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Scrolling status bar message

Question: How can I make a message that will scroll in the status bar? Answer: The following applet constructs a thread, passing it a messageand its browser context. The thread

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Tables and SQL

Question: How do you count the number of rows displayed in a DBGrid when displayed through a query? Using TQuery, I get 50 to 60 files, but want to know

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TDBGrid

Question: How is possible to invert the order of a table display in a TDBGrid Component?Must it be an Index-DatabaseSource?For example, if in the database was stored:1Pippo2Gino 3PlutoHow is it

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Two-table Update

Question: I’m a Paradox for Windows convert. In Paradox it’s a relatively simple thing to create a query that changes data in a field of one table with the values

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How to tell when to time-out

Question: How can I determine that a user has been inactive for a certain length of time so that I may exit the application? Answer: This is an interesting question

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TEdit and right-justification of text

Question: How can I get a TEdit to display right-justified text? Answer: There is no way to do this at runtime because there’s no facility in TEditto right-align text. The

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Unknown EDBEngineError

Question: I am getting an usual message from exception class EDBEngineError. The message is simply: “At beginning of table.”What does that mean? I am building a TQuery SQL property in

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Screen resolution

Question: I am developing an application in Delphi 2.0 on a 1024×768 resolution (large fonts), and have been trying to get it to act properly in 800×600 mode with little

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Record locking (Delphi 2 Paradox 5)

Question: We are trying to write a multi-user Delphi 2.0 app (with Paradox 5.0 tables), and are looking for a way to determine if a record is locked by another

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JDK1.1 and Web browsers

Question: Do the changes made in the 1.1 API mean that if one wanted to write applets for the Web, one would have to use a previous version of the

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Data input

Question: I need to pass some data from the user to my applet (or application) which is to be entered from the keyboard, using TextField.The data is repetitive (it fills

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Java Strings: Mutable or immutable?

Question: I don’t understand why it is said that Strings are immutable in Java. Here is a small piece of code which shows that Strings are in fact mutable:class TestStringStuff{public

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Threads

Question: I recently took Sun’s Certified Java Programmers Exam and I ran into a few questions from the exam I’d like to ask you.What is the difference between >> and

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How to implement a linked list

Question: How can I implement a linked list using Java, since there are no pointers? Can you provide sample code that uses a linked list?Thanks! Answer: You need pointers to

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CreateOleObject errors

Question: My completed Delphi application exports Quick Reports to Excel. This operation is 99.5 percent successful, and users are delighted. I am one of the developers, and one of the

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Conversion from Paradox to Delphi

Question: I want to convert some code written in Paradox to Delphi. I am mainly interested in a quick method rather than the usual method. The code deals with the

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Database application deployment

Question: I want to deploy a database application developed with Delphi 2 that will access an Interbase database via TCP/IP, but I cannot find any documentation that describes precisely which

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Creating control from code in Delphi

Question: I want to create a button in code, put it on a form and attach a procedure to its click event. How can I get the click event linked

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Database “index out of date” error

Question: I am working on a Delphi program in which I am inserting information into a database table by running a student’s ID card through a scanner. I was testing

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Corrupt Paradox file

Question: Last week I had a head crash on a PC using Delphiand Paradox files. I was able to recover everything but a log file for the month of March.

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How to create a database in code

Question: I was a VB programmer, until my recent shift to Delphi 2.0. How can I create a database in code? Answer: It depends on the type of database youwant