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Hello everyone and thanks for looking, my group and I have been working on a project at school for our senior project and we have run into a little snag.
We have a program in VB.net designed to connect using USB communication to a development board to interface with a microcontroller, the program is successful and we have only one last problem to solve.
When the program first starts up we would like it to automatically run a command within the program, specifically this button:
Private Sub cmdConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdConnect.Click
OpenMPUSBDevice()
If myOutPipe <> INVALID_HANDLE_VALUE Then
Timer1.Enabled = True
End If
End Sub
Basically what we would like to happen is that once the program is first run this button "auto-clicks" itself to automatically connect through USB to our development board then could be used later for reconnect if possible. We tried to encapsulate it into a simple while loop but the button needs to be clicked prior to entering.
I tried implementing something like this:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
cmdConnect.PerformClick()
End Sub
But ended up receiving this error:
------------------------------------------------------------------------
Microsoft Development Environment
An unhandled exception of type 'System.Security.SecurityException' occured in USBAuto.exe
Additional information: System.Security.Permissions.SecurityPermission
------------------------------------------------------------------------
Where in the program the command: OpenMPUSBDevice() was highlighted
I’m sorry if I’m asking a really easy/hard question as programming is not my specialty, hardware person myself, any help would be greatly appreciated,
-Prower
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Try
Call cmdConnect_Click(cmdConnect, New System.EventArgs())
On form load...It will eork
Good Luck
Nishkarsh
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Thank you so much I just assembled the program and it seems to be working
Can I make use of this command on a check box as well? And just alter the syntax to that of a check box?
Such as:
Call cbIO1High_CheckedChanged(cbIO1High, New System.EventArgs)
So that on load the check box is high the use a delay for say a second then un-check the box? And I know I can just go under properties and just set it to be checked I am just wondering if it is possible for a checked box to be un-checked on start up then checked for a second or so then set back to un-checked
Thanks again
-Prower
modified on Saturday, February 9, 2008 6:54 PM
<div class="ForumMod">modified on Saturday, February 9, 2008 6:59 PM</div>
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Better yet, refactor out the code in this Click handler to its own method. Then you can call it from both the Click handler and your other startup code without bothering with PerformClick.
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hello everyone,
i have a problem i wish you could help me with it...
how can i make the datagrid become a data entry? and how to make a " Save button " for it?
i hope you could help me because this is the only problem i currently face in my new software...
thx very much....
ok that's cool
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The documentation[^] explains how to use the DataGrid control for CRUD operations. I suggest you read it and only post again if you have more specific questions.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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hi Paul is Right and buying a book will be another good idea.
check this it might help you
http://www.codeproject.com/KB/vb/N-Tier_Application_VB.aspx[^]
Hope it helps
Vuyiswa Maseko,
Sorrow is Better than Laughter, it may Sadden your Face, but It sharpens your Understanding
VB.NET/SQL7/2000/2005
http://vuyiswamb.007ihost.com
http://Ecadre.007ihost.com
vuyiswam@tshwane.gov.za
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I need my vb application to act on a non windows application by activating it and sending mouseclicks to it and also doing optical character recognition on it at the same time.
Anyone know where to look to do this?
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karl kruse wrote: I need my vb application to act on a non windows application by activating it and sending mouseclicks to it and also doing optical character recognition on it at the same time.
Wow  Not asking for much, are you?
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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Hello everyone,
I would like to get a table in my richtextbox.
If this is possible how you do it?
And can somebody help me on the way.
Best regards,
Vincent
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Hi everydbody,
I'm developing a VB.NET 2003 application and I need to include in my layout a table that I can dynamically set row/col spanning to, like in the HTML tables. I've taken a look to the datagrid control, but it obviously doesn't have those properties. So, what I need is somebody who can give me a hint on how to program this, or if somebody knows of a control developed by someone on the web that has this functiontality please, provide a link.
I've thought, for the developing option, that maybe a panel based table could help me out achieving this, but yet I'm not sure. So, I'm open to any ideas.
Thanks in advance,
Kenia
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Does anyone know of any good examples NOT in C# that takes you through the entire process of saving an image to the database. On my form I have an openfiledialog and a picture box. When an image is selected from the openfiledialog the images is opened in the picture box. If you do not know of any good examples or tutorials but know how to do it, please give me a somewhat detailed example or description. PLEASE SOMEONE HELP!!!! I have been going in circles all week trying to learn this... Thanks!!!
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If you have found examples in C#, use a code converter to convert the code to VB.NET.
ALternatively, learn C#. Then you'll understand the examples, no matter what language they're written in.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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GO to MSDN site and there you will find VB101 Samples u can download it, it is going to put 101 VB sample programs on your system. In those programs there is one code for saving image in DB
Good Luck
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I have a form with a databound combobox. When the form is instructed to close, for some reason, the selectedindexchanged event decides to fire, which causes some undesirable results. There is nothing in the close event handler except a call to show the owner of the form being closed.
What can I do to stop this event from processing, or at least prevent the code in the event from running on form close?
"In the middle of difficulty lies opportunity." Albert Einstein
modified on Friday, February 8, 2008 11:59 AM
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Could it be the combobox clears its items just before the form closes? Possibly as part of the disposing process?
Regards,
Thomas Stockwell
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Visit my homepage Oracle Studios[ ^]
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yeah, it was, I caught the thing with a selectedindex of -1. Thanks for the help!
"In the middle of difficulty lies opportunity." Albert Einstein
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Hi,
How can i get the coordinates (in pixels) of selected text in a webbrowwser control?
Thanks,
Ahmad
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Hi All,
Can I modiy any windows application by using Windows API? although I have only Setup of that system.Is there any way?
Regards
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Syed Ali Raza Rizvi wrote: Can I modiy any windows application by using Windows API? although I have only Setup of that system.Is there any way?
Yes, you can use the File handling APIs to rewrite the files on disk thus modifying the application.
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Can u tell me any link or website where i can get detailed information about File handling APIs.
Thanks in Advance.
Experience is the sum of all the mistakes you have done.
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Syed Ali Raza Rizvi wrote: Can u tell me any link or website where i can get detailed information about File handling APIs
Look up MSDN.
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Hi!
My aim is to scroll richtextbox automatically according to serached and found text in it. How can I do that?
Thanks
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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Hi,
You can do this by using the Find Method of RichTextBox. Below is the code snippet for the same.
BEGIN CODE
PrivateSub btnFind_Click(ByVal sender AsObject, ByVal e As EventArgs)
Dim startindex AsInteger = 0
If txtSearch.Text.Length > 0 Then
startindex = FindMyText(txtSearch.Text.Trim(), start, rtb.Text.Length)
EndIf
' If string was found in the RichTextBox, highlight it
If startindex >= 0 Then
' Set the highlight color as red
rtb.SelectionColor = Color.Red
' Find the end index. End Index = number of characters in textbox
Dim endindex AsInteger = txtSearch.Text.Length
' Highlight the search string
rtb.Select(startindex, endindex)
' mark the start position after the position of
' last search string
start = startindex + endindex
EndIf
End Sub
END CODE
Hope this helps  .
Regards,
John Adams
ComponentOne LLC
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Hi to all
if i type B in text box which is for qualification of user input then
it should write like B.COM or B.E.
Thanks & regards
Sonia.
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