Displaying Images With Global Variables
Oct 29, 2009
I need to send up to to selected images (such as an apple) to pictureboxe's on a results page. at the moment I'm using global variables to attempt to display the images like this:
Me.pbItem1.Image = New Bitmap("images\" & gstItem1 & ".jpg")
Me.pbItem2.Image = New Bitmap("images\" & gstItem2 & ".jpg")
I get a directorynotfoundexception 'Could not find a part of the path '\images\apple.jpg' error. I'm new to VB and think this must have something to do with the default path or something.
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Mar 23, 2012
I define some global variables of a class as follows:
Private Class MyClass
Private var1 as Decimal
Private list1 as List(Of string)[code].....
But I found that after this form is closed, all above variables, var1, list1, list2 still exist in memory. I thought they should be collected by gc since the form is already disposed as I confirmed.
Add: I have monitored half an hour after the form is closed. But these variables are not collected by gc. I have an automatic update procedure on the form which uses above variables.Since the above variables still hold values, the automatic update procedure is always called which causes exception. (One quick fix is to check if form.isDisposed in update procedure. But I do not think this is elegeant. Besides, these variables occupy memory.)
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Jun 9, 2012
I'm new in .NET programming.I have a class Form1 that includes Button1_Click event.Button1_Click creates a multiple Text Boxies at run time)Here is the class:
Public Class Form1
Dim shiftDown As Integer
Dim counter As Integer
[code].....
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Nov 25, 2009
I was working on window appication previously where i used to create global variables using modules in vb.net, but i found that in C# there is no concept of modules. so how can i create global vaiables in C#
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Nov 16, 2009
I want that global variables that sit in some DLL will be seen from other DLLs and EXE of that project.
I included in that VB file "Option Explicit On" as the first line .
But still no one can see my variables that were defined in that file . I made that all DLLs of that project depend to that one with the definition
I am using module and all my variables are public .
Option Explicit On
Module LPSoft_Core
#Region "Public"
[Code].....
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Sep 29, 2011
The user clicks a button, a new form is generated where the user enters his/her password? How can I keep an in-memory copy of the username?
For instance in web forms, I can just use Session ("User"). How can I replicate this with winforms?
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Mar 24, 2010
how can i create global variables and functions within a visual basic project?
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Aug 16, 2010
How I can declare global variables in vb.net that I can access them in all windows of my application?
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Feb 2, 2009
I'm creating an App that requires a few global variables (user information mostly) and I wanted to know the best why to declare these. I would like to create a "global" class with properties for each variable, but the property values reset with every instance of the class. Plus, what is the must excepted way to declare globals, I've heard placing them in their own module is as Globals is not a good practice.
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Aug 20, 2009
I've got a RPG style game I am putting together - mostly to teach myself vb.net. I am using alot of global variables to hold game values.[code]...
My question is -- I am trying to make a "SAVE" and "LOAD" the game's state. Is there a simple way to save the values of all my global variables, without having to type everysingle variable out. Is there anyway to call upon all my global variables at one time, and possible save/load them to a text file ?
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Apr 13, 2011
I want my "textbox.text" variable of my main form to be accessible by my other forms. Can somebody please guide me on making that a global variable?
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Apr 4, 2009
I have this little code here in vb 2008, I created a flag var to see if the user has clicked the button "enter" so the flag would be set to true. If its true then the game would begin...
I have a label that says "Press enter to Play", and if the user presses play the flag is true, the label visible is set to false. I have the keydown event to check if the enter button has been pressed, i checked if it works and it does, but the var of the flag is always false in my other subs...
Thats the thing with vb i dont understand is when you make a public variable, and when you change the value of the var in a sub, it doesnt change globally.
CODE:
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Jan 12, 2010
I am currently trying to program an online drawing program using the HTML5 canvas.the thing is, I need to have the current canvas saved somewhere globally. Static variables work, but they do not get shared across a Webgarden. This results in two different drawings being created.I will have to somehow create a new application object which is shared. I figured I will need an external application holding them.
1) How do I replace the application object with my own?
So either I will have to make my own program and call to it with remoting or use the ASP.NET session state server for application variables. I favor the Session State Server though.
2) How do I use the session state server for my own variables? How do I access it?
I searched high and low on the internet and only found the ideas mentioned above, but no help executing them.
I mainly code in VB.NET, but I can also understand C# code for examples.
A little info on my application:The client side has two canvas objects on top of each other. The top canvas object us used for drawing stuff, the canvas object below it holds the drawing in the end.When something is drawn, it is sent to the server in it's base64 representation. (getDataUri).The server puts this graphic on top of a stored Bitmap object through a Graphics object.
How the changes are being distributed to the other clients, I am working on that right now. Either I transfer the complete picture or each and every change that is submitted. This should work through Server Push. If this does not work thoroughly I will have to save and timestamp changes. A link to the current implementation, which is not currently fetching changes (but they get transfered to the server... With the problem that some reach one instance some reach the other on either w3wp in the webgarden) from the server is here: http:[url].....
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May 11, 2009
I need to write a simpe calc. program to add, mutiply, subtract and divide. I want to have two textboxes that I enter numbers in and when I click a button, +,-,/ or * a third text box will display the result.Rather than declaring my variables inside each instance of a click event I would like to declare them globally so I just need to perfom the calculation on them and display result. However declaring them globally doesn't work for me. I;ve tried the variables inside the btnAdd click event which works, but as I said I'd prefer to declare them onece globally.
Public Class Form1
Dim number1 As Double = CDbl(txtNum1.Text)
Dim number2 As Double = CDbl(txtNum2.Text)[code]...
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Dec 29, 2009
What happens if I do: Dim x As New Int32? Is a object of int placed on the heap? If it is, maybe your application would be able to access global variables faster if they were reference types.
A global variable as an value type should be somewhere at the bottom of the stack most of the time and it might take more time to get to this then to get a object from the heap. Unless it's the same story with the pointer of this object is also at the bottom of the stack of course.
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Mar 15, 2012
I know the title seems pretty trivial but i have an issue and i can't seem to get round it, i have the following code within one sub procedure..
Dim X, Y As Integer
X = 32
Y = 285
[code]....
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Mar 30, 2011
Is there an automated tool for VB.Net that will identify all global variables in a project?Short of that, is there any scripts that can be used that will facilitate a manual review of global variables?There seems to be tools for C/C++, but not for VB.Net:Tools to find global/static variables in C codebases there a tool to list global variables used and output by a C function?
EDIT:
My current approach uses the following VS REGEX searches:
For finding global variables:
[code].....
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Jan 13, 2012
To be honest I am fairly new at VB as a language, and I just came across a problem that I can't figure out. I have a feeling it's something simple...but here it goes.I created a set of string variable on my first form as follows:
Dim strpro1 As String = txtpro1.Text
Dim strpro2 As String = txtpro2.Text
Dim strpro3 As String = txtpro3.Text
Dim strpro4 As String = txtpro4.Text
Dim strpro5 As String = txtpro5.Text
I set strpro1 as a global variable in my module:Module Module1 Public strpro1
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Oct 21, 2011
At the head of a module, I wish to declare some global variables for use in various subs/functions.
What is the difference between.Dim x as string and Private x as string / Public x as string, and when would I use one over the other?
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Sep 14, 2011
Is it a good practice using global variables in a VB (.NET) application in order to exchange data between forms? As global variable I mean a public variable defined in a module and not a public member or property of a class. Moreover as my personal rule I never access a global variable from a class, but I pass the values to the class via functions.
[Code]...
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May 17, 2009
I try to create a sub main in a project but i can not.I have create a module called Module 1 and inside i have created a Main Sub which is intended to creta a thesaurus_form class instance , like this Code: Module module 1Public Sub Main()Dim thesaurus_form2= New Thesaurus_formEnd SubEnd module.Instead of this, once it has cretaed a first instance of the thesaurus_form class, it creates another one what i dont want at all..How can i do do make it execute the code which is inside the thesaurus_form_load sub..I also can not create a global variable or a staitc variable, because i receive this message.static is not valid in a member variable declaration.
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May 27, 2009
I have 2 forms in this application. One form is just a simple SQL statement that is generated into a grid. It displays columns/rows. From there I want to be able to click on a row and have the first column of that row transferred to another form. In the second form I want it inputted into a text box. So, the user doesn't have to copy the record back out of the form then open the other form and paste.
The form opening and closing is not the problem. The problem is getting the data to transfer from one form to another!! I am not sure how to do it.. I have only been coding in VB for a few days and no formal training. I am aware of global variables and would be willing to assign the data to a variable and then have it transferred into the textbox of a the second form.
I do not know how global variables work in VB. This is what I got so far............
'The user clicked the transfer button.
Dim obj As System.Data.DataRowView = grid.Current
MsgBox(obj.Item(0), vbInformation, "Selected Data")
[Code] .....
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Jun 23, 2009
I have a solution with 5 visual basic projects in it. Each project has an identical module with a few functions and constants - like handling our RS232 data, outputting events to log files, etc, etc..
If I want to change any of this common code, then I have to manually go through and change in each project. Is there a way to have a single module or class that's shared throughout the projects in the entire solution? I've considered creating and referencing a class library, but I'm likely to be making several little tweaks and changes to this "global code" and that method sounds like it could be just as awkward. Can I not just have a module that's visible to all projects, and compiled into each one seperately when the solution is built?
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Dec 4, 2009
Which is the best way to store global variables, in My.Settings or My.Namespace. The reason I ask is because I need to know certain boolean values if certain forms are open from other forms. At present I am defining Global Boolean variables in My.Application, which give the result I require.
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Dec 19, 2010
I was a VB6 programmer. And back in the day global variables, functions and subroutines were put in a module. The program started in the module using a sub named Main(). Now in vb2010 it looks like using sub Main() is possible only for console apps, which is not what I want, I'm still trying to write a windows app but it looks like everything has to go at the top of the starting form?? How is this good coding practice? Shouldn't public vars and functions be in their own module?What is considered best practice?Are there any links that would walk me through the differences between vb6 and vb2010?
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Dec 1, 2011
I'm developing a revised version of a system I have been using for years, but with all the advantages of .NET features that were not around when I first made this. It's proving a steep learning curve! So, when a user logs in through my Login.aspx page which simply compares username/password to Database record, the system creates a session variable containing the user's Username and various other things. There are two type of variable which will be common to all elements of this system
User Specific data, Username, Permissions, etc
Setting variables, drawn from a database of pre-set facilities which are setup within the system, some will determine which facilities work, how they work, and some will be dependent upon the User's permission. Obviously, I could set everything within the Session data, but that'd be inefficient wouldn't it? If I were to set these globally available variables in my App_Code, how would I go about setting this up so that, for example, those variables which require a database call, are set for the duration of the Logged-In session and do not require constant Database lookups? Further to that, those variables which are dependent on the session state, would need clearing on each LogOut. I am using VB.NET.
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Jul 5, 2011
i am creating a web browser using microsoft vb.net 2008 and i want to save all images only displaying on any web page in my browser. i have added check box to save images. browser.PNG when i click on check box , the browser will prompt to save only images files on web page.
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Nov 17, 2009
I am sending a write command "*IDN?", and then trying to read back the information and put that into a text box inside of VB6. The "*IDN?" command gives back some information about the piece of equipment. When I send this command and read back using the NI488.2 interactive control utility I see the correct information displayed. I am not sure what I am missing in my VB code. My gui only consists of a text box to display the information read, and a command button to start the sequence. Here is my code.
[Code]....
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Jan 8, 2010
I am making futile attempts to get the DataGridView control in a Windows Form to disply several rows of images. The images are all contained on the local disk. The names of the image files (all .JPG or .GIF files) are taken from an XML file. The XML is not the issue, since some of of the images actually appear.
The control has three DataGridViewImageColumn objects. Each column is set up to display a file called Blank.gif which is a transparent GIF containing a single pixel. Later, during the form's Load event, I replace each cell's Value property with the image that the XML file says should be in the column. The XML file contains the name of the file, and I use the System.Drawing.Image.FromFile() method to create the image object from the file name.
The behavior I am experiencing is that that only the very last row of images is properly displayed. The rows above it display the Blank.gif file as if they had never been assigned their intended images. If I change the code so that it will only iterate through three images (one row), all the images show up in the grid. If I then change the code so that six images are processed, only the second row of images is diplayed, and the first row shows only the Blank.gif file's image content. If I change the code to process nine images, the first six show up as blank, and the last three in the final row are properly displayed.
I have lost a considerable amount of my little remaining hair trying to fix this problem to no avail.
The code is as follows:
Imports System.Text
Imports System.Windows.Forms
Imports System.Xml
[Code]....
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Sep 13, 2009
I'm currently attempting a project where I need to display a series of images from a database, in thumbnail form, then fullscreen when they are selected. Next/Back arrows will be used to navigate through different pages of images. These images will be across a number of categories each one with a different table in the database. It is very important that the user can change the images in the database.
Rather than have a number of different pages and each image designated to a picturebox, I was wondering how I could make it so the program just displays the next 6-8 images from the database in the same picture boxes, giving a message when the it reaches EOF, This way the number and order of the pictures can be changed just by changing the database.
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