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66 Cards in this Set
- Front
- Back
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Where does does a active x dll execute?
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Within the main programs address space.
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What is a disadvantage of early binding?
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More restrictions on DLL compatibility. If you add a new public method to a class the main program will not know about that method.
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What does publicNotCreateable mean in relation to activeX objects?
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The main program can use this type of class but cannot create new instances using the New keyword or with CreateObject.
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The six objects and methods of EOM are what?
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1)Core objects
2)Form manipulation 3)Event Response 3)Add-In Management 4)Project and componet manipulation 5)Code manipulation |
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When working with a Active X object the main program can work only with what?
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Members declared as public
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When using a interface how would I declare a class named clsData the implements IData?
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Dim clsData as IData
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What is faster a ActiveX DLL or a ActiveX EXE?
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ActiveX DLL
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What is a OCA file?
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A binary file that functions as both and extended type libary file and a cache for the custom control.
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Why are ActiveX EXE's sometimes useful.
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They can run on a different computer then the main program.
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When you try instance a class that in no longer compatible what error message will you get?
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Class does not support Automation or does not support expected interface.
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Between a ActiveX DLL or a ActiveX EXE what is ussually prefered?
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A dll
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For every custom control file (OCX) there is and accompanying what?
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.OCA file of the same filename
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Where is and ActiveX EXE run?
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It runs in a seperate process.
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What is polymorphism?
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The idea that many classes can provide the same property or method, without having to worry what type of class it is.
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What does the function Trim do?
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Removes leading and trailing spaces from string
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How would you acomplish early binding in a application.
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Go to projects and then select references. Find the object you want to bind to.
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With the Winsock control after you set what port we want to tell Winsock to do what?
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Make it so Winsock waits for a connection. The syntax is WindSock.listen
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What are the advantages of early binding?
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1) You can use intellisense
2)It is faster |
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With a VB message box what icon constants can you use?
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vbQuestion
vbInformation vbExclamation vbCritical |
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When you use late bound objects you declare them how?
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As object
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What happens when you pass ByVal?
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Visual Basic passes a copy of the variable to the procedure. The procedure gets the value but any changes it makes will not affect the original variable.
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What do interfaces provide?
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The provide a template for classes, which forces any classes that use the Interface to have the same properties and methods as the interface.
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What is the function STR used for?
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Returns a number converted to a string.
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When you bind your Active X DLL or Active X EXE at runtime it is know as what?
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Late binding
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What is the Instr function used for?
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Locates a substring in another string.
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In a class the implements a interface all procedures and properties are declared as what?
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private
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In the string ABABABAB if you wanted to remove all the a's and print it to the debug window what would you do?
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debug.print _
Replace ("ABABABAB"), "A", "") |
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Any class that uses an Interface must provide what?
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They must provide the methods and properties the interface has.
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What does the Extensibility Object Model (EOM) consist of?
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It consists of six loosly coupled packages of objects with methods that implement key services of the VB object model.
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How does Visual Basic and COM provide polymorphism?
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by using interfaces, which are basically templates.
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What is the function Asc used for?
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Returns ASCII or ANSI code of a character.
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How do you create a interface in Visual Basic?
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You simply create a new class with all the properties and methods you want, leaving the actual procedures blank.
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When using the Winsock control the first thing we must do after adding it to the form is what?
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Set the port. ex WinSock.localport = 3343
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What is the function Chr used for?
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Character corresponding to a given ASCII or ANSI code.
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What control can you use with Visual Basic to allow you to communicate across the internet or network.
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Winsock Control
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What is the RND function used for?
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Returns a random number.
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The Winsock control can be run under two modes what are they?
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1) TCP
2) UDP |
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How do you accept a connection request to the winsock control?
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In the Winsocket_ConnectionRequest event you must
1) Winsock.close 2) Winsock.Accept requestid (value passed in) |
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What kind of constant can't you have in a class module?
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A public constant
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When getting the value from a procedure or function parameter you can do it more then one way. What are they?
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ByRef
ByVal |
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What is the Multiuse of the instancing property of a DLL used for?
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Can be created as a new object in another project. Class is loaded when first used.
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What is the Now function used for?
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Current time and date.
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What does the Abs function do?
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Returns the absolute value of a number.
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What keyword do you add to save a value to the registry?
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SaveSetting
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How would you remove a reference to a object name objForm in your code?
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set objForm = nothing
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Where does the bulk of the API functions reside?
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1)kernel32.dll
2)user32.dll 3)gdi32.dll 4)shell32.dll |
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In the days of windows 3.x if you wanted to save any application setting it would have to be done how?
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In a INI file.
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What section of the registry are VB created preferences saved to?
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HKEY_USERSCurrentUsersSoftwareVB
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When you pass ByRef what happens?
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VB passes a pointer to the procedure. This is a reference so that the procedure knows how to find the value in memory.
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What is a type library?
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Is a file or component within another file that contains OLE automation standard descriptions of exposed objects, properties, and methods.
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What do we use to tell VB that we intend to put all the properties and methods necessary to expose a predefined interface?
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Implements
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What is the default way to get a value from a procedure or function?
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ByRef
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What is a .frx file?
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A binary file used to expose binary information for a form.
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What is the Format Function used for?
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Returns date or number converted to a text string.
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If you declare a UDT in a form in must be declared as what?
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Private
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What does the VAL function do?
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Returns a numeric value of a given text string.
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When creating a DLL what are the different values you can set the Instancing property to?
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1) Private
2) Multiuse 3) GlobalMultiuse |
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What does EOM stand for?
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Extensibility Object Model
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What is new with API's in VB.NET.
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They have been phased out
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How would I make a constant value 3 = vbThree ?
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Const vbThree = 3 in the general declarations section.
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What is the GlobalMultiuse of the instancing property of a DLL used for?
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Methods and properties can be accessed from other projects like any other VB function. Class is loaded when the project that uses it is started.
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When using VB message boxes what are the button constants you can use?
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vbOKOnly
vbOKCancel vbYesNo vbYesNoCancel vbAbortRetryIgnore vbRetryCancel |
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What is the Extensibility Object Model (EOM) used for?
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It is the ability to entend, stretch, the functionality of different development tools.
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What is key in a registry?
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It is the item your value is stored in.
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What does the function Timer return?
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Number of seconds elapsed since midnight
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To get a setting already saved in the registry using VB you would use what?
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GetSettings
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