Direct Casting - Pass The Whole Structure
Feb 29, 2012
I'm trying to implement a grid based RPG style inventory (teaching myself by making a game keeps me focused ) and I have an array of "item" objects. Part of this array is a picture box, which I then lay out in code to display the inventory. how to detect when one of these picture boxes is clicked. However, I'm having a little trouble getting my head around the Directcast command.
When a box is clicked, I would like the function 'boardclicked' to pass over not only the picture box, but the whole object it is associated with it, so I can print these values out the screen (detailing the objects name, value etc) [Code]. As you can see, this passes the picture box element of the object, but I'd like to be able to pass the whole structure, so I can retrieve the other associated values.
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Feb 19, 2011
I'm creating a Data Layer for a Web Application and in one of my functions, I need to pass in a Structure full of Customer info. This Data Layer is essentially a DLL. My problem is that I'm not sure how to do this.Below is my code and what I want to do.
[Code]...
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May 16, 2012
am trying to pass a structure that contains 2D arrays as Byte from VB.net to a C++ dll. The dll returns the structure with the 1D arrays filled. I am using UnmanagedType.ByValArray to pass the arrays from VB.net to C++.
Sample :
----------------------------------------- Structure -------------------------------------------------------
<Serializable(), StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi, Pack:=1)> _
[Code].....
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May 26, 2010
I'm working on a project where I'm experimenting with building and implementing plugins. I have a structure called "sensor" in the plugin that contains several elements. I would like to be able to return that structure to my main program through the interface, but it doesn't work. The plugin works fine if I'm passing strings or other variable types, but when I switch from strings to my structure, I get a couple of errors. On my main form where I try to call the function, I get the error 'value of type iMyPlugin.sensor cannot be converted to frmMain.sensor'. In the plugin code, I get the error 'GetSensorReading cannot implement GetSensorReading because there is no matching function on the interface'. Is what I want to do possible, or is there a better way to do what I want?
[Code]....
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May 8, 2012
I have inherited some god awful vb.net code and having trouble trying to work out the generics for looping through the current structure in place.
here is a snippet of the struct
Public Structure ApplicationDetails
Dim ID As Integer
Dim AgentID As Integer
[Code]...
but i am not sure on the syntax to set the value and when trying to get the type i get item.GetTYpe() is not declared.
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Feb 2, 2012
I have a structure to hold a student name, an array to hold 5 test scores, and an average score. I have created an a array of structures for 6 students. User input is setup through text boxes. I want to calculate the average for each student. I have made a function to do this. What I am having trouble with is how to pass the array of test scores to the function.
Here is what I have so far:
CODE********
Public Const intMAX_STUDENTS As Integer = 6
Public Const intMAX_NUMTESTS As Integer = 5
Public student(intMAX_STUDENTS - 1) As StudentData
[Code].....
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Jan 15, 2010
I'm trying to serialize a data structure and pass it to another report via parameter, and this line of code:
Dim s As New System.Xml.Serialization.XmlSerializer(GetType(System.Collections.HashTable))
Produces this error:
An error occurred during local report processing. The definition of the report '/myReport' is invalid. There is an error on line 22 of custom code: [BC30002] Type 'System.Xml.Serialization.XmlSerializer' is not defined.
How can I get around this? I have been able to use fully defined .NET classes in other lines of code, including the following:
Dim outStream As New System.IO.StringWriter()
and
Private colorMapping As New System.Collections.Hashtable()
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Jul 22, 2009
I am running into a problem which I am using C Dll into my VB.net code. I have .H file which shows implementation of this DLL in C language.This .H file contains many structures and unions that contain variable of some structures type. There is a main structure which contains the pointers to these structures and unions and finally address of main structure is passed into the dll function.
I am enable to figure out how to create structures and unions with marshalling in vb.net and how to pass address of a structure which contains addresses of othere structures and unions.
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Jan 5, 2012
Module Module1
Public Structure structure1
Public TRANS() As structure2
End Structure
Public Structure structure2
Public X() As Integer
End Structure
End Module
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Jan 5, 2010
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.
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Aug 29, 2009
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
[Code]....
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Apr 14, 2012
I'm experiencing a problem with the following c-structure:
typedef struct tagTEXTUREPROP
{
DWORD dwSize;
[Code].....
The Marshal.SizeOf obviously calculates a size of 76 and it works with the DLL function, but it leaves me with some bad feelings.
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Apr 25, 2010
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">
[code]....
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May 23, 2010
I want to make a structure within a structure. Basically it will appear like this:
Structure ID
dim CardType as string
im CardCode as string
[code]......
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Oct 12, 2010
In Vb.net I am trying to assign an array of structure to another array of same structure[code]...
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Oct 18, 2009
I am developing a web site in Visual Basic 2008 using .NET Frameworks 3.5 on an IIS7.0 web server and I am having a problem with a simple error page redirect. Furthermore I only have ftp access to the webserver in a web hosting environment. I am having problems with some errors and not others, mainly error 401 is the problem.<customErrors defaultRedirect="~/Default.aspx" mode="On" > </customErrors> this is the custom errors section of my [URL] file,
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Aug 26, 2011
I've d/l the DXSDK Jun10 version twice now and run the installation but I still can't find any reference to Direct Music (or even directx) in add reference. So how do you use direct music in VB.Net and W7?
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Jun 8, 2012
I have two tables:
table1
case_no flow result
tc_1 001 pass
tc_1 002 pass
tc_1 003 pass
tc_2 001 pass
tc_2 002 fail
tc_2 003 pass
table2"
case_no result
tc_1 pass
tc_2 fail
Table2 should be updates from table based on the results... If all results is PASS then the table2 should be updated as pass... if any result is FAIL then the entire case_no should be updates a s fail..
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Jun 19, 2009
This code was working consistently, but now...This code works on the first pass.Then second pass it just hangs on Code:Dim tcpClient As TcpClient = tcpListener.AcceptTcpClient() for about 2 minutesThen the code will fork for another pass, then fail.....
Code:Imports SystemImports System.TextImports System.Collections.GenericImports System.XmlImports System.Xml.LinqImports System.Net.Sockets
[CODE]....
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Mar 13, 2009
I have the following problem with MEF: Interface definition to be used by host:
Public Interface IExecuteDoSomething
Inherits IAddinSettings
Event DataReceived As EventHandler(Of DataReceivedEventArgs)
Function DoSomething() As Boolean
End Interface
[Code]...
Everything seems to work fine until the Button2_Click routine is executed, then an InvalidCastException is thrown with the info:Unable to cast object of type 'System.Collections.Generic.List1[SharedLibrary.IExecuteDoSomething]' to type 'System.Collections.Generic.List1[SharedLibrary.IAddinSettings]'.
How can i solve this problem, because the imported object implements both of the interfaces?
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Dec 9, 2009
The next code works fine in C#:
[Code]...
But this code crash with a OverflowException in VB.Net.
[Code]...
Both codes seems the same to me. What is the difference and how can I get the C# code converted to VB.Net?
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Aug 19, 2011
I have a object type variable (control .Tag) that I need to cast to a structured type, and change a member in. This is a contrived but representative example
[code]...
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Oct 16, 2009
get around this. I have a data base field that is a decimal data type and I want to display it in a text box with the following txtWeekdayRate = CType(RoomsDataRow!WeekdayRate, TextBox)I get the following error when I run my program.Unable to cast object of type 'System.Decimal' to type 'System.Windows.Forms.TextBox'.
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Mar 1, 2009
I am getting the followin error from my code. System.InvalidCastException was unhandled Message="Unable to cast object of type 'QADBASE.DMRDataLists' to type 'QADBASE.DMRData'." Source="QADBASE" I am getting the error in the code below on the createDMRIssue
[code]...
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Nov 24, 2010
How do I direct help from MS support on line?
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Sep 14, 2009
How would I draw a Direct 3D Line in VB?
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Aug 4, 2009
[code]...
In this case, children includes all the Parent elements and all of the Child elements. What's the best way to grab only the direct descendants of <Root>?
Should I write a LINQ query that selects elements where parent = <Root>? Or is there some built-in method I'm missing that can get this for me?
EDIT: I had some confusion between XElement.Elements and XElement.Descendants. As Ruben Bartelink pointed out, XElement.Elements will give me exactly what I was looking for.
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Feb 16, 2010
I have an account in rapidshare. How can I get direct link from rapidshare link in vb.net?
Sample : [URL]
Direct link is : [URL]
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Nov 20, 2009
I have a new mac with a windows partition. Have been using for a few weeks and all is well on both partitions. I m now trying to install Cad on the windows side, but it says i need direct3d. I have no idea how to install or what i need to install it.
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Oct 9, 2009
I have developed a custom DirectX UI library equipped with everything from buttons to a gridview. I need a screen-layout editor of some sort. It just takes too long to do it by hand, whether through a config file or hard-coding. I could spend a month or two developing a DirectX editing utility, but I don't have a month or two to spend on this. I could possibly justify a week.
Some requirements:
I need to be able to create a new screen I need to place controls such as buttons, textboxes, and containers/windows/etc throughout the screen I need to adjust properties of these controls (Name, Text, Width, Height, Parent Container, etc)
Some of my ideas include:Using VB.NET's form editor... setting up forms and translating the form's control information into game screens.Setting up a web-based editor (seems like this would take more than week... wouldn't it have to be flash based?)Setup a VB.NET win32 editor that allows placement of .NET buttons, containers, etc that correspond to my library's buttons, containers, etc.Is there a best way to handle this?
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