I'm trying to use the VlcDotNet library to embed a small media player into a VB.Net forms-based project.
Mainly I'm following the solution that I found here:
Display video with VlcDotNet library
except that I've had to translate from C# to VB.
Having followed the instructions to the letter, there are two lines of the code which simply aren't recognised and won't compile. Certain methods of the Vlc.DotNet.Core code simply aren't accepted as valid.
Having used NuGet to get 4 Vlc.DotNet packages (.Core, .Core.Interops, .Forms and .Wpf), my complete code (excluding the very basic design of one button and one panel) is below. The compiler won't compile it, because it says there are 2 errors.
Firstly, "Type Vlc.DotNet.Core.Medias.MediaBase is not defined" (for the 'Dim newMedia as...' line)
Secondly, "'Media' is not a member of 'Vlc.DotNet.Forms.Control" (for the '.Media = newMedia' line)
Almost all the methods of the VlcControl are present, but I can't see why certain elements, such as the Media method, are simply not there?
Any suggestions would be extremely welcome.
Thanks
Imports Vlc.DotNet.Core
Imports Vlc.DotNet.Core.Interops
Imports Vlc.DotNet.Forms
Imports Vlc.DotNet.Wpf
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim player As New Vlc.DotNet.Forms.VlcControl
Panel1.Controls.Add(player)
With player
.BackColor = Color.Blue
.ImeMode = Windows.Forms.ImeMode.NoControl
.Location = New System.Drawing.Point(0, 0)
.Name = "test"
.Rate = 0.0F
.Size = Panel1.Size
Dim newMedia As Vlc.DotNet.Core.Medias.MediaBase = New Vlc.DotNet.Core.Medias.PathMedia("E:\TempTest.mov")
.Media = newMedia
.Play()
End With
End Sub
End Class
I had try to convert out from C# and below are the new library files using method:
Public myvlc As New VlcControl
myvlc.Dock = DockStyle.None
myvlc.Size = New Size(myscreen.Bounds.Width, myscreen.Bounds.Height)
myvlc.Location = New Point(0, 0)
Me.Controls.Add(myvlc)
AddHandler myvlc.VlcLibDirectoryNeeded, AddressOf LibNeeded
Private Sub LibNeeded(ByVal Sender As Object, ByVal e As VlcLibDirectoryNeededEventArgs)
e.VlcLibDirectory = New IO.DirectoryInfo("C:\lib\x86\")
End Sub
Please download the Video Codec lib from the same website where you get the vlc.dotnet.
Related
I have written some code to create a PictureBox every time the code runs, which works fine.
Public Sub BtnHit_Click(sender As Object, e As EventArgs) Handles BtnHit.Click
Dim PicBoxNewCard As New PictureBox
PicBoxNewCard.Width = 114
PicBoxNewCard.Height = 166
PicBoxNewCard.SizeMode = PictureBoxSizeMode.Zoom
DrawCard(PicBoxNewCard)
Me.Controls.Add(PicBoxNewCard)
PicBoxNewCard.Location = New Point((257 + (57 * DrawnCardCounter)), 349)
But I want to be able to delete these created PictureBoxes by pressing a button, which would be in a different sub to the one that creates the Boxes.
I have googled around and have found references to creating Classes, Panels etc and have not had any success. I have found the exact code that I need to make it work, (Me.Controls.Remove(PicBoxNewCard)) but it only seems to work when executed in the same Sub.
Set the Name or Tag property and use that later when searching for the PictureBox to remove.
PicBoxNewCard.Name = $"Card{DrawnCardCounter}"
Private Sub RemoveButton_Click(sender As Object, e As EventArgs) Handles RemoveButton.Click
RemoveCardPicBox(10)
End Sub
Private Sub RemoveCardPicBox(CardNumber As Integer)
Dim delpicBox As PictureBox = Me.Controls.OfType(Of PictureBox).Where(Function(x) x.Name = $"Card{CardNumber}").FirstOrDefault
If Not delpicBox Is Nothing Then
Me.Controls.Remove(delpicBox)
End If
End Sub
I'm new to this site and also a newbee in vb.net, I created a simple form in vb.net, a form with 3 buttons, by clicking Button1 Species1.txt is created, and by clicking Button2 the lines in Species1.txt are copied in a String Array called astSpecies(), and by Button3 the String Array is copied in a new file, named Species2.txt, below is the code.
Public Class Form4
Dim astSpecies() As String
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim myStreamWriter = New StreamWriter("C:\Users\Administrator\Documents\species1.txt", True)
myStreamWriter.WriteLine("Pagasius pangasius")
myStreamWriter.WriteLine("Meretrix lyrata")
myStreamWriter.WriteLine("Psetta maxima")
myStreamWriter.WriteLine("Nephrops norvegicus")
myStreamWriter.WriteLine("Homarus americanus")
myStreamWriter.WriteLine("Procambarus clarkii")
myStreamWriter.Close()
MsgBox("list complete")
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim myStreamReader = New StreamReader("C:\Users\Administrator\Documents\species1.txt")
Dim i As Integer
Dim stOutput As String
stOutput = ""
Do While Not myStreamReader.EndOfStream
astSpecies(i) = myStreamReader.ReadLine
stOutput = stOutput & astSpecies(i) & vbNewLine
i = i + 1
Loop
myStreamReader.Close()
MsgBox(stOutput)
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
Dim myStreamWriter = New StreamWriter("C:\Users\Administrator\Documents\species2.txt", True)
Dim o As Integer
Do While o <= astSpecies.Length
myStreamWriter.WriteLine(astSpecies(o))
o = o + 1
Loop
myStreamWriter.Close()
End Sub
End Class
First of all, you should make a few settings when it comes to VB.Net. 1.) set Option Strict to On 2.) remove the VB6 namespace. VB6 is the old Visual Basic. There are many functions in this that are inefficient from today's perspective. So please do not write MsgBox() but MessageBox.Show("").
(If you still need control characters such as NewLine or Tab, you can set a selective reference with Imports Microsoft.VisualBasic.ControlChars. Sounds contradictory, but it is useful, because why should you also write ChrW(9), it is not legible.)
I quickly started a project myself and wrote whatever you wanted.
I still don't quite understand why you first write things into a text file, then read them out, and then write that into a second text file – I want to say: where do the strings originally come from? The strings must have been there already? Anyway, I filled a List(of String) in the Button2_Click procedure. This has the advantage that you don't have to know in advance how many strings are coming, and you can sort them later and so on ...
You should also discard all Writers when you no longer need them. So use Using. Otherwise it can happen that the written files are not discarded and you can no longer edit the file.
Imports Microsoft.VisualBasic.ControlChars
Imports Microsoft.WindowsAPICodePack.Dialogs
Public NotInheritable Class FormMain
Private Path As String = ""
Private allLines As New List(Of String)
Private Sub FormMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.BackColor = Color.FromArgb(161, 181, 165)
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Using OFolderD As New CommonOpenFileDialog
OFolderD.Title = "Ordner auswählen"
OFolderD.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
OFolderD.IsFolderPicker = True
If OFolderD.ShowDialog() = CommonFileDialogResult.Ok Then
Path = OFolderD.FileName
Else
Return
End If
End Using
Path &= "\Data.txt"
Using txtfile As System.IO.StreamWriter = My.Computer.FileSystem.OpenTextFileWriter(Path, True)
txtfile.WriteLine("Pagasius pangasius")
txtfile.WriteLine("Meretrix lyrata")
txtfile.WriteLine("Psetta maxima")
txtfile.WriteLine("Nephrops norvegicus")
txtfile.WriteLine("Homarus americanus")
txtfile.WriteLine("Procambarus clarkii")
txtfile.Close()
End Using
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
'read all Text
Dim RAT() As String = System.IO.File.ReadAllLines(Path, System.Text.Encoding.UTF8)
If RAT.Length = 0 OrElse RAT.Length = 1 Then
MessageBox.Show("The File only contains 0 or 1 characters.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Hand)
Return
End If
allLines.AddRange(RAT)
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
Dim Pfad_txt As String = Path.Substring(0, Path.LastIndexOf("\"c)) & "\Data2.txt"
Using txtfile As System.IO.StreamWriter = My.Computer.FileSystem.OpenTextFileWriter(Pfad_txt, True)
For Each Line As String In allLines
txtfile.WriteLine(Line)
Next
txtfile.Close()
End Using
End Sub
End Class
By the way: I use a FolderBrowserDialog in the Button1_Click procedure. This should be done so that the program also runs properly on other PCs. In order to be able to use the FBD, you have to download Microsoft.WindowsAPICodePack.Dialogs in Visual Studio's own Nuget package manager.
how to set Option Strict to On
How to uncheck VB6.
how to install FolderBrowserDialog in Visual Studio
Button1
If you want to use a StreamWriter it should be disposed. Classes in the .net Framework that have a Dispose method may use resources outside of the framework which need to be cleaned up. The classes shield you from these details by provided a Dispose method which must be called to properly do the clean up. Normally this is done with Using blocks.
I used a string builder which saves creating and throwing away a string each time you change the string. You may have heard that strings are immutable (cannot be changed). The StringBuilder class gets around this limitation. It is worth using if you have many changes to your string.
The File class is a .net class that you can use to read or write files. It is not as flexible as the stream classes but it is very easy to use.
Button 2
When you declared your Array, you declared an array with no elements. You cannot add elements to an array with no space for them. As Daniel pointed out, you can use the .net class List(Of T) The T stands for Type. This is very good suggestion when you don't know the number of elements in advance. I stuck with the array idea by assigning the array returned by File.ReadAllLines to the lines variable.
You get the same result by simply reading all the text and displaying it.
Button 3
Again I used the File class here which allows you to complete your task in a single line of code. Using 2 parameters for the String.Join method, the separator string and the array to join, we reproduce the original file.
Private SpeciesPath As String = "C:\Users\maryo\Documents\species1.txt"
Private lines As String()
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim sb As New StringBuilder
sb.AppendLine("Pagasius pangasius")
sb.AppendLine("Meretrix lyrata")
sb.AppendLine("Psetta maxima")
sb.AppendLine("Nephrops norvegicus")
sb.AppendLine("Homarus americanus")
sb.AppendLine("Procambarus clarkii")
File.WriteAllText(SpeciesPath, sb.ToString)
MsgBox("list complete")
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
lines = File.ReadAllLines(SpeciesPath)
MessageBox.Show(String.Join(Environment.NewLine, lines))
'OR
MessageBox.Show(File.ReadAllText(SpeciesPath))
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
File.WriteAllLines("C:\Users\maryo\Documents\species2.txt", lines))
End Sub
I want to set a background image of windows form using code. and I am doing so using this code. Code in the form's page load event:
Me.Panel2.BackgroundImage = Image.FromFile(My.Settings.BGimage.ToString)
and code of button's click event.
Dim BGimage As Object
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles btnselect.Click
If OpenFileDialog1.ShowDialog() = DialogResult.OK Then
BGimage = OpenFileDialog1.FileName.ToString
TextBox1.Text = OpenFileDialog1.FileName.ToString
End If
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles btnset.Click
Me.Panel1.BackgroundImage = Image.FromFile(OpenFileDialog1.FileName)
My.Settings.BGimage = BGimage
Wait.Show()
End Sub
But there are more another namespaces in the form and these are,
Imports iTextSharp
Imports iTextSharp.text
Imports iTextSharp.text.pdf
So, I am facing error in the page load event code, and error is "FromFile is not a member of 'iTextSharp.text.Image' "
I am getting a blue squiggly line under "Image.FromFile" in the page load event code. and as compile error.
So, I stuck here. I can't understand what to do.
Add appropriate namespace, like this:
Me.Panel2.BackgroundImage = System.Drawing.Image.FromFile(My.Settings.BGimage.ToString)
I'm trying to use the WebKit-component (http://www.webkit.org/) in VB with the help of Visual Studio 2008.
This is running without problems, except for two following two issues:
1. Hints/Tooltips are not shown (e.g. as there usually will appear one if you stay with the mouse over the Google-logo)
2. If there's a popup-window, I don't know how to get the new desired URL.
I'm already working a few days on this matter and couldn't find any solution yet :(
Maybe you know a solution to this problem.
Cheers
Markus G.
P.S.: If you need more than the following Source Code to analyze the problem, then let me know ...
Source Code Form1
Imports System.IO
Imports WebKit
Public Class frmMain
Private _url As String
Private _mode As String
Private _popupUrl As String
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
On Error Resume Next
Dim bLogging As Boolean
setWindowAndBrowserSettings()
_url = "http://www.google.com"
browserComp.Navigate(_url)
End Sub
Private Sub setWindowAndBrowserSettings()
Me.Text = "Test - Browser"
Me.WindowState = FormWindowState.Maximized
browserComp.Dock = DockStyle.Fill
browserComp.Visible = True
End Sub
Private Sub browserComp_NewWindowCreated(ByVal sender As Object, ByVal e As WebKit.NewWindowCreatedEventArgs) Handles browserComp.NewWindowCreated
'frmPopup.WindowState = FormWindowState.Maximized
frmPopup.Text = "ixserv - POPUP"
frmPopup.popup.Navigate(_popupUrl)
frmPopup.Show()
End Sub
Private Sub browserComp_NewWindowRequest(ByVal sender As Object, ByVal e As WebKit.NewWindowRequestEventArgs) Handles browserComp.NewWindowRequest
e.Cancel = False
_popupUrl = browserComp.Url.ToString ' WHERE can I get the clicked URL? This is the old one of the remaining window
End Sub
End Class
Code Form2
Public Class frmPopup
End Class
Following popup/new-Window-Create-function works for me:
Private Sub browserComp_NewWindowCreated(ByVal sender As Object, ByVal e As WebKit.NewWindowCreatedEventArgs) Handles browserComp.NewWindowCreated
frmPopup.Text = "POPUP"
Dim popupBrowser As WebKit.WebKitBrowser
popupBrowser = e.WebKitBrowser
frmPopup.Controls.Add(popupBrowser)
frmPopup.Show()
End Sub
whereas frmPopup is a new form.
Before I tried this I already added the Webkit-component to the new form, which might had been the problem. I assume, the trick is, to create a new WebKitBrower-element that is directly connected to the argument e.WebkitBrowser instead of overloading an existing webkitbrowser-component in the form. Don't ask me for reasons for this now (I really don't know) :P
Oh, I should add that I used the Webkit.NET component. The same trick works also for the OpenWebkitSharp-wrapper
The hint-problem still remains ...
I am new to Visual Basic.NET and I am just playing around with it. I have a book that tells me how to read from a file but not how to write to the file with a button click. All I have is a button and a textbox named fullNameBox. When I click the button it gives me an unhandled exception error. Here is my code:
Public Class Form1
Sub outputFile()
Dim oWrite As System.IO.StreamWriter
oWrite = System.IO.File.CreateText("C:\sample.txt")
oWrite.WriteLine(fullNameBox.Text)
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
outputFile()
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
End Class
Have you tried stepping through your application to see where the error is? With a quick glance, it looks like you might need to use System.IO.File on the fourth line (oWrite = IO.File...) instead of just IO, but I haven't tried to run it.
Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
SaveFileDialog1.FileName = ""
SaveFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
SaveFileDialog1.ShowDialog()
If SaveFileDialog1.FileName.Trim.Length <> 0 Then
Dim fs As New FileStream(SaveFileDialog1.FileName.Trim, FileMode.Create)
Dim sr As New StreamWriter(fs)
sr.Write(TextBox1.Text)
fs.Flush()
sr.Close()
fs.Close()
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
OpenFileDialog1.FileName = ""
OpenFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
OpenFileDialog1.ShowDialog()
If OpenFileDialog1.FileName.Trim.Length <> 0 Then
Dim fs As New FileStream(OpenFileDialog1.FileName.Trim, FileMode.Open)
Dim sw As New StreamReader(fs)
TextBox1.Text = sw.ReadToEnd
fs.Flush()
sw.Close()
fs.Close()
End If
End Sub
End Class
this is a complete functional program if you want, you just need to drag drop a textbox, openfiledialog, and a savefiledialog.
feel free to play around with the code.
enjoy
by the way, the problem in your code is that you "must" close filestream when your done using it, doing so will release any resource such as sockets and file handles.
The .net framework is a very powerful framework. In the same way (however) it has easy and convenient methods for simple tasks. Most individuals tend to complicate things in order to display knowledge. But less code = less processing = faster and more efficient application (sometimes) so the large above method may not be suitable. Along with that, the above mentioned method would be better off written as a sub or if returning something then a function.
My.Computer.FileSystem.WriteAllText("File As String", "TextAsString", Append as Boolean)
A general Example would be
My.Computer.FileSystem.WriteAllText("C:\text.text", "this is what I would like to add", False)
this is what I would like to add
can be changed to the current text of a field as well.
so a more specific example would be
My.Computer.FileSystem.WriteAllText("C:\text.text", fullNameBox.text, True)
If you would like to understand the append part of the code
By setting append = true you are allowing your application to write the text at the end of file, leaving the rest of the text already in the file intact.
By setting append = false you will be removing and replacing all the text in the existing file with the new text
If you don't feel like writing that part of the code (though it is small) you could create a sub to handle it, however that method would be slightly different, just for etiquette. functionality would remain similar. (Using StreamWriter)
Private Sub WriteText()
Dim objWriter As New System.IO.StreamWriter("file.txt", append as boolean)
objWriter.WriteLine(textboxname.Text)
objWriter.Close()
End Sub
The Specific Example would be
Private Sub WriteText()
Dim objWriter As New System.IO.StreamWriter("file.txt", False)
objWriter.WriteLine(fullnamebox.Text)
objWriter.Close()
End Sub
then under the button_click event call:
writetext()
You can take this a step further as well. If you would like to create a more advabced Sub to handle any textbox and file.
Lets say you plan on having multiple separate files and multiple fields for each file (though there is a MUCH cleaner more elegant method) you could create a function. {i'll explain the concept behind the function as thoroughly as possible for this example}
below is a more advanced sub demonstration for your above request
Private Sub WriteText(Filename As String, app As Boolean, text As String)
Dim objWriter As New System.IO.StreamWriter(Filename, app)
objWriter.WriteLine(text)
objWriter.Close()
End Sub
What this does is allows us to (on the same form - if you need it global we can discuss that another time, it's not much more complex at all) call the function and input the information as needed.
Sub Use -> General Sample
WriteText(Filename As String, app As Boolean)
Sub Use -> Specific Sample
WriteText("C:\text.txt, False, fullnamebox.text)
But the best part about this method is you can change that to be anything as you need it.
Let's say you have Two Buttons* and **Two Boxes you can have the button_event for the first button trigger the above code and the second button trigger a different code.
Example
WriteText("C:\text2.txt, False, halfnamebox.text)
The best part about creating your own functions and subs are Control I won't get into it, because it will be off topic, but you could check to be sure the textbox has text first before writing the file. This will protect the files integrity.
Hope this helps!
Richard Sites.