Trying to setup a VB array (jagged array?) that has an entry for each rcd that contains the # of bytes in the data, as well the data. If it's possible how do you setup and loop through something like this is VB?
EX (1024 max bytes of data but it could vary):
struct inpRcd {
int rcdSize;
byte data[MAX_RCD_BYTES];
} inpRcds[MAX_RCDS]
Every time I do something that ends up using windows API calls in VB, I always end up having to look up the values for the windows constants. Does anyone have a file with a class or something for VB that defines all the WIN-API constants?
View 2 RepliesI am converting an application originally written in vb6 to vb.net. One of the things this application does is that it sends a object to a dll. I tried converting the type to a structure and p/invoking the dll but it does not seem to work
'Define WICS Communications Control Block (CCB).
Type WicsCCBType ' Create user-defined type.
CCBNum As String * 1
[code].....
I have the following
Public Structure Foo
dim i as integer
End Structure
[code].....
I have a struct setup like the following[code]...
I then loop through a counter and add each PersonInfo object to the Dictionary. The Primary defaults to false if the Code is already in the Dictionary, but if it has not been inserted into the Dictionary, I want to set the Primary to True. It would be easy to check if the Code was the key, but I can't because the Code is not unique.
I am looking into generics in .NET, and was wondering about the where T : struct constraint. I understand that this allows you to restrict the type used to be a value type. My question is, without any type constraint, you can do a limited number of operations on T. Do you gain the ability to use any additional operations when you specify where T : struct, or is the only value in restricting the types you can pass in?
I guess the question I am actually asking is that if I were to write, (in a discussion about how to use generics), "Now that you have constrained the type argument to value types, you can also do _________ on/with objects of that type", Is there anything to put in that blank? I can think of things for the other constraints, but not this one.
i being ordered to change my function skill to returning value by using struct but not using pointer. may i know what is the pro and con between this 2?
View 1 RepliesI have an application that reads data from a SQL query into a list corresponding to the rows of the query. So, I have something like this:[code]What I'd like to know is if I should be using a class (as above) or a structure, and what the difference may be in terms of memory or runtime, if any.
View 3 RepliesI have a DateTime struct I use, and sombody commented out the part where it was created (but not declared) When I was using it, myDate.DayOfWeek == DayOfWeek.Monday returned true.
If the part where it is created is commented out, how can it tell me it's monday, instead of throwing some exception?
I have a webservice created using classic ASP which i am trying to get working in .Net.
Currently i am using the following ASP to post an XML file to [URL] . This then sends back an XML response.
Code:
I am trying to emulate this in VB.Net so that i can receive an XML response from the xml_url.
However i get an error warnign me that the following cannot be created:
Code:
In the code base I'm working in there have a method that has the signature
Public Sub SetDropDownValue(Of T As Structure)(ByVal target As ListControl, ByVal value As Nullable(Of T))
The method I am writing is passed a parameter of type object.
How can I cast the object into something that can be passed into the SetDropDownValue method?
I am needing to write data to a usb device. The USB device uses a byte array (DataArray() as byte) to store the data. How can I assign a struct object (myStruct(0)) to the byte array. I run into the error "Value of type byte cannot be converted to 1-dimensional array of byte" when I try to cast the struct as a byte.
View 10 RepliesI have a Function that returns a struct in VB.NET:
CODE:
Where as in my struct I have two variables:
CODE:
When I try to populate the structure as shown above, I get an a nullvalue exception.
Public Structure testStruct
Dim blah as integer
Dim foo as string
[code].....
As we know when a column divider is double clicked the column width resizes itself to fit its contents. How can we emulate this behavior with code?
View 1 RepliesHow to emulate a mouse click with directinput?
like ive been searching for this for hours and can't find anything decent for VB 2008
Visual Basic 6 had the Text Box Array that worked great.It no longer exists(in the same form) in either Visual Basic 20085 or 2010.I know that there are work-arounds that emulate the Text Box array but these are certainly not as easy to use as the version 6 Text Box Array.
In Visual Basic 2010 there is a tool box item that can be added, called Text Box Array. However, this does not place a Text Box on the form and I can't find any explanation of how to use it.what adding this to a form accomplishes and how to use it?
I can load web pages into VS 2008 and then examine each component. Is there a way to load a web page in a browser control but not make it "active" - in otherwords, If there is a field for "Search Term" anmd a button for "Search", I want the prog to diosplay the properties of those elements rather than taking action.
View 7 Repliescode examples that emulate Windows Explorer?
View 7 RepliesIs it possible to emulate a mouse wheel scroll up/down with VB?
View 3 RepliesI need to emulate an Excel Web Query in .net Below is the sample code.I get an Error500 when I attempt to do this in .net, however in Excel it works fine.When I change the URI to a normal website it works fine, and returns the html from the page, which i what i am after. I wonder if the problem lies from the fact that I am trying to return a datatable
Dim oHttpWebRequest As System.Net.HttpWebRequest
Dim oStream As System.IO.Stream
Dim sChunk As String[code]....
Edit: I am getting the error when I getReponse from the server
Anyone know how we can connect a USB cable to one of the ports on the computer and send keys to it and have that acted like it was a keyboard if the cable was connected to another computer? I'm sure the USB jump drive for example is like a mini-computer, so how do we do the same thing but with a computer? Is there any code in VB, .NET for this?
View 1 RepliesIs there a way to emulate the following HTML function in VB.net[code]...
View 2 RepliesEmulate mouse click and drag?
View 16 RepliesI am trying to emulate the Wordpress post editor. Basically Bold, Italics, hyper links, bullet points, and numbering. Is there an application I can incorporate into my project and if so how would I do it.
If not, how can I reference text that the user has selected in a RichTextBox. Say they have the first 10 characters highlighted and the bold button is clicked, I would wrap it with <strong></strong>.Also, in a RichTextBox aside from an html editor, how can I justify the text within the box?
-Timers, but the timer lags too much.
-Stopwatch Class, still lags (little but still).
I need ms accuracy, my prg will replace a hardware stopwatch used in competition.
what I did was, I coded a HTTP web request "Browser". It's not a real browser but it's emulating a browser. It works fine, I'm using it to perform some searches without the clicking sound or audio from the pages (stupid ads).
Then thing is, it returns back the page's source code. There is a tag called "Block1". Now Since it's a string I can't just use str.document.getelementbyid("Block1").getattribute("value")but if the webbrowser can "emulate" then source code sent back from the HTTPBrowser then I can use it.
I have a basic confusion between serial port and network TCP communication to devices.
My colleague uses a vb struct as the nice easy to read way to create a packet to send out via a serial port. Like this basic code sample below of his vb.net serial call followed at bottom by my c# tcp beginsend network call.
Can I use a struct as well to call out for my TCP network beginsend? By looking at the signature of BeginSend(Byte[] as the beginning of the signature for that method call to send data to a connected socket, I don't see myself being able to use a struct.
Public Structure PacketRecord
Dim SourceAddress As Integer
Dim DestinationAddress As Integer
Dim Length As Integer
[CODE].....................
I have a text file with the following information:
-----------------------------------------------
Model: Accord
Manufacturer: Honda
Year: 2004
VIN: FJ235FJSLO323434DJS
[Code].....
how to setup my loop to insert the text data into my struct array.
I have a serious dilemma! I have a com port COM3 and i USB device attached to it ! now when i use Hyper terminal and i can read and write to it using AT commands. for example when i type in "ATI" in hyper terminal it will return me a bunch of data how can i so the same using a VB program ? is there a way to emulate the functionality of Hyperterminal? I tried using System.IO.Ports and a SerialPort class but no success.
View 6 Replies