Need help in checking the file is exists or not

Question

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Hi all

i wrote the below code to create a pdf named "new.pdf" at desktop

VB

Dim strPath As String = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
           .WritePDF(strPath + "\new.pdf")

Now i want to check if the file "new.pdf" is already present then it should create file name like "new_1.pdf","new_2.pdf" and so on else it will create "new.pdf" and the next files

Please tell me how to do this

Posted 3-Jan-13 20:41pm

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tiggerc · Answer 1 · 2013-01-03T20:56:00

Solution 1

there is a function that may be of some use.

VB

file.exists( strpath & "\new.pdf" )

http://msdn.microsoft.com/en-us/library/system.io.file.aspx[^]

so you could use it similar to

VB

if file.exists( strpath & "\new.pdf" ) then
  'Your code to change filename here
end if

Posted 3-Jan-13 20:56pm

tiggerc

Agent__007 · Answer 2 · 2013-01-03T21:13:00

Solution 2

How about this, for generating your fileName

VB

Dim path As String = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
Dim fileName As String = "new.pdf"
Dim count As Integer = 1

While System.IO.File.Exists(System.IO.Path.Combine(path, fileName))
    count = (count + 1)
    fileName = ("new_"  _
                + (count.ToString + ".pdf"))
    
End While

Then you can simple use:

VB

Dim strPath As String = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
           .WritePDF(strPath + fileName)

Posted 3-Jan-13 21:13pm

Agent__007

Updated 3-Jan-13 21:17pm

v2

Comments

[no name] 4-Jan-13 3:58am

It's not showing any error but the file is not creating..while debugging the code it's showing the file name as new_1,new_2 but it's not creating them

Agent__007 4-Jan-13 4:01am

Well, I thought this is being done by your extension method WritePDF(), and you only have problem with generating the fileName. May I know what is WritePDF(string filePath) then?

[no name] 4-Jan-13 4:10am

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

con = New MySqlConnection("Server=localhost; Database=demo;Uid=root; password=1234")
con.Open()
Dim cmd As MySqlCommand = New MySqlCommand("select * from demodata", con)
Dim dt As DataTable = New DataTable()

Dim da As MySqlDataAdapter = New MySqlDataAdapter(cmd)
da.Fill(dt)
'ConvertDataTableToString(dt)
Dim s As String
s = ConvertDataTableToString(dt)

'DataGridView1.DataSource = dt
Dim myPDFClass As New clsPdfWriter
With myPDFClass
'-- Comment the file for learning
.CommentFile = True
.pdfTitle = "Hello World"
.pdfSubject = "First PDF File"
.pdfCreator = "Visual Basic dot Net"
.pdfAuthor = "Charles Cope"
.pdfProducer = "pdfWritter"
.PageCount = 1
.PaperSize = clsPdfWriter.pdfPaperSize.pdfLetter
.ShowingText(1, 100, 720, s, clsPdfWriter.pdfStandardFonts.Helvetica, 8, Color.Black, clsPdfWriter.pdfTextAlign.pdfAlignLeft, 0)
Dim path As String = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
Dim fileName As String = ""
Dim count As Integer = 1

While System.IO.File.Exists(System.IO.Path.Combine(path, fileName))
count = (count + 1)
fileName = ("new_" _
+ (count.ToString + ".pdf"))
' Dim strPath As String = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
.WritePDF(path + fileName)
End While

MsgBox("File has been created ", MsgBoxStyle.Information)
End With
Well this is my button click code..u can check it out..or else if u have any other option that also pls do tell...

Agent__007 4-Jan-13 4:18am

Try changing your line
.WritePDF(path + fileName)
to
.WritePDF(System.IO.Path.Combine(path, fileName))

and also move this line out of and after while loop.

[no name] 4-Jan-13 5:19am

When i m moving the line out of the while loop it giving error saying access denied to that path

Lakshmimsridhar 4-Jan-13 5:59am

when u got the error access denied filename is " " or null thats why getting that error.

Agent__007 4-Jan-13 6:25am

I suspect you didnot see my updated answer, please check this: I have updated my line as:
Dim fileName As String = "new.pdf"

[no name] 4-Jan-13 7:13am

at first i gave the file name but that time also it was only creating the new.pdf, not creating files after that..(new_1,new_2,....)

[no name] 4-Jan-13 7:18am

@Lakshmimsridhar: Mam it's giving error for the path not for the file.please read the error properly

Lakshmimsridhar 4-Jan-13 8:06am

file is going to save in path itself sir. that path itself not coming there properly thats why giving that error