VS 2005 - How To Remove Graphical Object
Apr 7, 2010
I am writing a app and I have a treeview. This treeview gets populated with parent and children. I also have a panel and a picturebox with a image in the picturebox. On top of the picturebox I and writing some Graphical objects.
See code
Dim theG As Graphics = Graphics.FromImage(PictureBox1.Image)
Dim ComputerName As String = ""
Dim UserName As String = ""
Dim NodeIP As String = ""
[Code] .....
When Afterselect on the treeview item this code runs. However when I select another child/node the code runs again whcih is great it write over the top on the previous text. What is the command or how do I clear/delete/remove the theG.drawStrings from the first AfterSelect from the treeview so the new drwstrings are clear.
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Mar 6, 2010
How do I access SqlCommand object graphically. I couldn't find SqlCommand tool in the ToolBox under Data group to drag it into my form
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Feb 11, 2011
I am able to populate an object and output everything. How do I remove say the name2 object?
la.Remove(Logins("name2")) doesn't seem to work.
Private Sub btnListArray_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnListArray.Click
[code]....
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Sep 4, 2010
i have this code in asp.net 2005 page under vb codes on myreader.Read gives me "variable myreader is used before it has been assigned a value a null reference exception" and in the ex msg " object reference not set to an instance of an object".
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Dec 24, 2009
how do we implement Finalize to remove an object?i tried this:
Public Sub kill()
Me.Finalize()
End Sub
then this:
Dim g = New Test
g.kill()
MsgBox(g.ToString)
weird the object still exists, i don't get a NullReferencePointer exception
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Aug 12, 2010
Good example using the List(T) object. I need to be able to add and remove items from it.
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Nov 3, 2009
i trying to do login form, if user & password correct, then will show Main Form. First time login is no problem at all, after closed the Main Form, it will back to login form. Problem come when i try to relogin again & show "Object Reference not set to an instance of an object" when try to access the database. Attach my code here:
frmLogin -
AppPath = Environment.CurrentDirectory
DBFilename = AppPath & "DatabaseBT2 Test Results.btd"
frmMain.txtDBFilename.Text = DBFilename
[Code]....
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May 12, 2009
For some reason, on the line where I try to set the value of the key, I get the following error:
Object reference not set to an instance of an object
vb Private Sub writeToKey(ByVal regValue As String)
Dim regkey As RegistryKey = Registry.CurrentUser.OpenSubKey("SoftwareMicrosoftWindows NTCurrentVersionWindowsDevice")
regkey.SetValue("Device", regValue, RegistryValueKind.String) 'error occurs here
regkey.Close()
End Sub
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Sep 14, 2011
Is there a simple way to remove Objects from a List by using a specified value?I add 2 persons to a List, how can now I remove a person by a name without using any Loops? (if possible)
[Code]...
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Jul 6, 2010
I've been searching and trying out code all day.Nothing errors on this code but it doesn't delete any user accounts.[code]...
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Aug 15, 2009
I am totally new to the graphical representation of the data. I want to make a progress report of students, based on marks achieved each year.For example, in year 2005 marks were 750. in 2006 780 in 2007 800
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Jul 24, 2010
want to make my program look nicer , but i dont exactly know how should i make it's visual for example making a menu or else
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Aug 2, 2011
I have a file from the client which is a text file. I have to decode the file to a graphical representation. Is there any way I can do it?
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Dec 30, 2009
I want program to do Graphical Representation of array Sorting in vb.net with bars/shapes.
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Oct 8, 2010
What is the best way to write a GUI for C++?
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Sep 17, 2011
i want the user interface to be kinda similar to the jQuery UI. This means themed buttons and windows(preferabely the ones form jQuery UI) Also, i'm looking for nice sliding and morphing windows.
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Nov 25, 2009
I need some guidance on the codes on how to :
1) convert voltage level into graphical display,and
2) Voltage indication with moving needle .
[ Info : I've already input the codes to display the voltage in numeric, but not in graphical display ] =)
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Apr 20, 2009
I am working on this hangman project that has a graphical interface where the user has 2 options either guess the entire phrase or use a combo box to guess letters. I have the guess text box working but I can't for the life of me figure out why it is not working correctly with the combo box. The following is my entire code for the project. I have it setup to show me which phrase it randomly selected but when ever I pick a letter in that phrase it doesn't fill it in or anything. I'm thinking it is an issue with my loops.
I highlighted the section where the problem is occurring.
Public Class frmHang
Dim strWord(10) As String 'array of answer cchoices
Dim strAnswer As String 'the correct answer
[CODE]...
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Jun 22, 2010
I have used flash(.swf) animation & high quality graphical image there in my vb.net application. But problem is that sometimes when I click on menu it shows small line under it & take time to load it. It shows line under menu when load another forms though there is no line under that menu. I have 25 forms & every form has high quality image(image size is 1280*1024). Is there any way to get rid of this problem? Is there any way to make my application smooth though its high graphical & animated?
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Aug 20, 2009
My form has FOUR comboboxes populated from text files. The text files are loaded into an array into their own background process once completed are added to the combox. Due to the sheer amount of items the loading causes a lag and as the combobox are on the main GUI thread a glitch appear for several seconds. I then had an idea of loading the initial form, showing another form which is made the topmost form with a progress bar (values derived from the count of items in the arrays populated from the text files).
When I added the progress bar any other label or image on the SAME form did not show until the progress bar had completed, how can I resolve this? When I use it in conjunction with the other form i.e. using the form with the progress bar to populate the other in the background graphical glitches appear (mad transparency effect). I have the code from the form with the progress bar below:-
'Load City information
'*********************
'Set form title
Me.Text = " Application loading city lookup information ...."
'Declare string array to store list of towns
Dim citylookup() As String
[Code] .....
Why I experience the glitch (assume it's because of refreshing the item, some kind of repaint needed)? Any alternative solution to prevent the user from using the form until all the comboboxes are populated?
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Apr 17, 2012
I've been working on a graphical simulator application using GDI. GDI is terrible for rendering what simple graphics I need, too much flickering and definitely not efficient. From what I have been reading GDI and GDI+ are pretty much out of date and what I should be using is Direct2D. But my problem starts when I cannot find ANY reference material to even begin coding. I found some examples for C++, but my little knowledge of C++ prevents me from implementing and translating it to VB2010. I have found someone on VBForums through a Google search that says he is starting a tutorial for Direct2D for VB2010 but I have yet to see anything happen.
All I am rendering are small circular shapes used for simulating cell growth, I have no problem rendering 10-20 moving shapes at a time with a small amount bearable flickering, but any more the lag worsens exponentially and the application will use a ridiculous amount cpu. Overall I want to be able to display and render over 100 shapes at a time. So my question is... Where can I find some reference material regarding Direct3D for VB2010?
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Aug 20, 2011
In this programe i use 1 button( i name it btnremove) and 1 textbox(i named it textbox name), both item i create in windows application .The function of this button is use to remove data in database and function of textbox is for user fill name . The probleam is if i click the btnremove , the data is still in the table( not deleted).I have create database name login and table name staff.In my table staff i create 7 field such id, Name, tel nu, address, username, password, department. Any advice how i able to correct my code to solve this issue. Here is my code.I am using visual studio 2005 & sql 2005 as database
Private Sub BTNREMOVE_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BTNREMOVE.Click
Me.Validate()
Me.StaffTableAdapter.Delete(Me.NAMEText.Text, Me.TELEPHONETextBox.Text)
[code]....
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Oct 2, 2011
I added a groupbox around some controls and now want to redo my design When i try to delete the groupbox VB wants to delete all the controls within it
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Oct 12, 2011
I would like to overrides the datetimepicker object to remove the texte when the property _clearOnDisabled is true. When _readOnly property is true, I would like to show the text in black not gray. So I tried with WndProc but I seem that every single object go through my function not only my datetimepicker. I get 100% CPU when I put the WM_PAINT message. I also tried to overrides the OnPaint but its not getting in.
Imports System.Drawing
Imports System.Windows.Forms
Imports DTP.WindowsMessages
[code]...
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Mar 14, 2010
I am attempting to figure out why this code is not working in VB2005.I am trying to run a check on a set of 25 buttons in a 5 by 5 square. they are label "cmd" & X & "x" & Y whereas X and Y are the x,y coordinates.cmd1x1 through cmd5x5 I am trying for this code to set varMapBefore() to either 0(for D) or 1 (for L) for each of the buttons cmd1x1 through cmd5x5 and then join them together at the end for an output.but varMap wont act like an object. What am I doing wrong?
Private Sub cmdStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdStart.Click
Dim varMap(0 To 24) As Object, varMapBefore(0 To 24) As String, varMapAfter(0 To 24) As String, varCheck As String
Dim varCount As Integer, varX As Integer, varY As Integer
varCount = 0
[code]....
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Aug 20, 2010
I have a legacy application that has an interactive graphical user interface, but also periodically checks for files in a directory and reacts to the files. I want to launch the application from a VB program, but not see the GUI (i.e., just let the file interface do it's thing). I really don't want to see the application running on the desktop at all (e.g., no windows, nothing on taskbar), the only evidence would be if I checked task manager I'd see it running.
Obviously this app would be ideally a service, but that's not where we are and I can't change it so I'm trying to simply not see the GUI.
I've seen the ProcessStartInfo.CreateNoWindow and WindowStyle = hidden flags but they don't hide the GUI of the legacy app.
again launch the legacy app (actually an unmanaged C++/MFC app) from a VB managed admin app.
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Jun 30, 2011
I have created a VB.NET program using windows forms. The program runs on a remote PC and displays information on a screen. The computer does not even have a mouse or keyboard connected to it. The program shows the information based on the file that is loaded.I want to be able to change this file remotely to another file that is already on the remote PC. I can't use a graphical remote desktop client as we have very limited bandwidth.So, my idea is to change the file using the command prompt.I'm not sure how to do this. Should I use something like this and load DosModule first:[code]How would I then read commands that is send to the program? I also only want one instance of the program running.
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Feb 15, 2012
I'm trying to hone up on my (beginner) coding skills & I would prefer that the the 'Designer coding window', not the 'Design window', wouldn't interfere with these studies. Sometimes it's there & sometimes it's not. I don't understand it at this point & would prefer it wasn't there. All I need is the 'Design window' & the 'regular coding window'.
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Sep 15, 2010
while writing some value to registry i am getting error as Object reference not set to an instance of an object. my code is like this
[Code]...
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Jun 8, 2012
I am currently working on my program to click on the listview items. I'm using listview mouseclick event to click on each listview item, I would like to know how I can get the messagebox to display to let me know that the subitems get remove in the label when I click on same checkboxes after when I add the subitems in the label?
Here's the
Private Sub listView1_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
Dim item As String = listView1.HitTest(e.Location).Item.SubItems(1).Text
Dim a() As String = Nothing
a = label1.Text.Split(","c)
[Code] .....
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