There appears to be a problem when I use the CallByName function in my actual script. While testing it I used some hardcoded arguments to pass to the procedure in CallByName function. This worked fine. In the actual script these arguments are coming from an XML file. When I read this XML document the values are string values by default:
<Parameters>
<Parameter>A string value</Parameter>
<Parameter>False</Parameter>
[Code]....
Are there any disadvantages in performance by using the CallByName function in VB.NET? Is there any better way to do the call by Name in .NET 2.0 onwards.
View 3 RepliesI have an object with a number of properties (let's say object.one, object.two, object.three). There are about 30 of these properties and they all hold a string ("Pass" or "Fail"). Right now the existing code checks whether the property has value "Pass" or "Fail" and then runs some code that prints stuff out. That is, the same snippet of code is duplicated 30 times, one for each of these properties.
The code looks something like this
If (object.one = ... )
...
End if
If (object.two = ... )
...
End if
If (object.three = ... )
...
End if
I want to use a loop to clean this mess up (each block is huge), but am not sure how to do it. I was thinking perhaps there was a way such that I might be able to construct a string like "object.one" and run some function that will tell the compiler that this is actually an object's property? That way I could create an array containing the object's name like my array = {"object.one", "object.two", "object.three"} and then do something like, in pseudocode
For each string in my array
If (some_function(string) = ...)
...
End If
Essentially, it would take those massive blocks of duplicated code and reduce it to just one block. Is there such a some_function that I am looking for? This is in VB.net.
Using VB.NET 08 I'm using the following code which loops through a datagridview and makes the buttons found in the list visible
HTML Code:CallByName(Me.Controls("btn_" & list.Rows(J).Cells(1).Value()), "Visible", CallType.Set, True)
This code works fine with no issue with the buttons on on the form. However when I placed the buttons in to a tabcontrol on the same form I get the following error:Object variable or With block variable not set.
Does this error relate to the way CallByName calls the button handler and that its different to they way you could otherwise produce the same result using
HTML Code:
button1.visible=true
I am trying to call a public subroutine from a Windows form based on a string variable containing the name of the subroutine. The subroutine is a procedure in a code module and works fine when called by using the procedure name directly. The VB.net function CallByName should work, but I don't know how to specify the module name as the "Object Ref" parameter.
In the code shown, "ReportLibrary" is a module containing the public sub with the name contained in the string strReportProcedure.
[Code]...
What am I missing or is it just not possible to call a routine from a module using CallByName?
how can I determine the actual date?
Of course I know the Now() function, but what, if the user sets the date on the computer f.e. 2 days back? I have tested it, I get the date from 2 days earlier.
Is there another way to determine the REAL actual date?
I have a screen full of puzzle peices they are all rotated at different angles (90,180,270). is there a way to track the peices rotation? I was thinking of using a 2d array to store there rotation. however, I am using this code to rotate the peices:
[Code]...
how can i get the actual pixel coordinates, in the pb_mousemove event, from an image with sizemode stretched or centered or zoomed?
the e.location property returns the location in the picturebox, but i need to compensate for scale + the left + top offset of the image.
How can I get the coordinates of a form (current form => Me) of the upper left angle of it on the screen?
View 2 RepliesI am running windows xp media player. Everthing works fine except my photos. They show in library normal but when I select them to play they look as if they have visualized bars. No actual image displays. How can I correct this?
View 3 RepliesThe Print Preview document is set to the print document.[code]...
When I print the document (from print preview or my print button) the papersize/margins are different...this is how:
1. If I draw a rectangle from (0,0) to some width or height the point is in the corner of the print preview but on my actual printed page it is about 1/4 in to the right and 1/8 in down.
2. I have an extra inch or so on the right side and bottom of the "page" that print preview will print to but will be cut off in actual printing.
I am assuming that there are some default settings (like the printer gutter and letter paper size) that print is getting from the printer that print preview is not, possibly. I need to have my print preview look exactly like my actual printed page.
Right say you had 4 columns and decided to add a new one at the start just for checkboxes. originally your code is
[Code]...
I have a 3-axis robotic machine. But due to training purposes, i would like to create a simulator/emulator that act just like the 3-axis robotic machine. I want the simulator to be able to create its own virtual parallel port. So instead when i execute the coding that operates the actual 3-axis robot,whenever i send a trigger to my virtual parallel port, my simulator will start working. So my question is,
1) How to develop a simulator/emulator using Visual Basic.NET
2) How to access and create a virtual parallel port within my computer.
I am having the following problem with a chart displaying a value that is heldwithing a variable but 10 times lager. But this is only happening in my programfor a user that is located in the Netherlands.If I run it from the UK or other people run it from other countries the valuesare displayed correctly, it only seems to be a problem for this one userin the Netherlands.I have checked my code and all is correct and there are no Multipliers added tothe value.To show what I mean see below, as I do not have the code to hand as I am currently at work.
View 2 RepliesI'm using VB2008 and I have a CmdButton and a Listbox. When the CmdButton is clicked, it will look for all the files contained on a fixed directory and the names of the files will be enumerated to the listbox. I have that piece working perfectly.
The question is -- after the listbox is populated with the filenames, can I select one or multiple items from the listbox and copy the actual files from the original directory to a directory that the user will specify via browse folder dialog? Maybe right click on the selected item(s) then export? Just a thought..
lets say i have a string that holds "Monday" and another string that holds "9:45:00 PM". would it be possible to look at the Date.Now() function and see when the next Monday is, and then convert those two strings into a date? lets say the next monday was 05/20/2011. I would want the date variable to hold "05/20/2011 9:45:00 PM". any ideas guys?
View 1 RepliesI am converting a VB.Net application to C#. Everything else is going great. Except this bit. I have a function which builds menus,sub menus and seperators from a database. It can build a MenuStrip or a ContextMenuStrip which can then be assigned to a form.
This means that menus can be extensive and conpmex but managed outside the application, which I also use as part of my security access model. All menus are controlled from the database externally, it also means I can develop visual tools (Treeviews etc) to manage user menus. The application uses menus extensively which is by design.
Programmatically I want to assign an eventhandler to every item that isnt a dropdown or a seperator
In VB I would do this, (works perfectly)
[Code]...
"System.Windows.Forms.ToolStripItem' does not contain a definition for 'DropDownItems' and no extension method 'DropDownItems' accepting a first argument of type 'System.Windows.Forms.ToolStripItem' could be found (are you missing a using directive or an assembly reference?)"
Consider the following case:
Public Interface IHasDateUpdated
Property DateUpdated As DateTime
End Interface
Public Class MyClass
[code]....
Now, assuming I was referencing an instance of MyClass as an IHasDateUpdated; how would I determine the actual name of the property that implements the interface property via reflection?For example:
Dim x As IHasDateUpdated = New MyClass()
' How do I derive "MyDateUpdated" from "x" using x.DateUpdated?
I used webclient to surf a site with a proxy and I got no result. I use firefox to access the same site with the same proxy and I got result.
I want to know what sort of header webclient send and compare that with livehttp add on in firefox
Is there a way to make the actual tabs different sizes? I just want the tabs themselves different sizes not the whole thing. Seems like the itemsize property does this but it will only allow you to set one size. I want each tab to be a different size depending on its text.
View 11 Repliesso I was originally having problems even saving the data, but I can now get it to stay in the dataset, and when I switch to another page it stays there when I go back to it. Although when I close the form and reopen it, the changed data has not saved. I know that it is because I have only updated the dataset and not the database, so was hoping someone could give me pointers of how to approach it.
[Code]...
It seems that the autosize columns will only make them bigger. For example, if I have a DGV that fills most of the form and then only three small columns are loaded, there is a whole bunch of darkgrey empty space. Is there any way to snap the side of the DGV to the actual data?
View 8 RepliesI have the following barcode image:
I'm using the following iTextSharp VB.NET script to generate a PDF document containing this barcode:
Dim pdfDocument As iTextSharp.text.Document = Nothing
Dim filename As String = HttpContext.Current.Server.MapPath("barcode.pdf")
pdfDocument = New iTextSharp.text.Document()
[Code]....
When this PDF is generated, however, the image is appearing larger than expected, and is distorted:
I can't see anywhere where I'm setting the image to be a specific size, so why would it distort like this? And how can I prevent it?
It's crucial that this image remains the size it is intended to be so that it can be read by barcode scanners.
How do I determine a mapped drive's actual path?
So if I have a mapped drive on a machine called "Z" how can I using .NET determine the machine and path for the mapped folder?
The code can assume it's running on the machine with the mapped drive.
I looked at Path, Directory, FileInfo objects, but can't seem to find anything.
I also looked for existing questions, but could not find what I'm looking for.
In C#, I could do something like this:
EventHandler handler = this.SomeEvent;
...which would allow me to, for example, do:
Delegate[] attachedHandlers = handler.GetInvocationList();
In VB.NET, I can't seem to figure out how to do a similar thing.
This doesn't work:
Dim handler As EventHandler = Me.SomeEvent
...due to the following error:
Public Event SomeEvent(sender As
Object, e As EventArgs)' is an event,
and cannot be called directly. Use a
'RaiseEvent' statement to raise an
event.
But this doesn't work either: [Code] So how can I actually get an EventHandler from an event in VB.NET? The only idea that's immediately coming to mind is to use reflection, but that seems pretty ridiculous.
I managed to print in landscape, however this setting is not being passed onto the printer driver, and when I click on 'preferences' in the printing dialog the printer seems to think that it is printing in portrait. Is there a way to change this in the code, without having to ask the user to do it?
View 5 RepliesHow would I go about changing the actual shape of the RichTextBox caret?
I have tried using the CreateCaret and ShowCaret API calls, but they only seem to work with normal text boxes. Is there any way to modify them so they work with RichTextBoxes?
as part of a small encryption program i am making, i am converting the contents of a textbox to hashcode. I used the built in feature for this:.GetHashCode Now once i have the hash code how do i convert it back to regular letters?
View 3 Replieson my Bookings program i've got a listbox where i can select the booking date of each room, and then i can see the details "UserID, time start time end etc". When the UserID is read from the database it takes the user id number (which its supposed to) but now i want to take that number, and match it to the actual "User Name" and then display the Name.this is what i've got so far;
Dim BookingDetails As New SqlCommand("SELECT UserID,......(and the rest)
then i execute the reader
Dim drBookingDetails As SqlDataReader = BookingDetails.ExecuteReader
and then i'd want to convert the read data, into the actual user name?
I have recently wanted to start work on an application that uses an MS-ACCESS database. The problem is that no matter what I do, the actual database will not retain any records added. I have followed the Microsoft examples to the letter and it does not work. As long as I have my app running I can add, edit and delete the records. As soon as I close it and run it again, all the records are gone. The mdb is not read only, I've checked it. I also decided to try the my video collection example program that is included with VB 2005 and it will not retain any records either. Is there any code I need to add to get this to work or is my copy of VB 2005 broken? This is extremely frustration because I plunked down a lot of money for Visual Studio 2005 Professional. This is a key feature and it should work. Microsoft had me do a reinstall and apply a couple of patches and it still did the same thing. They told me either I am not coding it right or my system is flaking out. I did a fresh install of Windows (I even formatted the drive before installing), and reinstalled VS yet again and even with that being the only program on there, it still will not work. So I installed all my programs again, restored my backups and now a day and a half later I am writing this.
View 9 Replies