I have a form which creates controls dynamically and adds event handlers by itself (already coded that part). As for now, I have a hidden table with the object list which loops through the controls and finds it by name (using the Me.Controls collection). How ever, does anyone knows if a dynamically created control may have a special unique code ?
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how to use a webcam to take a photo on a Windows Forms application,Now what I need, is to identify which device I'm using to take the photo, in case I ever happen to have two or more similar devices connected to the machine.Currently our setup involves an Asus EEE PC deployed at our location. The machine has an in-built webcam which we are using in the application as described above.Somewhere within this code below, the default device is being identified and selected for taking the pictures we need.
Imports System.Runtime.InteropServices
Public Class Form1
Const WM_CAP As Short = &H400S
[code]....
Now what I need is to find the code that does this identification, and then hardcode the device identity into that code so that if I ever attach another (USB) webcam to the machine in future, it does not inadvertently take a photo from the wrong webcam.
Admin users can add HTML content to a website via a CMS textbox control.
When this content is displayed to a website visitor, I'd like to identify the presence of a HTML table (added by a Admin user using the CMS) and display an option for visitors to export that table.
I can handle the exporting, but identifying the HTML tables has me stumped.
I am debugging an assembly which I loaded dynamically with Assembly.Load(Byte[]), but I am facing some problems.First of all, I can't move the yellow arrow in Visual Studio 2010 to step into other lines of code, and also I am getiing exceptions ("Cannot find the method on the object instance.") when trying to do a quick watch on objects from a third party library (controls from Infragistics for example.)
Dim data = My.Computer.FileSystem.ReadAllBytes(file.FullName)
Assembly.Load(data)
When using Assembly.Load(String), everything works fine, and there are no problems.
Assembly.Load(IO.Path.GetFileNameWithoutExtension(file.Name))
EDIT: I tried loading the debugging symbols for my assembly with Assembly.Load(byte[]. byte[]), but it I sitll get Exceptions when trying to debug objects from third party libraries.
My goal here is to get stack trace information from a dynamically loaded assembly. If the dynamically loaded assembly just throws the error back to the caller, the stack trace information doesn't tell you the location in the dynamic assembly where the error occurred. If I throw my own exception, passing in the original exception, it will get added as an inner exception and will have the information need. I'm trying to avoid changing all my dynamic assemblies to throw new exceptions.
Public Class ErrorPlugin
' Example Function from plug in DLL
Public Function SimpleExample() As Double
Dim RentedUnits As Double = 42
[code]....
I have two usercontrols. One is loaded statically another dynamically.In the aspx page I can write as follows for static user control.
ProgramAddSchedule.onNewProgram += new AddProgram.OnNewProgramClick(onNewProgram_btnHandler);
But dynamically loaded control's event I am not able to get
Control myUserControl = (Control)Page.LoadControl("~/View/EditScheduleProgram.ascx");
How do I get the event of the dynamically loaded control?
I am trying to create a plugin system where plugins can be dynamicly loaded (we don't know how many there are, what their classes are called, ...)This is sample code for a plugin:
Code:
Public Interface IPlugin
Sub bla()
Function bla3() As String
End Interface
[code]....
This code SHOULD msgbox("yay") when it finds a type that implements my IPlugin interface. Yet it never finds one. I can't find what I did wrong. It gets to the debug.print("2"), but never gets past the "If GetType(IPlugin).IsAssignableFrom(t) Then".
I have the user control that is loaded dynamically. When the user save the data by clicking on the Save button, a raise event is passed.
Public Sub RaiseCloseEvent(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent Close(sender, e)
Debug.Print(String.Format("The control {{0}} was closed by {{1}}.", Me.Name, sender.ToString))
End Sub
In the save button I have called the RaiseCloseEvent as follows:
RaiseCloseEvent(sender, e)
Now, how can I close the user control form? Any Idea? I have used VB.Net language.
We loading and executing an assembly dynamically from code. While reading a dynamically loaded assembly how can we find an interface within the assembly which is marked (decorated) by another class like below
<ExternalDataExchange()> _
Public Interface IwfService
Event firstEvent As EventHandler(Of ExternalDataEventArgs)
End Interface
Here how can we find that we have interface "IwfService" which is marked with "ExternalDataExchange()" class.
I have a database that dynamically loads from Access into a datagridview. I have to enter data manually into one column in this datagridview. I need to be able to perform calculations to this data, for example I need to sum the data in this column, sqaure it and substract it from individual sqaures of the data in the cells. I should be able to sum it sum(22,33,44,53,67,23)^2-sum(22^2,33^2,...23^2). The number of columns keep changing depending on the database I choose to load, so I need to code this dynamically too. I am not really a VB person. I did the same in excel using Visual Basic and I am trying to do it in this Visual Basic environment.I built a tool in excel(VBA) that do some statistical calculations and data analysis and I am trying to build the same in Visual Basic.
View 10 RepliesI have a Main form that has a split container in it. In Panel1 there is a treeview control. Panel2 is initally blank when Main loads. Upon clicking on one of the nodes in the treeview a form will load in panel2 and adjust the location of the controls based on the size of panel2. The controls are all in a panel themselves so that I am only moving a single object.
Moving the controls when the form in panel2 initially loads works great. But if the size of the Main for changes then the only way to get the controls to reposition is to click on the treeview and reload the form in panel 2.Code for the tree.
Code:
Private Sub TreeView1_NodeMouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeNodeMouseClickEventArgs) Handles TreeView1.NodeMouseClick
Me.SplitContainer1.Panel2.Controls.Clear()
[code]....
I tried to with code in the panel2_resize bit i got an error as soon as I clicked on the treeview as i did not know which form was currently loaded. What would be a method to accomplish repositioning the controls in panel2 regardless of which form is loaded?
I'm trying to add a "panel" with controls dynamicaly. Something like the code below, Clicking "Add" button, displays a "Panel" with the controls(which are within a table), the number of "Education" someone can enter is unlimited. I know how to capture the data, but i can't figure out how to implement/code this,
[Code]....
I understand the page lifecycle and how i need to add the dynamic controls on page_init if I want to take advantage of viewstate. Also I know that I should try to avoid dynamic controls when possible. The dynamic controls are created depending on an object that is created from custom event arguments sent from a custom treeview. Problem is I need viewstate so I need to create them in page_init but I don't have the event args to create the object that tell me what controls to add until later in the lifecycle.
Private Function GetEventArgs() As npTreeViewEventArgs
Dim control As Control = Nothing
Dim e As npTreeViewEventArgs = Nothing
[code]....
I use this in page_init to create my object and controls.
I've successfully been able to add controls (labels, images, buttons, etc) to a panel control (using VB/ASP). This panel control, I refer to it as "insertpanel". Then I add this panel to the main panel on my webpage which I made during design time. The problem I run into is that when I add multiple controls of any type to the panel, they are all added in line with each other. I tried giving my image some css-styling of[code]....
View 1 RepliesI am looking for the best way to dynamically arrange the location of labels (or any control for that matter) during runtime in a Windows Forms application using VB.net or C# in VS2008.I have a control that displays messages created by users.This control has a panel docked at the top which holds the header information for each message, called pnlHeader There are 8 labels: 4 of them display static descriptions (e.g. "To", "From", "Created Date", "Completed Date")And the other 4 display the relevant data for those descriptions. (Passed in during runtime from a MS SQL 2005 DB).Static labels are named: lblCreatedDateLbl and dynamic ones: lblCreatedDate The application runs on monitors of various size and resolution, therefor I would like for all of the labels to arrange themselves with equal spacing in pnlHeader, based on the current width of the panel.
At first, I had simply created the labels in the Designer and used Anchors (half of the lables were set to (Top, Left) and the other half to (Top, Right)). This solution worked for most scenarios, but did not always provide a consistent solution, so I decided to add the controls in code instead.
I thought it would be easier to work with the labels by creating a panel for each corresponding pair. So pnlCreatedDate would hold lblCreatedDateLbl and lblCreatedDate I wrote 2 methods: 1 to define each label and add it to the relevant panel: Sub AddLabels
and another to determine the width of the panels and set the correct location: Sub SetLoc Currently, AddLabels runs in the constructor after InitializeComponent() and SetLoc is called after the data has been passed in from the database.
I've tried making minor changes and tweaks to the width and size parameters, enabling and disabling AutoSize, but nothing returns a consistent solution, instead either all the description labels are misplaced, or do not appear at all or completely whack locations come up.
Private Sub AddLabels()
'Label Created By:'
lblCreatedByLbl.Location = New Point(0, 0)
[code]....
I'm wondering, when I add dynamically controls in runtime in the form - is there a way to save this controls, and they appear the next time when you run the application?
I'm using VB9.
I'm developing a website in visual studio 2008 using (asp.net/vb)I have to allow registered users to build pages and add controls that are already defined by the same userMy problem is how to build this page dynamically?In other words, I'd like to make like any CMS (e.g. Joomla). CMSs allow us to make new pages and add our controls then save them..
View 1 RepliesI am working on a project for a handheld in Visual Studio 2008 where I need to add a group of labels to a panel that correspond to a record on the database. The record is a "Pass/Fail" Record. So, if the record is a "Fail", the failed items will be added below the main group of labels; therefore, many child groups of labels will be added below the main group, which is theoretically the header record. I am using a second panel to add the failed items. My issue is how to dynamically add, name, and position the failed item labels and panels. Below, I have included a sample of what I am trying to accomplish.
View 12 RepliesWhat I am trying to do is dynamically create a bunch of dropdown lists and then I want to loop through them and update the database with those values, but the problem I am facing is that I create the dropdown lists, but then when I go back to loop through them they are no longer in the panel. I don't know why but when I am debugging I have a count of 50 controls in pnlTeacherSelect right up until I press the button that calls prcChoose.
[Code]...
Using ASP.Net MVC1 and am dynamically creating the html in a model that is then dropped into the view and rendered at run time.
My view is a single page that looks like this:
<%@ Page Language="VB" Inherits="System.Web.Mvc.ViewPage" %>
<%=(ViewData("Content"))%>
This dynamically created content is mostly dropdownlist boxes in the format of
<form method=post action="/questions/nextBatch">
<div id="text">What is your preferred drink?</div>
<select>
[Code]....
Is it is possible to perform validation on the dropdowns lists to ensure that a value has been selected? If any of the dropdownlists that still have the default value (the "please make a selection" text) the page is then redisplayed with the font colour of the question or dropdownlist box changed to say red?
I'm from the Webforms world and have made the switch over to MVC (which I really like!) and I know there are some pretty slick validation tools out there but you seem to have to account for them within the view itself.
I cannot pass a HTML helper through the viewdata of the controller as it does not render unless it has been coded directly into the view itself.
Also, I'm looking for a pure asp.net solution as I cannot use javascript due to accessiblity concerns. I can access all the values of the dropdowns without any problems throug the formscollection object but from there I'm a bit stuck.
like this i have n number of questions in my word document. so my need is i need to read the questions and fill it up in the datagridview with yes or know chek box. my datagridview appearance would be as follows. so the peson who is viewing the questions and can make yes or know option using the check box.if the person chooses no option he has to enter the reason the reason column. so i have to do this dynamically. means that binding datagridview with checkbox ,textbox, data dynamically. how to do this please because after the datas entered in the datagridview i have to loop through rows and i have populate into another word document. so please if there is any sample
View 4 RepliesI have added Following HTML in the Form:
<asp:Table runat="server" ID="tblFlightDetails">
<asp:TableRow>
<asp:TableCell CssClass="ASPTableHeader">
<dx:ASPxLabel runat="server" ID="lblFrom" Text="From" CssClass="LabelFont"></dx:ASPxLabel>
</asp:TableCell>
[Code]...
Now from Serverside code I have added 3 rows dynamically.. when ever page gets Postback.. all dynamically added rows get disappear.How can i get the dynamically added rows after postback??
How would I dynamically enable/disable group boxes based on a radio button selection? I am trying to do it with two group boxes. The group boxes are called grpSelectChars and grpPWAutomatic. The radio buttons are called rdoChooseChars and rdoRandomlyGen. if rdoChooseChars is selected then I want grpSelectChars Enabled and grpPWAutomatic Disabled. in the load sub I have rdoChooseChars Checked
Private Sub PWGenerator_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
rdoChooseChars.Checked = True
If rdoChooseChars.Checked Then
[code]....
I have been set a project from school to design snake in VB.Net but i am struggling to dynamically add the user control which acts as one of the dots in the body of the snake. Every time i add a dot on to the snake the previous vanishes. I assume this is due to me overwriting the previous one by creating a new instance of the object but i cannot find a way of adding a new one in.[code]I have tried using body(i) and other ways of adding a new instance of the object but am stuck.The subroutine will be called up when a new control is needed.
View 1 RepliesI am dynamically displaying some controls in a TableLayoutPanel. The problem I'm faced with is that I want the controls to be displayed in a specific order, instead of just filling the TableLayoutPanel from 0,0 till the end of the panel.
I have 5 columns and 5 rows.
1st row is for buttons only, 2nd row for combobox, 3rd row for radio button.
I want it to be displayed like this:
Button1 Button2 Button3
Combobox1 Combobox2
RadioButton1 RadioButton2 RadioButton3 RadioButton4 RadioButton5
[Code]....
I have 4 textbox on my formviz. txtQuantity0, txtRate0, txtDiscount0, txtAmount0When User Press Enter Key on txtAmount0 a new row of textbox is created as follows
txtQuantity1, txtRate1, txtDiscount1, txtAmount1
I have a code that dynamically generates some pictureBox-es. What I want to do is to save them so that they will aslo appear the next time the application is opened. Also i don't want to use an external configuration file so that the controls are generated on file-read.
Also I also have some controls that are generated by the designer
In my application I'm dynamically generating multiple rows of dropdowns and populating it with the field names based on the selected table value. Based on the field name selected I want to display a tool tip containing the selected field data. how I can use the tool tip for dynamically generated columns.
View 2 RepliesI am trying to create an app that adds tabpages into a tabcontrol which has a several controls on each tabpages. However how do I access those controls?lets say the controls I add are named label1 and label2. the tabpage is named infoTab1.
If I do inftoTab.infoTab1.label1.Text = "some text" I get an error saying infoTab is not a member of 'system.windows.forms.tabcontrols' cause in design time it isn't added yet.So how is this actually done? am I on the right track?Any tutorials are more then welcome, tried google but only get basic concept stuff comes out it or trying the wrong keywords.
I'm having trouble trying to access a list of comboboxes created dynamically in one procedure from another. I believe I have to add in an event handler but I not sure how this is going to work. Or should I change the array scope?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'variables declared here.
[code].....
