ASP.NET Discussion Boards

ActiveX Control that Communicates with Client Side Devices

Broken Bokken6-Jun-08 7:01

6-Jun-08 7:01

I'm trying to interface a barcode scanner and a website using activeX. I have code that will read the barcode, but my issue is developing an activeX control that will run on the client machine to pick up input from the barcode scanner device. I am having trouble finding much on activeX control creation, let alone interfacing my activeX control with a device on the client machine.

If it isn't possible for the control itself to interface with the client side device, then is it possible to wite a C# windows app that the active X control installs on the client machine and then communicates with?

Thanks

Broken Bokken

You can't carry out a ninja-style assasination dressed as an astronaut. It's the luminous fabric; too visible. - Tripod

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Re: ActiveX Control that Communicates with Client Side Devices

led mike6-Jun-08 10:40

led mike

6-Jun-08 10:40

Broken Bokken wrote:
I am having trouble finding much on activeX control creation

Try searching for COM Server[^] rather than activeX

Broken Bokken wrote:
let alone interfacing my activeX control with a device on the client machine.

If your code works then it works. If you make it part of a COM Server it will still work, the COM Server part just uses a specific way for the hosting application to interface with your code. That said there are possibly security issues when your COM Server is hosted in a browser that you might have to deal with. Again that is an entirely separate issue from the other two.

led mike

Transparent layer on web page

MPR20066-Jun-08 7:00

MPR2006

6-Jun-08 7:00

Hi

I would like to know how to show a transparent layer on a web page. The transparent layer should allow web controls to be placed and the data should be available to be submitted. Once the form in the transparent layer is submitted, the underlying web page should become active.

Can someone help?

Thanks in Advance.

MPR2006

Re: Transparent layer on web page

eggsovereasy6-Jun-08 7:20

eggsovereasy

6-Jun-08 7:20

You can use panels and set them visible or invisible as needed.

Or a MultiView

Re: Transparent layer on web page

MPR20066-Jun-08 8:10

MPR2006

6-Jun-08 8:10

Hi,
Thanks for the reply. Do you have a sample of how this can be used? Is it possible to do this through Javascript?

Registering java script after page post back

alok_2k36-Jun-08 6:16

alok_2k3

6-Jun-08 6:16

Hi,

I have a web form on which there is a register button.Now i want to fire a java script method after the post back of the page when the button click occurs.

Please help me.

Thanks in Advance
Alok...

Re: Registering java script after page post back

Parwej Ahamad6-Jun-08 6:23

Parwej Ahamad

6-Jun-08 6:23

You can do it as below:

On button click event (Server side) use

Response.write("javascrpt");

Parwej Ahamad
R & D with IIS 5.0/6.0

Converting a integer value of 0 to empty string when binding to a DataGrid

Steve Holdorf6-Jun-08 5:22

Steve Holdorf

6-Jun-08 5:22

I am binding a generic list of products List<products> to an ASP DataGrid and was wondering what the best way to convert the Product object integer values of 0 to an empty string when binding to the grid. See, the Product object contains integer properties and when reading from the database if the value read is DBNull I assign a value of 0 to the property. Now, when displaying the List<products> using databinding I want the 0 to show as empty strings in their columns. What do you recommend?

Thanks,

Steve

Re: Converting a integer value of 0 to empty string when binding to a DataGrid

Christian Graus6-Jun-08 5:25

Christian Graus

6-Jun-08 5:25

I would recommend a string property you bind to, that returns an empty string if it's 0. Or use int? and then use ?? to return an empty string, perhaps ?

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: Converting a integer value of 0 to empty string when binding to a DataGrid

Steve Holdorf6-Jun-08 6:00

Steve Holdorf

6-Jun-08 6:00

Using a second property for binding sounds like the way to go. Smile | :)

Thanks for your help!!!!!!!!!

Steve

Re: Converting a integer value of 0 to empty string when binding to a DataGrid

eggsovereasy6-Jun-08 7:23

eggsovereasy

6-Jun-08 7:23

string val = string.Empty;
if (yourInteger != 0)
  val = yourInteger.ToString();

Maybe I don't understand the question...

Re: Converting a integer value of 0 to empty string when binding to a DataGrid

Christian Graus6-Jun-08 16:33

Christian Graus

6-Jun-08 16:33

He wants to write binding statements in his aspx. He COULD do this, but it's messy

Printing to non default printer from ASP.NET Page [modified]

Steve Messer6-Jun-08 5:19

Steve Messer

6-Jun-08 5:19

I am trying to print to a receipt printer during our payment process.

The printer is not the default printer and I can't change that.

The problem is that from the browser you don't have permission to programatically get
a list of printers and select which one you want. So, currently we pop up the Print dialog
then select the desired printer and then click ok. This is two steps too many.

How can you get around this limitation and automate the printing of the receipt?

modified on Friday, June 6, 2008 11:29 AM

Re: Printing to non default print from ASP.NET Page

Christian Graus6-Jun-08 5:24

Christian Graus

6-Jun-08 5:24

No, you cannot. As you said, in javascript, you can kick off the printing process, but you can't interact with it.

Re: Printing to non default print from ASP.NET Page

Steve Messer6-Jun-08 5:31

Steve Messer

6-Jun-08 5:31

So, I guess we could create a client side windows web service which accepts the html and then have the web page post to it and then it could do the printing.

Re: Printing to non default print from ASP.NET Page

Christian Graus6-Jun-08 5:55

Christian Graus

6-Jun-08 5:55

Well, a client side app that calls a web service, yes, that would work. Or an ActiveX control perhaps.

Re: Printing to non default print from ASP.NET Page

Steve Messer6-Jun-08 5:58

Steve Messer

6-Jun-08 5:58

Yes, I didn't what to do an ActiveX control but either way it is a client side solution.

thanks for your input.

Re: Printing to non default print from ASP.NET Page

Vasudevan Deepak Kumar6-Jun-08 5:30

Vasudevan Deepak Kumar

6-Jun-08 5:30

The default JavaScript does not have the privileges of choosing a printer. You may need an ActiveX Solution to do that. Check out ScriptX, the basic version of which is free. I also have a small review of the same over here:

http://www.dotnetspider.com/resources/3147-Software-Review-Granular-Print-Control-wi-Inte.aspx[^]

Vasudevan Deepak Kumar
Personal Homepage
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And all the men and women merely players.
They have their exits and their entrances;
And one man in his time plays many parts... --William Shakespeare

ASP.NET content control problem in Master page architecture

Faisal Khatri6-Jun-08 5:07

Faisal Khatri

6-Jun-08 5:07

Hi all
I am using ASP.NET 3.0 and I have a list box in content page. I am using Master Page architecture. I am binding data from the database into the listbox. but it gives me error of "object reference not set to an instance of an object". This is what I am doing..

((ListBox)(this.FindControl("ctl00_ContentPlaceHolder1_lMondayFD1"))).DataSource = ds.Tables[0].DefaultView;

Please guys any one can help me

Re: ASP.NET content control problem in Master page architecture

Parwej Ahamad6-Jun-08 5:50

Parwej Ahamad

6-Jun-08 5:50

Are you able to find other controls at the same place ?

OR can you try like below :
Note: Be sure if your Listbox control defined in Content Place holder

ContentPlaceHolder mpContentPlaceHolder;
    ListBox lb;
    mpContentPlaceHolder =    (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
    if(mpContentPlaceHolder != null)
    {
        lb=(ListBox ) mpContentPlaceHolder.FindControl("yourListboxid");
        if(lb!= null)
        {
            lb.DataSource = ds.Tables[0].DefaultView;
        }
    }

OR In case List box placed on Master page then use try like this:

ListBox lb = (ListBox ) Master.FindControl("yourListboxid");
 if(lb!= null)
 {
      lb.DataSource = ds.Tables[0].DefaultView;
 }

Parwej Ahamad
R & D with IIS 5.0/6.0

modified on Friday, June 6, 2008 11:59 AM

Z-index problem in a control in a Panel using ModalPopupExtender

ednrg6-Jun-08 3:52

ednrg

6-Jun-08 3:52

Background:
We are using .NET 2.0 with the MS Ajax Extensions and the Ajax Toolkit. I'm using the Ajax ModalPopupExtender extender control to create modal popups on a page. I am using a custom datepicker control that uses javascript to pop up a calendar, and populates the textbox with the date selected.

Problem:
It seems that Javascript gets confused with the z-index of the popup. When used on a non-ajax popup panel, it works flawlessly. But, when it is placed on a modal popup panel, the javascript popup calendar is shown behind the modal form. Since the main form and the panel that is controlled by the modal popup are essentially the same form, the control cannot distinguish that its z-index should be set differently.

Failures:
I've tried moving the panel to the beginning of the page.
I've tried setting the z-index of the page to a high number
I've tried setting the z-index of the panel to 0 and 1
I've rechecked the code to verify it is not setting the z-index internally.

Any help on finding a solution to this problem would be greatly appreciated.

Re: Z-index problem in a control in a Panel using ModalPopupExtender

Member 20303346-Jun-08 4:43

Member 2030334

6-Jun-08 4:43

try to put an iframe under your custom calendar.

How can an Applet communicate with the exact page it was loaded from

xax6-Jun-08 3:49

xax

6-Jun-08 3:49

I'm looking for a way to make an applet communicate with the same aspx page it was loaded from and not a new one. Using the http protocol I'm able to connect the applet to the aspx, but it is a different one and I need to be the same since every aspx contains diferent information (data members).

cant connect to database

eyeseetee6-Jun-08 3:37

eyeseetee

6-Jun-08 3:37

Hi
Im trying to connect to sql server database through asp.net
The connection string works when connecting through access front end
But it doesnt work when connecting through .net, it says the credentials are not correct
any help would be great
thanks

We are not a Code Charity

Re: cant connect to database

Colin Angus Mackay6-Jun-08 4:34

Colin Angus Mackay

6-Jun-08 4:34

If you are using a trusted connected then you have to remember that your ASP.NET application runs as a different user to you. So, when you connect using the wizard in Visual Studio you are using your credentials. When your applications runs then it is using the credentials of the ASP.NET process (normally NT AUTHORITY/NETWORK SERVICE). You have to give permission to that account in your SQL Server.

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