C# Discussion Boards - CodeProject

Re: draw a single point

Stephane Rodriguez.23-Aug-02 4:14

Stephane Rodriguez.

23-Aug-02 4:14

I would suggest to spit on screen so you would get points on screens Big Grin | :-D

More seriously, there is no DrawPoint method available.

MS recommends to use GDI (Marshalled) which is still available.

Or, if performance is an issue, go unmanaged, lock a ptr on a surface and start playing with it.

Now AFAIK, I would recommend a simple to use FillEllipse(x,y,1*nZoomFactor,1*nZoomFactor) where nZoomFactor=1.

And I swallow a small raisin.

Re: draw a single point

Rüpel23-Aug-02 7:17

Rüpel

23-Aug-02 7:17

marshalled? unmanaged? wtf?! i only want to set a single pixel!!! Dead | X|

it seems, i will try the fillellipse-thing...

Hmmm | :|

but thx for the tip! Rose | [Rose]

:wq

Re: draw a single point

Stephane Rodriguez.23-Aug-02 7:37

Stephane Rodriguez.

23-Aug-02 7:37

Here is the code,

// -->declaration
[DllImport("gdi32.dll", CharSet=CharSet.Auto)]
static public extern int SetPixel(IntPtr hdc, int x, int y, int rgb); // 


// -->usage
// assumption : you have a HDC in hand
// cast your HDC to (IntPtr)
// cast your COLORREF to (int)
SetPixel(dc,x,y,rgb);

And I swallow a small raisin.

Re: draw a single point

Rüpel27-Aug-02 1:01

Rüpel

27-Aug-02 1:01

phew. that works. thx!

Rose | [Rose]

anyways - i still don't understand why ms doesn't include a DrawPoint(Pen,int,int) or DrawPoint(Pen,pt) function into the graphics-class.
Confused | :confused:

:wq

Re: draw a single point

Stephane Rodriguez.27-Aug-02 1:11

Stephane Rodriguez.

27-Aug-02 1:11

I guess for known performance reasons MS didn't think that was a good idea to allow DrawPoint. Well to be honest, the fact that DrawLine(x,y,x,y) does not work properly is a bug.
DirectX+GDI advocates have been fighting for years to train developers to lock a ptr to an actual surface, and then poking inside, instead of doing silly SetPixel loops. For real world apps such like real-time imaging, locking surfaces is of course the recommended solution,

And I swallow a small raisin.

Re: draw a single point

Rüpel27-Aug-02 3:37

Rüpel

27-Aug-02 3:37

hmm. might be a reason. when i think it over, i could have created a bitmap before the operation, set the pixels within the bitmap and draw the bitmap at the proper location...

i see there's a trade-off between 'amount of code' and 'drawing speed' - but in my simple case the setpixel-speed is abolutely ok. Smile | :)

:wq

Re: draw a single point

Rüpel26-Aug-02 22:01

Rüpel

26-Aug-02 22:01

FillEllipse(,,,1,1) does not solve the problem Frown | :(

going marshalled... Unsure | :~

:wq

Re: draw a single point

Rüpel26-Aug-02 22:06

Rüpel

26-Aug-02 22:06

MS recommends to use GDI (Marshalled)

where do you know that from? how does someone get to know what MS recommends...?

:wq

Re: draw a single point

Philip Fitzsimons23-Aug-02 4:21

Philip Fitzsimons

23-Aug-02 4:21

SetPixel

"When the only tool you have is a hammer, a sore thumb you will have."

Re: draw a single point

Rüpel23-Aug-02 7:34

Rüpel

23-Aug-02 7:34

i don't want to draw on a bitmap but rather on a graphics-object

:wq

Exception in NEt application on W98

EdgarBM23-Aug-02 0:57

EdgarBM

23-Aug-02 0:57

Hi,
I've developped a little application to communicate by serial ports in .NET. It uses Kernel32 API the same way the communication was done on VC++ 6.0.
When I had finished it I copied it to a W98 computer with the .NET Framework already installed. The problem is that I get an exception just when I try to execute it and nothing works (neither the form is shown, only the error message).
I tried it on another W2k and gets an exception on "unknown module" about a "invalid URL direction".

Does anyone knows what's happening?, maybe I should make an installation project for it?

Thanks in advance,
EdgarBM

Edgar Berengena Moreno
Software Engineer
Appeyron Research

Re: Exception in NEt application on W98

David Stone23-Aug-02 6:56

David Stone

23-Aug-02 6:56

Is the program relying on a dll that isn't included in the .NET Framework? That could be the problem.

David Stone

It seemed similar to someone saying, "Would you like to meet my knife collection?"
Ryan Johnston on Elaine's sig

Re: Exception in NEt application on W98

EdgarBM25-Aug-02 21:44

EdgarBM

25-Aug-02 21:44

Hi,
thank you for your reply.

I'm using API "Kernel32" the functions:

WriteFile
ReadFile
GetLastError
CloseHandle
CreateEvent
SetCommTimeouts
GetOverlappedResult
WaitForSingleObject

...but I realized that if I execute the program locally (note remotelly) it executes, although it doesn't works fine because those functions doesn't work.
Do you have any idea about it?

Thank you again,
Edgar

Edgar Berengena Moreno
Software Engineer
Appeyron Research

DirectX

Philip Fitzsimons22-Aug-02 23:01

Philip Fitzsimons

22-Aug-02 23:01

anyone tried using directX from c#?
I know that the next version will be .net compatible, but I am wondering if its been tried with the current version - maybe with the vb version of the directx lib?

"When the only tool you have is a hammer, a sore thumb you will have."

Re: DirectX

Rüpel23-Aug-02 2:36

Rüpel

23-Aug-02 2:36

have a look at this article here on codeproject in the C#-section

it's about writing a media-player in C# using DirectShow, and as far as i understood (never ever having written a single line of vb-code) it does use the vb-libs

:wq

.Net framework source code

Stephane Rodriguez.22-Aug-02 22:36

Stephane Rodriguez.

22-Aug-02 22:36

Couldn't believe my Unsure | :~

eyes

when I ran it the first time, but this program decompiles the whole .Net framework IL source code,

And I swallow a small raisin.

Re: .Net framework source code

leppie23-Aug-02 3:26

leppie

23-Aug-02 3:26

Yes, its nice, but it does crash alot Frown | :(

If u want some more source code, download the MONO source, also very helpfull especially when u want to extend .Net classes. Smile | :)

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Re: .Net framework source code

Stephane Rodriguez.23-Aug-02 4:00

Stephane Rodriguez.

23-Aug-02 4:00

I thought at first sight that Mono was really far from a user-friendly repository of .Net source code, but... Confused | :confused:

While we are at it, let's check out Salamander. I hate their Java demo but their desktop app looks fine and powerful too.

Within a few hours so many tools to hack down the closed code. I thought until this morning that switching from MFC to C# I was being ligotated by MS. Now no more. Let it begin! Cool | :cool:

And I swallow a small raisin.

Re: .Net framework source code

James T. Johnson23-Aug-02 4:37

James T. Johnson

23-Aug-02 4:37

Amazing isn't it? Big Grin | :-D

To cover the places where it crashes, ildasm does the job nicely for me.

James
"And we are all men; apart from the females." - Colin Davies

Re: .Net framework source code

Stephane Rodriguez.23-Aug-02 4:40

Stephane Rodriguez.

23-Aug-02 4:40

Eh...eh.... Cool | :cool:

Not a single crash for me. Used since 8 AM this morning (it is 16 PM).

And I swallow a small raisin.

Re: .Net framework source code

James T. Johnson23-Aug-02 4:42

James T. Johnson

23-Aug-02 4:42

I've only found a few methods that crash it for me. One of the paint event methods seemed to do it, PaintWithErrorHandling in the Control class IIRC.

James
"And we are all men; apart from the females." - Colin Davies

Re: .Net framework source code

leppie23-Aug-02 5:01

leppie

23-Aug-02 5:01

maybe I just try to view the wrong stuff Smile | :)

Try some dll's with a combination of unmanaged/managed code and it tends to crash on some functions.

But I'll take James's sugestion and use IDLDASM Smile | :)

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Re: .Net framework source code

Stephane Rodriguez.23-Aug-02 5:49

Stephane Rodriguez.

23-Aug-02 5:49

Well huhaaaaa WTF | :WTF:

Crashed too!

Will try recompile and debug Anaconda this WE or something. Will flag you if I get this bug down,

And I swallow a small raisin.

Re: .Net framework source code

Stephane Rodriguez.24-Aug-02 6:59

Stephane Rodriguez.

24-Aug-02 6:59

I have tried to recompile Anakrino this WE, but a few main files and projects are missing from the source repository. Thus I and you will have to live with the GPF,

And I swallow a small raisin.

OwnerDraw TreeView

Nnamdi Onyeyiri22-Aug-02 21:34

Nnamdi Onyeyiri

22-Aug-02 21:34

Which methods do i need to override to put myown drawing code in a tree view, for when it is drawing the nodes?

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

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