Developer Network >> Visual C++ & C++ Programming >> C++ and WinAPI

Number of Pixels in a form?

Hello,
I want to count how many pixels there are in a window.
Is there another way apart from using GetPixel to access each pixel ?

[139 byte] By [chals1] at [2007-11-20 10:51:20]

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# 1 Re: Number of Pixels in a form?

GetWindowRect will give you the dimensions of a window ( client area + non-client area) in pixels.

GetClientRect will give you the dimensions of a client are of a window in pixels.

kirants at 2007-11-9 13:32:14 >

# 2 Re: Number of Pixels in a form?

Thanks, but i had in mind irregular shaped forms. Maybe there's a bmp function to count pixels to avoid using GetPixel. Any further help, please?

chals1 at 2007-11-9 13:33:24 >

# 3 Re: Number of Pixels in a form?

GetRegionData is the function that gets information about a region.
First get region of a form/dialog, then obtain RGNDATA.

HRGN rgn;

if(GetWindowRgn(hDlg, rgn)) {
RGNDATA rd;
GetRegionData(rgn, sizeof(RGNDATA), &rd);

DWORD nRects = rd.rdh.nCount; //I think this is what you want
}

I hop this helps.

regards

Ali Imran at 2007-11-9 13:34:23 >

# 4 Re: Number of Pixels in a form?

edit

chals1 at 2007-11-9 13:35:17 >

# 5 Re: Number of Pixels in a form?

Thank you very much !!

I'll try to extract every rectangle from the RGNDATA buffer that contains the RECT structures

regards

chals1 at 2007-11-9 13:36:26 >

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