Object reference not set to an instance of an object.

[MikeParc]

HI,

I got this error above in the this code:

hFile = FindFirstFile(StartPath & "\" & File & vbNullChar, FileData)

Please help me, I'm new to .NET

Mike

 

[bassguy]

Just a quick answer, in VB.net there is no VBnullChar call
ControlChars.NullChar is listed as the Equivalent. I have never used either call sorry I cannot help any more but maybe it will point you in the right direction

bassguy

 

[MikeParc]

Well it still sais that the object reference is not set to an instance of an object.

What can I do about it...
code looks now like this:

hFile = FindFirstFile(StartPath & "\" & File & ControlChars.NullChar, FileData)color]

And it also didn't work without the ControlChars.NullChar...

Mike

 

[phunugus]

Make sure the api declaration is right.

Declare Function FindFirstFile Lib "kernel32" Alias "FindFirstFileA" (ByVal lpFileName As String, ByRef lpFindFileData As WIN32_FIND_DATA) As Integer

Make sure the WIN32_FIND_DATA is set to an instance by creating a sub new() for it and calling it.

Dim wfd As New WIN32_FIND_DATA

if you need more help. seanrdittmar at hotmail.com

 

[phunugus]

By the way, you should really use:

dim files() As String = IO.Directory.GetFiles(path)

if you need additional info on a file, you can use:

Dim fi As New IO.FileInfo(path)

hope this helps

 

[MikeParc]

Hey thanx, that's pretty good...but would be good to know, HOW MANY Files are in that folder (path) because I need to display them in a ListView...and I think that only works with this:


for i = 0 To NumberOfFiles
ListView1.Items.Add(files(i))
next


MIke

 

[woyler]

you could use:
Dim dirRoot As New DirectoryInfo("YourPath&quot
Dim myFile As FileInfo

For Each myFile In dirRoot.GetFiles("*.*&quot
yourListView.Items.Add(myFile.Name)
Next

 

[phunugus]

thats wrong, bro.

Use this instead:

dim fle As String

For Each fle In Directory.GetFiles("yourpath&quot
yourListView.Items.Add(Path.GetFileName(fle))

Next fle

 

[woyler]

funny. works fine in the application I use it in.

 

[MikeParc]

hi,

works perfectly...but, how can I display the fileinfo in another column ??? the filenames are all displayed in the first column and I need to display the fileinfo in another one...

Mike

 

[woyler]

As far as the file attributes, you can use something like myFile.LastWriteTime.Date Almost all attributes are direct properties of the FileInfo variable.

 

[MikeParc]

well that's not exactly what I meant, I need to know how to display the FileInfo in another Column of the ListView

Mike

 

[phunugus]

Dim lvi As New ListViewItem
With lvi
.Text = filename
.SubItems.Add("otherinfo&quot
End With

YourListView.Items.Add(lvi)


Does that answer your quandry?

 

[MikeParc]

hi,

works almost as I need it....it places the "otherinfo" in the second column, BUT it places it in the next line...

this is the whole function I'm using...

Dim fle As String
Dim filename As String
Dim lvi As New ListViewItem()

For Each fle In Directory.GetFiles(strPathMedia)
lvMedia.Items.Add(Path.GetFileName(fle))

With lvi
.Text = filename
.SubItems.Add(Path.GetExtension(fle))
End With

lvMedia.Items.Add(lvi)

Next fle


Mike

 

[phunugus]

i dont understand what you want it to do...