Specify A Code Module As The "Object Ref" Parameter CallByName?
Apr 23, 2012
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?
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Dec 10, 2008
One of the things that I think is really cool about VB.NET is how built-in functions and subs have extra help text in their ToolTips like "Expression: String expression to search for replace string." as well as the usual "Replace(...parameters...) as string" text. So are the pop up boxes with things like "CompareMethod.Binary" or "CompareMethod.Text." And finally I like how some functions and subs have different sets of parameters for the same routine. For example, New FileStream() starts with either a path (string) parameter or handle parameter, but none of the 15 sets of parameters contain both path and handle parameters. Is there a way that I can set up the classes and functions I write to use these things or do they only work with built in classes and functions? If there is a way, what are the proper names for them so I can look them up in the VS/VB documentation? I would be happy enough if someone would give me an example of them, but it would be nicer if I could go through the documentation and find out if there are other cool things that are related or near by.
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Oct 26, 2011
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
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Aug 12, 2009
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.
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Mar 29, 2011
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]....
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Jul 6, 2011
Why is the debug object missing when I try to type it in as in Debug.WriteLine.
When I type in debug intellisense substitutes sqldebug ?
I am thinking that I am missing a name space or library ?
Here is the list of imports in my module:
Imports System
Imports System.net
Imports System.data
[Code].....
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Oct 16, 2010
I'm making a little program in where i'm trying to invoke a method from a class dynamically with so called Reflection.
The class I'm trying to call is called ContactList and i try to invoke the property in this class called count. The assembly itself is called Contact.Exe
Now I have the following code where I make an instance of the ContactList class in the Contact.exe assembly:
[code]...
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Dec 1, 2009
I'm working on a project for my VB class at school. I am creating a form with several inputs and it calculates the total amount owed for a car sale. I have a text box for input of the TRADE IN VALUE of a car. the program is looking for a numeric input. If there is no trade in, how can i get this box to default to 0.00 so it doesnt error the program?
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Feb 16, 2012
Got a question regarding declaring a variable. Basically I have a module that writes to a text file using textwriter which is declared for the whole module to use at the top of the code. But what I want to do is clear the contents of the text file when the program is executed (using file.writealltext). The problem I have is that the file is obviously already in use as a result of the textwriter and the file cannot be modified because of this.
My question is: is there any way of declaring the textWriter object later on (not during the initial initialization of the module) without passing the object between functions? Setting the variable as inactive or something along those lines during initialization would be ideal.
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Apr 5, 2010
I am using VB2008 In the Form1, i have coded
Public Function getText(ByRef ctlName As String) As String
getText = Mfg.get_TextMatrix(Mfg.Row,Mfg.Col
[Code]...
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Apr 17, 2010
i am trying to make a app that loads a keyboardhook from a module on startup, but the problem i am having is unless i load the keyhook from the form, the app just closes immediately.
what im trying to accomplish in the end is the module will will check a 'user settings' file, depending on the settings it will show a form or load the keyhook. but this is where my problem is, if i set the keyboardhook to load from the sub main in the module the app will just close immediately unless (as far as i can tell) i am always typing something
if i set it to load from the form it stays open, ive tried creating a second module and loading the keyhook from their but it still closes i uploaded a copy of the keyhook module if anyone want to test it / check out the code... all it does right now is pop up a msgbox on every keystoke, for testing purposes,
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Jul 2, 2009
my application starts executing a module. it runs process.
Quote:
Public Sub SubMain()
'run process
.
.
Application.Run(New frmLogin)
End Sub
But now I want to add a splashscreen. But when I go to set it to "My Project" / "Application", I can not to set this module as start object.How I can set my module as start object and before to show the splash screen?
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Dec 10, 2011
I start making app for one Facebook game (to make easier playing that game) Key thing is that I need to get few parameters from HTML source when game is loaded in WebBrowser control. But, problem is that parameters doesn't really exist in HTML source. They are generated in game loading and when I you Firefox or Chrome and click "View Source" I can't see them. When I use FireBug on FF or Chrome developer tools I see them like this on picture:
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Sep 10, 2011
I have various shape objects, and I want each unique shape to implement a saveToDB method that simply calls a DB object that implements a Save method with an object as its input paramter. This DB.Save method will be a long case function that implements the proper SQL commands based on the type of attributes possessed by the input parameter object.how do I implement the SaveToDB method in my Shape class? Is it something like this:
Function Shape.SaveToDB
DB.Save(Me)
End Function
The goal here is to let each shape save itself without it knowing anything about database operations; I want to isolate db-specific information in my intermediary DB object, so the DB object will have to figure out what type of object wants to be saved into the SQL database and then execute whatever SQL instructions are needed. And then if I override the SaveToDB method in each shape subclass, I can avoid the case statement entirely, replacing it with a series of unique methods such as db.SaveCircle (ob), db.SaveSquare (ob), etc., sincle the caller already knows what it is.
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Aug 20, 2011
how to apply the code in the module?
this is my code:
sqlstr = "update StudentGraduateTable set LastName ='" & txtlastname.Text & "'," _
& "FirstName ='" & txtfirstname.Text & "'," _
& "MiddleName ='" & txtmiddlename.Text & "'," _
[code]....
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Dec 23, 2010
I have a method/sub that takes an object as a parameter, then it scans through a panels controls and trys to find if it is in the window.
Public Sub removetype (ByVal findobject As Object)
Dim types As System.Type = findobject.GetType
For Each ThisCtrl In Flow.Controls 'flow is a panel
[Code]......
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Apr 5, 2010
i am in the process of developing a school project(Restaurant management system) I am adding misc tools and modules to it and i need code for the email sending module i.e. just one which sends an email to a specified address. [Code]
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May 18, 2012
I have to call PS commands from a VB.NET program. This works fine if I'm calling standard PS commands, but if I have to call a command that lives in a 3rd party module I can't seem to make it work. At the PS console I can type Import-Module MyModule and then I can call the commands in that module. I tried the following but it doesn't work, I still can't access my command from within the module:
Dim PowerShell As Management.Automation.PowerShell = PowerShell.Create()
Dim PowerShellCommand As New PSCommand()
Dim PowerShellCommandResults As Object
[code].....
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Apr 19, 2010
I've created an MDI application, on which I launch a macro using a tool bar button. The Sub is located in a module and I don't manage to udpate ToolStripStatusLabel from that sub.My MDI form is called "MDIParentMain"and I use the following code to make changes on oolStripStatusLabel (called "statuslabelMDIProgressbar"):
Sb test
Dim myform As MDIParentMain
[code].....
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Oct 30, 2011
I'm trying to change the reference of a variable passed from one form to another in the constructor of the recieveing form but after I've changed it the original reference still remains in the source form. Why is this and can I force it to accept the new reference?
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May 15, 2012
I have a TreeView, which contains nodes. When a user clicks on a node, corresponding CrystalReport document should be created and displayed.For example, names of my nodes are: "PeriodReport1", "PeriodReport2", "PeriodReport3". My CrystalReport documents are named same: "PeriodReport1", "PeriodReport2", "PeriodReport3".How can I create and display right type of crystal reports document? I could do something like this:
select case reportName
case "PeriodReport1"
[code].....
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Mar 22, 2011
I have an object, called 'PERSON' This person object has a title, firstName & Surname property as well as many other which are at the moment irrelevant. It also has a read only property called Fullname which concatenates the two or three parameters mentioned above depending on an optional parameter 'withTitles' passed over when you call PERSON.FULLNAME
PERSON.FULLNAME(true) <- Will add titles if there are any
PERSON.FULLNAME(false) <- Will give the name without the title
Public ReadOnly Property FullName(Optional ByVal withTitle As Boolean = False) As String
[Code]...
I get an error: PERSON does not contain a property of 'FullName'. If I change this to any other property that does not take a parameter it works as expected. Now I'm guessing that the binding procedure can't handle optional or mandatory parameters for object properties, is this right? Is there a better way to do it? I thought about looping through the collection to add them manually but that kinda defeats the object of DataBinding!
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Aug 25, 2010
I'm currently working on being able to import a DLL written in Fortran into Visual Basic. I've got all the basics down, so now I'm trying to take it a step further. The title basically says it all, but I'll explain what it is I'm trying to do anyways.
For kicks and giggles, let's just assume I want to pass an object that has three double values in it, possibly representing a point in space in three dimensions. In my Fortran method, I want to take that object, print out the x value, then change the x value to 7.5. Here's my Fortran code that does just that.[code]...
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Aug 29, 2011
How can I get the name of the object that was passed byref into a method?
Example:
Dim myobject as object
sub mymethod(byref o as object)
debug.print(o.[RealName!!!!])
end sub
[code]....
I'm using this for logging. I use one method multiple times and it would be nice to log the name of the variable that I passed to it. Since I'm passing it byref, I should be able to get this name, right?This would give you the parameter name in the method and it's type, but not the name of the variable that was passed byref.
using system.reflection
Dim mb As MethodBase = MethodInfo.GetCurrentMethod()
For Each pi As ParameterInfo In mb.GetParameters()
[code]....
If you put that in "mymethod" above you'd get "o" and "Object".
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Nov 2, 2010
I'm writing a solution where the data entities are passed to clients using datasets through a WCF service, with nHibernate as ORM. My predecessor has written some translator classes, converting datasets to entities and vice versa. In most cases he's declared the return object as a parameter for the object.
For example:
Public Shared Function CreateEntity(ByVal ds As DataSetObject, ByVal entity As EntityObject) As EntityObject
Dim row As ds.EntityObjectRow = ds.EntityObject(0)
entity.Id = row.Id
[code]....
He's not with the company anymore, so I can't ask him why he's done it this way. Hence my question here. Is there some performance gain, or traceablity thing with nHibernate by using the first implementation rather than the latter?
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Sep 18, 2010
My boss has asked me to set up DotNetNuke's Survey Module and make a few custom changes to it for a client. But I'm having trouble just getting the bare-bones code to run properly!Downloaded both the source & install folders from [URL] Created a new VB Web Application Project Took out all the default pages Copied the Survey source code into the VB Web Application Project in exactly the same structure Made a batch script that creates an installation folder identical to DNN's install folder (double-checked by running a folder-diff on it, and all files/folders were identical) Zipped up my installation folder using 7-zip The source code compiles perfectly. But even though the files/folders are identical, DNN's zipped package will work properly on my DNN site, and my own zipped package will fail with this famous error message:
Error: Survey is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Could not load type 'DotNetNuke.Modules.Survey.survey'. --->
[code]....
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May 20, 2012
Reasonably experienced programmer but newbie question on VB Express 2010: I have coded my 1st attempt at my project. I now want to save the work I have done and branch the code but be able to go back to what I did before if I screw up. What is the best practice? Do I get any help from Visual Studio. I could save a copy of the code in another directory or different file name
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Aug 25, 2010
creating the DNN Survey Module from source code
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May 13, 2009
I have a Excel - VBA problem that I can't seeem to get around. I have written some code to search through excel sheets and return the values it finds. The code is written in a module, and when I run it by clicking the play button at the top of the VB editor it works perfectly.
However I have noticed that I need to link it to a button (on_Click) in sheet1, I have tried copying the code into the button sub, it throws up an error: "Method 'Range' of Object '_Worksheet' Failed" When it gets to the 'UpCount' line. This piece of code steps across a worksheet and when a "y" is found it copies the values form a cell at the top of the worksheet (which uses the upcount formula as the cell to be copied changes), and then it also copies some values to the right of the cell containing the "y" value.This code all worked fine when it was ran from the module2 window using the play button a tthe top of the VB editor page, it is just now it is attached to the commandbutton I am experiancing problems!
Sorry I use ActiveCell as I don't really know how to use anything else! And being new at the coding game it helps me to 'see' what is going on..
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Feb 22, 2010
I am trying to send an object created in JavaScript to an ASP.NET PageMethod. This object mirrors the properties of an existing custom business object, so i was hoping that i could pass a single object instead of a parameter for each property. I am getting an error "Unknown web method SavePart when attempting to use this method.
Javascript:
function() {
var pt = { Id: 1, Onhand: 20, LowPoint: 30, __type: 'Custom.Objects.Part'};
$.ajax({
[Code].....
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