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Datawindow column sorting

Question: I am looking for a way to display an arrowin the the “sorted column” heading to indicatethe direction and column sorted. This functionality can be seen in MS-Exchange. Answer:

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ToolBar

Question: Can I change the font size of the ToolBar text for the application (not the development painters)? Answer: No. The font size is taken from the user’s operating system

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Scaling DW

Question: How can I scale down a DW object? Why is the DW object Ruler inch size much bigger than a real inch size? Answer: You can scale a datawindow

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Read specific number of chars from file

Question: I am a rookie at PowerBuilder. I use PB 5, and I can’t seem to find a function that reads a specific number of chars from a file into

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Powerbuilder / application directory

Question: How do I get the application directory for a PB5-16 app? Answer: You can use the API call GetCurrentDirectory when your application starts to find out its home directory.

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Unions in C++

Question: I am trying to find some information on Unions in C++, specifically syntax and some type of example and perhaps a discussion as to when and why they are

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Draw order of dynamic datawindow objects

Question: How can I control the draw order (i.e., BringToFront, SendToBack) of datawindow objects dynamically created in the deatil band? Answer: At design time you can layer objects by using

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Weird error message (classes related)

Question: I can compile all of my .cpp files (they were written by my teacher), but I get error messages when I try to run them. I get a make

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How to terminate a program safely?

In standard C, the functions abort() and exit() perform an immediate program termination, regardless of where they are called from. Although this also works in C++, it is usually not

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Local SQL

Question: In Delphi 1 I am trying to emulate the “..” function for wild card search in Paradox in Local SQL. I am aware of ‘like’ but it is not

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Using Output parameter with TQuery

Question: In a TQuery component, I use the SQL property to call up a stored procedure which is kept on a MSSQL server. The string used is ‘Execute [nameofproc] :param1,

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API functions

Question: I want to ask you how can I run windows applications inside of Delphi applications (for example notepad.exe)? Answer: It’s actually even simpler than that… Look in the tips

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Telling your program about modifications

Question: An ordinary Stringgrid with 5 columns and 7 rowsThe user wants to add 1 or 2 more rows. So farI know how to write the code! But where do

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Converting strings to reals

Question: I am trying to read in a value of pi/4 from an editbox. Is there a built in command to convert it to a real from a string or

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Copying a file for source to target in Delphi

Question: How to I copy a file from a source to a target in Delphi. I have been trying: SourceId := OpenFile(Source, FileStructure1, of_Read); if SourceID = -1 then ShowMessage(‘Unable

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Beware of throwing exceptions from a destructor

The most plausible way to report a failure during object construction is by throwing an exception. However, this is not recommended for destructors. The problem is that a destructor may

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When is virtual inheritance needed?

Multiple inheritance is a powerful and useful feature in C++, but it can lead to a problem known as the DDD or “Deadly Diamond of Derivation”, as in this case:

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Strange linked list

Question: How can I create a linked list that contains different datatypes? For example: assume that I have Human as a basic class. Man and Woman are two children to

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WinCE / Access97

Question: Can you design an Access97 application to run on a Windows CE machine? Has this been done? By whom? And finally, do you need to create a runtime version

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find and replace values loaded in memory

Question: I am trying to write a program that will search memory for a hexadecimal string and replace it with the values hardcoded in my program. It’s a game cheat

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Mainframe connectivity

Question: I am looking for a way to use VB to connect and retrieve information from a VAX mainframe. The computer has a windows 95 emulation terminal program, and I

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CE2 accessibility options

Question: This might not be right on topic, but I’m hoping to receive an answer by e-mail. My daughter, eight, has cerebral palsy and can use only her left hand.

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Advantages of WinCE

Question: What advantages does WinCE have over other handheld palmtop operating systems such as the Newton and others? Answer: Wow! Now that’s a leading question. Here’s the short version of

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2GB+ files

Question: How do you determine the file size of files which are larger than 2GB? Also, how do you seek into a files larger than 2GB?Thank you Answer: You might