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I kept on asking myself what do you mean when you say "utility page". But atleast someone tought you a lesson, next time you will think befoer you post here.
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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Im communicating with a PLC which works on MODBUS RTU protocol. Need to continuously monitor the registers in it using serial communication. Iv used RS232 Class which i found from Codeproject. Im using a timer object to continuously send read/write command on the port. Iv Set Timeout period as 1000ms and Timer's Interval time as also 1000ms. After a few cycles communication fails and it prompts NULL Exception Argument.Can you Plz guide with it.
Jalpa
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There are also some articles about MODBUS here at CP [^].
See also these pages [^], [^].
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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First of all thanx for replying. Iv tried all those links but none of them worked. Since in coding in VB.NET it does not provide me with any readymade class so iv included a class called as CRs232 which I found through the NET. I think the NULL EXCEPTION ARGUMENT that im getting is due to the incorrect CommTimeOuts that iv set. So if you could help me with a method for finding out the correct Time-Outs.
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jalpam wrote: Since in coding in VB.NET it does not provide me with any readymade class
Are you sure [^]?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Ya sure. That may be because im using Microsoft Visual Studio.NET 2003. The code that the link has provided would be supporting some other version of Microsoft Visual Studio.NET
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Possibly you just need this [^].
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[Image resize DLL]
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Thanx for the link......
I tried changing the CommTimeOuts and it worked. Now wat im trying to do is that every 500ms i need to dump the registers which i hav read through communication into a DataGrid. When i disable the grid and jus read the registers in a listbox its works but the moment i try to read it in a Grid it fails.
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Hi,
I am working on application,which requires fetching data from an Excel sheet,for a particular row.
Please suggest me hw I can do it.
Thanks in advance.
G Singh
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What have you done so far?
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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hi everyone,
I have one problem while using this split function in vb.net.
actually my requirement is i have a valuepath of my treeview control.
and i have to split it in a reverse direction.
Ex.
M002/67/03/26/21.....
i want this to be split in reverse like i have to get the date of 21 next 26 next 03 like that
hope u all understand my need..
waiting for ur replies...
thanks
Prasad.M
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You cannot split in reverse... You should split the string, and than either loop through the array in reverse order, or reverse the array and loop through the array
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is there any possible way to record the printed job, doc name, user, date/time with vb 2008.. i haven't reached deep enough to vb 2008, so pls help me
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well.. first,, thanks anyway.. Mr..Jones
i've got some idea according to your reply.. it's also better to get a complete project which connects to the database and records the user_info/printed date_time/doc_info/ bla bla bla.... wow.. i know i am expecting too much..i am just expressing my needs actually. i am gonna try it anyway.. just let you know to share with me when you found something related to my desire.. every reply from you will be highly appreciated..thanks and bye
back to vb
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aungthiha wrote: it's also better to get a complete project which connects to the database and records the user_info/printed date_time/doc_info
That sounds like the Printer Usage Monitoring Application[^] then.
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it's so great to see that powerful application.. and another thing is i've found a component called PrinterMonitorComponent(the one you posted on another subject..) it's also useful for me.. now i am using that component but not effectively yet. coz i don't have sql server yet so that i can't run the app you shared me.. thanks anyway. one more thing  do you have some code which expresses about PrinterMonitorComponent. keep smile... thanks
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hello
i am a computer engg student of final year.
so i making a project in final year.
i have choose any one of below. this project in vb.net 2005
1: antivirus
2: datasecurity
3: bluetooth hacking the mobile
4: compiler
5: data hidden in image
6: 8086 compiler
7: database managment system like oracle,ms acess
so plz give me some idea abt my above project.and related website.
reply me immediate. the last date is comming soon.
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I think picking one of the items in the list strongly differs per person. I would chose a database management system because I think i'm best at that topic, compared to the others in the list. However someone with loads of knowledge of virusses may pick the antivirus. It would be a nice poll on CP's main page
The one and only related website of course is codeproject![^]
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hello,
i am making a dataconvertor in vb.net 2005.
i want to change my datagridview column's style at runtime from combobox to textbox. i have used cell template and other property.but couldnot get solution.
when i click in column then it become textbox.and when i leave that column then it become combobox.
i have used database in that datagridview.
note: change column type without combobox's view poperty.
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HELP!!! rs.fields(i).value is destructive
VB6. ODBC, ADO, SQL Server
I think that I am going crazy.
1 program seems to get this problem intermittantly.
I can only read the data once. They it goes to null
ODBCRS.Close:Set ODBCRS = ODBCCon.Execute(SQLString, iRecordsAffected)
? ODBCRS.Fields(93).Value,ODBCRS.Fields(93).Value
Sergio Null
Even ? ODBCRS.Fields(94) will charge field 93 to nulls
It does NOT happen on all fields. Field 94 in this case works fine.
What am I missing?
Help!!!!!!!!!!!!!
Jack
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When you read blob fields (text, image, et.c.) from a recordset, they have to be read in the exact order that they come in the recordset, i.e. row by row, field by field, and each field can only be read once. If field 93 and 94 are blob fields, you have to read field 93 first, then field 94. If you read field 94 first, you skip past field 93 so it's discarded.
The reason for this is that the data for those fields can be much larger than the input buffer, so the data is sent in a separate stream. You can only read the data for the blob fields in the order that it comes in the stream.
Despite everything, the person most likely to be fooling you next is yourself.
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