Notação Húngara

Abaixo a listagem de prefixos utilizados para a padronizar nomes de controles no VB.

Control type	prefix	Example
3D Panel	pnl	pnlGroup
ADO Data	ado	adoBiblio
Animated button	ani	aniMailBox
Check box	chk	chkReadOnly
Combo box, drop-down list box	cbo	cboEnglish
Command button	cmd	cmdExit
Common dialog	dlg	dlgFileOpen
Communications	com	comFax
Control (used within procedures when the specific type is unknown)	ctr	ctrCurrent
Data	dat	datBiblio
Data-bound combo box	dbcbo	dbcboLanguage
Data-bound grid	dbgrd	dbgrdQueryResult
Data-bound list box	dblst	dblstJobType
Data combo	dbc	dbcAuthor
Data grid	dgd	dgdTitles
Data list	dbl	dblPublisher
Data repeater	drp	drpLocation
Date picker	dtp	dtpPublished
Directory list box	dir	dirSource
Drive list box	drv	drvTarget
File list box	fil	filSource
Flat scroll bar	fsb	fsbMove
Form	frm	frmEntry
Frame	fra	fraLanguage
Gauge	gau	gauStatus
Graph	gra	graRevenue
Grid	grd	grdPrices
Hierarchical flexgrid	flex	flexOrders
Horizontal scroll bar	hsb	hsbVolume
Image	img	imgIcon
Image combo	imgcbo	imgcboProduct
ImageList	ils	ilsAllIcons
Label	lbl	lblHelpMessage
Lightweight check box	lwchk	lwchkArchive
Lightweight combo box	lwcbo	lwcboGerman
Lightweight command button	lwcmd	lwcmdRemove
Lightweight frame	lwfra	lwfraSaveOptions
Lightweight horizontal scroll bar	lwhsb	lwhsbVolume
Lightweight list box	lwlst	lwlstCostCenters
Lightweight option button	lwopt	lwoptIncomeLevel
Lightweight text box	lwtxt	lwoptStreet
Lightweight vertical scroll bar	lwvsb	lwvsbYear
Line	lin	linVertical
List box	lst	lstPolicyCodes
ListView	lvw	lvwHeadings
MAPI message	mpm	mpmSentMessage
MAPI session	mps	mpsSession
MCI	mci	mciVideo
Menu	mnu	mnuFileOpen
Month view	mvw	mvwPeriod
MS Chart	ch	chSalesbyRegion
MS Flex grid	msg	msgClients
MS Tab	mst	mstFirst
OLE container	ole	oleWorksheet
Option button	opt	optGender
Picture box	pic	picVGA
Picture clip	clp	clpToolbar
ProgressBar	prg	prgLoadFile
Remote Data	rd	rdTitles
RichTextBox	rtf	rtfReport
Shape	shp	shpCircle
Slider	sld	sldScale
Spin	spn	spnPages
StatusBar	sta	staDateTime
SysInfo	sys	sysMonitor
TabStrip	tab	tabOptions
Text box	txt	txtLastName
Timer	tmr	tmrAlarm
Toolbar	tlb	tlbActions
TreeView	tre	treOrganization
UpDown	upd	updDirection
Vertical scroll bar	vsb	vsbRate

Suggested Prefixes for Data Access Objects (DAO)

Use the following prefixes to indicate Data Access Objects.

Database object	Prefix	Example
Container	con	conReports
Database	db	dbAccounts
DBEngine	dbe	dbeJet
Document	doc	docSalesReport
Field	fld	fldAddress
Group	grp	grpFinance
Index	ix	idxAge
Parameter	prm	prmJobCode
QueryDef	qry	qrySalesByRegion
Recordset	rec	recForecast
Relation	rel	relEmployeeDept
TableDef	tbd	tbdCustomers
User	usr	usrNew
Workspace	wsp	wspMine

Some examples:

Dim dbBiblio As Database
Dim recPubsInNY As Recordset, strSQLStmt As String
Const DB_READONLY = 4            ' Set constant.
'Open database.
Set dbBiblio = OpenDatabase("BIBLIO.MDB")
' Set text for the SQL statement.
strSQLStmt = "SELECT * FROM Publishers WHERE & _
   State = 'NY'"
' Create the new Recordset object.
Set recPubsInNY = db.OpenRecordset(strSQLStmt, _
   dbReadOnly)

Suggested Prefixes for Menus

Applications frequently use many menu controls, making it useful to have a unique set of naming conventions for these controls. Menu control prefixes should be extended beyond the initial "mnu" label by adding an additional prefix for each level of nesting, with the final menu caption at the end of the name string. The following table lists some examples.

Menu caption sequence	Menu handler name
File Open	mnuFileOpen
File Send Email	mnuFileSendEmail
File Send Fax	mnuFileSendFax
Format Character	mnuFormatCharacter
Help Contents	mnuHelpContents

When this naming convention is used, all members of a particular menu group are listed next to each other in Visual Basic’s Properties window. In addition, the menu control names clearly document the menu items to which they are attached.

Variable Scope Prefixes

As project size grows, so does the value of recognizing variable scope quickly. A one-letter scope prefix preceding the type prefix provides this, without greatly increasing the size of variable names.

Scope	Prefix	Example
Global	g	gstrUserName
Module-level	m	mblnCalcInProgress
Local to procedure	None	dblVelocity

A variable has global scope if it is declared Public in a standard module or a form module. A variable has module-level scope if declared Private in a standard module or form module, respectively.

Note   Consistency is crucial to productive use of this technique; the syntax checker in Visual Basic will not catch module-level variables that begin with "p."

Constants

The body of constant names should be mixed case with capitals initiating each word. Although standard Visual Basic constants do not include data type and scope information, prefixes like i, s, g, and m can be very useful in understanding the value and scope of a constant. For constant names, follow the same rules as variables. For example:

mintUserListMax      'Max entry limit for User list
                  '(integer value,local to module)
gstrNewLine            'New Line character
                  '(string, global to application)

Variables

Declaring all variables saves programming time by reducing the number of bugs caused by typos (for example, aUserNameTmp vs. sUserNameTmp vs. sUserNameTemp). On the Editor tab of the Options dialog, check the Require Variable Declaration option. The Option Explicit statement requires that you declare all the variables in your Visual Basic program.

Variables should be prefixed to indicate their data type. Optionally, especially for large programs, the prefix can be extended to indicate the scope of the variable.

Variable Data Types

Use the following prefixes to indicate a variable's data type.

Data type	Prefix	Example
Boolean	bln	blnFound
Byte	byt	bytRasterData
Collection object	col	colWidgets
Currency	cur	curRevenue
Date (Time)	dtm	dtmStart
Double	dbl	dblTolerance
Error	err	errOrderNum
Integer	int	intQuantity
Long	lng	lngDistance
Object	obj	objCurrent
Single	sng	sngAverage
String	str	strFName
User-defined type	udt	udtEmployee
Variant	vnt	vntCheckSum

v       Variable passed by value (local to a routine)

r       Variable passed by reference (local to a routine)