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i want to use Dijkstra algorithm to find the shortest path.
the node is fix. what i found from other source code is quite advanced where user can DRAW the node and the direction.
for my case, my node is fix and direction is fix, nothing is changing. i just want to find the shortest path, for example A to G, the shortest path is
A -> C -> D -> G. that's all.
i just need the source code to find the shortest path providing i have the matrix done. thx.
i am kind of urgent. thx!
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Why does this smell of homework? Google results[^] for "Dijkstra vb". The second link down is an article right here on CP.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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actually it is kind of project...
where i am from electrical engieering and donno much on programming...
just that when i am doing my project i need it....
so could u help? thx...
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ha... as i said i am not software student... not really know how the code work... ll try best to figure out...
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I was using the functions FindWindow() GetWindowText()in my code. The dll library used for this Funcitons is user32.dll
The error that display when i ran the functions was "No Creatable Public Component Detected" .Help -"MSDN Collection does not exits. Please reinstall MSDN".
Praveen
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That's just telling you it can't find the help to tell you what is wrong. Are you sure your pinvoke signatures are right ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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The VB code below tries to get the Window title character for the First Active Window.
I have error Poping up on my screen when I run this.
Error "No Creatable Public Component detected"
" MSDN Collection Doesn't Exits"
What i need to do to get ride of this error?
Public Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
Public Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, _
ByVal wCmd As Long) As Long
Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
(ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" _
(ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long
Public Declare Function GetWindowThreadProcessId Lib "user32" _
(ByVal hwnd As Long, lpdwprocessid As Long) As Long
Private Sub Command1_Click()
Dim tempHWin As Long
Dim StringDisplay As String
Dim CountOfBytes As Integer
Dim Buffer As String
Dim Instnace As Long
tempHWin = FindWindow(vbNullString, vbNullString)
Buffer = Space$(128)
CountOfBytes = GetWindowText(tempHWin, Buffer, Len(Buffer))
Instance = ProcIDFromWnd(tempHWin)
StringDisplay = StringDisplay & Left$(Buffer, CountOfBytes) & tempHWin & Instance
Text1 = StringDisplay
End Sub
Function ProcIDFromWnd(ByVal hwnd As Long) As Long
Dim idProc As Long
' Get PID for this HWnd
GetWindowThreadProcessId hwnd, idProc
' Return PID
ProcIDFromWnd = idProc
End Function
Praveen
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In my visual studio Axtive X Component MSFlexGrid contorl not installed. There are other Grids Control like DBGrid and DataGrid control can i use this Control to add data to the cell extracted from a web page. I have no Information on using the basic properties of the Control.
Praveen
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Are you using VB6 or VB.NET ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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OK - VB6 is crap to start with. There are probably some commercial grids, but I thought people mostly used the flexgrid.
Christian Graus - C++ MVP
'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert
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Hi.
I read on microsoft comparison chart that VB express 2005 does not support remote databases which im guessing is that same as shared network database.
is there no other way , perhaps a 3rd party app that can allow this.
Please let me know so i can consider upgrading if need be.
Regards
Robbo
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I suspect this means you can't connect to a remote DB within the IDE, I'm sure the end code can run a DB from anywhere.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Hi Christian
I guess without confusing myself, Im wanting to find out if im able to setup a shared network database. so basically i want to create a multiuser app using a centralised MDB Database where multiple users can read and write to the same database.
can you please confirm if this can be done in VB EXPRESS 2005.
Many thanks
Robbo
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Yes, you can. Like Christian said, the code you write can interact with the database without any problem. It's just htat the Express Editions of Visual Studio don't supply and Designers that will write any database code for you.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Thanks Dave. Its amazing how your always around to assist us all. I'll do some good searching for some examples etc. and of course if one comes to mind from you it will be very much appreciated. 
Robbo
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I use MS SQL Express 2005 for a Weighbridge application I have written and access the database from other computers on the network, including PC access over a WAN connection.
You should be aware that SQL Express, when installed, is configured as a stand-a-lone database, i.e. does not allow remote connections. You will need to change this within the SQL Server Configuration Manager program.
Steve Jowett
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Hi Steve
Thanks for you reply. basically at the moment my app is built with an MDB Database and was looking to get into how i can make it a mulituser app. is it only as simple as setting MODE=share deny non to connectionstring. Im sure there more to read on etc. can you offer and more assistance or material i can use.
Thanks a million.
Robbo
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is there any way to disable the print screen button
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A system wide hook, perhaps ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Thanks a lot for your reply
but I don't Know what you mean by
A system wide hook
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You can unplug the keyboard cable, or don't press the prinscreen button. Ha ha that's a joke.
Actually, you can handle it by add some action like showing a message when user press it and delete the image file from picture taken, by this:
Private Sub formname_keydown(Byval sender as object, byval e as system.keycode)<br />
If e.keycode=key.printscreen = true then<br />
msgbox("Sorry, you can't print the screen for a reason","Warning",vbcritical)<br />
system.clipboard.clear<br />
End If<br />
End Sub
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Hi All
I am writing am app that I can call from the windows services recovery tab that emails me when the service fails.
At present I have a written a service that has a counter that has a 10 second delay that throws an exception.
But on testing the service it counts 10 ten sec's and crashes but never launches the test app from the service recovery tab (Notepad).
Is the unhandled exception the same as a service failing?
How do I write an app that crashes for testing?
IDEAS....
P.S. What is even more annoying is that if I was writing a service it would have heaps of errors to debug and now the apposite 
Thanks
When people make you see red, be thankful your not colour blind.
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Take a look at dainel's article on exceptions:
Exception Best Practices[^]
It has a lot of good informaiton regarding general exception handling. Also a service should deal with the errors raised from within. In the case where an error is unhandled the domain error handler will attempt to catch it. You may wish to install a error handler in the System.AppDomain.CurrentDomain.UnhandledException
Event. This can of course call your:
japel wrote: test app from the service recovery tab (Notepad).
You can only be young once. But you can always be immature.
- Dave Barry
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The article was interesting from a error handling point of view.
I was looking for the opposite, I need a service to fail the triggers the service recovery option and let's me run a program.
Thanks
When people make you see red, be thankful your not colour blind.
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