reading color of pixel

Ok, Im looking to get the pixel color of a certain pixel, but i dont understand the first parameter or GetPixel();
http://msdn.microsoft.com/en-us/library/ms532282.aspx

I dont know what to do for the HDC(i dont even know what HDC is).

A HDC is a Handle for a Display Context. You can get one with a CreateDC() or GetDC() - depending on what you are actually trying to do.

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Mats

i just want to get the color of a pixel on screen. Ill Go check it out, thanks.

Quote:

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Originally Posted by wannabe723

i just want to get the color of a pixel on screen. Ill Go check it out, thanks.

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Yes, I understand that's what you say you want to do. But there's a difference between reading a pixel belonging to a particular window or reading the entire screen, for example.

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Mats

Well,i read a whole bunch on the msdn site, i cant find it out at all... im gonna try to find some other way i guess

So, if you explain what you want to do (with a bit more detail than "I want to read a pixel"). For example, would it be sufficient to read pixels from the entire screen (as in, do you know where on the screen your pixels are)?

If so,

Code:

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HDC hdc = GetDC(NULL);
GetPixel(hdc, ...);

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should do the trick.

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Mats

I tried using HDC, my compiler didnt recognize it, so there must be something wrong with the registers. I found out how to do it in pascal anyway,

Code:

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program ColorFinder;

var color,x,y: integer;

procedure findcolor;
begin
    GetMousePos(x,y);
    color:=GetColor(x,y);
    writeln('color='+ IntToStr(color));
end;
begin
    findcolor;
end.

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For Some reason, CTRL+ALT+R isnt making the program run, so i can only get the color of the start icon on the compiler

I have absolutely no idea what CTRL-ALT-R is supposed to do here. Perhaps you can post your C++ attempt?

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Mats

Lolz, when i go to the run part on my pascal compiler it says CTRL+ALT+R should make it run. Oh well.... I have alot of different attempts, I know they where all wrong. Pascal is a much easier language than C, I might learn C a bit later in my career, but im just going to stick to pascal for now.

EDIT: I changed the hotkey to CTRL+ALT+B and now it works, lolz, thats wierd.

EDIT: I have enchanced my code so that is now prints:
Color=whatevercolor(x,y)

Code:

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program ColorFinder;

var color,x,y : integer;
    z,a,b: string;

procedure findcolor;
begin
    z:= '(';
    a:= ',';
    b:= ')';
    GetMousePos(x,y);
    color:=GetColor(x,y);
    writeln('color = '+IntToStr(color)+(z)+IntToStr(x)+(a)+IntToStr(y)+(b));
end;
begin
    findcolor;
end.

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