Passing Multiple Byref Variables / Variables Fail To Change Calling Funct W/ Invoke
Sep 27, 2010
I have code, shown below, that works all except for 1 thing: The variables being passed byRef get passed, but once modified in the else section of the "if me.invokerequired" code of RecordData, the variables are never updated in the calling function. To reiterate, the calling function does not receive the updated data that is in the variables custid and amt.When debugging, I see the data change in the else section of "if me.invokerequired", but once it returns from the callback the data is missing.[code]
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Mar 8, 2011
Question 1: What is the difference between "Background Worker" and "Worker Pool" as indicated within the MSDN samples provided.
Question 2: I noticed while using, AddressOf _Function_, variables cannot be passed; what would be an efficient solution to this?
Question 3: While using multithreading is it required to invoke before setting variables, or only form properties?
Question 4: While using System.Net.Sockets is it safe/efficient to use Application.DoEvents while waiting for new data; or would be using a Do While loop be fine without DoEvents since the action would be multithreaded? Note: there can be up to 2000-3000 sockets in use at a time.
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Aug 26, 2011
I need to pass two variables/strings to a background worker at the same time. he background worker needs to return the first variable, and the time consuming boolean result of the second variable.From what I have read, I can only pass an object that contains multiple variables.This is where I get confused
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May 5, 2012
I have a class in vb.net defined as public class A
class A is created on Load and gets called once per program loop
The constructor for class A includes the argument (byref Value as long)
I have a global variable called varB that is passed to class A on creation.
now why when varB is altered during the program loop, the change is not reflected within the class?
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Mar 30, 2010
I have my own little tutorial about passing variables, and if you'll look at the code below, you'll see how I am passing the variable from one sub to the secondsub. Here's my question, how can I pass a value back from the 2nd sub to the 1st? So if I want to sum intA plus intB, and want to return that value to the first sub, how do I do that? [code]
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Nov 10, 2010
I have an application that has several forms in it. On form #1 I am declaring the variables:
Public payPeriodStartDate, payPeriodEndDate As Date On form2 I have this:
Public Class Form2
Public payPeriodStartDate, payPeriodEndDate As Date
Private localVariable As Integer
What I'm trying to do is to call payperiodStartDate and payPeriodEndDate and to use those variables in the following query:
[Code]...
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Jun 15, 2011
In a form I am designing I have a picture box. I want this picture box to display an image from My.Resources. However, the picture to be displayed will change based on conditions. I have written a statement to store the name of the picture I want to call in a string variable called strPicName. So how do I properly use the string variable to get the line of code below to work?[code]...
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Apr 21, 2011
I have a program that I am writing that asks the user for information.The program takes that info and passes the strings to a module that has a set of case statements for comparison.The program was working just fine yesterday, and now it acts like there is no information being passed to the module for comparison.[code]
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Jan 21, 2009
I have an ASP.NET 2003 web application. There is a .vb module file within that application. Is there anyway I can pass a session variable into this .vb module from a aspx.vb page?
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Sep 16, 2009
I have an application I have built which is basically a decision matrix. I would like to add it to a current database as a button on the form. When the button is clicked I would like to pass header information to the executable (two variables).
I can modify the code but I am not sure where to begin?
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May 17, 2012
I have a Form1, the user types a "Client ID" in a textbox if it's not a valid one, it opens a Form2 in which the user selects the correct "Client ID", once selected he presses an OK button. And there comes the porblem.. it opens a new Form1 with the Client ID that he selected from Form2, but I still have the first Form1 opened.
I have two Form1 opened...
I which to keep the original Form1, but with the value sent from Form2..
I'm using this code:
Code in Form1
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
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Apr 27, 2009
I am using Visual Basic 2008 for this assignment. I have a project that I am working on and I need to be able to use form variables across the entire project.
I have looked on other forums but no definitive answers.iI have declared variables as such Public StrV21true As String and "Public StrV21False As String
Now apon assigning a string to the variable with an If Then Else Command, I go to the next form expecting that the assigned variable will be available for use in this second form but to my dismay it tells me that the variable has not been declared and will not even show up in Intellesence. Like I said before from research on the net I am using the public class in Form 1 to hold the variables and am kind of expecting the public class variables to be available through all the forms in the project. I would really like to know how to do this so as I can finish my project for class.
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Feb 8, 2012
I'm having trouble passing Variable information through classes, here is what I mean.
Example:
On my Form I call on Test.Result
Test is my Class
[code].....
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Nov 19, 2010
I have two forms and I'm trying to pass a declared variable from form1 to form2 and then pass that variable in a sql query that I have in a dataset that is bound to my form. I know that my query works but it's not producing any data. I have debugged my form and can see the data being passed in the variables elsewhere on the page but I'm not sure of the syntax within the query.
[Code]...
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Jan 24, 2012
I am getting an "Automation Error" with the following:
Dim sheetdate As String
Dim sheetdate1 As String
sheetdate = "7/1/2011 23:59:0"
[code]....
I need to pass two variables to the WHERE clause. If I manually input 'sheetdate' and 'sheetdate1' into the clause -
WHERE (((ticketorders.TimeStamp)>#7/1/2011 23:59:0# AND (ticketorders.TimeStamp),#7/2/2011 23:59:0# ...
everything works fine. The problem is I have multiple sheets and I would rather not have to add the entire sub-routine to each and every sheet. My thought is, it would be easier to create a PUBLIC sub and pass the time values (sheetdate and sheetdate1) to the WHERE clause.
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May 21, 2009
I've got a form in my MDI container. Lets call it Form1. I now want to show a dialog box (Form2) and pass the primary key from Form1 to Form2. Do i create a public function on Form2 called SetMe() or Do I create a public on Form1 And read from it? From a best Practice point of view, How would you go about it?
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Dec 9, 2009
I�d like to pass the username and password within a link to a browser using VB code. This link works "http:192.168.0.26:81/forum/login.asp?username=test&password=test" when used manually but not when used within a code:
Dim username, password As String
username = "test"
password = "test"
WebBrowser.Navigate("http:192.168.0.26:81/forum/login.asp?username='" & username & "'&password='" & password & "'")
The username and password are passed onto the web page within single quotes as �test�.
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Aug 31, 2011
I am passing 2 variables from form1 to form2. In form2 I want it to where it will filter my dataset according to the variables in form1, before it's displayed. In form1 it works, but when passing those values (JT & WRID1) to form2, it doesn't work.
Form1:
Public Class Form1
Friend JT, WRID1 As String
Private Sub ShowForm2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ShowForm2.Click
JT = Me.dgvWLog.Rows(dgvWLog.CurrentRow.Index).Cells("dgvJT").Value.ToString
WRID1 = Me.dgvWLog.Rows(dgvWLog.CurrentRow.Index).Cells("dgvWRD1").Value.ToString
End Sub
End Class
Form2:
Dim s As New Form1
Dim JT As String = s.JT
Dim WRID1 As String = s.WRID1
Me.DataSet.Form2_Get.DefaultView.RowFilter = "WT = '" & JT & "' And WRID1 = '" & WRID1 & "'"
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Apr 12, 2011
I am working on a program, and I would like to have the program pass a name from on form to another.
This is my code :
form 1 :
Public Class Form1
[code].....
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Apr 13, 2011
Below is the code i am using to read and update the system environmental variable. This code is working fine when i am executing .exe on Local Machine. I am getting problem when i try to access this .exe from Browser(using citrix i am doing this) and invoke. when i invoke from browser its going to catch block and displaying MsgBox("Unable to Create LDAP Key.
[Code]...
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Nov 11, 2011
I am fairly new to VB.NET so I research alot when I run into bugs. Problem is I cannot find a solution to this, or anything remotely dealing with it. I am developing software to connect to a remote mysql server, run a query, and come back with a dataset. I have run this query against the server through a mysql prompt and have received a result successfully. But when i try to run this query from my app, I get an object reference error.
Through debugging I have found that the @ character used for variables in sql strings, is causing the problem in my code, but i cannot find a way to pass this query to the server without visual studio throwing errors. Every answer to the use of variables that I have found, suggests specifically stipulating the variable values in my code, which I do not want to do.
[Code]...
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Sep 2, 2009
I'm having an issue where I need to pass the value in a variable from one sub to anotherHere is the scenario. I have two forms; Main_Form and frmClient. I take a value from frmClient and pass it into a sub called Form_Activate located in Main_Form. I then need to take the value from Form_Activate and use it in a sub called when the user selects a menu item in the toolstrip.Starting point is frmClient and the code there is this:
Private Sub Button1_Click(ByVal sender as System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim Client As Integer
[code].....
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Sep 28, 2011
I have a form that holds min two timers, One is a 72 hour timer and one is a 12 hour timer.
What I am trying to do is have both run at the same time, when the 12 hour timer expires it'll bring up a form informing the user that in 60 hours the machine will reboot (or they can just hit reboot). When the 72 hour timer expires it reboots the machine.
BUT I know my managment is going to want to be flexable. e.g instead of 72 hours make is 54, and instead of 12 make it 6.
I wish to avoid using global variables
This is the code for the 12 hour one, How do I call it and set i12sec and i12min?
************************************************
Private Sub t12hTimer_Tick(sender As System.Object, e As System.EventArgs, i12sec As Integer, i12min As Integer) Handles t12hTimer.Tick
t12hTimer.Interval = 1000 '1000 Miliseconds = 1 second
[Code]....
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Oct 20, 2010
I am trying to complete a homework and seem to get stuck at the last point of passing arrays and avriables to a sub to do the calculations to produce the desired result of sales tax but can;t seem to accomplish that so far.
Public
Class
frmSalestax
Dim
[code]....
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Jun 17, 2009
I created a program a while back, in the traditional VB.NET way by drawing a bunch of forms. I have started playing around with creating the forms at runtime using classes. I have a placeholder form called frmStartup which merely calls the CreateLogin() sub from the CreateFormClass. The CreateLogin() sub creates a new blank form, then calls the grpbxLogin(), btnSave() and btnExit() subs from the FormElementClass which adds all the buttons and textboxes to the form. Within the FormElementClass, I have associated btnSave and btnExit with event handlers. These even handlers call subs from the DataProcessingClass. The event handler for Exit works just fine.I am having a problem with the Save event handler. Precisely, I don't know how to pass either the username or password from the Login form to the btnLogin_Click() sub in the DataProcessingForm. I have tried using Me. and frmLogin., but the program doesn't see either of those. If the Login form is an instance that is disposed of once another Sub is called, then it won't exist later on to call from. I have tried declaring variables and passing those along to btnLogin_Click, but no matter where I put it, the program doesn't see txtbxUsername.Text or txtbxPassword.Text. Not even from within FormElementsClass, which is were the boxes are created.Any ideas on how to pass variables in this case? I am not even sure what you would call this such as passing between classes, or passing between instances.[code]
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May 15, 2012
I deleting the files of certain age in a directory and also need to write a log file. So my question is how can we pass a variable from one method to another?
Example : Dotnet.Explorer
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Jan 12, 2011
I have an application that I'm building which pulls dates from a database. The start value is stored as payPeriodStart date and I add 7 days to get the end date. What I need to know is, is it possible to store those values and pass them to a Stored Procedure? Currently my stored procedures have "static" dates in them i.e.:
where dateadd (n, Timestamp, '12/31/1899') - ([LoggedIn]/1000)/60/1440+1 Between '10/3/2010' and '10/10/2010'
Here is my code for the form that will be passing the variables payPeriodStartDate and payPeriodEndDate to the stored procedure:
Code:
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles startpayrollButton.Click
Dim ssql As String = "select MAX(payrolldate) AS [payrolldate], " & _
"dateadd(dd, ((datediff(dd, '17530107', MAX(payrolldate))/7)*7)+7, '17530107') AS [Sunday]" & _
"from dbo.payroll" & _
[Code] .....
And lastly since I'm calling those variables payPeriodStartDate and payPeriodEndDate, I assume that my sql query will have to change as follows:
where dateadd (n, Timestamp, '12/31/1899') - ([LoggedIn]/1000)/60/1440+1 Between payPeriodStartDate and payPeriodEndDate
Is that correct?
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Feb 8, 2010
Also, I'm sure I explained myself well enough, but just in case I didn't, I've attached a jpg with form/control examples w/code
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Jan 24, 2011
I have a form that has a button, when clicked it pops up a Dialog Form. Within this dialog form the user needs to select some data and when the user is finished they click the OK button. Once they click the OK button it needs to return an integer back to the previous form.I created a Dialog Form and tried calling it via the code below:
Dim intResult as Integer = frmData.ShowDialog()
Debug.Writeline(intResult)
However, it seems I can only return DialogResults (Abort, Cancel, Ignore...)I was wondering how I can try this without having to create a public variable and storing the result there.
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Jan 7, 2012
VBasic / VS2008 / .NET 3.5 / Meas Studio 8.5 I've searched and seen a number of convoluted ways of doing this but.... What I am trying to do should be simple and in my mind (and from previous experience) it should work. It doesn't At least not after 10 hours of tweaking, editing, researching....
Straightforward project, 3 components - MainModule, MainForm, CNCNoForm. I declare public var NCPgmNo in the module. I open the CNCNoForm from the MainForm. This form has 2 controls - Numeric Up/Down Box & Close Button. I enter a number in the Num box (read only property is set to false), then assign the value to the var. NCPgmNo in the value-changed event sub. I close the form, returning to the MainForm. The variable does not pass even though it is public and declared in the module. I tried removing it from the Numupdown event and assigned the var before 'me.close'. Still N/G.
If I put a breakpoint right after the line that assigns the var, it is correct. It just does not pass to the MainForm. I started with a textbox, then changed to a Meas. Studio Numeric control, finally Numeric up/down. Same results with all 3. I though the CNCNoForm was broken so I removed it from the project and rebuilt it with a new name (yes name references in the MainForm and MainModule are correct). One other thing. If I call the CNCNoForm repeatedly, it reads the previous value. I am ready to give up computers and take up farming or hiking.
[Code]....
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