.net - Load A File Into Memory Stream?
Jun 2, 2011I have a filename(including it's path) in a string. Now i want to load this .csv file into memory stream. ex: Dim filename as string="C:UsersDesktopabc.csv"
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Load A File From Folder To Memory Stream Buffer?
Jun 1, 2011I am working on vb.net win form. My task is display the file names from a folder onto gridview control. when user clicks process button in my UI, all the file names present in gridview, the corresponding file has to be loaded onto memory stream buffer one after another and append the titles to the content of the file and save it in hard drive with _ed as a suffix to the file name.I am very basic programmer. I have done the following attempt and succeeded in displaying filenames onto gridview. But no idea of later part.
'Displaying files from a folder onto a gridview
Dim inqueuePath As String = "C:UsersDesktopINQUEUE"
Dim fileInfo() As String
[code]......
Loading A File Into Memory Stream Buffer And Creating New File With Same Content And With Different Filename?
May 31, 2011I don't know whether it is simple or not because i am new to programming. my requirement is : In my vb.net winform application, the filenames of the files present in "D:Project" willbe displayed in DataGridView1 control. Now I want to load these files one after another into memory stream buffer and add the headers("ID","Name","Class") to the content in the file. Then I want to save these files in "C:" with "_de" as suufix to the filename i.e.,sample_de.csv.
View 1 RepliesConverting Memory Stream Byte Array To CSV File
Sep 26, 2011How to convert memorystream byte array to csv file. I have GetExport method that converts rpt file to excelformatted memorystream and then returns that as a byte array. Is there a way to convert this byte array to a csv file? Due to some reasons I can only pass this byte array back to calling function.
Public Function GetExport(ByVal reportID As ReportID) As Byte()
Dim byteArray As Byte() = Nothing
Using expRptDoc As ReportDocument = New ReportDocument()
Dim rptFileName As String = Server.MapPath(ReportCommand.GetXMLReportPath(reportID))
expRptDoc.Load(rptFileName)
[Code] .....
How To Pass WAV File To Media Player Via Memory Stream
Feb 6, 2012How do you pass a wav file to a mediaplayer via a memory stream? In other words is it possible to pass a stream instead of a url to play a wav file?
View 9 RepliesVS 2010 HTTPListener Of Large Memory Stream Vs File I/o
Feb 24, 2012I have a user interface app that allows you to drag/drop in files - and it turns them into HttpListener request POST's to another EXECUTABLE that I have running - let's call it BACKEND1. BACKEND1 will be running on a SERVER when this gets ready for production use. Lots and lots of users running the UI - all dragging in files - all getting POST'ed to BACKEND1 - with the file included as a memory stream in the POST. BACKEND1 responds to the UI with a "sequential" file number assigned to the file centrally on the server.
On the SERVER is also running another EXECUTABLE - let's call it BACKEND2. It's job is to work with the DRAG'd in files. Both BACKEND1 and BACKEND2 sit on the same SERVER. At the moment I am writing the memory stream to DISK in BACKEND1 - and POSTing the FILENAME to BACKEND2 for it to work on. Would it be better to not write the file in BACKEND1 but instead include it in the POST to BACKEND2 - where it can be written to DISK? Is having LARGE HTTP REQUEST's a burden when sent between two EXECUTABLES on the same machine?
My primary goal is to have a really available BACKEND1 talking the the UI instances running out in the world. I'm concerned that doing the file i/o in BACKEND1 is "expensive" - and I don't care about the performance of BACKEND2 as much. just looking for opinions. I guess ultimately I'll have to bench mark this myself in a production environment to get a real answer.
.net - Generate A PDF File As System.net.mail.attachment Using Memory Stream?
Nov 25, 2011I have a function that accepts a string and generates an email attachment based on that string. It works fine for html pages, text documents, and so forth but I can not get it to generate a PDF file.
Code:
Public Sub SendMail _
( _
ByVal strFrom As String _
[code]......
If I save the file attachment as Whatever.PDF i get the error that it was not encoded properly.I am using datadynamics active reports PDF exporter to generate the PDF
dim pdf as new datadynamics.activereports.export.pdf.pdfexport
sendmail("from@", "to@", "test", "test", pdf.tostring, "pdf.pdf")
I think the problem is I am converting the PDF to a string, and then trying to convert it back to a PDF and attach it to the email but I am not 100% sure.
C# - PDF File Is Damaged And Cannot Be Repaired When Moving Memory Stream To Filestream?
Jun 5, 2012I am using iTextSharp with VB.Net to stamp images onto PDF documents. (Since this is not language specific I tagged for C#, too.)I have two applications using the process.The first uses the bytes from the memorystream to display the PDF documents online. This piece is working. The second uses the same function but instead saves the PDF to a file. This piece generates an invalid PDF.
I have seen some similar questions, but they are all creating a document initially and have a document object in the code. Their memory streams are corrupt from the outset. My code does not have a document object and my original memory stream opens fine.
Here is the place where I get the error: (I have to put the buffer from m into a new memory stream because the stamper in the fillPDF function defaults to closing the stream unless marked otherwise.)
Dim m As MemoryStream = PDFHelper.fillPDF(filename, Nothing, markers, "")
Dim m2 As New MemoryStream(m.GetBuffer, 0, m.GetBuffer.Length)
Dim f As FileStream = New FileStream("C: emp.pdf", FileMode.Create)
[code]...
VS 2010 HTTPListener Of Large Memory Stream Versus File I/o?
Sep 28, 2010I have a user interface app that allows you to drag/drop in files - and it turns them into HttpListener request POST's to another EXECUTABLE that I have running - let's call it BACKEND1.BACKEND1 will be running on a SERVER when this gets ready for production use.Lots and lots of users running the UI - all dragging in files - all getting POST'ed to BACKEND1 - with the file included as a memory stream in the POST. BACKEND1 responds to the UI with a "sequential" file number assigned to the file centrally on the server.
On the SERVER is also running another EXECUTABLE - let's call it BACKEND2. It's job is to work with the DRAG'd in files.Both BACKEND1 and BACKEND2 sit on the same SERVER. At the moment I am writing the memory stream to DISK in BACKEND1 - and POSTing the FILENAME to BACKEND2 for it to work on.Would it be better to not write the file in BACKEND1 but instead include it in the POST to BACKEND2 - where it can be written to DISK?
Is having LARGE HTTP REQUEST's a burden when sent between two EXECUTABLES on the same machine?My primary goal is to have a really available BACKEND1 talking the the UI instances running out in the world. I'm concerned that doing the file i/o in BACKEND1 is "expensive" - and I don't care about the performance of BACKEND2 as much.
Crypto Stream To Memory Stream?
Nov 22, 2011I 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...]
View 12 RepliesLoad Xml File In To Memory?
Apr 16, 2009I want to load an xml file into my program then extract data from it into text boxes. For loading purpose I would like to be able to have something that looks like the open file dialog. So that I can select different xml file each time load it into my program have it take the layout i created. I would like be able to alter any text then save the alteration and print it out. I am using visaul studio express edition visual basic 2008.
View 2 RepliesClear Memory Stream?
Apr 17, 2009'in form class
Dim PIC_PATH As String
Dim PICTURE As Image
[code].....
Loading SWF From Memory Stream?
Dec 5, 2006I'm using the ShockwaveFlash ActiveX control in a VB.NET Windows Forms application and i'm wondering.Is it possible to load an SWF file into the ShockwaveFlash ActiveX object from a memory stream rather then from a file name?
I've noticed that the ActiveX object has such properties as "InlineData" and "MovieData", possibly these could be used.
I've also noticed someone has used Windows Messaging to send a pointer to a stream to the ActiveX control, has anyone seen this done?
Play Video From Memory Stream?
May 5, 2010I have an application that sends Bytes of data through UDP, these bytes are read from an AVI file when the client receives the bytes it builds the AVI file on another computer perfectly but I want to be able to use the received bytes to play the video from the stream. Does anyone know how I can play the video from a stream? I tried using DirectShow but I don't know how to use a stream as video let alone having AVI files play with DirectShow.
My main goal is to have the application slowly "buffer" the movie for the client as they watch.
VS 2010 : Get A Memory Stream To A Textbox
Dec 15, 2011im trying to get a memory stream to a textbox, the memory stream is of a .txt or .ini file that is extracted from a archive to a memory stream.Heres what ive got so far:
vb
Dim MSData As New System.IO.MemoryStream() Dim Infile As String = ComboBox10.SelectedValue 'The input archive Dim passww As String = TextBox1.Text 'Archive password Using extr As New SevenZipExtractor(Infile, passww) extr.ExtractFile("02.ini", MSData) End Using Dim sr As StreamReader = New StreamReader(MSData) Dim textSsS As String = sr.ReadToEnd() ini02.Text = textSsS
The problem is that ini02.text stays blank?
C# - StringReader Or Memory Stream Which Is Resource Friendly?
Jul 11, 2011I have a module which will be responsible for parsing CSV data received from different user via a website interface, and I have to parse that CSV. I was considering to use, TextFieldParser for it.
But before I could implement I was considering what shall be a better approach...
Generating MemoryStream from data received,
or initialising a StringReader from the same input string.
Conversion Of Byte Array To Memory Stream?
Aug 25, 2010how to convert byte array to memory stream in vb.net.
View 1 RepliesMemorystream - Rendering Memory Stream To Browser?
Jun 10, 2010in VB.NET How can i write a memory stream to browser.My memory stream object has data to build a PDF file.Now i want it to be rendered on browser.How to do that ?
View 1 RepliesVS 2008 How To Modify Text In Memory Stream
Apr 4, 2010I'm writing some text to a memory stream and need to modify it once in the memory stream The reason I can't modify prior to adding to the memory stream is that it is from some 3rd party component. Here is an example:ms = New MemoryStreamdoc.Save(ms, SaveFormat.Html)I need to do some modification to the resulting text that ends up in ms. Is there a way to convert the contents of ms into a string, and then back into a memory stream once modified?
View 13 RepliesVS 2010 Chart Control In Memory Stream?
Mar 29, 2011is this possible to do in memory (so i can get rid of any disk IO)?:
If File.Exists("c:MyImage.png") Then
File.Delete("c:MyImage.png")
End If
[Code]....
This above code works great the first time then errors out on any successive attempts after that with the file being used by another process at the File.Delete line. The image is being generated for use as a mail attachment and i've only ever done it via a phyical file on the disk.
VS 2010 Memory Stream Serialisation And Networkstreams?
Jul 28, 2011Ok I have written this little Class that accepts a tcpclient as part of its constructor.
[Code]...
.net - Load An Unmanaged DLL From A Stream?
May 18, 2012I have an application written in .NET 4.0 that needs to load in memory a native DLL (written C). At the moment I am using a P/Invoke call to LoadLibrary passing the path where the DLL is located. This works, but due to the fact that this DLL comes from a DB, I would like to know if it is possible loading it through a stream, avoiding then the necessity to store the DLL somewhere in the filesystem.
View 2 RepliesStream Load Jpeg For Window Mobile 6.x?
Dec 20, 2010This is the very first time I join this forum, since I have difficult convert vb.net code into windows mobile 6.x vb.net compact frame. I hope someone know how to write coding for compact frame.
I would like to load jpeg stored from an array to picture box, the following code work for vb.net only, It is not working under wm6.x compact frame.
[Code]...
Memory Stream To Image :Error "Parameter Is Not Valid"
Jun 9, 2011Public Sub imageload(ByVal index As Integer, ByRef imagedescription() As String)
Dim da As New OleDbDataAdapter("Select Foto From Images where Photoindex = " & index & ";", Form1.baglanti)
Dim dt As New DataTable
Dim ms As New MemoryStream
[code]....
i was take "Parameter is not valid." error pff where is my mistake?
Load An Array Of Images Into Memory?
Feb 6, 2010I'm newb in the .NET framework so how could I go about loading an array of images into memory?[code]...
View 4 RepliesLoad Everything In Memory Upon Application Start?
Oct 9, 2009I'm using VB.Net, and I have a set of data which I have to able to filter through fairly quickly.Basically, the program is like google sugest, but instead of a drop-down menu, I'm using a listbox. When a user enters a word, I compare the word using LINQ and filter those that contain the user's input. The data are all strings of variable length (from 0 to 200 characters, most on 150 character mark), and I have 240,000+ of this strings and counting- all stored in an XML file.
A colleague of mine told me that loading all of that to memory (using VB.Net's XML serializer plus collections of string/objects) is not practical, and would slow the 'startup' time of the program. I haven't finished building the program yet and I'm having second thoughts about continuing this path.
So, my question is: Should I continue with my current approach on the problem (which is load everything to memory on startup), or is there a better way of solving my dilemma?
Interface And Graphics :: Load Image And Access Its Memory Buffer
Mar 31, 2011I have some questions about bitmaps and such. I am using the IDXSurfaceFactory::LoadImage Method to load an image and now I want to access its memory buffer, so I can do some direct memory manipulation and copy the content to another buffer afterwards (no BitBlit!). I managed to successfully use LoadImage, but I have no idea how to retrieve the pointer to the memory buffer and other informations. I want to basically know everything about, how and where the image is stored in the memory buffer.
Does windows always load images as BGR regardless of its original format? if not, how can I find out if the loaded image is stored as BGR or RGB. How can I find out how many bits each color has? How can I find out if the image is stored y-reversed? And if you load an indexed png for example, with one color marked as transparent, how can I find out which color is used for transparency?
Stream Read Return Length 0 While Stream Is Open And Has Valid Data In It?
May 25, 2012in 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?
File I/O And Registry :: File Stream - Backup Program That Zips Files ?
Feb 9, 2009I am writing a backup program that zips files. Using some sample code I have the following that creates a zip file. Problem is it does not get any subdirectories or files. Where am i going wrong?
Dim azFileNames() As String = Directory.GetFiles(SourceFolder)
Dim objCrc32 As New Crc32()
Dim zipStream As ZipOutputStream
[CODE]...
Alternativley, there is another component to the zipping dll that I could probably bypass the above altogether. It is: FZ.CreateZip(DestFile, SourceFolder, True, "", "") Where DestFile is (Output stream as system.io.stream). I'm trying to read all the files, directories, sub dir and files, etc from a specific location, let's say 'My Documents' into Destfile in which the FZ.CreateZip zips the file. FZ is FastZip which is from icsharpcode.net. They have c# examples, but that's greek to me. I'm trying to just learn VB!
Modify Few Byte In A File Via A Stream Does That Means That Full File Is Rewritten?
Jun 9, 2010If i use a stream to modify few bytes in a file without changing the total number of bytes
does the stream rewrite all the file even if just few bytes have been replaced?