I have the following .dll file created and added as a reference in my calling project; however, being new to vb .net I seem to be having difficulty calling the dll that I created.I want to pass a string to the below function, break that string out into two strings and then return the structure.
Namespace Item_Breakout
Public Class Item_Run_Breakout
Public Structure vbItem_Code[code].....
Private Declare Function src_simple Lib "libsamplerate.dll" (ByVal data As IntPtr, ByVal converter_type As Integer, ByVal channels As Integer) As Integer<br/>
Private Declare Function src_strerror Lib "libsamplerate.dll" (ByVal err As Integer) As IntPtr<br/>
<br/>
<StructLayout(LayoutKind.Sequential, Pack:=1)> _
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I have a DB with ~25,000 records that I keep in memory, and I need to pass one record to a second form for display.
code snippet follows:
Structure User
Dim First As String
Dim Middle As String
Dim Last As String
[code]....
The second form opens on second screen (Dual monitor) but I'm not sure what I did is correct. I have hit a wall on how to pass the single record from the structure to the form.
I'm migrating some VB6 code to VB.net,the code contains a structure that contains 1d arrays, 2d arrays, and few other variables.The general outline of the Vb.net structure is as under
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The call to the dll is declared as under Public Declare Sub getState Lib "val.dll" (ByRef state As Test)Elsewhere on this site I realized that we have to "marshal" the structure to allow it to be compatible with the unmanaged code that is about to accept it.However I still receiving runtime errors when running the code, I don't have any clue of how to use the System.Runtime.InteropServices.Marshal class.What would be the correct way to pass this structure to the dll?EDIT: The original VB6 data type is
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I'm a beginner when it comes to Visual Basic coding and I need some help with an error I'm getting. I'm trying to pass a structure array to a function to figure out a student's grade. I'm getting the error that 'QuizOne' is not a member of System.Array. Here is my code:
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I can't get to pass structure as argument through subs/functions in different files of single vbnet project like I use to in earlier MS basic versions.[code]File "mysetup.dat" is reachable and data is saved correctly what I can see with HxD.But read part seem's to not work as expected. Please any help on reliable passing structure as argument without too much public elements based on upper example.
View 1 RepliesI am trying to figure out how to print specific members of a structure when I only have to pass the structure itself i.e.
Dim Point1 as PointF = New PointF(15,30)
Debug.Print(Point1) ' This will output "{X = 15, Y = 30}" by default
I am trying to figure out how I can do the same with my own strucutres, for example:
Dim Point2 as PointF2D = New PointF2D(15,30)
Debug.Print(Point2) ' This will output "ClassName.PointF2D.Point2"
How can I get my structures, when passed to a print statement, to print specific members of that structure by default? P.S. Please give another way other than overloading the .ToString function.
I'm having problems with marshaling in VB.NET to C++, here's the code :
In the C++ DLL :
struct APP_PARAM
{
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I'm sure there are several ways of achieving my goal but I am after opinions on what you think is the best option. I'm writing a vb.net application which (amongst other thinks) interfaces with media players in the home. Because there are different types of media playersI'm trying to structure it so each type of media player has it's own class which interfaces to a management class which sits on top of all the different devices types.
The device classes are responsible for discovering the phsyical devices and returning that information up to the management class. A device class may be responsible for monitoring 1 or more physical devices so..
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Module Module1
Public Structure structure1
Public TRANS() As structure2
End Structure
Public Structure structure2
Public X() As Integer
End Structure
End Module
I am developing some program which will frequently read a file and occasionally write to the file. The file, however, is extremely huge - it may contain hundred of thousands of rows, and each row has a particular meaning to the program. That, is there may be loads and loads of rows, and a row may contain additional elements.For instance, a row might look like the following:
Code:
3 00000111000000 01110110 2 0
I am writing my program in C#, just fyi.Given my very large file, I am refraining from the idea of just using a text file, which is an obvious choice. I am also hesitating to use a database and a table.
I'm new to VB 2008 after having spent a long time with VB6, so I apologize if this is a stupid question. But I'd really like to have this straightened out.
Let's say I have a pretty large structure that has lots of properties.
Code:
Now say that I want an internal database with about 10 instances of this structure total, describing, say, 10 different products that a store sells. When these values are loaded from a database, they remain totally static. (However, they can be different each time a program loads)
Now say that I have a class. Each instance of this class is a type of that BaseProduct structure. Meaning, each instance of the class pertains to one of the 10 types of products that the store sells. However, this class has additional properties that pertain specifically to each instance, which are not static.
Code:
Now, the problem here is... If I have 200 different transactions, each one contains an instance of BaseProduct. BaseProduct is HUGE, and is largely redundant (only 10 types possible), so I think it's a little silly to include a whole copy of it with EVERY transaction. However, the Transaction class really needs information regarding the base product it pertains to. Is there a way to, instead of declaring a New BaseProduct in the Transaction class, to simply make one of the properties of the Transaction class a pointer to a BaseProduct variable?
In VB6, I would accomplish this by making a BaseProduct(10) array, and then giving each Transaction an ID number referring to an entry in that array. But in VB 2008, using class structure, this is impossible. I can't define the BaseProduct(10) array outside of a class in a namespace, and if I define it in the actual application's form, then the class loses modularity since it relies on the application that's using it.
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.
I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.
Public Structure MESSAGETYPE_OIP_Login
Dim Header() As COMMANDHEADER
Dim UserName() As PSTRING
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is there any way to convert a structure to a XML file? I searched in this forum and in Internet but only found conversions from classes to XML files. I also found a working conversion (or better serialization) from structure to binary file but this is not what I want. My structure looks like this:
Public Structure MyStruct
Dim bFraming As Boolean
Dim CtrlBus As Integer
[Code].....
I am trying to write a pre defined strcture into a binary file. how do i achieve this ?
my typical strcuture looks like
userid 2 bytes
company name 2 bytes
email address 40 bytes.
[code]i need to save this info to a xml file to view it later.i can have from 1 to 50 pieces..
View 3 RepliesNew to VB programming and am attempting a small database project. Attempting to take data from a text file and place it into a structure.
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I'm experiencing a problem with the following c-structure:
typedef struct tagTEXTUREPROP
{
DWORD dwSize;
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The Marshal.SizeOf obviously calculates a size of 76 and it works with the DLL function, but it leaves me with some bad feelings.
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">
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I'm trying to convert data from a vb6 application. Using get and put I saved a structure to a file in vb6. I'm now trying to read it into a vb.net class using BinaryReader.[code]...
View 5 RepliesIf I want to use a FolderItem verb like 'Copy to folder', then I have to somehow supply the name of the folder to which I want the object copied. How is this done. I dont understand how msdn can be so minimal on examples. Not one mention is made about this scenario anywhere on that vast resource. Hope someone here encountered this before and has the answer.
View 1 RepliesOkay, 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.
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 have a csv file with 48 columns of data. I need to open this file, place it into a data structure and then search that data and present it in a DataRepeater. So far I have successfully used CSVReader to extract the data and bind it to myDataRepeater. However I am now struggling to place the data in a table so that I can filter the results. I do not want to use SQL or any other database.
So far, this is working in returning all records:
Private Sub BindCsv()
' open the file "data.csv" which is a CSV file with headers"
Dim dirInfo As New DirectoryInfo(Server.MapPath("~/ftp/"))
Dim fileLocation As String = dirInfo.ToString & "data.txt"
Using csv As New CsvReader(New StreamReader(fileLocation), True)
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My questions isn't really about a programming language but, since I did not find a general programming forum, I chose this one as I know VB.Net. There's this game, that you might already know, which is called Star Wars Galaxies (And is ending soon actually .. ). For each account and character, the game automatically saves chat logs in a .cht file. A player can have multiple chat channels that have different chat filters (group chat, public chat, etc) and they are all saved in this file. I'm thinking they are probably separated by some kind of a "flag" for the game to be able to detect them.
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Regex in VB2008.I have a file system directory that my code is watching. When a file is placed in that directory my code kicks off a processing application. Based on the filename structure, the code will perform different processes. So I need to match the filename structure specficially to get the correct processes to run on that file.My file name structure is: IK2YYYYMMDD_VV.e;where YYYYMMDD is well, the year, month and day. And VV is a verison number from 00-99 If the new file saved in the directory match this structure then I want a TRUE returned. From a filewatcher I get the filename as an "e.Name" (FileSystemEventArgs) variable. My current code to see if it matches the baseline structure is;
Dim IKPred2Match as New Regex ("^IK2.*\.e$") Dim ValidIKPred2Match as MatchCollection = IKPred2Match.Matches(e.Name)I've tried many different regex match patterns, and just can't seem to find the magic one.
how to save an array of structure to binary file. I tried the binary formatter but it still aint workin. My code attached
Dim directoryList As String()
Dim fileData() As myData
Dim myFile As myProps
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I have a .txt file i want to read that has states by abbreviation and states by name. In that text file some are territories and some are states.
I want to read from that file and put the abbreviations into one structure array and the states into another structure array.
I then want to lookup up the states by abbreviation or state name. The lookup will simply be selected by a radio button which will flag either the states full name array, or the abbreviation array.
all I have is the structures created:
Public Class Form1
Structure Lookup
Dim Abbreviation As String
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How can I read from the .txt file and store into an array
Attempting to take data from a text file and place it into a structure.
Option Strict On
Imports System.IO
Public Class Form1
Structure Employee
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currently working through a project using VB 2008 windows form application and having a little trouble with the code. I need to read data from a text file into an array of a structure, displayed in a list box and have a number of searches conducted on the data and these results displayed on the form. The test data is of rainfall across a number of areas and is in the format: