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The Latest

DevX - Software Development Resource

32-bit VCL Errors

Question: I’ve downloaded some components for use in Delphi 2.0, but I can’t get them to install into the VCL. Even the 32-bit dedicated ones come up with an error

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Adding lines to a TStrings Type Property

Question: What am I doing wrong? I can insert the date and time to a Label component very easily (see first proc below), but not into a RichEdit component. I

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Changing the Font

Question: I can’t stand the “new” font used in VB5’s pulldown menus and forms (ie. File, View, Tools, etc.).I’ve tried and tried, but I can’t seem to change it. Answer:

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API declarations

Question: Where can I take all the new API declarations about the network, like: NetServerGetInfo, NetServerTransportAdd… Answer: If you just want the declarations, you can add Windows API Functions as

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Business function in the MATH unit

Question: I recently incorporated the math unit into an application I’m building. Originally I was using OLE to Excel to perform my business calculations, and though this was a clean

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Alternative to the BDE

Question: I have database software that is about 1 MB in size (with all the files). I need to distribute the BDE, which uses up to two diskettes. I do

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An event when the table record changes

Question: While the OnDataChange event is called when a record is changed, it is called several times for each change and then each time a piece of data changes in

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Changing Label Captions in a FOR Loop

Question: I’m trying something like this: for i:=0 to 1000 do label1.caption:=’I= ‘+inttostr(i); but the loop executed so fast, the label doesn’t display anything until the loop is over. This

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Beginner

Question: I’m trying to mock some screens which is pretty simple but I do need a couple of commandbuttons to bring up another screen.For example, when the user pushes the

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Cannot load form, unspecified error

Question: I have a project that exists on a NT 3.51 machine. When I copy all source code, etc. to my Win95 PC, Delphi does not load the main form.

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Creating paradox-type tables at runtime

Question: I want to create paradox-type tables at runtime, which I am generally doing in this way:Table1.FieldDefs.Add(‘IDnum’, ftInteger, 0, False)….Table1.CreateTableHowever, there seems to be no FieldType for an auto-increment number

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How to access your comport

Question: How can I access my comport? How can I send bytes to the datatransfer pin? I’m using Delphi 1.0I’ve tried writecomm and transmitcommchar (and I’ve opened the port with

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‘Structs and classes

Question: Please examine my code and tell me what I am doing wrong!This is the first part of my program:#include #include class LinkedLst{ public: LinkedLst(); //Constructor void AddToFront(int Value); //Add

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Overloading the assignment operator “=”

Question: I am puzzled at the way in which the assignment operator is overloaded in C++. Would you please show an example as to what efficient code for overloading this

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ActiveX and Delphi

Question: Does Delphi support ActiveX? If so, do I need something extra to run ActiveX controls in Delphi? Answer: As long as the OCX is registered (which you can do

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Type conversion

Question: How does one convert a double to an int? Is there a function like floor that actually returns an int? Answer: There are many things you can do to

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The time.h Header File

Question: I am trying to write a program that provides a constructor that’s capable of using the current time from the time() function declared in the C standard library header

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Processor fault

Question: Why do I get with the following program, this error: general protection exeption, 0x215f:0x1ef3timer(1) 0x215f:0x1ef3 Processor fault.Program (very small):#include #include int get_value (int _value);void main (void){ int _time=0; int

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Two-dimensional array

Question: How can I dynamically declare a 2D array and pass it as a parameter to a function?Here’s an example of what I’m trying to do:#include #include #include const SIZE

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Exporting data

Question: I wasn’t able to find out what all the command line switches for dbexport do. The only ones I found were -o and -c.Is there a way to export

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What happens to dangling pointers in java?

Question: What happens to dangling pointers in Java? Supposedly there is garbage collection, but when is it performed? From what Ihave read, it seems really easy to have persistent danglingpointers

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Initializing a deck of cards using a for-loop

Question: I have two enumerated types: enum suit_type{club,diamond,heart,spade} and enum rank_type{ace,two,…,queen,king}. In structure CARD, I have the variables suit_type suit and rank_type rank. In class PILE, I have a private

DevX - Software Development Resource

Virtual function tables

Question: I would like to know what virtual function tables are. When one refers to vtables, is it a virtual function table that is implied? Answer: In short, vtables are