Crovax

Im trying to make a program that runs in the back and when i hit a key it use GetPixel to get the RGB value from a pixel on the screen.

It lookings like this:

Dim hDCDesk As Long
Dim ReturnCol As Long

hDCDesk = GetDC(0)
ReturnCol = GetPixel(hDCDesk, x, y)

then i use

Debug.Print ReturnCol

so I can see the RBG value. This works fine.

The problem is when i start the program i look at a pixel and get its RGB value, later i look at the same pixel and i know that the RGB value have changed but when i look at the value its the same as the first one. I dont know what im doning wrong so i hope someone can help me with this or point me in some direction where i can get some info about this.

PS. Hope u can read and understand my bad english DS.

Legend

There is nothing wrong with your english!!

I think what you actually need to do is use an API call to get the handle to the window under the mousepointer (WindowFromPoint????). You then proceed as you have written.

I think that all your code is doing is getting the RGB for the point on the desktop - not from any window on top of the desktop.

Crovax

Im try to spell as good as i can


Ah, So GetDC(0) dont get the dc to the screen? only the
desktop?

So all i have been doing is looking at the same pixel thats
in my desktoppic

Thx for the help i will look into the WindowFromPoint????? API

Legend

Crovax,

The function: GetCursorPos

Can be used to convert the mouse position to the screen position.

You can then use WindowFromPoint to get the handle to the window under the mouse:

Crovax

k, i will take a look at it and see how it works out

thx again for the help