Various programs running on the desktop, there are many very beautiful colors, we may want to use their color, but unfortunately there were no source, it is difficult to know exactly their R, G, B color value. So we have a lot of screen color pick tool, you want to know how they use the program to achieve the What? Here I use VC6.0 to do I took a screen color picker example of code to tell you that after running an instance of the interface is as follows:
Basic component ideas:
The principle is very simple and requires only a brief three-step. Both: get the screen DC, get the current mouse location in pixels, a pixel value decomposition of the red, green and blue can, it is easy now!
Key code:
1, access to the screen DC
HDC hDC =:: GetDC (NULL); file / / get the screen DC
2 pixels for the current mouse position
CPoint pt;
GetCursorPos (& pt); file / / get the current mouse location
COLORREF clr =:: GetPixel (hDC, pt.x, pt.y); file / / get the current pixel value the mouse
3, decomposition of the pixels in the red, green and blue color values
CString ClrText;
ClrText.Format ("% d", GetRValue (clr)); file / / the red value decomposition
ClrText.Format ("% d", GetGValue (clr)); file / / decomposition of the green value
ClrText.Format ("% d", GetBValue (clr)); file / / decomposition of the blue value
:: ReleaseDC (NULL, hDC); file / / release the screen DC
Concrete realization of the above part of the code details, download the example code in after carefully looking at the source can (with detailed comments).
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