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String formatting

Question: Is there a function that will format a string for number or, say, $$ display? For example: format 1000000 to 1,000,000? Answer: No, the C standard has no such

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C++ equivilant of Basic MID$

Question: I need to test for a certain char in a char array.For example, in BASIC I would have: if mid$(string,1,1) = “`” then blah blah blah…. How would I

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Sorting in a ListView

Question: I would like to know how to program a Custom Sort procedure on a ListView in Borland’s C++ Builder. Answer: Normally, the ListView control will sort items automatically for

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Return type _Cdecl

Question: I have seen that in many of the header files in C++ the return type is _Cdecl. For example, in complex.h, we have the following: friend complex _Cdecl acos(complex&)

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Quick sort

Question: I have pseudocode for a quick sort. I know how to implement it in Pascal. Is there simple code for quick sort in C++? How can I find other

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External file execution

Question: How can I code a Visual C++ program that will execute a DOS bat file? Or any other executable file, for that matter? Answer: Use the system() function. This

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Functions and parameters

Question: I know this may sound like a dorky question, but can you explain to me?as if I were a little kid?what are functions, and why and how are parameters

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Pointers to member functions

Question: I am having lots of trouble calling a class member function pointer that is declared within the same class. So far the following compiles: class testClass {public: void (testClass::*ptr)();

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Integer lengths

Question: What function gives the actual length of an integer or long integer? For instance, 8 is 1 long, 12345 is 5 long, etc. Answer: Use the sizeof() operator to

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Performance—C vs C++

Question: What are the performance tradeoffs of using C++ instead of C? Are there any ways of overcoming these tradeoffs? Answer: In general, C++ is every bit as efficient as

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Adding to the front of an array

Question: I have to read in integers and be able to add them to the front of the array. How do I do this? Answer: You can either use the

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Windows programming

Question: We use NT 4 WS as the client to our PeopleSoft (Oracle) application, and we need to pick off the information contained on the panel fields. We can easily

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Rebooting NT from VB

Question: How do I reboot (with an option to force) inside of Win NT? I know about the ExitWindowsEx API call, which works fine in Windows 95, but unfortunately this

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File version information under NT

Question: I am using the GetFileVersionInfoSize, GetFileVersionInfo, and VerQueryValue APIs to get the file version of third-party applications. In all cases, GetFileVersionInfoSize returns a large number, but when I query

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Output to I/O port under NT 4.0

Question: Please kindly advise how to output to a PC’s I/O port address: &H158 using Visual C++ under NT 40. For your information, we used to use outp() using C

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FTP

Question: If I ftp to an AS400, I can run a program on it by typing quote rcmd call . Is it possible for me to do the same thing

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Automatic logon problems in NT 3.51

Question: We are running a SCADA package on an NT 3.51 machine at a mine. Since we often have power failures, the PC reboots itself and then requires the operator

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Scheduling A Visual Basic app on NT

Question: I have a VB app that was running on Windows 95 and using the scheduler included with Microsoft Plus. All was well. Now our company is switching to an

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Use Register variables to enhance performance

The C/C++ register keyword can be used as a hint to the compiler that the declared variable is to be accessed very often during program execution, and hence, should be

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Static member function

A static member function in a class can access only other static members of a class or variables which are not members of its class. It can be invoked even

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Retrieving actual object type in run-time

C++ supports Run-time Type Identification (RTTI), which enables detection of actual object type during program execution using the built-in typeid() operator. Here is an example: //file: classes.hclass base{ base(); virtual

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Global objects construction and destruction

In object-oriented programming (OOP), global objects are considered harmful. Particularly in C++, there’s even more reason to think twice before using them: a global object construction occurs before a program’s

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When is a mem-initializer required?

A const member or a reference member cannot be initialized within an object’s constructor. Instead, they must be initialized in the constructor’s member-initializer list. Conceptually, mem-initialization takes place before the

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Uses of an anonymous union

Unions are used to minimize memory waste. For example, consider the following database-transaction class used to update a person’s data. The key can be either a unique ID number or

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Datawindow print dialog

Question: How can I get the Windows 95 print dialog box todisplay instead of the print setup dialog usingprintsetup()? Answer: You have to build your own custom dialog window. The

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Text files with MFC

Question: I have been reading Visual C++ 5 in 21 Days while trying to learn how to use the Visual C++ user interface, and I have been trying to find