I am getting an exception when running the following code.
Public Function getSongs() As Song()
' Dim dir As New DirectoryInfo(Application.ExecutablePath)
Dim dir As New DirectoryInfo(directory)
Dim songsInDir() As Song = Nothing
Dim i As Integer = 0
For Each file As FileInfo In dir.GetFiles()
'only read ".mp3" files
If file.Extension = ".mp3" Then
songsInDir(i) = New Song(file.Name)
i = +i
End If
Next
Return songsInDir
End Function
I get an error on line:
songsInDir(i) = New Song(file.Name)
I get an uncaught exception that says:
"Object reference not set to an instance of an object."
The song object has a:
Public Sub new(By Val filename as String)
... sub that sets a variable and retrieves file info (this code works)
Any help would be appreciated!
Try using a list:
Public Function getSongs() As Song()
Dim dir As New DirectoryInfo(directory)
Dim songsInDir() As New List(of Song)
For Each file As FileInfo In dir.GetFiles()
'only read ".mp3" files
If file.Extension = ".mp3" Then
songsInDir.Add(New Song(file.Name)
End If
Next
Return songsInDir.ToArray()
End Function
Your problem is that arrays need a size when they're initialized and setting it to Nothing gives you exactly that. Give the array a size and don't set it to Nothing. Also, there's a much cleaner way to do this.
Public Function getSongs() As Song()
Dim songFiles As String() = Directory.GetFiles(directory, "*.mp3")
Dim songsInDir(songFiles.Length) As Song
Dim i As Integer = 0
For Each file As String In songFiles
songsInDir(i) = New Song(Path.GetFileName(file))
i = +i
Next
Return songsInDir
End Function
You should specify the array size
Dim i as Integer = dir.GetFiles().count or dir.FilesCount()
Dim songsInDir(i) As Song = Nothing
or you can use dynamic array
put this line inside your for loop
ReDim Preserve songsInDir(i)
Related
I am trying to add content to my resx files, via the AddResource(myval.Key, myval.Value) method. It works perfectly, but the only thing that bothers me is that stupid Designer file. Can I force it to update according to its resx file?
This is how I have added my strings to the resx file:
For Each entry In list
Dim resxList As List(Of KeyValuePair(Of String, String)) = New List(Of KeyValuePair(Of String, String))
Dim reader = New System.Resources.ResXResourceReader(entry.Key)
Dim node = reader.GetEnumerator()
While node.MoveNext()
resxList.Add(New KeyValuePair(Of String, String)(node.Key.ToString(), node.Value.ToString()))
End While
reader.Close()
Using fs As System.IO.FileStream = New System.IO.FileStream(entry.Key, System.IO.FileMode.Open)
Dim resx As System.Resources.ResXResourceWriter = New System.Resources.ResXResourceWriter(fs)
Using resx
If resxList.Count <> 0 Then
For Each r In resxList
resx.AddResource(r.Key, r.Value)
Next
End If
For Each myval In entry.Value
resx.AddResource(myval.Key, myval.Value)
Next
resx.Generate()
resx.Close()
End Using
fs.Close()
End Using
Next
I have found a solution on: https://github.com/thomaslevesque/AutoRunCustomTool
This is the code I extracted for my pruposes:
Private Function RunCustomToolSuccess(path As String) As Boolean
Dim targetItem As ProjectItem = _applicationObject.Solution.FindProjectItem(path)
If targetItem Is Nothing Then Return False
Dim targetCustomTool As String = CStr(GetPropertyValue(targetItem, "CustomTool"))
If String.IsNullOrEmpty(targetCustomTool) Then Return False
Dim vsTargetItem = targetItem.Object
vsTargetItem.RunCustomTool()
Return True
End Function
Private Shared Function GetPropertyValue(ByVal item As ProjectItem, ByVal index As Object) As Object
Try
Dim prop = item.Properties.Item(index)
If prop IsNot Nothing Then Return prop.Value
Catch __unusedArgumentException1__ As ArgumentException
End Try
Return Nothing
End Function
Currently the line of code looks like this:
Dim files() As String = System.IO.Directory.GetFiles(path, filehead & ".*.*.fsi")
Dim seqfsi() As Integer
ReDim seqfsi(files.GetUpperBound(0))
Dim args() As String
Dim file As String = ""
For Each file In files
args = Split(file, ".")
If args.Length = 4 Then
seqfsi(System.Array.IndexOf(files, file)) = CInt(args(args.GetUpperBound(0) - 1))
End If
The problem is, sometimes, in my case, the path looks something like:
C:\Users\c.brummett\Downloads
and the split causes a split in the username. How can I avoid this problem but still split by periods? I'm sorry I don't how to make this more relatable.
My idea was to use a DirectoryInfo and do something like:
Dim di As DirectoryInfo
di = New DirectoryInfo(path)
Dim files() As String = di.GetFiles(filehead & ".*.*.fsi")
Edit: The problem with this second bit of code, is that it returns the error
Value of type '1-dimensional array of System.IO.FileInfo' cannot be converted to '1-> dimensional array of String' because 'System.IO.FileInfo' is not derived from 'String'.`
You can forget about getting an array of file names (you don't need that anyway) and iterate on the array of FileInfo:
Dim files() As FileInfo = New DirectoryInfo(path).GetFiles(filehead & ".*.*.fsi")
Dim seqfsi() As Integer
ReDim seqfsi(files.GetUpperBound(0))
Dim args() As String
For Each file As FileInfo In files
args = Split(file.Name, ".")
If args.Length = 4 Then
seqfsi(System.Array.IndexOf(files, file)) = CInt(args(args.GetUpperBound(0) - 1))
End If
Note AllDirectories and change in the line doing the splitting. I didn't look at your array structure stuff.
Dim files() As String = System.IO.Directory.GetFiles("C:\temp", "*.doc", IO.SearchOption.AllDirectories)
Dim seqfsi() As Integer
ReDim seqfsi(files.GetUpperBound(0))
Dim args() As String
Dim file As String = ""
For Each file In files
args = file.Substring(file.LastIndexOf("\") + 1).Split(".")
If args.Length = 4 Then
seqfsi(System.Array.IndexOf(files, file)) = CInt(args(args.GetUpperBound(0) - 1))
End If
Next file
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 5 years ago.
Hi all i have been trying to search a specified directory and all sub directories for all files that have the specified file extension. However the inbuilt command is useless as it errors up and dies if you dont have access to a directory. So here's what i have at the moment:
Private Function dirSearch(ByVal path As String, Optional ByVal searchpattern As String = ".exe") As String()
Dim di As New DirectoryInfo(path)
Dim fi As FileInfo
Dim filelist() As String
Dim i As Integer = 0
For Each fi In di.GetFiles
If System.IO.Path.GetExtension(fi.FullName).ToLower = searchpattern Then
filelist(i) = fi.FullName
i += 1
End If
Next
Return filelist
End Function
However i get an "System.NullReferenceException: Object reference not set to an instance of an object." when i try to access the data stored inside the filelist string array.
Any idea's on what im doing wrong?
You didn't instantiate the Dim filelist() As String array. Try di.GetFiles(searchPattern)
Dim files() as FileInfo = di.GetFiles(searchPattern)
Use static method Directory.GetFiles that returns an array string
Dim files = Directory.GetFiles(Path,searchPattern,searchOption)
Demo:
Dim files() As String
files = Directory.GetFiles(path, "*.exe", SearchOption.TopDirectoryOnly)
For Each FileName As String In files
Console.WriteLine(FileName)
Next
Recursive directory traversal:
Sub Main()
Dim path = "c:\jam"
Dim fileList As New List(Of String)
GetAllAccessibleFiles(path, fileList)
'Convert List<T> to string array if you want
Dim files As String() = fileList.ToArray
For Each s As String In fileList
Console.WriteLine(s)
Next
End Sub
Sub GetAllAccessibleFiles(path As String, filelist As List(Of String))
For Each file As String In Directory.GetFiles(path, "*.*")
filelist.Add(file)
Next
For Each dir As String In Directory.GetDirectories(path)
Try
GetAllAccessibleFiles(dir, filelist)
Catch ex As Exception
End Try
Next
End Sub
Use System.IO.Directory.EnumerateFiles method and pass SearchOption.AllDirectories in to traverse the tree using a specific search pattern. Here is an example:
foreach (var e in Directory.EnumerateFiles("C:\\windows", "*.dll", SearchOption.AllDirectories))
{
Console.WriteLine(e);
}
I have a string like
Query_1,ab563372363_C/R,100.00,249,0,0,1,249,1,249,1e-132, 460
Query_1,ab563372356_C/R,99.60,249,1,0,1,249,1,249,5e-131, 455
in a file
in two separate lines. I am reading it from the textbox. I have to output ab563372363_C/R and ab563372356_C/R in a text box. I am trying to use the split function for that but its not working..
Dim splitString as Array
results = "test.txt"
Dim FileText As String = IO.File.ReadAllText(results) 'reads the above contents from file
splitString = Split(FileText, ",", 14)
TextBox2.text = splitString(1) & splitString(13)
for the above code, it just prints the whole thing.. What's wrong?
Try this
Private Function GetRequiredText() As List(Of String)
Dim requiredStringList As New List(Of String)
Dim file = "test.txt"
If FileIO.FileSystem.FileExists(file) Then
Dim reader As System.IO.StreamReader = System.IO.File.OpenText(file)
Dim line As String = reader.ReadLine()
While line IsNot Nothing
requiredStringList.Add(line.Split(",")(1))
line = reader.ReadLine()
End While
reader.Close()
reader.Dispose()
End If
Return requiredStringList
End Function
This will read the file line by line and add the item you require to a list of strings which will be returned by the function.
Returning a List(Of String) may be overkill, but it's quite simple to illustrate and to work with.
You can then iterate through the list and do what you need with the contents of the list.
Comments welcome!!
Also this might work...
Dim query = From lines In System.IO.File.ReadAllLines(file) _
Select lines.Split(",")(1)
this will return an IEnumerable(Of String)
Enjoy
First
Since you are reading the whole text, your FileText would be ending like this:
Query_1,ab563372363_C/R,100.00,249,0,0,1,249,1,249,1e-132,460
\r\n
Query_1,ab563372356_C/R,99.60,249,1,0,1,249,1,249,5e-131, 455
So when you are referencing to your splitStringwith those indexes (1, 13) your result might probably be wrong.
Second
Try to specify what kind of type your array is, Dim splitString as Array should be Dim splitString As String()
Third
Make your code more readable/maintainable and easy to edit (not only for you, but others)
The Code
Private const FirstIndex = 1
Private const SecondIndex = 12
Sub Main
Dim myDelimiter As Char
Dim myString As String
Dim mySplit As String()
Dim myResult1 As String
Dim myResult2 As String
myDelimiter = ","
myString += "Query_1,ab563372363_C/R,100.00,249,0,0,1,249,1,249,1e-132, 460"
myString += "Query_1,ab563372356_C/R,99.60,249,1,0,1,249,1,249,5e-131, 455"
mySplit = myString.Split(myDelimiter)
myResult1 = mySplit(FirstIndex)
myResult2 = mySplit(SecondIndex)
Console.WriteLine(myResult1)
Console.WriteLine(myResult2)
End Sub
I am building a search engine in vb.net which would have to search for a word entered by the user in 40 text files within the project directory.
It should return the results as the total number of matches (text files) and the number of times this word is in each file. Any suggestions for a start would be grateful.
Regards.
get a list of the files in the directory with something like: Directory.GetFiles(ProjectDir, "*.*"), then read each file in the list like this:
Dim sr As StreamReader = New StreamReader(fileName)
Dim line As String
Do
line = sr.ReadLine()
scan the line and count
Loop Until line Is Nothing
sr.Close()
Try this code, in a console application, not only could find a word
even you can get the results using a RegEx Expression.
Class TextFileInfo
Public File As System.IO.FileInfo
public Count As Integer
public FileText As String
public ItMatch as Boolean = False
Sub New (FileFullName as String,WordPattern as String)
File = new System.IO.FileInfo(FileFullName)
Using Fs As System.IO.StreamReader(File.FullName)
FileText = Fs.ReadToEnd()'//===>Read Text
End Using
Count = _CountWords(WordPattern,FileText)
ItMatch = Count > 0
End Sub
Public Sub DisplayInfo()
System.Console.WriteLine("File Name:" + File.Name)
System.Console.WriteLine("Matched Times:" & Count)
End Sub
Private Function _CountWords(Word As String,Text As String) as Integer
Dim RegEx as System.Text.RegularExpressions.Regex(Word)
return RegEx.Matches(Text).Count'//===>Returns how many times this word match in the Text
End Fuction
End Class
Public Function SearchEngine(PatternWord As String,RootDirectory As String) List(Of TextFileInfo)
Dim MatchedFiles As New List(Of TextFileInfo)
Dim RootDir As New System.IO.DirectoryInfo(RootDirectory)
For Each iTextFile as System.IO.FileInfo In RootDir.GetFiles("*.txt")
'//===>Create a object of TextFileInfo and check if the file contains the word
Dim iMatchFile as New TextFileInfo(iTextFiles.FullName,PatternWord)
If iMatchFile.ItMatch Then
'//===>Add the object to the list if it has been matches
MatchedFiles.Add(iMatchFile)
End If
Loop
retur MatchedFiles '//===>Return the results of the files that has the matched word
End Function
Sub Main()
Dim SearchResults as List(Of TextFileInfo) = SearchEngine("JajajaWord","C:\TextFiles\")
For Each iSearch As TextFileInfo In SearchResults
iSearch.DisplayInfo()
Loop
End Sub