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Hello
I am writing an program that will use a bar code scanner to scan products. The product code will be looked up in a database and return the details of the product to the windows form.
I have never worked with this barcode hardware before, and before l purchase some a bar code scanner. I need some questions answered.
Does the barcode scanner come with any software?
It is easy to interface a c# windows program with a barcode scanner?
Does the barcode scanner connect through the USB port?
Does anyone know any example programs where this has been done?
Thanks very much in advance,
Steve
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Probably this article[^] might to of help to you.
I've just worked once with barcode scanners. I don't remember the name of this scanner nor of the used drivers but it was plugged into USB and just entered the read barcode number into the active textbox (didn't matter if it was Word, Editor or any special application). This way my application didn't need to know anything about barcode scanning - it just waited for input.
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If you get a Keyboard wedge barcode scanner then when you scan an item the barcode numbers are simply outputed to the textbox (or other control) that has current focus. With the keyboard wedge there is no need for any specific software or drivers.
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All of your questions depend HEAVILY on the barcode scanner that you pick. They come in different interfaces (USB, keyboard wedge, serial port) and will either come with drivers or not. The single, most important piece you need is the DOCUMENTATION that comes with the scanner. That will tell you everything you need to know about interfacing with the scanner.
You'll have to do your own research as to what is going to suit your applications needs.
Example programs, probably a few out there, but not many, simply because this is a very narrow application market. Besides, these really are simple devices to interface with. There's not much to listening for a string of information comming from them.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hello,
Thanks for all your advice. I think the keyboard wedge would be the better one for me.
Steve
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I want to have a random number between 0 and 99. In C#, how can I do?
Thanks in advance!
Hung
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Easy. Use the System.Random class.
Random numberGenerator = new Random();
int randomNumber = numberGenerator.Next(0, 100);
-- modified at 4:29 Sunday 15th January, 2006
(Fixed the mistake that Ethan found.)
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Actually, it should be:
Random numberGenerator = new Random();
int randomNumber = numberGenerator.Next(0, 100); because the maximum random number returned will be maxVal-1.
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You're absolutely right. I made a boo boo. My bad. 
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Don't worry - That got me when I first used Random as well. A very badly named parameter in my opinion.
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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Hi, I am currently learning how to use C#. I have encountered a problem however, I want to make a program with features like adobe photoshop's tiny windows(I mean when we create a new image, a small window for image editing will appear) in the actual program. I don't know how to accomplish this task. Does anyone know how? Thanks
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Create a new WinForm class for every different kind of "tiny window" that you'll need. You'll probably want to add public methods so that the main form can control their contents.
In your main form's class, create member variables for every tiny window that you have. Then have your main form display them "modelessly" via Form.Show().
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Greetings All,
Can anybody pls help in the following.
i have written 2 functions getRecordList and GetRowsList. i am getting casting problem vaResultSet = (string[])GetRowsList(ref SqlDataReader, nStart, nrows); in getRecordList function. can anybody pls have a look at my code pls give your valuable suggestions and mistakes in code. its some what urjent and really it will be very greatful for your earliest replies. thanks in advance.
protected string[] getRecordList(StringBuilder vaInput)
{
setCallerDetails();
SqlCommand sqlCommand;
SqlDataReader SqlDataReader;
string[] vaResultSet;
string[] vaOutput = new string[4];
string szSql;
long nStart;
long nrows;
long nRecordCount = 0;
short i;
try
{
if (Information.IsArray(vaInput))
{
szSql = vaInput[0].ToString();
nStart = vaInput[1];
nrows = vaInput[2];
}
else
{
szSql = vaInput.ToString();
nrows = - 1;
nStart = 1;
}
string StrLastSQL = szSql;
if (openDatabase() == C_RET_SUCCESS)
{
if (Information.Err().Number == 0)
{
if (szSql.Length> 0)
{
sqlCommand = new SqlCommand(szSql, sqlConnection);
sqlCommand.CommandTimeout = iCommandTimeOut;
SqlDataReader = sqlCommand.ExecuteReader();
vaResultSet = (string[])GetRowsList(ref SqlDataReader, nStart, nrows);
if (Information.IsArray(vaResultSet))
{
for (i = 0; i <= Information.UBound((System.Array) vaResultSet, 1); i++)
{
if (Information.IsArray(vaResultSet))
{
nRecordCount = nRecordCount + vaResultSet[1];
}
}
}
else
{
nRecordCount = 0;
}
vaOutput[0] = "E" + Information.Err().Number;
try
{
if (Information.IsArray(vaResultSet))
{
if (Information.UBound((System.Array) vaResultSet, 1) == 0)
{
vaOutput[1] = vaResultSet[0][0].ToString();
}
else
{
vaOutput[1] = vaResultSet.ToString();
}
}
}
catch (Exception ex)
{
HandleError(ex, C_CLASS_NAME, true);
}
vaOutput[2] = nRecordCount.ToString();
vaOutput[3] = Interaction.IIf(! Information.IsNothing(vaResultSet), Interaction.IIf(Information.IsArray(vaResultSet), Information.UBound((System.Array) vaResultSet, 1), 0), 0).ToString();
SqlDataReader.Close();
}
else
{
vaOutput[0] = "EC01";
}
}
else
{
vaOutput[0] = "E" + Information.Err().Number;
}
closeDatabase();
}
}
catch (Exception ex)
{
vaOutput[0] = C_RET_FAIL;
HandleError(ex, C_CLASS_NAME, true);
}
return vaOutput;
}
**************************************
protected object GetRowsList(ref SqlDataReader oReader, long nStart, long nRows)
{
int nCols;
long rCnt = 0;
long nbegin = 0;
long nEnd = 0;
ArrayList vaResultSet = new ArrayList();
bool bAll = false;
bool bExit = false;
//sai need to check above 2 variables false or true
try
{
do
{
rCnt = 0;
nCols = oReader.FieldCount;
if (nStart == 1 && nRows == - 1)
{
nbegin = 0;
bAll = true;
}
else if (nStart > 0 && nRows == - 1)
{
nbegin = nStart - 1;
bAll = true;
}
else if (nStart > 0 && nRows > 0)
{
nbegin = nStart - 1;
nEnd = nbegin + nRows - 1;
}
ArrayList vaArray = new ArrayList();
while (oReader.Read())
{
if (! bExit)
{
if (nbegin <= rCnt &&(nEnd >= rCnt || bAll == true))
{
try
{
object[] values = new object[nCols-1];
oReader.GetValues(values);
vaArray.Add(values);
}
catch (Exception ex)
{
HandleError(ex, C_CLASS_NAME,false);
//sai need to check, boolean is true or false
}
}
else if ((bAll == false) &&(nEnd < rCnt))
{
bExit = true;
}
}
rCnt = rCnt + 1;
}
object[] vaOut = new object[] { vaArray, rCnt };
vaResultSet.Add(vaOut);
} while (oReader.NextResult());
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString());
HandleError(ex, C_CLASS_NAME,false);
}
return vaResultSet;
}
Thanks in advance
Sai
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I see two issues here.
1) Your GetRowsList() method's return type is Object, but it actually returns an ArrayList. You lose type safety because of this. It would be better to make the return type more explicit such as ArrayList or at least ICollection.
2) You're casting the returned ArrayList into a string array, which of course it is not.
Here's a solution. Why not not make the return type of GetRowsList() a string[]? You can then convert the ArrayList to a string array and return that instead. Then you can remove the the cast done in the other function.
protected string[] GetRowsList(ref SqlDataReader oReader, long nStart, long nRows)
{
ArrayList vaResultSet = new ArrayList();
return (string[])vaResultSet.ToArray(typeof(string));
}
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Hi all,
I want to create an application that create a movie (mpeg-2) from seperate images.
please anyone help for an idea, links, component, API or resourcess. Currently im newbie in mpeg-2.
Thanks for your help.
Tutnik,
University of Udayana, Bali, Indonesia
-- modified at 0:44 Monday 16th January, 2006
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Check C# multimedia section.
Just an advice, avoid to write so freely your email if you don't want hundred of spam email into your e-mail.
Bye
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Just as another user of this forum i've a big problem!!
I've a list of custom controls i've to show inside a panel one under the other.
I've created a custom scrollbar made by 3 panels 2 for button up and down the other for the scrolling.
Now i've to add these Controls inside the panel but if they are 1000 i can't put all of these!!
Then ho can i scoll them using my custom scrollbar?
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You really have to rethink your design. You can't put 1,000 controls on a form and expect it to run.
That's 1,000 windows on the form and a window handle to get with each. You're form will take forever to come up while all those controls are just added to the form. That doesn't include drawing them! You might be able to get away with managing to add only the visible controls to the form, but be prepared for a complicated design.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have to agree with Dave. You should tell us what you want to display. Probably a customized grid control or something like this would fit better in your situation.
If you still want to use controls you will have to make a UserControl, add your scrollbars to it and then manually reposition all controls when your scrollbars are changed.
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the control is made by a panel with an image as background, some label end textbox within.
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Cuold be done by a grid control. Search for Source Grid 3. It's really cool. You surely would have to exchange the scrollbars.
Another idea:
Instead of placing so many of your controls into one panel you could only place as much as fit into it. When the user then scrolls you just need to exchange their content - not actually scrolling them.
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where have i to serch for Source Grid 3? In this forum?
Another thing how i can to exchange the scrollbars?
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1. http://www.devage.com/[^]
2. You will probably have to figure out it yourself. As you can get the whole source code you will just have to find the scrollbar and replace it.
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is it possible to do that using DataGrid or other fully freely controls as Visual Studio are.
i'm forced to wirte their credit in my software 
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I'm looking for a way to trace changes in the status of DataGridBoolColumn.
(Checked, Unchecked...)
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