C# Discussion Boards - CodeProject

4-Feb-07 23:42

I need to develop an application, in C#.Net . I have two Touch panles connected to the system. My program have display different frames in different touch panels. Have anybody worked in such application? If so please tell me how to design it? How we can tell windows GDI to distinguish frames for different display?

Thanks
Bil

Colin Angus Mackay4-Feb-07 23:52

Colin Angus Mackay

4-Feb-07 23:52

When you have a multi-monitor setup the two monitors are seen as one continuous area. e.g. You have two monitors of 1024x768 each. The screen will be 2048 pixels wide. 0-1023 is on one monitor and 1024-2047 is on the other. So, telling GDI which monitor to display something on is just a matter of drawing at the appropriate coordinates.

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bil_geo5-Feb-07 0:41

5-Feb-07 0:41

Thanks Colin for your reply.

Your answer gives me some idea what to do.

I have some more questions to ask you.
Do we need to tell the windows that we are using 2 monitors. If so where we need to configure it?
If I am creating an application I have to create in such a way that it will cover up the the 2 monitors? Do c# allows to do so?
Is there any way we can configure GDI?

Thanks and Regards
Binil

Luc Pattyn5-Feb-07 1:09

5-Feb-07 1:09

Hi,

I once had a two-monitor system, and did some .NET work on it.

I remember you could move the relative positions of the monitors, and you could set both
monitors to different settings (e.g. bits per pixel).

So when shifted by 384 for instance, having two 1024*768 monitors could result in a desktop 2048 wide and 1152 high, with two rectangles of 1024*384 invisible.

You can extend a form to use whole or part of both monitors, simply drag as usual.

You dont have to tell GDI, just use the coordinates of this "extended desktop".

I think I also recall a form will maximize on the monitor that shows its top lefthand corner.

One of the monitors is the "primary monitor", you can choose which one.
The primary monitor is the one that displays boot progress, and shows the task bar.

FYI: programs such as screensavers most often ignore all but the primary monitor;
they should however handle all monitors, either with one big picture, or with multiple
pictures.

Hope this helps,

Smile | :)

Luc Pattyn

bil_geo5-Feb-07 1:28

5-Feb-07 1:28

Thanks for your reply Luc.

My requirement is little bit different. I have two touch panles in which I need to show two different frames. User can control the system from both the touch panels.
So an action in a touch panel is expected to reflect on the same touch panel only. It means there are logicaly 2 users using a same application.

Is there any way to design such a user interface program.

Thanks
Bil

Luc Pattyn5-Feb-07 1:39

5-Feb-07 1:39

Well, I guess there are many possibilities:

1. run two apps, each using part of the extended desktop, each part corresponding to
one touch panel.
2.run a single app that shows two modeless forms, one on each tp
3.run a single app that has a single borderless form encompassing both tp, and two
Panels, one for each tp.

The third one seems the easiest, whatever you choose you must dispatch input events
to the right app/form/panel, but that is not a GDI issue. GDI is taking care of the
graphical output.

I am not familiar with the touch side of touch panels, I expect it should behave much
like a mouse, with mouse down events etc.

I would go for 3. and create a TouchPanel class that extends from Panel and holds
whatever specific functionality you want to give it, including the touch event stuff.

If you know how to handle one touchpanel, the above should be sufficient to deal
with two of them.

Smile | :)

Luc Pattyn

bil_geo5-Feb-07 18:01

5-Feb-07 18:01

Thanks Luc.
That gives me better idea. Do we need any extra configuration in the GDI or display level , so that the display will be properly taken care and routed to different monitors. Do we need to write a display driver for it? Does windos XP embedded supports it?

Thanks
Bil

Change of OS [modified]

Luc Pattyn6-Feb-07 0:44

datetimepicker & short date

6-Feb-07 0:44

Hi,

I dont know the answers to those questions; I am unfamiliar with WinXP embedded.

Two thoughts:

- the people selling you the touchpanels should take care of whatever is required to
interface it properly to the Windows version you choose; and it must be in such a way
that it works under GDI+. (Remark: GDI+ is technology outside .NET, it started of as GDI,
.NET simply offers a wrapper on top of it).
If they dont offer this, it is the wrong vendor !

- you would also need confirmation that the multi-monitor behavior that I described
before (and applied to WinXP) also applies to your Windows version. This is primarily
a Windows matter, but then there is a posibility your touchpanel's driver might be incapable
of handling two panels or of running twice in parallel.

Smile | :)

-- modified at 8:34 Tuesday 6th February, 2007

Luc Pattyn

Glen Harvy4-Feb-07 23:35

Glen Harvy

4-Feb-07 23:35

Hi,

I wish to have the format of the date saved into my database as a short date format.

The MS Access DB field is configured for the datetime format.

Thanks,

Glen Harvy

Re: datetimepicker & short date

Christian Graus4-Feb-07 23:38

Christian Graus

4-Feb-07 23:38

You can't change the access database, or you don't want to ? How does this relate to the datetimepicker ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: datetimepicker & short date [modified]

Glen Harvy5-Feb-07 2:05

Glen Harvy

5-Feb-07 2:05

The text and value fields are bound to the database and are being saved to the db in the long format ie including the time.

I just don't want the time portion saved in the database field.

-- modified at 9:21 Monday 5th February, 2007

I think this is the only way :-

this.dtpMailInDateRcd.Value = this.dtpMailInDateRcd.Value.Date;<br />
this.dtpMailInDate.Value = this.dtpMailInDate.Value.Date;<br />
this.dtpMailInRepliedDate.Value = this.dtpMailInRepliedDate.Value.Date;

before I save the data.

Glen Harvy

Re: datetimepicker &amp; short date

Pratik Vasant Shah5-Feb-07 20:28

Pratik Vasant Shah

5-Feb-07 20:28

Hi,

I dont think even that might be a solution, since the value that you pass from your front-end is first parsed to the date format at the time of saving in the database. Hence, if the date format is "LONG" in your Access Database, then in that case, it will add time to the value passed from the front-end.

However, one solution could be that you change the format of the date (in the Design View) of the table to "mm/dd/yyyy" in the Format textBox in the General Tab and from the front -end you pass the value as
suggested by you in your previous thread.

this.dtpMailInDateRcd.Value = this.dtpMailInDateRcd.Value.Date;

This probably might help.

Thanking you in Advance

Regards
Pratik Shah

Collections and Datastructures

Kushi Bobby4-Feb-07 23:10

Kushi Bobby

4-Feb-07 23:10

HI guys
Please suggest me one good link for c# collections and to learn data structures in c# too.

Thanks alot

Bobby

Re: Collections and Datastructures

Stefan Troschuetz4-Feb-07 23:28

Stefan Troschuetz

4-Feb-07 23:28

MSDN is always a good starting point:
System.Collections Namespace[^]
System.Collections.Generic Namespace[^]

Exception Handling

Kushi Bobby4-Feb-07 23:04

Kushi Bobby

4-Feb-07 23:04

HI all,i had a query regarding Exception Handling.consider there r 30 webpages,which doesnt consists any type of Exception Handling techniques or code.as it is maintenance and enhancement project,how can i trace the errors and how to make it follow coding standards.
pls help me.

Thanks in advance
Bobby Smile | :)

Christian Graus4-Feb-07 23:07

Christian Graus

4-Feb-07 23:07

A good first step would be to write a base page class, which handles and logs unhandled exceptions, and make all pages derive from it. From there, you need to decide where exception handling is needed for specific cases, and add it.

Putting all code in try/catch(Exception) blocks is bad practice, you should add exception handling only for specific exceptions that you can anticipate and recover from.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Kushi Bobby4-Feb-07 23:15

Kushi Bobby

4-Feb-07 23:15

HI Graus

Thanks for ur fast reply.can u tell me some more detail how it handles and logs the exceptions.

pls spare me some little time

thanq Confused | :confused:

Christian Graus4-Feb-07 23:31

Christian Graus

4-Feb-07 23:31

Any code I write, at the top level, will just catch it, write it out to a log file ( the exception and the stack trace ), and then show an error ( if it's winforms ) and gracefully exit. But, that's the last stop, the place where stuff I don't want to happen, gets recorded so I can have some lead on how to never let it happen again.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

[C#] How to set Hook to capture the message which defind by user?

VirtualVoid.NET6-Feb-07 3:41

VirtualVoid.NET

6-Feb-07 3:41

try
{
// some code
}
catch (System.Exception ex)
{
MessageBox.Show(ex.ToString());
}

VirtualVoid.NET

huheng_0_04-Feb-07 22:59

huheng_0_0

4-Feb-07 22:59

If user RegisterWindowMessage()in app A, than send this message, how to set hook to capture this message in app B?
Confused | :confused:

Re: [C#] How to set Hook to capture the message which defind by user?

Luc Pattyn5-Feb-07 5:13

Re: [C#] How to set Hook to capture the message which defind by user?

5-Feb-07 5:13

A window can capture all messages it gets by overriding WndProc
for examples, just search "WndProc" on CodeProject.

Smile | :)

Luc Pattyn

huheng_0_05-Feb-07 13:52

huheng_0_0

5-Feb-07 13:52

But in A app, there is no form, that means i can't override WndProc or DefWndProc,so what can i do?
thanks Smile | :)

Re: [C#] How to set Hook to capture the message which defind by user?

Luc Pattyn5-Feb-07 14:09