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i want a sample program to draw a barcode and to read a abarcode?
using vb.net
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I had made an application in VB 6 in which i used Bar Code. I printed the barcode on the Employee Card. You dun have to do any thing there are fonts available throug which u can make bar code. e.g. if u have a report in which u want to have barcode just chage the font of the field the barcode will be displayed. and for reading barcode u dun have to code when bar code reader will read the bar code a text(against which bar code was generated) will be available where the cursor will be blinking. u can search bar code font on net these are free just install these and use
Regards...
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Dear Ser
I need to create a web service client for the web service
[http://www.handigeproducten.nl/webservice/].
I tried to modify a large number of examples from different textbooks and internet sites. Not even one works!
Convinced as I am that it should not be difficult I have the brutality to ask you to provide me with a working example. A very simple example will do. For instance a simple application or html page on which the user provides an 'item number' and the page/application shows the results by sending information to the web service and showing that information on the html-page.
(We used to do this with a 'post', but this method is no longer supported by the web service)
< I am not developer but am trying to write the client >
Ours sincerely
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Build your own example. Create a WebService with but a single method in it. All it does is return the number 1. This is as simple as it gets...
If you can't get a single example to work, what makes you think that anything anyone sends you will work either?
A WebService doesn't return an HTML page, unless it's written to do so. It's normal return is just some data like any other method you find in a class. It's up to your Web Forms ASP.NET code to do something to format the data and present the new page to the user.
codexploid wrote: < I am not developer but am trying to write the client >
What experience do you have writing code? HTML?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Dave Kreskowiak wrote: What experience do you have writing code? HTML?
I am NOT profesional in HTML and beginner whit VB.NET
I know it is simple, bat do not know what to do exactly?????
If you have some tutorial or know the staps what need i to do?
Than help my pliz.
Sorry about my English
My Russian is better then my English
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There isn't much to this. It's best to have IIS installed on the machine you're developing this web service on. Preferrably installed BEFORE Visual Studio .NET was installed.
All you have to do is create a Web Service project, tell it the server and project name you want to use, then add code for your WebMethods to the class. Build the project, and a web browser will open to test it.
A quick example class looks something like this:
Imports System.Web.Services
<System.Web.Services.WebService(Namespace:="http://tempuri.org/WebServiceSandBox/Service1")>
Public Class WebServiceTest
Inherits System.Web.Services.WebService
<WebMethod()> _
Public Function TestMethod() As Integer
Dim r As New Random
Return r.Next(Integer.MinValue, Integer.MaxValue)
End Function
End Class
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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As my Question before,
I have search for "Invalid parameter used" on the google.
I found that many programmer also get this problem,
When some image dispose, like myPictureBox.image.dispose(),
It will always have the error "Invalid parameter used"
Any article for this issue?
Thank you!
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No. I've never had the problem. It sounds like your missing a step in your code, like not setting the Image property to Nothing after your dispose the Image?
You can see this[^] for an example.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have an Error after finish a msgbox line.
After I comment the line, it works fine.
The error is
An unhandled exception of type 'System.ArgumentException' Occured in system.windows.forms.dll
Additional information: Invalid parameter used.
What's wrong??
Thank you!
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cylix2000 wrote: What's wrong??
With what? The thing you're holding behind your back?
Come on... If you're going to ask a question like "what's wrong with my code?", you have to show us the code that's throwing the exception!!
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi, I am using the following code to update records in an access table using vb.net.
Dim dr As OleDbDataReader
Dim qry As New OleDbCommand
Dim ucon As New OleDbConnection
Dim inssql As String
inssql = "Update PriceTable set Price = " & newprice & " where ID = '" & id1 & "' and Period = '" & Trim(period) & "'"
qry = New OleDbCommand(inssql, ucon)
dr = qry.ExecuteScalar
What I want to check is if the query has been executed correctly. i.e. if id1 (id1 matches with ID from PriceTable) exists in PriceTable, then it will be executed successfully. However, if the id1 is not present in PriceTable (id1 does not match with ID in PriceTable), then how do I know that the qry has not been executed.
Please provide assistance ASAP.
With Best Regards,
Mayur
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mayhem_rules wrote: qry.ExecuteScalar
shouldn't this be ExecuteNonQuery()...
This is the statement that does Update, Insert and Delete.
It returns the number of rows affected.
Jesus Loves ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
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ExecuteNonQuery it returns no of rows effected by the query. use this:
Dim dr As OleDbDataReader<br />
Dim qry As New OleDbCommand<br />
Dim ucon As New OleDbConnection<br />
Dim inssql As String<br />
dim iNoofRows as interger<br />
<br />
inssql = "Update PriceTable set Price = " & newprice & " where ID = '" & id1 & "' and Period = '" & Trim(period) & "'"<br />
qry = New OleDbCommand(inssql, ucon)<br />
<br />
iNoofRows = qry.ExecuteNonQuery 'Instead of qry.ExecuteScalar<br />
<br />
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Thnx guys for your reply. I will try out your solution. However, what I need to know is whether every execute statement is successfully completed. If not, then I need to maintain a log of the records (ID's, Price) which have not been executed successfully for the user to analyze. How can this be done.
Thnx again.
With Best Regards,
Mayur
-- modified at 1:43 Friday 20th January, 2006
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mayhem_rules wrote: However, what I need to know is whether every execute statement is successfully completed.
That is what ExecuteNonQuery returns.
It returns the number of rows affected by the said query. So if it returns 0 it means no rows affected.
Jesus Loves
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
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Thnx, I will try it out and let you know. Another query that I have is how do I maintain a log file to record all the transactions.
With Best Regards,
Mayur
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Thnx. But I am a real fresher in .NET. The instructions that you have provided have gone way above my head . I wil be glad if you could explain it to me in some simpler terms.
With Best Regards,
Mayur
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This can be done is the database's SQL code. Table triggers are commonly used to log information such as this.
Though, this technique is not supported in Access! Real SQL databases only!
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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mayhem_rules wrote: inssql = "Update PriceTable set Price = " & newprice & " where ID = '" & id1 & "' and Period = '" & Trim(period) & "'"
Please learn about SQL Injection Attacks and tips on how to prevent them[^] otherwise this code is going to get you 0wn3d!!!!111
ColinMackay.net
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
"If a man empties his purse into his head, no man can take it away from him, for an investment in knowledge pays the best interest." -- Joseph E. O'Donnell
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Sorry, did not get you. Neway, I m using MS Access. some usefull tips will be helpful.
With Best Regards,
Mayur
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mayhem_rules wrote: Sorry, did not get you.
Your code is succeptable to a SQL Injection Attack. A mallicious attacker could gain control of your database through your web application if you don't defend it.
The article I linked to will explain what a SQL Injection Attack is and it will give some advice on how to defend yourself from it.
mayhem_rules wrote: Neway, I m using MS Access
Dismissive attitudes like this cause security problems. Regardless of the database platform you are using you need to at least understand what security threats exist in order for you to put together even a basic plan of defence.
ColinMackay.net
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
"If a man empties his purse into his head, no man can take it away from him, for an investment in knowledge pays the best interest." -- Joseph E. O'Donnell
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Anyone here knows how to trap the mouse cursor in the main form of a vb .net application? so that the user won't be able to use windows until it is unlock. can somebody help me with this?
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