File Access - When Open The File With Something Like Notepad, It Shows Random Ascii Chars?
Oct 19, 2011
Years ago when coding with VB6 and earlier, I used a file open command to create, read, and write a file that made it easy to store useful information.I believe it was binary and you wrote/read the data to a specific line in the file. When you opened the file with something like notepad, it just showed random ascii chars. When I needed a line of data, I could specify what line to load it from.
I am writing a program to calculate Pi to several hundred billion decimal places and this will require lots of GB of memory. I wrote a test program in VB2008 that saved the first 16 digits of Pi (without the decimal point) to both a text file and a random access file, just to be sure it was outputting the numbers properly. For reference the first 16 digits of Pi are:
I'm building a simple Notepad where users can open CSS & HTML files & was wondering how I can program it to open the file in the main text box like the regular Windows Notepad does.
I just published this simple console application that is supposed to show a textbox with the value of a setting called "userID" with value 1001. This works like a charm. Now what I need is to change this value outside the editor, from notepad etc. When I open the application a lot in there is non-sence etc. but with a quick (ctrl + F) I found the value 1001, and changed this to some other integer.
I ran the application again, and it failed, didn't even give any userful error-message. At a point I tried just opening a newly published non-corrupted version of the application, didn't change anything, then saved from notepad, and it were also corrupted. It seems like notepad can't open some characters or something. Do I need to publish the application in some specific text-unicode language or something? I use vb.net for this
Suppose I have this Dim proc As Process proc = Process.Start("Notepad.exe", "C: est.txt") Now, if I want to use Notepad.exe to open another text file (ie. C:2ndTextFile.txt) without closing it, how am I going to do it?
I have searched, but failed to find a suitable answer to this. My small app saves a text file using a savefiledialog and stream writer. Then if successful, displays a messagebox confirming sucess and asks if the user wants to open the text file now. and this is the problem... How do I determine if the user has changed the filename and or path in the savefiledialog when saving? I'd prefer not to hard code a path and file name if possible.... but that seems like the only option? and therefore I can't show the file straight after saving reliably??
I have a text file that includes a list of first names, each on their own separate line.
What I am trying to do is to find a way to click on my button and have my app open the list and randomly grab a name and place it into a textbox.
I would include some code but I'm not even sure where to begin.
I'm thinking that I will need to code the button to use the openfiledialog..create an algorithm to use a random copy line and return it into the textbox.
I have a text file that includes a list of first names, each on their own separate line.What I am trying to do is to find a way to click on my button and have my app open the list and randomly grab a name and place it into a textbox.I would include some code but I'm not even sure where to begin.I'm thinking that I will need to code the button to use the openfiledialog..create an algorithm to use a random copy line and return it into the textbox.
I have been trying to open a solution file downloaded from my class for the past two days. When I open the assignment file on my destop to access the solution file, it's not there. I have the variables design, obj, bin, and others but not the .sln file which is the one that I need. How can I fix that problem?
I try to map to the network drives and i am able to read the number of folders in the drives and access right for FULL CONTROL ( READ , write etc. ) is given to me and in fact "everyone in the same domain group that i am in. However i encounter the following code error where FileOpen(1, ReadString, OpenMode.Binary) --> It prompts that access to the path of \xxxxxxxxxfolder is denied.
Created Structure opened file using FileOpen(1, "filename.dat", OpenMode.Random, , , bytes in structure) used structure .ID = record number FilePut(1, structure) FileClose(1) The program enters the first record but although when I enter more records it still shows only one record in the file.
I am moving all of the prgrams that I have written, to VS2008. However, I use Random Access File Foemat for the databases that have been used for over a decade. I need to be able to read and write to a Random access file.I have multiple fields in the database and cannot lose access to this information.VS2008 doesn't use the following type of code to define the Fields that will be used in the Database. I did what it suggested, using the Structure / End Structure, but that was as close to a solution that I could find in the Help Files.
Type EquipType EquipName As String * 32 Location As String * 28[code].......
I'm doing a Program for a Friend of mine, He Want to have a Console Program Running on his Computer.OK the problem i am having is With Stream Read, I have 3 test users inside Test File, if User 1 logs in his information is store in logged file with time and data.but if User 3 logs on user 1 2 and 3 are all saved on the logged file
i dont have read to end of file in my Code.i dont have my Program with me, so i going off the top of my head i have something like this what i want to be able to find out how to do is Right from any part of the file and out put it, I take it i need to use Random Access but how to i code Random Access for this type of file. All i can find is how to Randomly place Words in a text file with Length and size.
I achieved reading and writing data to a random access file, buthow do I write and read data from a certain position in the *.txtfile? Would it be better if I created multiple file modes to
I am using Visual Basic 2009 to create a file of records to store students tests scores.Currently i can write to the file, create new records etc. However i cannot edit a particular record, im sure i have to use file seek function but i have no idea where to start.here is some of my source code to give you an idea of where im at
Do While (Not EOF(1)) And found = False 'loop until no more records or the record is found nosrecords = nosrecords + 1 FileGet(1, onestudent, nosrecords)[code].....
how to read and write random access records in .NET. Now I know random access files are dead and the response on every query I found with google/bing/yahoo searches was don't use random access use Binary serialization but I can not. I have a situation where I need to read and modify 256 byte records in a file that is used by another application.
Now for a bit of background the file is made up of 27 fixed length records of 256 bytes. Each of the records has a separate structure consisting of 30-120 fields. The proplem I am having is I can create the record structures but when using the FileGet method I am receiving an error. Now I have found samples that showed the same format I am using that claim to work.
The error I am getting is Option Strict On disallows narrowing from type 'System.ValueType' to type 'ProgramName.ModuleName.Record' in copying the value of 'ByRef' paramater 'Value' back to the matching argument.
The basic layout (simplified) is as follows:
Code: Structure Record <VBFixedString(6)> Public SomeParam as String Public SomeNumber as Short
[Code]....
Now the overloads for FileGet show all of the data types including Object. But I have tried various methods to retreive the 256 byte record but without success. Do I have to actually read each of the several hundred fields of the structure one by one? Or am i overlooking something (I have been known for this in the past)
Or (and I'll kick myself if this is the only way) do I just have to set option strict Off in the module and the code as above will actually work.
I would love to be able to just ditch the random access file but I have to keep it for compatibility with several other applications at this time.
The application reads information similar to a DXF file. For purposes of discussion, the data consists of lines, those lines have endpoints, x1,y1,x2,y2. Within the file those lines create "paths", in other words, they are connected. There can be many separate paths within a single file. However in the original file, the geometry is not in any particular order, the paths are not indicated.
I'm tasked with the job of creating a javascript version of a units conversion application written in vb6. I have the source code but I don't have vb 6. The source code uses a dat file to hold a conversion array (unit type, unit, xfactor, plusfactor). Getting the data out of this file would be good to me. I tried creating a little app in vb 2010 to write the data from that dat file to a txt file using essentially the same code as the source code. And that has been somewhat successful (took a while to figure out the fixed string business). Now I can pull the data out as an array. The math elements of this array look fine but the strings are somewhat read-able but too garbled to use. I can't seem to fix that by changing the character set/encoding.
This time, basically, i'm working with Random Access Files.I have this et of code to read data from a form a save it into a .dat file. This works fine.
Public Class frmDramaClub Structure MemberRecord Dim ID As Integer[code].....
how to proceed. One of our customers is going to be sending me a flat file (ASCII-Text) that I have to break down and scan. Every line ends in a CrLf - So I know I can use StreamReader and ReadLine(). I did get it to work on one of the test files they sent.(A very Short file) However, the file is not delimited at all and every field is padded to the full length they specified. Here's the format of the file:
where filename includes the path. It should open the mdb file in Microsoft Access.
This works fine on Windows 7 (my system), but when I try it on Windows XP (client machine) it comes up with the file download security warning dialog asking to Open, Save or Cancel. If I click Open it presents the same dialog but now with Save and Cancel only.
I am sure there is a quick and easy way to open a file in its proper program through VB.NET. I know I can open the database using Interop, but I don't want to go down that route.
I need to read the following file in vb .net:"C:WindowsSoftwareDistributionDataStoreDataStore.edb". It contains info about installed software updates. I've taken a look at the file by opening it with notepad. This isn't a plain-text file obviously, but I can find and see the text I want easily with Notepad, and I want to extract this text by using VB .NET.
The problem is, i've tried to read the file by using an io.streamreader, but I can't get the same results as in notepad. I've tried to change encoding but that doesn't work. I mean in Notepad, I can read some text easily: "A s e c u r i t y i s s u e h a s b e e n i d e n t i f i e d" [...], but the only thing I get with the streamreader is some bunch of ugly characters, and the text I saw with Notepad isn't there.
Do I have to read the file in binary or what? HOW NOTEPAD DOES IT? HOW DO I READ THIS FILE LIKE NOTEPAD DOES?I absolutely need to extract some updates info that aren't in either the registry or WMI/QFE.
I have a flat file that is sorted by account number. I am migrating an application that was in vb6 to .Net. The application uses Random file access and uses a binary sort method to find a record.
Here is the code Do While (low < high Or low = high) And (f = 0) 'Checking for an account match middle = (low + high) / 2 FileGet(FileNum, Record, middle) If Account < Trim(Mid(Record.Data, Byte1Start, Byte1Len)) Then [Code] .....
From reading up on this in .Net it seems that using the Binary Reader seek method would be the alternative to using old vb6 random access code. The problem is the Binary Reader Seek method goes by Byte position instead of record number. How to convert my code to use a binary reader.
When you need to do random access to the lines of a text file, the regular solution is to put those lines in a list and access them in that list.But doing this if the text file is large creates a large memory overhead and may cause some memory stress on the application.This class maps the file and provide the ability to read any particular line in the file at a random position, without the need to read or put in memory any other line but the desired line. The only memory overhead involve is the 1024 bytes buffer of the base stream.Even if the file mapping can be a process that consume a noticable amount of time if the file is very large ( ~ 5 seconds for each 100,000,000 caracteres) , once the mapping is done the access to a particular line becomes instantaneous regardless of the size of the file. (The file mapping can always be done at a convenient time (ex when the process load) and can be done on a worker thread The class is base on a StreamReader to support the differents Text Encodings Example uf usage ( As I say, if the file is very large, dont do it like that, but declare the class at a convenient time)
Imports Reader = System.IO.MyStreams Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
