VBA 2

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Open EOF

Freefile

Input Input#

Line Input

Print

Write

Close Reset

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This function is used to open a file for eitherinput or output, depending on the exactsyntax used.

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You use this function to obtain the next validnumber for use when performing fileoperations

Note that after allocating a number in thisway, you must open or close a file beforeusing it again, otherwise the same number is

generated.

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◦ intInFile = FreeFileintOutFile = FreeFileOpen "C:\in.txt" For Input As intInFileOpen "C:\out.txt" For Output As intOutFile

◦ intInFile = FreeFileOpen "C:\in.txt" For Input As intInFileintOutFile = FreeFileOpen "C:\out.txt" For Output As intOutFile

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This function indicates when you havereached the end of a file, and as such it isnormally used as the condition for a Do loop.

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This function will read data from a file thathas been written to using the Write function.

As this means that text will normally bedelimited with quotes and similar, it is not of

much use for general text importing.Modecan be

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This function will input a line at a time from the textfile

You will often read this into a temporary variable, andthen split it using the string handling functions (Left,Mid, etc.) as required

This is probably of most use when you have a recordof fixed width

One trick with this function is to read the whole file inone go

this is often faster than reading it line by line or

character by character, and then separating it

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Sub sImportAll()

On Error GoTo E_HandleDim strImport As StringDim lngChars As LongDim intFile As IntegerintFile = FreeFileOpen "C:\test.txt" For Input As intFile

Do while not EOF( intFile )

line input #intfile,fieldsmsgbox fields

LoopGoto E_exit

E_Handle:

MsgBox Err.Description, vbOKOnly + vbCritical, "Error: " & Err.NumberE-exit:End Sub

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This function is used to write data to anoutput file.

I would normally use this function, ratherthan Write, as it does not wrap data in specialcharacters, making the exported moreuniversally available.

E.g. Print filenumber, string

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This function is used to write data to a file,

but as it 'wraps' data with special characters(such as double quotes)

it is not that useful as far as exporting datafor use in other programs is concerned

Also be aware that it ignores locale settings,such as the decimal separator.

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You use this function to close a file that hasbeen opened using the Open statement.

It is important to close files that you haveopened, either using this function or Reset,otherwise they are 'locked'.

E.g. close filenumber

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Returns the number of bytes in a file

E.g.Filelen(filenumber)

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You use this function to reset all files that havebeen opened

therefore it should be used with care, as you mayfind yourself closing a file that has been openedin another procedure

Unless I know that I have a file open in anotherprocedure, I will normally have this statement inthe exit point for a procedure, otherwise I will

use the Close statement on each individual file.

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You encounter error while running the code

Not all error are because of bad code

You might encounter an error because the

procedure might anticipate different data Type Whatever is the cause, you will need determine

source of the error and resolve the issue

The process of finding error is called debugging

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Design Error

Compile Error

Runtime Error

Logical Error

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Predominantly created when you write code

Most design errors are syntax error when youmistype a statement

You create design errors when you forget aboutfunction argument or missing paranthesis

E.g MsgBox(“sample text”

As long as you use the code setting of VBA

editor, you immediately know when a syntaxerror occurs

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Compiling is converting the VBA to the formatthat computer can understand

In other languages you need to compile

before you run the code In VBA compilation of code happens when

you run the macro/subroutine If any error occurs during compile process an

error message box pops up and VBA editorhighlights the location of the error

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You encounter runtime errors when your codeexecutes

If you not handled runtime error the

execution of macro/procedure stops To avoid stopping of execution you need to

write

On Error Resume Next

VBA put information of error in “Err” Object

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Err Object

Error object property

Description Contains VBA descriptionof the runtime error

Number Contains VBA errornumber of the runtimeerror

Source Indicate name of thecurrent procedure whichhas caused as error

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Logical error do not produce any type of errormessage

Instead logical error return unexpected result

E.g Price1 = 4.45

Price2 = 6.95

TotalCost =(Price1 +price2)*1.75

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Working with Workbooks and file

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Workbook can be opened using Open Methodof workbooks Collection

It requires filename

E.g.Workbooks.Open(“C:\Workbooks\budget.xls”)

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You can open a text file within Excel usingOpenText method of workbooks collectionmethod

It requires filename Text file remains text file but you can modify

it using excel as editor

E.g. Workbooks.Opentext filename : =“C:\Workbooks\Sample.txt”), Datatype :+xlDelimited, Tab:= True

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you can retrieve the name of the file withprompting the user with Open dialog box

To display open dialog box, you use theGetOpenFileName method

When you use this method file does not openwhen user clicks ok. The dialog passes thename to variable name and then you canopen the file using open property

E.g. Dim UF as Variant Application.GetOpenFileName(FileFilter :=

“*.txt”, Title:= “Text Files”

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You can save currently selcted workbookusing save or save as method.

e.g workbooks(sample.xls).save

Thisoworkbook.saveas Filename:= Test.xls

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You can request the name, location andformat for saving workbook file from the user

e.g GetSaveAsFileName opens dialogbox

The dialog box does not save the file whereas

it retunes user specified information information to a variable

To save the file you use SaveAs command

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Myworkbook = workbooks(1).name You can compare Myworkbook to filename

you want to check

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You can close the workbook using close method

E.g. Activeworkbook.close or Thisworkbook.close

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You can create new workbook using the Add method of workbooks collection

E.g. workbooks.Add(Tempalate)

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VBA provides ability to delete workbook or any othe file suing Kill method

E.g. kill(pathname)

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You can find file on your computer By using this you can check if file exits

before doing any operation on the file

You use “FileSearch” object to serach for file

on the computer

You can set .filename property to filename you want to search

You can set .LookIn property to directory where you want to search the file

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PRN – 11 Name-12

Course-5

Sem-3

PERCENTAGE-3

Grade-2

-

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Chartsheets Embeded Charts

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Axes Collection – Collection of Axis objects including Axistilte, Border,Gridlines and Ticklables

Chart Area – Chart Area including Border,Font

and Interior object Chartobjects Collection- Collection of chart

objects on the sheet

Charttitle

Datatable – represents chart data table

Legend

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There are different chart types available You can select charttype by specifying

xlChartType constant value of Charttype property

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Dim Newchart as Chart Set Newchart = Thisworkbook.charts.Add()

NewChart.Name = “My Chart Sheet”

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With any chart you must specify chart’s range of data

You use SetSourceData method to specify datasource for your chart

E.g Mychart.SetSourceData

Source:=Worhsheets(“Sheet1”).Range(“A1:A5”)

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Dim Echart Aas ChartObject Set Echart

=Sheets(“Sheet1”).ChartObjects.Add(left:=50,top:=100, Widhth:=300, Height :=400)

Setting the chart type Worksheets(“Sheet1”).Chartobjects(1).chart.ch

artytype =xlColumstacked

[email protected]

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You can use “chartwizard” method of specific chartobject to set different properties of chart objects

Source

Gallery

Format PlotBy

CategoryLabels

SeriesLabels

HasLegend Title

CategoryTitle

ValueTitle

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e.g.Dim SelectChart As Chart

Set SelectChart =ThisWorkbook.Charts(“Chart2”)

SelectChart.ChartWizard Gallery:=xL3DLine,

Format=2,Categorylables:= True

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To define new Data series or to add to existing dataseries you create a new “Series” object and add it to SeriesCollection object using add method

E.g SelectChart.SeriesCollection.Add

Source:=Worksheets(“Sheet1”).Range(“D1:D7” )

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You can customize the text of the chart by changing font and colour attribute

e.g.

With Selectchart

.ChartArea.Font.Name =“Tahoma”

.ChartArea.Font.Colour = RGB(0,0,255)

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You can customize each Axis of the chart using Axis Object properties and Methods

Each Chart Axis is separate object

Axes collection object contains all chart Axis

objects E.g. with SelectChart.Axes(xlValue)

.HasTitle =True

.AxisTitle.Text =“Value Axis”

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