualbox for my Delphi environment. Will it run fine, or will I have some problem?

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  • Using MyGeneration, doodads, and Oracle XE, is it possible to implement an "auto number primary key"

    - by Michael Rosario
    Hello world. Using MyGeneration, doodads, and Oracle XE, is it possible to implement an "auto number primary key" scheme? Problem facts: I am using Oracle XE. I have implemented the following table and trigger: CREATE TABLE "USERS" ( "ID" NUMBER(38,0), "USER_NAME" VARCHAR2(50), "PASSWORD" VARCHAR2(50), "EMAIL" VARCHAR2(100), CONSTRAINT "USERS_PK" PRIMARY KEY ("ID") ENABLE ) / CREATE OR REPLACE TRIGGER "BI_USERS" before insert on "USERS" for each row begin select "USERS_SEQ".nextval into :NEW.ID from dual; end; / ALTER TRIGGER "BI_USERS" ENABLE / MyGeneration / Doodads created the following stored proc... CREATE OR REPLACE PROCEDURE "XXX"."PI_USERS" ( p_ID IN USERS.ID%type, p_USER_NAME IN USERS.USER_NAME%type, p_PASSWORD IN USERS.PASSWORD%type, p_EMAIL IN USERS.EMAIL%type ) IS BEGIN INSERT INTO USERS ( ID, USER_NAME, PASSWORD, EMAIL ) VALUES ( p_ID, p_USER_NAME, p_PASSWORD, p_EMAIL ); END PI_USERS; The sequence and trigger combination is working fine. The BusinessEntity class in C# does not receive the new ID. Any recommended ways to allow the calling code receive the new record ID?

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  • Is DxScene the "WPF for Delphi"? Anyone used it?

    - by André Mussche
    I am playing with DxScene and VxScene: http://www.ksdev.com/dxscene/index.html It looks very nice and powerful: 3d accelerated vector graphics, cross plaform, nice effects, many 2d GUI controls (vector based), good scaling, transparency, rotating (x, y, z), 3d models, etc. Even with many effects, the CPU stays very low (0%)! http://www.ksdev.com/dxscene/snapshot/screen0.jpeg But can it be seen as a good WPF alternative for Delphi? And does anyone use it instead of normal Delphi VCL?

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  • Delphi exe, will it run with just BDE configuration?

    - by Roddy
    Hi, I've taken over a legacy application and I have the exe created. If I can configure the BDE then in theory it should be possible to run this. Someone indicated that Delphi needs to be installed in order for the app to run. I'm unsure of that - it doesn't quite make sense to me as there is an exe file. Any input from Delphi experts would be appreciated. Roddy

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  • Delphi 6: How to search a dynamic array for sub-string quickly?

    - by Robert Oschler
    How can I search a dynamic array of char in Delphi 6 for a sub-string and get back an index to a match, not a pointer? I've seen functions in Delphi 6 that do this for strings but not for dynamic char arrays. There is a function called SearchBuf but that function returns a PChar pointer to the match location when what I need is the array index of the match. Thanks.

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  • Which bug in the Delphi IDE / VCL do you despise the most?

    - by Ben Daniel
    I've been working in Delphi 7 for the last 6 years now and have learnt to merely submit to the instablity of the IDE. For example, there are particular projects I've inherited which, when working on, I cannot use the CTRL+SPACE dropdown symbol list in the Delphi editor without getting an Access Violation error, this would easily top my list but there are many more. I'd like to know which bugs frustrate you the most.

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  • delphi remove . and .. from path

    - by user80003
    Hello everyone. How can I remove the . and .. from a path in Delphi (not using .NET). I need a function, so I can pass it something like 'c:\program files..\program files...', and I want the function to return to me 'c:\'. Can Delphi do that on its own? Or do I need to do it myself?

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