C# Discussion Boards - CodeProject

leppie1-Aug-04 12:09

leppie

1-Aug-04 12:09

Colin Angus Mackay wrote:
I tried, but at 1 cm, no reaction. So I tried hovering the stylus at about half a centimetre but still nothing.

You mean your stylus actually hovered? Mine just fell and hit the button, but it didnt repsond Poke tongue | ;-P

^{top secret xacc-ide 0.0.1}

Re: ToolTip Control in pocket pc.

Colin Angus Mackay1-Aug-04 13:52

Colin Angus Mackay

1-Aug-04 13:52

leppie wrote:
You mean your stylus actually hovered?

Muggles! Roll eyes | :rolleyes:

"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

Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!

Re: ToolTip Control in pocket pc.

Roman Rodov1-Aug-04 14:17

Roman Rodov

1-Aug-04 14:17

Well Pocket Word for example supports tooltips. To bring up a tooltip I think you Tap-and-Hold the button. It should not bring up the Tap-and-Hold menu but instead it brings up a tooltip.

Re: ToolTip Control in pocket pc.

Colin Angus Mackay1-Aug-04 22:20

Colin Angus Mackay

1-Aug-04 22:20

I have just looked at a collegue's PocketPC 2003 and I've seen that Word does indeed support tooltips (in that version, I can't confirm other versions at the moment). However, that still does not alter the fact that the .NET Compact Framework does not support tooltips. For example, if you look at the ToolBarControl you will see that the ToolTipText property is not "supported by the .NET Compact Framework". You may be able to find some way to interop with the relevant controls however.

As a side note, until your suggestion above, it never occurred to me to even try as the user-interface is not conducive to supporting tooltips in a sensible manner (IMO). The tap-and-hold technique would undoubtedly confuse many who would expect a menu to pop-up.

MS Query in Excel 2000 From C#

Heroz1-Aug-04 5:07

Heroz

1-Aug-04 5:07

Hello all!
I have 2 DBA files. I want to make 1 excel table from them by a query(excel can convert those files automatically when I open them).
I haven't found how I could run MS Query in Excel from C#, is there a way?

MS Visual Studio.NET 2003
C#

How useful is are Windows.Forms?

Anonymous1-Aug-04 3:42

Anonymous

1-Aug-04 3:42

Well, how fast are Windows.Forms currently (especially on older machines >1GHz)? I'm asking this question because I want to know if Windows.Forms and GDI+ are suitable for a complicated drawing program similar to Autocad or Maya.

And there is an alternative I guess but not as portable as GDI+ and Windows.Forms I guess: Managed DirectX and eventually OpenGL wrappers.

I need an advice. Can I count on .NET to create an useful relatively complicated 2D/3D drawing application or not?

Thank you!

Re: How useful is are Windows.Forms?

Dave Kreskowiak1-Aug-04 4:23

Dave Kreskowiak

1-Aug-04 4:23

Anonymous wrote:
Can I count on .NET to create an useful relatively complicated 2D/3D drawing application or not?

Yes you can. How complicated and easy it is depends on your implementation of the drawing surface. For ACAD or Maya level support, GDI+ is way too limited. You'll have to write your own classes to handle the drawing surface interface. Don't start with GDI+ and "upgrade" to OpenGL later. Start from the beginning with the display package your going to do, otherwise you're going to be rewritting HUGE parts of your code.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: How useful is are Windows.Forms?

Daniel Turini1-Aug-04 5:58

Daniel Turini

1-Aug-04 5:58

GDI+ is not hardware accelerated (although I heard that some Radeon and Matrox cards do accelerate GDI+).
This means that all the burden of drawing will be on the CPU. Since you're mentioning that the machines will be older, this means that the drawing will be slower, and you'll only be able to significantly speed it up by changing the whole machine (mobo, processor and memory). It's hard to get this upgrade for under $250, and this will only get your drawing 2x or 3x faster.
Managed DirectX is supported by MS and will use all hardware capabilities avaliable. If not available, it'll be emulated (and quickly) by the main CPU. If the user needs to upgrade, he/she can simply buy an el-cheapo $50 NVidia GeForce4 MX 440 and the drawing will get up to 20x faster. If the user chooses a $250 card, it may get up to 60x faster when compared to a pure main CPU drawing on an old machine.
I don't like OpenGL wrappers, both because they're not supported by MS, and because in my past experience, OpenGL showed to be way slower and limited when it depended on emulation.
Remember also that you'll have to deal with the whole 3D drawing if you choose GDI+. Both DirectX and OpenGL are more like scene descriptions and the drawing is done by the back end.
The .NET environment will add a bit of overhead over anything you choose when compared to native C++, but it'll probably go unnoticed (tipically 5%~10% plus a slower startup time).

Yes, even I am blogging now!

Re: How useful is are Windows.Forms?

Anonymous1-Aug-04 6:26

Anonymous

1-Aug-04 6:26

Thank you and the other poster!

By saying: AUTOCAD I don't mean I want to compete with Autocad and implement all features it supports but most of the graphics functions like: drawing arcs, line, polylines in 2D/3D, trimming, extending etc and I'm not talking about Autolisp, etc.

I'm asking this because eventually if someday Mono supports Windows.Forms and GDI+ properly I would like to be able to run this program on other OSs too.

Of course Managed DirectX is the better alternative for Windows.

The only really complex Windows.Forms program I've ever used is: #Develop and it isn't an example for a fast running application. That's why am asking this question.

How to print any type of file to printer

khurram rathor1-Aug-04 3:16

khurram rathor

1-Aug-04 3:16

Hello everyone,

I'm trying to make an application that will select any file like .doc, .txt, .excel, .pdf and etc and the file will be printed to printer.

If anyone can give me the idea about that. I will appreciate.

Blush | :O

khurram rathor

Re: How to print any type of file to printer

Dave Kreskowiak1-Aug-04 4:25

Dave Kreskowiak

1-Aug-04 4:25

It's already been done and it's called Windows Explorer. Right click on any file and click Print. It's what your going to be using anyway. You can't possibly add support for every file type and every version of each file type to your app to print it correctly. You'll just end up shelling out the job to the app that is associated to the file and it will do the printing.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: How to print any type of file to printer

Tim DuBois1-Aug-04 16:47

Tim DuBois

1-Aug-04 16:47

I wouldn't mind doing something similar, but only for word and publisher files. Can you tell us how to use the shell to talk to these programs? Or would that be program independant?

Re: How to print any type of file to printer

Dave Kreskowiak1-Aug-04 16:56

Dave Kreskowiak

1-Aug-04 16:56

Word and Excel use DDE (not support by the .NET BCL) to let the Shell tell Word or Excel what to do with the file. It's easy enough to see the commands. ALl you have to do is open Explorer, go to Folder Options/File Type and find the DOC type. Click on it and then click Advanced at the bottom of the window. You'll find the Print and PrintTo commands there plus the command line to launch Word and the DDE commands to send to it to get it to print the doc.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Cursor problem?!?

QzRz1-Aug-04 1:58

QzRz

1-Aug-04 1:58

Hi...

Is it possible to move the cursor to center of the screen when my app is loading?

and if it is....can someone please tell me how to do it?

I have thought about to use the Draw method... But i dont know how to use it Frown | :(

QzRz

Re: Cursor problem?!?

Stefan Troschuetz1-Aug-04 2:22

Stefan Troschuetz

1-Aug-04 2:22

You can set the position of your cursor by using the System.Windows.Forms.Cursor.Position property. The following code should center it on the screen.

using System.Drawing;
using System.Windows.Forms;

Cursor.Position = new Point(SystemInformation.WorkingArea.Width / 2, SystemInformation.WorkingArea.Height / 2);

www.troschuetz.de

Re: Cursor problem?!?

QzRz1-Aug-04 2:31

QzRz

1-Aug-04 2:31

Thanks... it works! Smile | :)

QzRz

Re: Cursor problem?!?

ted f.a. van gaalen7-Aug-04 1:44

ted f.a. van gaalen

7-Aug-04 1:44

Hi,
Please consider that there are many
users that have graphical tablets/pen
as pointing devices instead of/in parallel with
a mouse. (i have a Genius tablet)
Your method is in that case instantly overriden by the
next pen position event (which occur at a rate
of > 100-1000 times/sec), therefore:

For these devices it is always the absolute position
of the pen where the cursor will be, no matter where
your program puts it.
This also is the case of course for Tablet- and Pocket PC's

IMHO, moving the cursor programatically is not very user
friendly, because if you move it out of the area where the
attention is, the user then has to look where it is.
It's like taking control away from the user

Mouse drives often have a feature to move the cursor
to the default dialog button. I always disable this.

Regards Big Grin | :-D

Ted

Sound level on sound card input

alldates1-Aug-04 0:35

alldates

1-Aug-04 0:35

How to measure sound level on sound card input in decibel? I need to write a program in C#, which alert when the sound level is less the threshold (n db).

Re: Sound level on sound card input

Dave Kreskowiak1-Aug-04 4:31

Dave Kreskowiak

1-Aug-04 4:31

It's not possible to do because the sound cards do not support input based on decibels. You would need to set the levels on the the Microphone to known values, and keep them there, then you would need a calibration device that measures decibels and a source of calibrated sound to know at what levels the Microphone is hearing the sound. Once you have the input levels mapped to known decibel values, then you can just monitor the mic for known decibel levels of sound.

Someone asked this very same question about a month or two ago...

Hmmm....

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Sound level on sound card input

alldates1-Aug-04 5:02

alldates

1-Aug-04 5:02

But how programs like SoundForge, Adobe Audition (CoolEdit) or any other audio programs show the level in db of the sound without any Microphone or calibration?

> Someone asked this very same question about a month or two ago...

I try to found in this board messages about this problem? but i found nothing.

Many years ago i create such ptogram on pascal under dos. But now i need to write it on C# under Windows. I can't find any docs about this theme.

Re: Sound level on sound card input

Dave Kreskowiak1-Aug-04 16:51

Dave Kreskowiak

1-Aug-04 16:51

That's because you're under the impression that "decibel" is a measure of the loudness of a sound. It's not. It's a measure of relative signal strength. Those programs are showing you the decibel power of a small sample of a signal relative to itself, or the signal strength around the sample. There is absolutely no way a sound card can tell you what the decibel power of a sound is because it has no reference to compare it to.

Don't bother searching for the answer to the previous question. It's the same as this one.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Help in Grid Control

murali_utr31-Jul-04 19:49

murali_utr

31-Jul-04 19:49

Hi,
For my application i need grid control having future of typing data in grid cells. like billing. any suggestion or any samples send to me. make cc to murali_utr@vsnl.net

thanks in advance!!!!!!!!!!!

Have A Nice Day!
Murali.M

Re: Help in Grid Control

DougW481-Aug-04 17:08

DougW48

1-Aug-04 17:08

I have written a billing system using the dataGrid control. Let me know exactly what you are looking for and I might be able to help you out. But please, keep it in the forum instead of private e-Mails, as it may help others as well.

Re: Help in Grid Control

murali_utr2-Aug-04 5:03

murali_utr

2-Aug-04 5:03

hi,
thanks for ur reply. in case of DataGrid is faced some problems in vb 6.0. so afraid about datagrid then only searching any other control. I don't know how this working on C#.Net. How u feel datagrid in ur project. it's ok to do?
Have A Nice Day!
Murali.M

Re: Help in Grid Control

DougW482-Aug-04 13:58

DougW48

2-Aug-04 13:58

The .Net datagrid seems to be very stable and easy to use. I wouldn't hesitate to include it in your form. The simplest method I have found for using the datagrid for this type of project is once you have an invoice or order ID, you bind your datagrid to a dataset with "items" that are being purchased. Each of these items has a column for Invoice/Order ID as well.

I think if you use the datagrid, you'll be happy with your choice. For a project such as this, there are a few details you have to keep in mind, such as calculating line totals from the price and quantity. If you need help with things like this, just keep replying in this post, or start another one...I don't respond much, but I read the questions on codeproject almost every day!

- D

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