How To Create A Stream Writer Class
Jun 24, 2011
i am creating a program which scans and saves images. in my program i have the option to save images and with each image i save it gets its own number for example: file1, file2, file3, file4 and so on. the only problem i have is getting the prgram to remember where it left off so it carry's on the number. my understanding is that i need to create some sort of stream writer or file stream class for this proccess to work. so it save's the last image number i was on, and carrys it on next time i open the program up again. and i also need it to re-write the new image number its on for next time. so i need to write and read the text file (.txt) and write it again if you catch my drift? i have a book to help but the wording in it is so confusing at the min, i m lost where to start.
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Jul 2, 2010
I'm using the stream writer to make a text file and write to it.I'm trying to get all the items from the listbox2 and save them to a text file called log.txt.The funny part is that its not giving me a ex.message.Do you see any error.[code]...
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Jul 9, 2010
I want to open a file with a stream writer. Delete it contains and write random data to it. And finally delete the file.
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Aug 22, 2009
I am having a strange issue when using the StreamWriter where I am getting some strange charachers in my text file when reading data from a query string.
[Code]...
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Apr 30, 2009
The bigger problem is that I can't seem to get everything involving using stream writer and reader working. If I start of with a .txt file already correctly formatted then I can display it in the list box. But adding data during run time is not proving successful.
[Code]....
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Nov 30, 2009
I have a dataGridView and tied it to a button that saves every time you click it. and every time you click it, I want to write a line to a txtfile that displays how many records were changed and the date that they were changed. Everything works fine but every time a save has been made it over write the previous entry on the text file. Here is some of the code.
If changes > 0 Then
MessageBox.Show(changes & " changed rows were stored in the database.") ' changes shows how many entries were changed
swDate.WriteLine(changes & " record changes on " & entryDate) 'entryDate is formated as date with value of "Now"
Else
[code]....
I am getting the right results in the text file except it over writes previous entry's so there is only one entry saved in the text file at any given time. I want it to keep building the text file so every time something is streamWrited the previous things in the text file stay there and it add to it. Looking at my problem I cant really justify or implement a For Each..Next or a Do While..Loop. My vb knowledge is limited so go easy on me.
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Apr 21, 2009
What is the code to make a stream writer remove a certain line from a file stream?
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Apr 28, 2011
I'm trying to setup a simple app that reads a file and then writes the contents to another file using OpenFileDialog and SaveFileDialog. Looking at the debbugger it looks like it's reading fine, I can see the data I want written. Towards the end of my code I get the following error message:"Illegal characters in path". I've researched this error. I'm not using any illegal characters such as /\? etc and the pathname contains all alpha characters. I'm pulling the test file from the C drive and trying to save it there as well.
Path: C:\Test.csv
My code:
Private Sub btnAppendData_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAppendData.Click
Dim Result As DialogResult
Dim FileContents As String
[Code] .....
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Jan 27, 2009
I am trying to make my application read data from a file. Then save the data back. However I keep getting an error which says the file is still open so cannot be edited. I also read that there is an issue with the streamreader and streamwriter do not close the program straight away. I was wondering if anyone had a way around this or any alternative ideas. Heres my code so far!
[Code]...
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Apr 28, 2009
I am new to Visual Basics and I am using Visual Basic 2008 express. I have been using video tutorial on line to learn VB and they are great in explaining what is happening the code vs. just looking at code. I think from what little I can find I would be using StreamWriter WriteLine and StreamReader readLine .I am using a couple of forms. I am looking for simple basic code to use a form as a way of modifying timer intervals and store the values in a single text file on separate lines.
Description:
Form1: will contain the main code that will run. It will contain some timers. I want the timers to look in a text file for their intervals. Each timer would be on a different line.
Example:
Timer1 interval would be located on line 3
Timer2 interval would be located on line 6
Timer3 interval would be located on line 20
Form2: will contain 3 textboxes. This is where when I load form2 I will also read the same values from the text file to preload the text boxes. I will now be able to change the timer intervals as needed and press a button to update the text file. The update button will also reload the new timer settings on Form1. This is very similar to how a CNC Machine works with Parameter settings. This can be useful for storing many different settings for a form that a user can modify and be stored and reloaded next time the program runs.
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Jun 11, 2012
As discribed on this MSDN pageWhat would be the PHP equivalent? Is it even possible to do the three things listed on that page under remarks Streams involve three fundamental operations:You can read from streams. Reading is the transfer of data from astream into a data structure, such as an array of bytes.You can write to streams. Writing is the transfer of data from a datastructure into a stream.Streams can support seeking. Seeking is the querying and modifying ofthe current position within a stream. Seek capability depends on thekind of backing store a stream has. For example, network streams haveno unified concept of a current position, and therefore typically donot support seeking.
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Feb 7, 2011
why this code doesn't work:[code]....
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Mar 1, 2012
I have a problem with the filereader class (i think). My program has server/client interaction and the client reads from a text file, sends the data to the server. The problem is, the client is sending the last line of the text file twice, so for example I use test data in the text file such as:
Test data 1
Test data 2
Test data 3
The server will receive:
Test data 1
Test data 2
Test data 3
Test data 3
Here is my code, I have a feeling it is to do with the filereader.endofstream loop.
Private Sub readLine()
Dim filePath As String = ("D:outputLog.txt")
Dim fileReader As New StreamReader(filePath)
Do
chrMessageToSend = fileReader.ReadLine()
[Code] .....
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May 21, 2012
I am working on an Examination system for a secondary school. The system captures the marks of students of the subjects they take and stores them in the database. from there, it has to compute the grades of marks for each subject that a student takes and get the position of that student in the stream and in the class.
For the gradeing part of it, I have already made it, my problem is to get the positions of students and show them on the rdlc report.
The word class and stream here, I mean;
The school has six classes, senior one/form one TO senior 6/form 6 as classes and each class(form) for example senior one has 4 streams. By streams, I mean; Students are grouped into different streams but under one class(level/form).
for example; form1 A TO Form 1 D that is one class/form secondary level. form 2 also has four streams ( form 2A, 2B, 2C, 2D) and so on. So a student can be number one in his stream but if the marks are compared to other streams of thesame level, he is number 3. it is indicated on the report as Position in Stream 1...........Class 3
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Apr 1, 2009
I'm trying to set up a CLASS to represent a data stream.This is a newbie question so if the answer is obvious, please excuse me.Several of the data items are multiples which I would normally represent as an Array element.For example, in the code below, the element SolarNameplate has up to 10 instances, so I'd like to use array notation.I get errors, and it doesn't work, so I assume I can't do it like below.
QUESTIONS : 1 - is it possible to use an array element in a class ?
2 - is there another way to achieve what I want ?
Public Class SM1PS01
Private _Projid As String '... name or number of project
Private _LogoFile As String '... file containing customer logo[code]...........
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Feb 6, 2010
Where can I find information on how to use XPS Document Writer to create a Word or Adobe document?I can print my VB2008 print document to a file, but how do i convert this file to Word?
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Oct 13, 2009
I'm trying to send a XML serialized class over a network stream
the send is working
Dim IP As Net.IPAddress = System.Net.IPAddress.Parse(IPAddress)
Dim IPE As New Net.IPEndPoint(IP, 10003)
Dim TCPClient As New Net.Sockets.TcpClient
[Code]....
I always get an error {"Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host."} The XMLFile has the xml document in it most of the time and I can go on and everything works but 1 out of every 5 times it doesn't work at all and the XMLFile contains nothing ..
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May 14, 2010
Not trying to read or convert a stream. Trying to make a MJPEG stream from a PictureBox that changes every 1 second.[code]...
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Dec 8, 2009
There is an IP web camera that I wrote a .NET class for sometime ago. It's basically a Timer implementation that pings a snapshot CGI script from the camera every five seconds. The camera itself is very rudamentary; it does not have any sort of API for me to work with, the only thing I can do programmatically (remotely) is invoke this script. The script returns a 640x480 JPEG image. Simple.
Now what I need to be able to do is take a days worth of these images, and create a "time lapse" AVI video stream out of it that will eventually be embedded into a web page. How can I do this with VB.NET?
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Jan 14, 2011
I want to create a RTSP/h264 video stream from static images, and incorporate it into my .NET application. So far I have found two possible ways to do this:
Use ffmpeg/ffserver, but I would need to compile ffserver on windows and then rely on it... and I don't necessarily want to rely on an external application
Use the LIVE555 [URL] library, but they do not have any .NET libraries, so I would need to spend some effort to make it work with the rest of my .NET application.
Can you comment on either #1, #2, or which is better. Is there a faster way to bring up a RTSP server in .NET? I do not mind putting in development time if there is a solid solution that takes time, but it would be good to have something we can work with fast, for prototyping and demos.
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May 25, 2012
in an winForm app in VS2010 win 7 compiling to x86, I try to do what Alvas.Audio seems to work. See (c# ex: [URL] for reference.
Dim data() As Byte = wr.ReadData(second * i, second)
The result give me data.length()=0. I do not have any exception, I can read format from it and whatever reader I use I got this problem.EDIT : After some tests, it seems like the uncompressed file I create in the first step (in PCM format, with .wav extension) can not be recognized by the Alvas.audio library for the second step. I must miss something around Audio file markups or something alike.
Here is the code that might be the source (basically this is step 1):
Dim functOut As String = String.Empty
Dim wr As Alvas.Audio.IAudioReader = Nothing
Dim fs As IO.FileStream = Nothing
[code]....
How can I write the resulted stream to be sure I can read it again later?
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May 5, 2011
Im making a desktop player for a online web radio, and for the program I wanna make it show all the stream info. Like the stream name, and such. However I dont know how to do this? I looked everywhere
The server url is setup like this "[URL]" And it has all the stream info and that there. So is there a way I can get the info from there onto like say a label? Live updates btw.
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Oct 1, 2008
I've been creating short test apps repeatedly to try to understand some of the concepts in VB.NET.For the most part it has been illuminating.I read Bucky's .NET knowlegebase tutorial on passing objects as parameters to newly created forms. He shows how to create a new class that inherits from the base form class and define a New() method with parameters Extending the concept I thought about doing the same thing with a form that was created at design-time (In this case Form2).
[Code]...
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Apr 27, 2011
I want to read a number of items from a file and then associate each of those items with a new button at run-time, so that when the user clicks one of the buttons I can display some information about that item.Can I use a LIST to manage these buttons and items? Can I create a new class and have each list item of that class, such as 'btnID', 'btnText', etc... ?
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Feb 23, 2011
Can we create objects of a C# class from a VB.NET class and vice versa?
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Jun 11, 2012
I want to create a class that will "search" for something. Basically I load up the "search item" when the class is created and inside the class is logic to do the "search". The result of this logic will be more "searches" that I want to start. How can I have the logic in the class create another instance of the class itself?
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Nov 28, 2010
I want to create a class is it where I can do...
[code]...
How do I do this? Do i create a class and create a instance of CarData? but how do I add Color and Year etc to it?
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Nov 22, 2011
I have a problem with the cryptostream, if i write the stream to a memorystream the memory that the stream used is still alocated and i have no way of unalocating it.what am i missingdoing wrong? im using-using on the streams,readers and crypto stuffs so the framework should shut them all down right? i tryed calling .close and .dispose but nothing ,in fact i moved it all over I have provided the sub that im using for the encrytion im in .net 4.5 so there is a lil async stuff but i know thats not the problem coz i moved this code out of my main app(.net 4) for testing to see if i could fix the problem.[code...]
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Sep 10, 2008
I'm in the process of trying to create a class that will allow me to create windows shortcut; Im using the following PDF file that gives me the shortcut file structure.
Ive been able to successfully load a shortcut file and parse its Lnk File Structure but now Im on the Shell Item ID List structure but I cannot find the Structure of the ITEMIDLIST anywhere
Furthermore I know I could use the Windows script object, but this is a dependency Im trying to avoid if I can, hence writing my own Shortcut class.
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Feb 27, 2011
I'm try to create a class has been create by main class only by protect sub New but how do I create it ?
Public MustInherit Class Rune
Protected MustOverride Function Create() As Rune
Public Shared Function Factory(Of T As Rune)() As T
'I can't use "T As {Rune, New}" because Sub New isn't Public
'Return (New T).Create
End Function
End Class
[Code]...
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