I have several quesions about reading/writing structures from/to files.In a scenario when I open a data file having its own header and variable data fields I create a structure that represents a header consisting of 9 bytes:
Public Structure HeaderInfo
Public DataField1 As Integer
Public DataField2 As Byte
Public DateField3 As Integer
End Structure
I'm using this code for the time being:
vb.net
Public Function ReadHeader(ByVal FileName As String) As HeaderInfo Dim ReturnInfo As HeaderInfo Try Using br As New IO.BinaryReader(New IO.FileStream(FileName, IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.Read)) With ReturnInfo
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The first question is - can I fill the structure directly somehow? Some structures are very long and filling them this way will be tedious. For example, if I know the length of the structure I could read the needed number of bytes in a byte array and somehow marshal these bytes into the structure.I can use Marshal.PtrToStructure, but then I would need to get an IntPtr of my byte array. I use <Serializable()> attribute for my structure.
I am trying to use VirtualQueryEx to read the memory of a process (first instance of notepad in this case). This function returns a pointer to the MEMORY_BASIC_INFORMATION structure. I am trying to read this structure.But everytime I try to access a member of the structure, I get a zero, which indicates I am messing something up.I am copying my code here.
Okay, I have a structure that contains numerous elements... mostly strings, one or two integers. I maintain an internal array of that structure. The structure contains ONLY data elements, no code.I want to save the data to a file. I know that I CAN use StreamWriter.Writeline()to put out a formatted string for each element in the array. But is there any way to simply open a binary output file and save each structure, one after the other? And conversely, to load the array again in similar fashion? Something similar to this in intent, though I realize the code below doesn't work.
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To repeat, I want to write an entire structure to a datafile quickly and easily, without having to save each member of each element in the array. And conversely, to read the data back in the same way for easy loading of the array.
Im trying to load a price of an item from a prices file (Items). The variable (ItemName) is taken from a listox populated from the file on another form. And (Item) is the structure which i saved the prices information for into (Items).
What im trying to do is take the string from the listbox and change the textbox (txtCurrentPrice) text into the price for the highlighted item, which is also the name of the (txtItem) textbox.
However i cant find a way to reference the Item.(ItemName) to get the correct price from within the file, as ItemName isnt a member of the Items structure Item instance.
ChangeItemForm Private Sub ChangeItemForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
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ItemName holds the name of one of the variables saved in the structure. So say if ItemName was holding "IridescentRoll" As its string I would be trying to find Item.IridescentRoll, which would show me the price of IridescentRoll which im trying to put into the textbox. and As Item.IridescentRoll = 3.35 it would display 3.35 in the textbox.
As you have probably guessed, the Item.ItemName doesnt work ('ItemName is not a member of...'
Is there any way to write this without having to create a new record for each item? As that would take a while, and im not sure i have the time x.X
I'm having a problem that's driving me crazy; I can't understand how to convert the XML structure into a class structure (that I want to use to hydrate a XML document).
The XML document looks like this:
xml <?xml version="1.0" encoding="utf-8"?> <artists xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/" xmlns="http://www.spotify.com/ns/music/1">
How to display a hierarchical file structure with checkboxes for each file and directory. The end result should be something like: +[] ROOT+[] dir1[]file 1[]file 2+[] dir2[]file 3[]file 4 How I might do something like this? The intention is to take in a full list of files and be able to pair it down to a custom list.
I'm new to Visual Basic. I'm trying to get this code to read a .txt file line by line. If the only thing that the line says is "B" it should add one to the intTotalBoys integer and so on with G for Girls, F for Fathers, and M for Mothers. I'm not sure why it won't work. [code]
I need to read in each line of a file that is comma delimited and I know how to do this.ut for this file, some of the values have quotes around them that contain commas and others do not. For example, the name field has "Doe, John and Lisa" and the other fields do not. How will this be handled? Will it read that whole field in as one or will it still seperate it as seperate fields?
I'm trying to read lines from a file using:Dim FileLine As String = ""Dim File As Integer = FreeFile()
Open "C:ext.txt" for Line Input # File But I get this error: 'Open' is not declared. File I/O functionality is available in the 'Microsoft.VisualBasic' namespace.
I tried to add Microsoft.VisualBasic as a reference, but it didn't work.
Now that aint workin. What i want it to do is read and compare usernames and passwords of text box 1 and 2 with 2 text files on my website. I am not caring about encryption at this piont so plz dont reply about the security of this method i know the risks. What i need is some source code i can look at witch has a simular method to mine
I've got a program which reads a text file, in this file there are 2 or 3 lines between paragraphs. However when displaying in my textbox on my form i have 14-18 lines. Why? and how can I remove them?
Ok so there is an XML file for a program that already exists that stores a list of files along with other information.I need to open this file and read the file names and then potentially add files to it if they DO NOT already exist in the file.It is very important that I not wipe the XML file and have to write it from scratch every time.
I have some files that contain strings and an image.I have an offset 0x068 (&H68) this is constant between all the files theoffset contains the offset of the info in the file example would be 0xE9400question being how to seek to 0x068 then seek to the new offset of say 0xE9400?then starting from 0xE9400 get Int from offset 0 size 2 bytesimage from offset 32 size 512 bytesThe icon is a 32x32 picture formed out of 4x4 16 color tiles and a single 16 color palette. Pallet offset is 544 size 32string offset 832 size 128 chars 256 bytes (unicode)I can read the first part of the header and return the string there
Dim header1(11) As Byte Dim fileOpen As IO.FileStream = IO.File.Open(TextBox1.Text, IO.FileMode.Open, FileAccess.Read)
I have a file - (called 38.dat) it contains a 3600 numbers (single) which are undelimited. This file cannot be read by notepad so is not in text format but saved a floating point numbers. how could i get VB.net to read the file and save the values to an array the size of 120 x 30?
I have XML which has following content. I am providing only small portion of code below. I need to read this XML file from Visual studio 2008 and display the contents on windows and web.
I'm having trouble reading a file into a filestream from a CD. I get 'Access to the path denied'. Works fine when reading a text file from a local drive, but getting error from CD. Dim fs As New IO.FileStream(filename, IO.FileMode.Open)
I get "Implicit conversion from "Object" to "Missed_Calls.MySettingClass" error message.
Dim objStreamReader As New StreamReader("program filesmissed_callsSettings.xml") Dim p As New MySettingsClass() Dim x As New XmlSerializer(p.GetType) p = x.Deserialize(objStreamReader) objStreamReader.Close()
Here is my code for reading a Binary file: Dim fs As New FileStream(filepath, FileMode.Open) Dim str As String = "" For d As Integer = 0 To l - 1 Dim byt As String = Hex(fs.ReadByte()).ToUpper fs.Position = d str+= byt Next
str becomes: 20202CB962AC5975B964B7152D234B But when I open the file in a HEX editor, it's: 202CB962AC59075B964B07152D234B70 Why are the 2 different?
I have several files that I am reading in and 'scrubbing'. The scrubbing is simply taking certain HTML tags and changing them - no big deal.When I read in the files (one at a time), they read and then I scrub them.The files stop reading mid-way *no matter what* the encoding type There is no stop character or anything, it is simple HTML and I do not see any reason why the file isn't being read I have attached one of files that is having a problem and the code is quite simple:
Dim oRead As New System.IO.StreamReader(Dir & "" & FN, Encoding.ASCII) EntireFile = oRead.ReadToEnd()
The file format has already been explained to me, and I can easily view it in notepad to understand it. It's basically a text file with a fancy extension and what not. The only problem is that I need to read it and pull a certain span of data from it.Here's the basic format:
8200 3251 1
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This is the first 10 lines, which is useless data for me. However, right after the first 10 lines, is a span of an unknown quantity of lines that I do need that are formatted like so:grassC:Program FilesMicrosoft GamesHalo Custom itiondatalevelsestlood_creekitmapslood_creek groundThe first line is the name of a bitmap assigned to the ID, while the second line is the path to the bitmap.Finally, after the unknown span of lines, there are two lines that go in this order:01Which I can safely assume at this point that the list no longer needs to be read.What I need to do is be able to open this file, skip over the first 10 lines which are completely useless, and then pull out the unknown gap of lines, and then stop reading when the line is '0', or at the end of the list.
I have a text file called: list.txt This is a list with all kind of lines like this:
14II_ARM_S_CLO_CLO_CLOVERIDS_PROPITEM_TXT_01194611IK1_ARMORIK2_CLOTHIK3_CLOAK=TRUE==200050000====PARTS_CLOAK=1==11=1===11_NONE Ofcourse every line has different numbers and letters.
The complicated bit is this:
I want to let Button1 check whats in TextBox1.Text and search "list.txt" for it. When it has got a match (there is only ONE of these numbers in list.txt).For example TextBox1.Text = "IDS_PROPITEM_TXT_011946". And I search for that so I find the line above. Now I want 3 other textboxes which show the 21st, 22nd, 23rd column/number after "IDS_PROPITEM_TXT_011946". And they should be editable by changing those 3 textboxes and clicking the apply button.How can I best do this, and please give a little example.
Is there a way to set BitConverter to produce Int32 values from BigEndian-encoded bytes?I feel like there might be a way to temporarily "set" the encoding to BigEndian before calling BitConverter, but I haven't figured it out.Right now I'm just reversing the 4 bytes before calling BitConverter, I guess I could create my own function that adds the bytes with the appropriate multiplier, but it seems a little inelegant if it can be done simply with BitConverter.
I am trying to read a xml file that is posted online through my windows app. What I am trying to do is get a value of one of the elements and then set that value to a string in my windows app.