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DevX - Software Development Resource

Checking for NULL Values

Question: When you read a string from a character field in a snapshot/dynaset you can append a pair of double quotes to protect yourself from “Type mismatch” errors, if the

DevX - Software Development Resource

Deleting Control Code

Question: How do I delete a control AND the corresponding code? Answer: When a control is deleted, the code is listed in the (general) section in the Procedures drop-down list

DevX - Software Development Resource

Detecting Combo Box List Retraction

Question: How would you detect the Retraction of a Combo Box Dropdown List in VB 4.0? I have asolution which claims to work under VB 3.0 andVB 2.0 using the

DevX - Software Development Resource

Copying Controls and Code

Question: Is there a way to easily copy all theevent code for a control from one form to another or even within thesame form. As an example I have a

DevX - Software Development Resource

Executing Programs Stored in Variables

Question: Is it possible to store a MS-DOS pathname in avariable, and run the program at that path withthe shell command? Answer: The Shell command can be given a string

DevX - Software Development Resource

Databound Providing Partial Matching

Question: I’m trying to create a DBCombo function on a form which operates similar to MS Access’s ComboBox. As the user types in an entry, character by character, the DBCombo’s

DevX - Software Development Resource

Printing to MS-DOS Window

Question: I would like to create a module that has no visual objects. It just prints to a MS-DOS window and then exits. Is this possible? Answer: Unfortunately, the only

DevX - Software Development Resource

Saving a Picture to Disk

Question: I am able to use the API call ExtractIcon to get an icon from a .VBX, .EXE, or .DLL. I can put the icon in a Picture Control, but

DevX - Software Development Resource

Changing RecordSource at Runtime

Question: At runtime, how do I change the query that I’m using with my data controls to be one a user selected? I don’t want to keep the same name

DevX - Software Development Resource

Accessing Properties

Question: How do you access a Public Property in a class module from an in-project module? For example:In a new project create one class module; “Class1” and one bas module;

DevX - Software Development Resource

Incompatible Version Errors

Question: I know that there is a fix needed in order to use VB 3.0 and Microsoft Access 2.0. I have downloaded the file COMLYR.EXE and have run it. I

DevX - Software Development Resource

Simulating Click Event

Question: How can I have a combo box “combo1” execute another combo boxs “combo2” procedure click ? Answer: Doing this action this way can have some messy side effects. I

DevX - Software Development Resource

Computing Future Value

Question: I am trying to make a financial calculator that will compute Future Value,but I don’t know how to write code for compounded interest. Answer: I believe you want to

DevX - Software Development Resource

Event-Oriented Programming

Question: What’s the meaning of “event oriented programing?” Answer: Basically, it means that you program everything as a response to an event, instead of a topdown program where the ordering

DevX - Software Development Resource

Expanding Functionality

Question: Our firm would like to integrate our Configuration Management tool into VB. I understand some vendors outside of Microsoft have suceeded in adding links to their product via a

DevX - Software Development Resource

Installing all Files Required

Question: I’ve created a small utility. The exe is only 27k, but vb40032.dll, mfc40.dll (for a custom control) and others make the setup zip over 1 meg. Can I leave

DevX - Software Development Resource

Using Tab Control

Question: I have an old DOS-Clipper app that I plan to upgrade to VB. The old app handles insurance claims. To enter a new claim, 4 screens of data are

DevX - Software Development Resource

Misalignment of Columns

Question: I try to align numeric numbers in columns (to be right-justified). Hwvr, some of the numbers don’t right-justify very well. In my example, most of these numbers hve 2

DevX - Software Development Resource

Removing Picture Property

Question: If I apply a picture to a Form’s Picture property, is there a way to clear it out at design time? (Rather than by using LoadPicture “” at run

DevX - Software Development Resource

Locking Box Against Input

Question: I want to disable a text box without having its text dimmed. I know of one way, which is put the controlinto a picture box and disable the picture

DevX - Software Development Resource

Starting Application Through File Manager

Question: What do I have to do to make my application respond to a file-kickstart (double-click)in file-manager? When I select and associate a specific file type with my application it

DevX - Software Development Resource

Determining Exit Method

Question: I am currently experimenting with VB 3.0. In version 1.0 common dialogs provided the information about which button was used to exit from the dialog. I want to know

DevX - Software Development Resource

Highlighting Text

Question: Is there an API function that will highlight a word in a textbox the way the find command does without using the clipboard? Answer: Set the SelStart property of

DevX - Software Development Resource

Creating a Status Bar

Question: How do I put a status bar at the bottom of an MDI parent form like in Word for Windows.Whenever I place a 3d panel on the form it

DevX - Software Development Resource

Playing WAV Files

Question: How can I play WAV or MID files through Visual Basic? Answer: Use the MSMCI.VBX, provided with VB/Win Pro 3.0. You can also declare and call the MM-functions manually:Declare

DevX - Software Development Resource

Pausing After Dialing

Question: How do you pause after dialing a phone number ? I want to be able to dial a pager number and then pause 3 -5 seconds before sending the

DevX - Software Development Resource

Getting all Filenames

Question: I am using VB4.0 Pro (16 bit) in WFWG and need to read entire directory of files, one after the other, without using the common dialog control. Answer: Look

DevX - Software Development Resource

Searching for Text

Question: Can you help to create code for searching a word in a text box Answer: Let’s say that Text1 is your search criteria (word) and Text2 is the text

DevX - Software Development Resource

Keeping a Window on Top

Question: Is there a method of keeping a window “on top” similar tothe Microsoft Office toolbar and various other applications.I need to be able to have a form iconized, then

DevX - Software Development Resource

Illegal SetFocus Call

Question: Sometimes when I call Text1.SetFocusit returns me an “Illegal function call” error. Any idea why? Answer: Normally, if the Form is not visible, you can’t call SetFocus to it.