I'm new to vb but acquainted with programming in java, C, and other languages. I'm developing an application and I'm having difficulties at commanding controls from different forms. It's like this: Form1 has some buttons and charts, and in Form2 it's a "Settings" form to select the category and series for the charts. When i close the Form2 I need to activate some controls like buttons in Form1 and the problem is that at run-time I can call functions like this one:
In Form1:
Public Sub EnableButton()
button1.Enabled = True
End Sub
In Form2:
Public Sub BeforeClosing()
Form1.EnableButton()
Me.close()
End Sub
Using breaks I can see that they execute and the properties of the button change but after the close event of Form2, the properties of the button1 control become unchanged. At the global variables I have:
Dim newChart As System.Windows.Forms.DataVisualization.Charting.Chart
At ButtonX_Click i create a new chart and define some properties and in the end i activate the Form2
Private Sub ButtonSettings_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonSettings.Click
[Code] .....
So the sequence is:
Form1 Execute: Button_Settings_Click -> initialize chart and Form2.Show()
Happens: Chart Initialized and properties are changed Form2
Execute: Button_OK_Click -> Form1.Button_ShowChart.PerformClick() and Me.Close()
Happens: Sub .PerformClick() executes but values are not changed Form1
Execute: Button_ShowChart_Click -> Add data to Chart
Happens: Chart is found as NULL and properties are lost
Why does the controls properties are lost if they are executed???
I have a query about dynamically added controls to a form. I have a series of buttons which are created and added at run time. I have a two drop down lists and two buttons which are created at design time. Button 1 creates a series of buttons called "Test 1.x" based upon the selection of the two drop down lists. This works fine and am happy with the logic.However.... Button two should remove all the dynamically created buttons from the form.This does not happen. What does happen is that 50% of the buttons are removed starting with the first one. WHen checking the loop it only enters the loop half the amount of times that there are buttons. Very strange. When the loop is run repeatability it will remove all controls. Why will my logic not remove all the dynamically created controls at once? What is wrong with my logic?
I attach two code snippets and the .net file for your consideration.Button method which creates the dynamically created buttons from the two drop down lists and adds to form
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim Count As Integer Dim MaxHours As Integer
I was playing a game recently and saw that they could use args in the shortcut, and I decided to try to impliment this into my application...so far, I got: (runs this sub on load)
Sub startup_args() If Environment.GetCommandLineArgs.Contains("+game") Then Dim path As Array = Environment.GetCommandLineArgs
[code]....
just to see what it returns, but the application crashes. I also tried path.tostring(), but that didn't work. When I did:
If Evnironment.GetCommandLineArgs.Contains("+game") Then Dim path as string = Environment.GetCommandLineArgs.tostring MsgBox(path)
I have more than 100 controls (labels, textboxes, menu, Gridviews etc).I want onclick a button to turn all these controls to visible = true Now I need to code them one by one. Is there a code (in VB if possible) to make it applies to all in the control ?
When I click the "Edit" button, and it switches to the EditItemTemplate view on the right, I want to prefill the Textbox and select the corresponding option in the DropDownList. [code]...
I would like to know how do .net developers manage a large window application with a large number of controls, such as textbox , button, groupbox? I have seen a number of people do it this way : declare the controls as an array and initialize them one by one at run time . In this way it is easy to manage those controls because they can be accessed by array index; but this solution seems to require very good understanding of control's attribute such as its location, font etc. This could be a difficult task if the project is passed on to a less experienced developer and add changes to it.How do you deal with it?
I am developping a VB.net application. I would like to add buttons on the MDI but every time I open a child form of the MDI, it appears down the buttons. Is there any way I can solve this problem?
I have a forms app that contains a few forms. My task is to make it run invisibly when called from the command line with arguments.I have defined a Sub Main in a module and made it the startup item. I have an if/then/else that looks at args.length and if it equals 0 then I load the form and run the app normally. But how do I handle things when args are passed? I still need access to all the functions defined in my main form. Can I load the form invisibly and still "use" it?
I am trying to start CMD and pass a command to it and then monitor it in the app I am writing. The user enters the information that makes the commandline and when they click Go it does start CMD but straight away it says it can't find the file.Is there any way I can view what is being sent to the CMD prompt to double check that this is correct? Do I need to specify the path to the file I want it to run, i.e. cscript c: estMigrate.wsf?
I am working on an application and I want the user to be able to enter commands into a textbox, and when they press enter, the command is printed in a rich text box, executed, and the output is printed. For instance: the user types move{file1}, {location} into the text box and this happens:
>command: move{file1}, {location} >$ moving file1 to location >job completed
How would I write lines to the rtb and execute commands when the enter key is pressed?
This works, partly. Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles command.KeyPress If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then RichTextBox2.Text = Environment.NewLine + command.Text End If End Sub
it erases everything in the textbox before adding the line... I would also like to be able to make a database of commands, maybe a .dll or something, so that when the user types in something, it checks that database to see if the command exists, if it does it executes, if not, error.
I am working in VB. I have a fairly long and detailed explanation that I'll avoid posting but what I'm looking to find is quite simple. I'm looking for information how the command line executable LAME.EXE (the Mp3 encoder) returns information to the host program/form.
I am a VB novice and a novice to programming in general and am looking to learn more about as much as I can on the whole but basically I have a Windows form that gathers all the necessary information as a front-end:
The input .wav file path The output .mp3 file destination
The encode settings (bitrate, frequency, etc)This information is pooled in to a string like this: lame.exe -v -b 112 input.wav output.mp3 or any variant on the settings selected in the GUI which is then in turn used to execute LAME.EXE with the set of parameters in a command line console...That's all well and good and it is quite functional but what I'm looking to do is to 'hide' the console in itself and have the encoder feed back its progress, say as a percentage inside the GUI.
The problem is that it doesn't appear that LAME in itself has this kind of functionality explicitly built in. I know it's possible however, as every single front end in the world has this functionality.I have tried a few ways of doing this with avoiding the issue of not being able to find the functionality within the codec. Perhaps I'm looking in the wrong place entirely or I'm not thinking correctly 'outside the box' as it were.
what I'm looking for is to use a command like this within the script itself: lame(v,b,112,"C:input.wav","c:output.mp3") or even pass the parameters obtained from the GUI a string formatted dynamically on the fly itself.I expect of course that this kind of functionality won't be available anywhere at all, what I'm really looking for as a workaround that reports the actions/progress/console output of the executable back in to the VB program somehow.
I am writing an application in which a user is doing a file conversion. I have a set of tools that can perform the conversion on the fly via command line, but I'm not entirely sure of how to go about passing the parameters I need to the command line and running them. Can someone point me to the right direction?Would I just create a System.Diagnostics.Process and use that? If so how do I do the line by line command? For instance if I need to issue a cd command to change the directory and then execute a command after that how would I do that?
I have a command button that when presed allows the user to rename a label on a control ( form ) b4 its loaded.i want to put a command in the forms load event to take out any spaces b4 text in label1.
For some reason now, when I start a new project in Visual Basic 2008, I can no longer add any new controls to the forms. All controls are grayed out in the toolbox. What can I check to see what's causing this?
I am trying to write a program using Visual Basic 2008 Express Edition that will automaticlay generate multiple Command Buttons that have different Texts and perform different commands.For example I want to generate Button_1 and Button_2 where Button_1 when clicked enters the value "1" into a textbox and Button_2 enters the value "2" into the same textbox.I know this can be simple done by using the designer and wirting the code in the Button_1_Click, but what I want to eventually achieve is for various buttons to be generated across different Tabs in a TabControl.So far I can create a button on a windows form using code, but the button has no purpose so command is assigned to it. The code i've used is listed below:
I have a 8 bit Gif, that is transparent, with controls sitting on top of it, all in a custom control. This part works fine. However, This control is a menu ring (appears around another control with a few options). The transparent part is over a Picbox, that is in a panel. The transparent part of the image seems to skip the picbox and go right through to the panel. I set the panel to a back color of RED. The custom control when its placed instead of showing the image in the pic box that it is on top of, it shows the RED panel I have made sure all my Z orders are right.
I'm creating a reporting application, and our customers are going to need to generate some pretty big reports which require quite a bit of memory. Ive been in a re-factoring mood lately, so I was wondering what the best way to access the properties of another open form would be(The reporting viewer opens in a new form.) So far I have:
Dim form As MainSelections form = My.Application.OpenForms(2) yay or nay.
*Edit - I should probably mention that what I need is a label, two date time pickers, 5 datagridviews and a few datasets. Those cotrols have the info I use for my parameters
I have a thread running on a child form, I want to activate a control on the parent form but cannot. It works fine if It's done from the child forms UI thread:
Public Class FormRestoreDB Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim t = New Thread(AddressOf UpdateListView1)
If I load a datatable, and then set a listbox properties pointing to it, I get the right data, e.g.:
[code]...
I get System.Data.DataRowView instead of my actual data.I don't understand how the databinding is actual happening, and how I refresh my the data in the control when the data changes.
we all know how to dock or anchor controls so that they resize themselves accordingly when a form is resized. It works fine till we have rows of controls on left and right size of the form. But what if have three columns (Columns as in visual sense. I'm not talking about any column control containing other controls) of controls? For example a form having a bunch of controls in the left side, a bunch in the middle and a bunch in the right. There may be a few more bunches in the middle. Now while resizing the form, I want the controls to resize accordingly as well as change their positions to make space for the previous bunch of controls that are resizing.
I mean, while the user increases the form size horizontally, the controls of the second bunch should resize and at the same time they should move right because the controls of the first bunch are increasing horizontally too. When the user decreases the form size horizontally the same thing should occur in the reverse order. I can manage it somehow using nested split-containers but that's too cumbersome. I would like to know if there's some better way to achieve it, like setting some property etc.?
I have a simple UI form with some controls (textboxes, checkboxes, datagridviews etc.) The form communicates with an object that contains the values that should be displayed in the controls.
I am trying to group various controls (of the same type, e.g., labels together, buttons together, etc.) on a form using a tag or a name of some sort so I can identify all those that belong to tag 'A' and those in tag 'B'. In the end I will have on a form a number of labels grouped as tag 'A' and some labels as tag 'B' so I can change their visible properties on/off.
im am working on a form with a few textboxes and buttons, the problem is when the form is resized or maximized the controls stay small. If someone could please show me how to resize the controls as the form is being resized.
is there any way that i can set the property of a control all at once? like for every button, i want their backcolor to be red. something like that.also is it advisable to set the properties of a control in design view rather than code it? does it have any performance issues?
I tried rewriting one of my old VB6 projects today. I keep getting stuck. I know that default instancing from VB6 is pretty much gone in VB.net. I have several forms and modules. One form is nothing but a form with a progress bar. When there is certain workload that particular form shows up and displays activity (via progress bar) and then is closes until there is more relevant workload in the app. In VB6, with several of my sub-routines (in my modules) I was able to control the progress bar value by simply referencing it this way: WorkForm.ProgressBar1.Value = (value goes here). This does not work in VB.net since WorkForm itself and any controls on it are considered private. I have tried creating instances of the "WorkForm" via "Dim wForm as New WorkForm", but even then "wForm.ProgressBar1.Value" does not work and I keep getting "'wForm.progressBar1' is not accessible in this context because it is 'Private'."
In fact when I try accessing any control on any form from my various sub-routines all I get is: "is not accessible in this context because it is 'Private'"By the way, is it just me, but after a few days working with .NET framework I realized that it seems pretty web-centric. It seems the whole idea of .NET is to push the apps from the desktop onto the web. I mean, if I rewrote my app to use only a single form up front, I wouldn't be having these problems. But then again, it wouldn't be a desktop app, it would be an app that could be easily embedded into a webpage. Is this the general idea? I am definitely not rewriting my app so it uses only one form. This is a desktop app and multiple forms are necessary.
