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The Latest

DevX - Software Development Resource

Recovering Data from an Old .OST File

Question: Recently, we had a server die on us with bad backups. We have installed a new server and have reestablished all the mailboxes. I have one mailbox that is

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Converting GETDATE to 24-Hour Format

Question: Using GETDATE returns the time portion of the date in the 12-hour clock form (“08:30pm”). I need the time portion to be in 24-hour clock form (“20:30”). I can’t

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None Specified Datawindow Retrieval Arguments

Question: I have a datawindow that will be called by two functions. The first function only uses the first retrieval argument; the second function uses all three arguments. In the

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Finding Column and/or Row Height

Question: I have a column that is set to Autosize Height. I would like to find the column height for this column on each row after the data has been

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Is Exchange the Answer?

Question: I am setting up a new post office SYS. We have five sites over the United Kingdom. Is Exchange the right product to use? We would require replication of

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Don’t include Extender properties in ActiveX Wizard

The left-most listbox in the first page in the ActiveX Control Interface Wizard includes all the properties exposed by the constituent controls currently on the UserControl’s surface. Unfortunately, this list

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Declaring a typedef

typedef names can hide intricate syntactic constructs such as pointers to functions and template instances. However, many novices simply don’t know how to declare a typedef, or worse yet

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Deep Copy and Shallow Copy

The terms “deep copy” and “shallow copy” refer to the way objects are copied, for example, during the invocation of a copy constructor or assignment operator. In a deep copy

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Declaring Pointers to Data Members

Although the syntax of pointers to members may seem a bit confusing at first, it is consistent and resembles the form of ordinary pointers, with the addition of the class

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The Representation Of Pointers To Members

Although pointers to members behave very much like ordinary pointers, behind the scenes, they are not necessarily represented as pointers. In fact, a single pointer to member usually consists of

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Declaring Pointers to Member Functions

Pointers to member functions consists of the member function’s return type, the class name followed by ::, the pointer’s name, and the function’s parameter list. For example, a pointer to

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Returning an Argument by Reference

Question: What exactly returns a C++ function if it returns an object by a reference like: Person& GetNextPerson(); Please explain at assembly level, if possible. Answer: Assembly speaking, such a

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Open ODBC Connection Without Hardcoding Password

Question: In my ASP page, I open an ODBC connection with: Set Conn = Server.CreateObject(“ADODB.Connection”)Conn.CommandTimeout = 600Conn.open “Database_name”,”Username”,”password”. How can I avoid hardcoding the password in the ASP source? Answer:

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Data Source Name Not Found Error ‘80004005’

Question: What does this error message mean? Microsoft OLE DB Provider for ODBC Drivers error ‘80004005’ [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified /SampleProject/default.asp,

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Overloading istream operator >> for bool

Question: I am trying to overload the istream operator >> to work with type “bool”. From my point of view the code looks okay, except the VC++ 6.0 compiler tells

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Cross Platform Compilers

Question: Is there a C++ compiler that I can use to go cross-platform with development?I need to develop the same DLLs for AS400, Sun, and Windows. Answer: I’m not sure

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Are Borland’s Delphi and C++Builder code-similar?

Question: I am trying to decide between purchasing Borland’s Delphi or C++Builder. Can the VCL code written to work in Delphi also work in C++Builder (latest versions for both)? Answer:

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C++ Comments

Question: Why isn’t C commenting style preferred in C++? C commenting style definitely looks neater and more readable than the C++ commenting style. Answer: /* comments in C++ are just

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Accessing Arrays

Question: Normally, you access an array by the number of the element you want. Is it possible, in C++, to access an element by the value and return the number?

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Display Date and Time of File Upload

Question: How can I display the date and time a file was uploaded to my Web server using ASP? Answer: If you can access the file from an ASP page,

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Updating a VB6 DLL on the Web Server

Question: We have Internet Information Server (IIS) 4.0 running Active Server Pages (ASP) with a Visual Basic 6.0 DLL serving data content to the ASP pages. The problem lies when

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Dynamically Insert Text Into a Text Box

Question: How can I provide the user with a combo box and based on his selection populate the data in a text box? The data has to come from a

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Understanding Session_OnStart and Application_OnStart

Question: I am confused regarding the Application_OnStart and Session_OnStart events in the global.asa file. What I feel is that the application_onstart event is triggered the very first time the application

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Connect to a Remote Database Using ASP

Question: How do I connect to an Access database that resides on a network server other than the Web server? My goal is to query the Access database and display

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Overloading The ! Operator

Question: Is it possible to have a postfix version of the ! operator? Answer: No, you cannot alter the associativity, ordering and position of built-in operators when you create an

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Cannot Call API Functions From ASP

Question: Can I use Windows API calls in ASP? If so, do I have to declare functions? Answer: Unfortunately, at this time you cannot call API functions from ASP. The

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Access Data From SQL Server in ASP

Question: I’m using Microsoft SQL Server 6.5, Active Server Pages (ASP), and ActiveX Data Objects (ADO). When I retrieve a string with a value of “New York” from the table