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Universal Naming Convention (UNC)

Question: For file-based applications, how is the Universal Naming Convention obtained for path names? Answer: To get the UNC name of a drive-based path, use the Windows API callWNetGetUniversalName. This

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Best Way to Delete Master Detail Records

Question: As you know, when you create .db tables with referentialintegrity (i.e. Paradox or Desktop), this makes detail records that dependon the master. When you want to delete records in

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Resetting Net and Lock Files

Question: Is there a way to reset the net and lock files that an application develops withouthaving to shut down the software? Even a temporary pause would be acceptable. We

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Delphi Queries and SQL

Question: I am trying to perform multiple queries, and to speed things up I want to perform a query on the result of a previous query. Is there an easy

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Help for a Delphi 2 Beginner

Question: I’m trying to teach myself Delphi 2 and have no programming experience. I’m stuck on a simple problem. How do you bring up the About box from the About

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DBLookupComboBox

Question: Can the drop-down items for a DBLookupComboBox be populated from the results of a TQuery? Answer: Yes, a query can act as the data source for a TDBLookupCombo. You

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Strings in List Boxes

Question: When a user clicks on an item in a list box, how can I get the actual string that was clicked on? For example, if ‘dog,’ ‘cat,’ and ‘fish’

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Pulling Digits Out of String to Sum Them

Question: How do I pull out every second digit from a string and sum them? Answer: This is a rather unusual question, but it’s not that hard to accomplish.What must

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Compiled Program won’t Run

Question: I’m a Delphi rookie but an experienced programmer in Turbo Pascal.I’m trying to use DBF tables, with good results.But when I copy my compiled programs to a disketteand install

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Passing Info to Word Processing Template

Question: I have a couple of questions about passing information to aword processing template and controlling the saving of the template toanother name. I appreciate any guidance you can provide.

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Date Comparisons

Question: I cannot find much info on how to do Date math. I am trying to determine elapsed days from a record entry date to the current date. I am

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DATABASES and TABLES

Question: I have a table. When I delete an item, the size of the table won’t change. I think the delete command for tables doesn’t move up the entries but

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Calling a DOS Command

Question: How can you call a DOS command under Delphi 2.0? For example, I want to do a “TYPE >prn” from Delphi. Answer: You can do it with CreateProcess. Refer

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Extending TCustomControl Painting

Question: I have two questions:Question 1:How can I extend the painting functionality of a TWinControl like the TGraphicControl‘s Paint method? Question 2:I cannot find the Paint method in TWinControl to

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ActiveX/OCX objects in Delphi 3

Question: I am currently trying to convert three components to ActiveX components. I am doing this through Delphi 3, which I realize some people do not have access to.I need

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Calling the Operator =

Question: How can I call the operator= of the base class from the operator=in the derived class?The data member in the base class is a private data member. I want

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Difference between yield() and sleep()

Question: What is the difference between calling yield() and sleep()? Also, in what instances would you call either method? Answer: The Java platform uses the multithreading facilities of the host

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ClassFormatError

Question: I’m a beginner in Java. I’ve tried two different applets now (one of which I borrowed from another site), both of which involved text fading and color changing. I

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More than One Class in Same File?

Question: Is it possible to have more than one class in the same file ? Answer: Yes. The file Foo.java may contain several class declarations, but amongthem must be a

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Changing Applet’s Background Color

Question: Can you tell me how to change the background color of an applet from the normal grey to white? I would greatly appreciate it. Answer: Try putting the line:

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Memo Fields and Carets

Question: I need to be able to move the caret in my memo field back to the begining of the field. Any idea how I do this? Answer: Try this:Memo1.SelStart(0);This

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Insufficient Memory, TFloatField in TQuery

Question: 1. I developed an application, but after running for about one hour, a message error: “Insufficient memory to do the operation” occurred. The error did not cause the application

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DBGrid

Question: I am using a DBgrid. I have defined two NEW Persistent fields as lookupfields. In the Columns editor, I added them to the grid display. Those two fields are

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Playing a sound collection

Question: I have 10 .wav files that I want to play in a loop.If I make the mmplayer wait property true, I suffer from control failure during the loop time.I

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Is there a way to kill a sleeping thread?

Question: I am creating numerous threads on-the-fly in Delphi 2.0. I create them suspended. The question is: How do I make the threads go away? I’ve tried Free, Terminate… nothing

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Dynamic Buffer

Question: I’m using Delphi to do a client-server application in which all the lines I get from a socket I send to a TMemo in my form. I want that

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Flat Combo

Question: Do you know how to create a flat, non-3D combo box with only a thin black border? Setting CTL3D to False doesn’t seem to have an effect on the