How To Get The Function Pointer From Class
Nov 5, 2011
Public Class Form1 Public Declare Function GetModuleHandle Lib "kernel32" Alias "GetModuleHandleA" (ByVal lpModuleName As String) As IntPtr Public Declare Function GetProcAddress Lib "kernel32" Alias "GetProcAddress" (ByVal hModule As IntPtr, ByVal lpProcName As String) As IntPtr
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim hmod As IntPtr = GetModuleHandle(Nothing) 'Work Dim addrs As IntPtr = GetProcAddress(hmod , "TestFunction") 'Not work, always NULL why??
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Jun 11, 2011
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?
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Jan 4, 2012
I need to access a DLL function which has a void pointer argument (probably written in C/C++). In VB6 it could be accessed by declaring the argument as 'Any'. VB2008/VB2010 does not know this variable type 'Any'.
I tried instead: Object, IntPtr, UIntPtr, Int32(), Long e.t.c. but there always occurs a compile error or a runtime error.I did a lot of Internet investigation but could not find any answer.
Is there a solution to this?
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Oct 2, 2009
How do I distinguish copying data and a pointer when using a class?E.g.
public class myparams var1 as integervar2 as intergerv3 as stringend classmyvar as new myparamsmyvar.var1=1myvar.var2=2myvar.v3 ="hh"othervar as new myparams
I want to copy all of myvar data into othervar in one go.. without doing
othervar.var1=myvar.var1 etcusing othervar=myvar"
Looks like its just copying the pointer of myvar into othervar? Can I copy all the class data in one go? VB2008 user
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Jul 15, 2010
I have an open source project I converted to vb.net. I solved all the errors, except for one. This is the C# line
[Code]....
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Dec 29, 2010
How can I declare pointer to pointer in ATL. Actually I have a handle which I want to pass by address to function. As shown below
STDMETHODIMP Function(HANDLE* hHC) //HANDLE declared as void * so actual type is void **
OR
STDMETHODIMP Function(LONG **hHC)
And want to access this function from the VB client.
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Feb 21, 2009
Whats the function for converting a string that contains a class, into a class?for example
Public Class Desk
Public GetVar=1
End Class
Dim T = "Desk"
Dim Furniture = New T
What do I have to do to T to make it into a class from a string?
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Mar 11, 2011
Im creating a class that will have my common database functions. So for example I've created a function db_con in a class called db_functions.
How do i use that db_con function in for example my homepage vb code?
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Mar 24, 2012
I have a Class, which I create an instance of in order to use, however I have a couple of functions (which don't really relate to the instance data) which I want to use when an instance hasn't been created.
Visual Basic .NET (2010)
Example of what I'm trying to do:
' Log a user into the system (this works)
Dim hedwig As New CustomSecurity
hedwig.Login("username", "password")
[Code].....
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Oct 31, 2009
is there any way to extend upon a procedure itself?like i want to be able to do the following
Code:
public sub test()
msgbox(special())
end sub and it should popup a string, let's say "cool", plus i shld be able to use special() in every single sub but if we call special() from a function it should be rejected. how can that be done?
also, we should also be able to do the following
Code:
public sub test()
msgbox(specialvariable)
end sub whereby specialvariable is accessible by every sub.
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Nov 3, 2009
I realize that this is a very basic question, but it's been a long time since I've played with VB. Why can't I call the Synch() Sub/Function in my CMMS_SCAD_CLASS class from my Main module? I get the following compile-time error:
'Synch' is not a member of 'ConsoleApplication1.CMMS_SCADA_CLASS.'
Main class:
HTML
Module Main
Sub Main()
Dim meterClass As New CMMS_SCADA_CLASS()
[Code]....
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Feb 7, 2012
So, I am reorganizing a winform application I wrote to make it more readable and maintainable. The previous structure I used had:
1- a login form with some connection objects
2- an import process start form with some import objects
3- a log writer class that receives data from the import process and writes a log file at the end of the import process
The code quickly got too messy, so my goal now is:
1- a login form with only form events
2- an import form with only form events
3- a class with all the functions
Basically, my class with all the functions (3) looks like this:
Public Class MyProgramMainClass
Public Function test()
Dim testing As String = "test"
[Code].....
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Apr 1, 2010
I want to create a function inside my class that will return a boolean on the existence of some data within any structures created with the class.
Public Class MyObject
Public Object1 as String
Public Object2 as String
[code]....
What I don't know how to do is refer to the object that called the function to get values, including the number of items in the referring objects array.
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Sep 14, 2011
I want to be able to pull data from 6 text boxes with identical names (other than a number at the end) in a for loop here is the error:
[Code]...
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May 31, 2011
How do I call a function in a visual basic class library?
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Oct 21, 2009
the way i could use VBA to check if a function say function1 is present in class1. if the function is present display 1 else display 0.
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Oct 28, 2008
I am working on this project and this question seems to be stupid, but I am not really getting the point.I have the following class:
Code:
Public Class ConnectedServer
Public MYPORT As String = "8000"
[code].....
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Mar 6, 2010
I am new to vb.net and would like to be able to convert the following code to it's own function - either inside the current module or better yet in a seperate class.This code currently runs in the KEYPRESS event and ensures only numbers, decimal point, 2 decimals etc. are entered and not letters. Works exactly how I want it but would now like it in a function.I need this code in numerous text box controls but I would rather just call it somehow with a function.
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Oct 30, 2010
What is the difference between Private Sub /private Function / Private Class and to use them?
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Jan 8, 2009
I want to create a function (class?) that will have stored the coordinates(values) of my mdiforms, so I can call it whenever I want to dispaly the mdiforms. I want to avoid retyping again and again (in every mdi form) the above Me.Top=5 Me.Left=150 on forms load.
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Dec 11, 2010
Okay so what im trying to do is make a simple particle system in VB (Yes i know this isnt a ideal setup). Im going to have particles dieing and spawning new ones tho, To do this i need to be able to pass a function to the particle when its created then call that function when it dies. Is there a way to do this by passing function pointers?
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Jul 19, 2011
Let's says I have a class called Customer :-
Code:
Dim Cust as New Customer("Fred")
I also have a function in a seperate class :-
Code:
Shared Function Example(Example As Customer)
How do I refer to the class itself from within itself? For example :-
Code:
' from within the Customer class, call the Example function
AnotherClass.Example(Me??)
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Mar 15, 2010
Since the string class does not have a Left method, how would you do this in VB.Net. I could use String.SubString(0, x), but the problem with this method is that it throws an exception if the String is not at least x characters long. Should I use the Microsoft.VisualBasic.Left function instead?
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Jun 7, 2009
I have created a class and I have added it as a resource and imported yet I don't seem to be able to use any of its functions.
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Jul 19, 2011
Now to working with Visual Studio Solutions, but I am trying something very basic but no joy. So in my project I have a folder App_Code and in this I added a class called Test.vb and added a simple function
[Code]...
But in my Default.aspx page I am struggling to find the correct syntax to call this method. Also it doesnt seem like my Test2.vb class is correctly included in the project because If I make a type the project still builds successfully when it shouldnt
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Sep 8, 2010
I work in MS Visual Studio 2008, I have a VB.NET Solution which has three Projects, BusinessObjectLibrary (object properties), DataAccessLibrary (object functions such as selectAll, exportToExcel) and WindowUserInterface (UserForms c/w Controls)In my WindowUserInterface (project) I have a form called "rolFormGrid.vb", on this form, I have a DataGrid that gets filled with a function called "selectAll" when the form is loaded, I also have a button that calls the function "exportToExcel" and I have a Progress Bar called "rolProgressBar" ***.
In my DataAccessLibray (project) I have a class called "ROL_Adapter.vb", and in this class resides the function called "exportToExcel" which has all the code to create an Excel Workbook. When this function is being called, it can takes close to a minute to export to excel. We all know how users can be impatient if they do not see anything happening in the foreground when an application is working, that is the reason I want the progress bar.
[Code]...
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Dec 4, 2011
I want to create a new instance of a class when I click on a button, but I need to interact with members of that class using other controls on the form, so I need the class to have a global scope. I know I could call the new class in formload, but the class creates certain variables that need to be current. If it is done on formload, the variables wouldn't be current, because if the class is created at formload, it would have different info at that time. Surely, there must be a way to create an instance of the myClass from within a sub that is accessible from other subs of the same class.
[Code]...
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Feb 24, 2010
-edit- nevermind i was lucky and didnt need to change much and have this test working.I am doing a quick test and i need to choose the full path to a function.in C# i can write namespace ABC { class DEF { static string Test() { return "A test"; } } } and can access it with ABC.DEF.Test() i tried
Namespace ABC
Partial Public Class DEF
Public Function Test(ByVal v As String) As String
[code]....
and i got VBTest.ABC.DEF.Test(). How do i get rid of VBTest which is the name of my project?
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Nov 5, 2011
Im getting the following error on the code I transleted from C# to VB.NET below (original code can be found here:
Class 'QueryParameterComparer' must implement 'Function Compare(x As oAuthBase2.QueryParameter, y As oAuthBase2.QueryParameter) As Integer' for interface 'System.Collections.Generic.IComparer(Of QueryParameter)'.
[code]......
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Apr 12, 2009
I have a class called Customer. It has some property like custID,custName..etc. Inside Customer class I have a function which returns an array of customer.
I wrote a function like this :
Public Function InitLoadCustomerDetails() As Customer()
sql = "SELECT* FROM tblCust"
ds = classDC.queryHandler(sql, "InitCustomerDetails")
Dim customerArray(classDC.maxrow - 1) As Customer
Dim currentCustomer As New Customer
[Code] .....
But it is not returning an array. Just a customer variable??
Public Function InitLoadCustomerDetails() As Customer()
Return customerArray
End Function
Fix this to return an array of customer!!
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