I have a main form and a sub-form which is opened in modal way (by subForm.ShowDialog())The sub-form has a msgbox function inside. after this msgbox is displayed to screen, the application closes the sub-form for unknown reason (and goes back to main form).If I use "subform.show" instead of "subForm.showdialog" - everything works fine.
View 8 RepliesI knew VB.net is very weird when talking about shadows and overloads, but this this I'm completely baffled.I'm working with a model similar to the following one. Parent class:
Public Class Base
Function F() As String
Return "F() in Base Class"
End Function
[code]....
im running this code to load a form and call a public method inside it:
vb
[b] newForm.Show()[/b]
Call newForm.editToolStripButton_Click(sender, e)
but when i use form SHOWDIALOG method it doesnt execute
Call newForm.editToolStripButton_Click(sender, e)
I have project that communicates with an embedded device via Telnet and displays the data string in a RichTextbox. Here is the (weird) problem: every time I send a command, the device responds, at the end of the response there is a prompt on a NEW LINE. However, when I ASCII encode the bytes received and display the string, the prompt is on the same line as the response in the text box. So I looked at the bytes for several different commands and the response always starts with a 13,10,13 which is CR, LF, CR, that puts the response on a new line, also displayed on a new line in the text box.
However, at the end of the response, there is always a 13,13,10 (CR,CR,LF) followed by the prompt, but in the text box the prompt is NOT on a new line it is merely a couple of spaces after the response. The funny thing is that this behavior is absolutely not present in Hyper Terminal, or Tera Term applications, when I connect to the device using Tera Term, the prompt is always on a new line. Even the VS IDE shows this correctly in the Output window, every prompt is on a new line. I can not for the life of me figure out why this behaves differently in my RichTextbox. I have experimented with different settings for the textbox, but so far nothing worked.
I've come across a situation where I try to run a simple line of code in a method Dim res As DialogResult = frmOptions.ShowDialog()but nothing happens. The dialog box will not appear. If I run this method from another location in the code it executes fine (i.e. displays the form in dialog mode and code executes fine thereafter). Hence, it may be the way in which I arrive at this code that is causing my problem, but I cannot see to find what is wrong.
When I pause the debugger the line of code is highlighted in green but I can't see to step over it or into it what may cause this to happen, or what I should be looking for that might be causing the problem??
Dim res As DialogResult = frmOptions.ShowDialog()but nothing happens. The dialog box will not appear. If I run this method from another location in the code it executes fine (i.e. displays the form in dialog mode and code executes fine thereafter). Hence, it may be the way in which I arrive at this code that is causing my problem, but I cannot see to find what is wrong.
View 8 RepliesI have a task to provide a RichTextBox control that behaves like a tooltip, ie:
1. Hovering when mouse moves
2. Remove after N seconds (customizable) or if the user closes it (by "X" button)
The regular tooltip does not provide a RichText capabilities (else I'd take it)
Should I take a form and put a RichText inside, and set the form properties accordingly? Something else?
I am creating a custom Label control (by simply Inheriting the standard Label control and re-painting the background and text) because I need a very specific background and border. In the constructor of the control, I set the AutoSize property to false so I can have a standard default size for the new label.
Public Sub New()
/*Set the default size of the control to 75x24*/
Me.Height = 24
[code]....
In my application that uses this control, if I create the new custom label at run time (in code), the AutoSize property stays False, and it works properly.If I try to add the new custom label to my form at design time, it comes in with the AutoSize property set to True, and I have to manually set it to False in the properties window. It's not a huge problem, but I don't understand why the behavior is different.
How can I call this function to show the current date in CurrentDate.Text textbox?
Public Shared Function getCurrentDateTimeString() As String
return DateTime.Now.ToString("yyyyMMddHHmmssff)"
One of the problems with datediff function is that even if the two dates are 31-12-2011 and 01-01-2012,it will show the difference as 1 year.How to overcome this problem?
View 17 RepliesSuppose I have a function that accepts a string as parameter. But the parameter has a limited number of values (i.e. I've defined the function to work with only say, four exact strings). What I want is that when the user types the name of the function and starts the parentheses, the intellisense will show up giving the values that are defined in the function. Its just like a function that accepts a boolean parameter. The intellisense shows up giving the two values "True" and "False" when using the function.
View 2 RepliesI've inherited a lot of custom made software for an office, and, while managing it, I've found it performs differently from machine to machine.I mean, some controls get painted in weird ways in some machines but well in another, or just work differently, like in some machines clicking something selects it, and in the next machine clicking the same thing makes it editable.I suspect, o course, of the myriad of DLL the software loads
View 2 Repliescan some one help me show the code how to pass textbox value and then search it at datagridview.when i write "abc" in text box then datagridview wil show only a record that contain "abc" word.and can it be outomatically show at datagridview.i mean when i just type a at the text box then datagridview will show a record that contain a, and when i add b in text box = ab then datagrid will show record that contain ab word..
View 1 RepliesHi. what is the difference of sleep function and pause function (using timer) between a loop.
View 12 RepliesWhat will happen when 3 function calls same function at a time? I have 3 Function, f1,f2,f3.. Those function after completing their task will call finish() function. What will happen if Finish is Called morethan once..
View 9 RepliesI'm having issues with program that uses radio buttons to select between 2 different forms, that are displayed using showDialog. When I click a button to perform calculations in either form, it will act normally and display the information, however when I click the Clear button to begin a new calculation, the form will close, does anyone know why?
View 1 RepliesI have a form that I am using to search for records in a dataset, it has a text box for entry of the search criteria and a 'Search' button to initiate the editing of the entry and .Filter on the BindingSource. This is one form in a project with many, when I show it using .ShowDialog it always disappears, (not visible and not loaded) after the 'Search' button is clicked, I have stepped through and there is no .Hide or .Close that it encounters, it performs all of the logic correctly but control is returned to the main form it was shown from. When I use the .Show method, I do not have this problem.
View 5 Replieswhere I am starting another thread which opens a form. Succinctly, it is an animated "Please wait.. processing" type of form. The issue is that I want to make this form a child form of the parent (main thread or main GUI) when I open it.The issue is that I prefer to use frmProcessing.ShowDialog(frmMain) instead of just frmProcessing.Show, because of form disappearing issues. It, of course, gives me an error of illegal cross thread operation. My question is, how do I perform frmProcessing.ShowDialog(frmMain) to show from within another thread, that the newly opened form is actually a child of the main thread. Is there a better way for me to make a small processing form telling the user to be patient while background processes are working? [code]
View 2 RepliesWhen I run this code, it does not seem to open the OpenFileDiaplog diaplg box, or if it does, it closes it immediately, and I get at index out of bounds exception at the " infileStream = getFile.OpenFile()"This exact same code works without problem in another application I am building. So maybe its something about the IDE environment?I think, but am not certain, that this code worked in 2003 .net. I then used the VS wizard to automatically convert to the 2005 environment that I am now coding in.
Dim infileStream As Stream
Dim getFile As New OpenFileDialog
getFile.Filter = "All files (*.*)|*.*"
[Code]....
I converted this app from VB6. I have 2 forms. Form1 instantiates Form2 via a Menu Item.I am having trouble getting Form2 to end when clicking close (X). If Form2 is 'idle' it closes fine; but if I am in a loop processing anything all the events fire, but it continues processing in Form2. I've tried messing with Dispose, Close, Application.Exit, Application.ExitThread. My last attempt was creating my own event to fire back to Form1 and dispose Form2 -- and it hits it but Form2 is still running. What is the deal? BTW if I use just Show vs ShowDialog -- Form2 just blinks and disappears.[code]
View 2 RepliesI converted this app from VB6. I have 2 forms. Form1 instantiates Form2 via a Menu Item.I am having trouble getting Form2 to end when clicking close (X). If Form2 is 'idle' it closes fine; but if I am in a loop processing anything all the events fire, but it continues processing in Form2. I've tried messing with Dispose, Close, Application.Exit,pplication.ExitThread. My last attempt was creating my own event to fire back to Form1 and dispose Form2 -- and it hits it but Form2 is still running. What is the deal? BTW if I use just Show vs ShowDialog -- Form2 just blinks and disappears.
Form1 does this
Dim f2 as Import
:
[code].....
I have a form that uses another class to do some work, and the class throws events regarding text updates, and the main form handles them and passes them on the the StatusForm, which displays the process progress via usercontrol. Using a BackgroundWorker and Events I'm able to update the usercontrol on the Status form if I use frmStatus.Show(). Unfortunately, the Status form should use ShowDialog() so it can't lose focus while the application is processing data. Now, for some reason the UserControl will not update if I use ShowDialog(). Any ideas?
View 7 RepliesI wanna overload the ShowDilog for my form. I wanted to clarify whether the Owner should be passed as Value or Reference.
View 2 Replies[code] For some reason, and I don't know why. The same CustomSplashScreen that had a handle for UpdateText shows to not have a handle when I call .Close().So basically it would show the splashscreen and update the text, but the form would be left opened and not closed like it is supposed to be.
View 2 RepliesIn my program I use WebBrowser control for OAuth. It's located on vk_auth_window form. So in the code I call vk_auth_window.WebBrowser1.Navigate(vkauthurl). If authentication is successful, I silently get token, but if user is not authenticated a form vk_auth_window is showed to them to enter username and password. To check this I catch _DocumentComplete event and check for the right URL. I need no other code being executed until the user finished authentication or closed authentication form. ShowDialog() does the trick, but it somehow hides cursor from username and password fields in WebBrowser control. So I introduced a variable Dim showform as Boolean=True in and set it to False from the _DocumenComplete event and in the main code I use infinite loop.
While showform
System.Threading.Thread.Sleep(100)
Application.DoEvents()
End While
However it makes userinput slow due to thread sleeps. And If i remove them, it loads CPU quite a lot. Is there a better way to wait for form to close? What is it?
I have a new developer that is calling Showdialog (in VB.NET) on a Windows Forms form without first creating an instance of the form.How is this possible? I don't see a shared method for ShowDialog...
I'm not crazy about this approach either as it seems to me that the dialog will not be disposed until the application exits.What am I missing? Is this a new best practice?OK, Form2 is just a blank form.Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button1.Click
Form2.ShowDialog()
End Sub
End Class
So you know how when you call "Form.ShowDialog" from where ever you call it, it blocks until the form being displayed closes. And then the function returns whatever result it was.I want to know how to block like, but without a form, yet still have the "main ui thread".Basically I have this long process that needs to thread out and do several things... and it's heavily event based. It jumps between two threads, the main ui thread, and it's own background thread. The main ui thread needs to have access so that I can randomly open different dialog boxes for things... sometimes they're just windows asking to hit OK or Cancel to continue, others it's to perform some action, etc etc.
But there is NO central form related to it. It's a complete background thread running that randomly hops over to the main ui thread for things.Right now I have this class I designed called lets say "DoJobProcessor". On it is a function called "BeginDoJob" that threads off from the thread pool... when ever I need to jump back I use a ManualResetEvent to block on the background thread, jump over to to the main thread with "invoke" and passing a reference to the MRE, then release the block when done there and continue on on this background thread.
All while this is going on I just set the form I'm trying to block the main ui thread from managing by just setting its Enabled property false.It all feels just messy and annoying... and I was just writing something using ShowDialog and I was like... HEY, what if I could block this BeginDoJob method, hi-jack the main ui thread, then let that function return the result when done instead of having this "Complete" event with the return value in it. It's obviously possible because ShowDialog does it, but I don't know how.
This way the job I'm performing isn't always waiting for the main ui thread, instead its the other way around... the ui thread waiting for it, the way it aught to be. Show something, branch off do some stuff and just idle the display while it does it, come back show something else, branch off and just idle while it does that.
I have a form that is called w/ ShowDialog. Inside that form, I want to pop a message box to ask the user a question, but it doesn't show.[code]
View 2 RepliesWhen i close one window and open another using showdialog it shows back window or desktop for a while and then open the required one. I want to open directly without showing back window
View 1 RepliesI am teaching myself VB.Net at the moment but seem to be doing something wrong with ShowDialog. It pops up twice when I run the program. I do not get a compile error. [Code]
View 10 Replies