How to get the color of the specified pixel in the screen?

[Hooyoo]

I want to get the color of the specified pixel in the screen.
Firstly I get the position of the cursor:
//Get the position of cursor.
Point position = Cursor.Position ;

Next I want to get the color using the position of the cursor.
Anybody here can show me some demo codes?

Thanks.

[Michael Nemtsev]

Hello Hooyoo,

Use GetPixel method of WinAPI.
Sample is there http://pinvoke.net/default.aspx/gdi32/GetPixel.html

HI want to get the color of the specified pixel in the screen.
HFirstly I get the position of the cursor:
H//Get the position of cursor.
HPoint position = Cursor.Position ;
HNext I want to get the color using the position of the cursor.
HAnybody here can show me some demo codes?
H>
HThanks.
H>
---
WBR,
Michael Nemtsev [C# MVP] :: blog: http://spaces.live.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

[Lucian Wischik]

Michael Nemtsev <ne*****@msn.co mwrote:

>Use GetPixel method of WinAPI.
Sample is there http://pinvoke.net/default.aspx/gdi32/GetPixel.html

Looking at that page, I think it has a leak. It should
ReleaseDC(hwnd, hdc) the hdc that it acquired.
Ah, it's a wiki. I guess I'll go and change it.

--
Lucian

[Peter Duniho]

"Hooyoo" <zh*********@12 6.comwrote in message
news:11******** **************@ 16g2000cwy.goog legroups.com...

>I want to get the color of the specified pixel in the screen.
Firstly I get the position of the cursor:
//Get the position of cursor.
Point position = Cursor.Position ;

Next I want to get the color using the position of the cursor.
Anybody here can show me some demo codes?

In addition to what Michael wrote (I'm assuming there's no practical way to
get a Graphics object representing the screen DC in .NET)...

Keep in mind that reading from the video card frame buffer is slow, at least
with AGP cards. So hopefully you don't need to get the pixel's color very
frequently.

Also keep in mind that when an application is using an overlay buffer
(pretty common with video media players, not very common with anything
else), getting the color of a pixel within the overlay will not get the
actual color being displayed there. It will usually be black, but if not it
will be some other default color rather than the pixel you're actually
seeing.

Pete

[Hooyoo]

Thank you, Michael.
But actually I don't like use API in C#, I think it makes ungraceful
codes.
So hopefully there are some methonds of .Net Class Libraries can
implement that.
Michael Nemtsev wrote:

Hello Hooyoo,

Use GetPixel method of WinAPI.
Sample is there http://pinvoke.net/default.aspx/gdi32/GetPixel.html

HI want to get the color of the specified pixel in the screen.
HFirstly I get the position of the cursor:
H//Get the position of cursor.
HPoint position = Cursor.Position ;
HNext I want to get the color using the position of the cursor.
HAnybody here can show me some demo codes?
H>
HThanks.
H>
---
WBR,
Michael Nemtsev [C# MVP] :: blog: http://spaces.live.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

"Hooyoo" <zh*********@12 6.comwrote in message
news:11******** *************@n 67g2000cwd.goog legroups.com...

Thank you, Michael.
But actually I don't like use API in C#, I think it makes ungraceful
codes.
So hopefully there are some methonds of .Net Class Libraries can
implement that.

Unfortunately you will have to use it, there is nothing in the framework for
doing what you want. it's after all platform dependand.

There is nothing wrong in using the win API you know
--
Ignacio Machin
machin AT laceupsolutions com

[Hooyoo]

Thanks, got it.
"Ignacio Machin ( .NET/ C# MVP ) дµÀ£º
"

Hi,

"Hooyoo" <zh*********@12 6.comwrote in message
news:11******** *************@n 67g2000cwd.goog legroups.com...

Thank you, Michael.
But actually I don't like use API in C#, I think it makes ungraceful
codes.
So hopefully there are some methonds of .Net Class Libraries can
implement that.

Unfortunately you will have to use it, there is nothing in the framework for
doing what you want. it's after all platform dependand.

There is nothing wrong in using the win API you know
--
Ignacio Machin
machin AT laceupsolutions com