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arcticbrew wrote: Did you run an analysis, identify the procedures that are consuming the most time, and optimize them? This would be the first step before making a decision to rewrite in another language.
No, but I have a pretty good idea where the slow code is. I execute a number of loops and the number of calculations can reach a maximum of 15000 iterations of a particular function. As it stands right now, it is taking approximately 12 hours to complete a simulation and that is, honestly, unacceptable. I really need to trim this down.
arcticbrew wrote: How large is the program? Converting to VB.Net might be the most prudent and quickest.
The program is about 5000 lines. So it's not exactly trivial to port it to C# or C++, for example. It also interfaces extensively with Excel 2000 (uses the charting functions as well as some spreadsheet entries), but on a first investigation, there seems to be a problem driving Excel 2000 with C#...something about Primary Interop Assemblies...Oh dear.
"Oh, I must've did somebody some good. I think I did. So I gave her the gun and I shot her!" - Led Zeppelin - In My Time of Dying
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1. Within Excel, ensure that the calculation mode is set to 'Manual' and not automatic.
2. VBA is interpreted; anything compiled should be faster.
3. If the application is already written in VBA in Excel, porting it to VB should be a breeze... essentially cut and paste.
Good, bad, or otherwise, I work in the VBA/Excel environment just about every day.
Tim
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Hi Tim, thanks for the response.
Tim Carmichael wrote: 1. Within Excel, ensure that the calculation mode is set to 'Manual' and not automatic.
Yes, have already done this.
Tim Carmichael wrote: 2. VBA is interpreted; anything compiled should be faster.
That's what I was thinking. But two issues. The first is: How much faster? The second is that I read that VBA is basically interfaced with Excel from a DLL and thus should have really low overhead. I am therefore suspicious as to whether or not porting it to VB is really going to improve the situation noticeably...
Tim Carmichael wrote: 3. If the application is already written in VBA in Excel, porting it to VB should be a breeze... essentially cut and paste.
Yes, but it uses the charting functionality of Excel extensively. I was trying to do a preliminary investigation as to whether or not I could write this in C#, but there seems to be an issue with the Primary Interop Assemblies between C# and Excel 2000. From what I have read, it would seem that I need Excel 2003 or even Office XP to get around this. I don't know if there is a solution for Excel 2000. Gah, what a mess!
"Oh, I must've did somebody some good. I think I did. So I gave her the gun and I shot her!" - Led Zeppelin - In My Time of Dying
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I feel your pain...
If you need to use the charting functions in Excel, it it possible to offload the processing into a DLL?
I have some user-written Excel spreadsheets (again, for charting) that use a great deal of data... as much as possible, I have modified the VBA code to offload processing to a DLL or a stored procedure. The only interaction with Excel then is: get the data, put the data, chart the data...
If I can help, let me know.
Tim
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Tim Carmichael wrote: I feel your pain...
Tim Carmichael wrote: If you need to use the charting functions in Excel, it it possible to offload the processing into a DLL?
I'm not exactly sure what you mean. Are you suggesting I write the calculation/simulation code in Visual Basic and compile it to a DLL and then call the DLL from VBA in excel? Or is it the other way around? Package the Excel charting capability into a DLL and call that from my VB app?
"Oh, I must've did somebody some good. I think I did. So I gave her the gun and I shot her!" - Led Zeppelin - In My Time of Dying
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Well... from my end, the charting was done directly in Excel with VBA calling DLLs written in VB to do the bulk of the work.
I have had opportunity to write code that opens Excel spreadsheets... but that caused other issues and was difficult to debug what was happening in Excel.
But... either way works.
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Tim Carmichael wrote: Well... from my end, the charting was done directly in Excel with VBA calling DLLs written in VB to do the bulk of the work.
I have had opportunity to write code that opens Excel spreadsheets... but that caused other issues and was difficult to debug what was happening in Excel.
But... either way works.
Yes, packaging the simulation code into a DLL could be a solution rather than involving C#. However, I was unaware that you could call a DLL using VBA under Excel. Do you have any documentation on how to do that? Maybe that's a silly question, but I mean my experience with VBA is quite minimal...
I only have access to Visual Basic Express (the one Microsoft released for free). Can I build a DLL using that? This would be a nice approach because the simulation code is already written in VBA so it would just be a matter of packaging it up into the DLL, building it and then calling it from my charting macro under Excel.
By the way: thanks for all the help. Greatly appreciated.
Well, who the hell wrote your fast, stable Slackware distribution? Wandering minstrels?"
"Outlook not so good." That magic 8-ball knows everything! I'll ask about Exchange Server next.
If I had wanted your website to make noise I would have licked my finger and rubbed it across the monitor.
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We frequently call COM objects written in VB from VBA (either in Excel or a reporting package). So, in theory, you should be able to take the code, massage it into VB Express, write a COM object and call it from Excel...
I just ran a current VB 6 DLL through the upgrade wizard to confirm what it would create... a new project as a class library.
Assuming you can create a class library from VB Express, you should then be able to call the component.
I don't have VB Express on my work PC, but I do on my home PC... I can look at it this weekend and hopefully provide a simple working example.
Also, talked to a co-worker who said that we are currently calling .NET components through SQLServer jobs using scripting, so... it should work.
Tim
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Oh this is good. It should take a minimal amount of time to do this and avoid the C# route. That would be great!
A working example would be excellent if you have the time. I can't say how helpful you've been. Thanks alot, Tim.
I'll fire up VB Express tonight and see if I can build the DLL.
"Outlook not so good." That magic 8-ball knows everything! I'll ask about Exchange Server next.
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And.. isn't this help the purpose of Code Project? I may not necessarily use a lot of code from here, but I can certainly get ideas on how to improve items...
Tim
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The Apocalyptic Teacup wrote: I'll fire up VB Express tonight and see if I can build the DLL.
Let us all know how it goes. Help is always here
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Paul Conrad wrote: Let us all know how it goes. Help is always here
Hi Paul,
Although I haven't actually built the DLL (I will reserve that for tomorrow as I'm working on Paris time), I did open up VB Express and there is indeed the ability to build a DLL. Looks like there is a solution that doesn't involve porting my existing code to C#. Will be quite the time-saver.
"Outlook not so good." That magic 8-ball knows everything! I'll ask about Exchange Server next.
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Sorry for another reply, but it seems as though I've gotten around the problem with the interop assemblies. I've posted my work-around here[^]. I know now that I can access and write to an Excel 2000 spreadsheet. If necessary, I can fill the cells and then use my existing VBA code to do the charting from button_click() event or something. Beautiful!
I am still curious about your DLL suggestion, however...
"Oh, I must've did somebody some good. I think I did. So I gave her the gun and I shot her!" - Led Zeppelin - In My Time of Dying
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I would suggest that if you are sticking with your database in Excel, then
VBA is almost as suitable as any language to process the data, unless
the language functionalities of C++ can better improve perfomance (considering re-writing the
code in an object orientated environment)
But accessing data such as Excel databases, can decrease performance if it is called
by an external application.
Another thing that also i personally find in VBA, is that it is very memory intensive and
that may effect the speed of the data processing.
An ideal solution would be if you manage to migrate out of Excel, into a more
scalable database solution, such as an SQL Server, or at least MS Access.
Thus an external application can make multiple calls to data in a more optimized way.
Of cource i am saying all this without an idea of exactly how or how much data is being processed.
Personally, i like the combination of VB.NET and SQL Server, for an easy to use, scalable
and secure environment.
Hope i could help.
p.s i wrote all that and then turned the page to see the replies you already got :P
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ad3z wrote: But accessing data such as Excel databases, can decrease performance if it is called
by an external application.
Another thing that also i personally find in VBA, is that it is very memory intensive and
that may effect the speed of the data processing.
I am "not really" using a database. Rather, I am doing alot of mathematical calculations and storing some of that data in re-sizeable arrays. So there is alot of memory access going on. The main reason that I am using VBA under Excel is for two reasons:
1. The ability to display nicely arranged data in the spreadsheet
2. The charting functions
As for the number of calculations, it is basically a binomial tree[^] structure with a maximum of 4000 levels. Thus I calculate 2 levels of the tree to 4000 levels inclusive so the number of calculations is basically a sum of 4000 to 2 inclusive: 4000+3999+3998+...+3+2. In other words, it's ALOT. I think the majority of the slowness is due to the arrays I am using. I really have two options:
1. Offload the processing to a DLL and solely use Excel for the charting
2. Re-write the code in C#. I'm actually going to do both at this point to see the results and, just maybe, write a CodeProject article about it comparing the two approaches.
We'll see.
Thanks for the reply!
"Outlook not so good." That magic 8-ball knows everything! I'll ask about Exchange Server next.
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I'm developing a project of collecting email id and storing them in the database and to support POP and SMTP service. For that I want to know how to send email from VB to SSL supported site?
Subham Rakshit
Software Developer
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I have a form with a variable that is a custom object. I would like to bind certain controls (text and combo boxes) on my form to properties of the object. Thus if the user changes the value of a text box the corrisponding property of the object is updated. How might I bind a control to a property of the object?
Cheers
Visual Studio .Net 2005
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Hi
I have made one quiz application with 3 forms and first one is just users name and then user need to click on button so next forms appears on screen,But the first form also remains on screen i tried with myform.hide and it's works but when user finish the quiz then it's shows me error
So how can i solve this problem,This is what i have done
And if i dont use myform.hide and if i close form first then all quiz closes
<br />
Private Sub btnType_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnType.Click<br />
Address = StrConv(txtName.Text, VbStrConv.ProperCase)<br />
Dim MyForm2 As New frmSQuiz<br />
If Trim(txtName.Text) = "" Then<br />
MsgBox("Please enter your name", MsgBoxStyle.Exclamation, "Error")<br />
Exit Sub<br />
Else<br />
MyForm2.Show()<br />
MyForm2.ActiveForm.Text = "Well Come " & Address & " to Type - In - Answer Section ...."<br />
txtName.Text = ""<br />
btnType.Visible = False<br />
btnMultiple.Visible = False<br />
End If<br />
End Sub
any help
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Don't make your login form the Startup form. The main form of your application should be the start form. When it starts, it should check to see if a user is logged in and, if not, show the login form.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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First of merry x-mas sir
And thanks for your rep.
I understand ur point and i tryed it but it's starts application without logged in so wr do i need to wright that code b cos i am new in vb.net sir
And this code is for first form
Private Sub frmQuiz_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load<br />
Time = Now<br />
lblTime.Text = Format(Time, "d MMMM yyyy")<br />
btnType.Visible = False<br />
btnMultiple.Visible = False<br />
End Sub<br />
Private Sub btnStart_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnStart.Click<br />
Address = StrConv(txtName.Text, VbStrConv.ProperCase)<br />
If Trim(txtName.Text) = "" Then<br />
MsgBox("Please enter your name", MsgBoxStyle.Exclamation, "Error")<br />
txtName.Focus()<br />
Exit Sub<br />
Else<br />
btnType.Visible = True<br />
btnMultiple.Visible = True<br />
End If<br />
End Sub
so please help me with this
wating for your kind rep.
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You're going to have to reorganize this code. In your Form_Load, you can setup your applications basics and check for a user being logged in. You'll have to put something together to keep track of the users login, maybe an ID or a username.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Perhaps, set your application to not close when startup form closed, this can be found in the project properties (go to project on the main menu and select properties). Then you can say myform.close, closeing the login form once the other form is opened.
Posted by The ANZAC
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Hello
Thanks for your kind rep.
But i could not fine that type of property in project property so can you please kindly tell me how can and which property do i need to change
I checked main project property but still i have no idea what to do
thanks
wating for your kind rep.
have a nice time
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Hello Again
Thanks both of you sir
I have done it, I create my own sub main and then I call application.run() and same in application.exit(), so i just wanto know that is this the right method or not ?
I realy thankful to both of you Dave Kreskowiak and The ANZAC
Thank you very much
byyyyyyyyyyyyyyyy
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