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I must change color of title bar, from white to blue..I tried with:

int CDlgEstimateTime::OnCreate(LPCREATESTRUCT lpCreateStruct)
	if (CDialog::OnCreate(lpCreateStruct) == -1)
		return -1;

	DWORD aOldColors[2];
	COLORREF new_c;

	//aNewColors[0] = RGB(0x80, 0x80, 0x80);  // light gray 
	new_c = RGB(255, 255, 255);  // dark purple 

	//SetSysColors(2, aElements, aNewColors);
	SetSysColors(2, aElements, &new_c);
	return 0;

it doesn't work, color of title bar doesn't change, but change color of CTrlList insdide my dialog, I don't know why..

What I have tried:

How Can I solve? I tried code that I've written

I tried:
void CDlgEstimateTime::OnNcPaint() 
	/*CPaintDC dc(this); //<- calls `BeginPaint`
	dc.Rectangle(CRect(0, 0, 400, 400));
	COLORREF NewColor = RGB(255, 0, 0);
	::SetSysColors(1, &flag, &NewColor);
} //<- EndPaint 

but sometimes it works and sometimes title bar is white, I don't know why
Updated 27-Sep-22 3:36am

See GetSysColor function (winuser.h) - Win32 apps | Microsoft Learn[^]; most of these colour changes are no longer supported.

Note that the third parameter should be an array of values corresponding to the aElements array: you have:
new_c = RGB(255, 255, 255);  // dark purple
SetSysColors(2, aElements, &new_c);

Which is incorrect as new_c is not an array of colours. Also RGB(255, 255, 255) is white, not purple.
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Member 14594285 22-Sep-22 9:41am    
I know, in fact I tried whith black but it's the same thing...but is it right the function SetSysColors? How must I use it?
Richard MacCutchan 22-Sep-22 10:13am    
Yes, it is the right function. However, you need to follow the link I gave you and study the documentation for correct usage.
Member 14594285 22-Sep-22 11:34am    
I improved my question
Richard MacCutchan 22-Sep-22 11:41am    
And you are still using one of the values where the notes include:
Windows 10 or greater: This value is not supported.
Member 14594285 22-Sep-22 11:45am    
which value
I just tested the SetSysColors() example from Microsoft on Win10.
Absolutely nothing happens if you don't disable the visual styles with SetWindowTheme().
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Member 14594285 23-Sep-22 2:52am    
I tried this code but now I have google with background gray and the title bar of my MFC application is white..I don't know

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