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Equivalence between twips and inches or pixels

Posted on 2000-05-13
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Last Modified: 2013-11-20
Hi all..

I have added an ActiveX control to my application.. specifically it is a FlexGrid control. I need to know the height of the row so that I will be able to define the number of rows at run time. The problem is that the FlexGrid RowHeight property returns a value measured in twips, so that I need to convert it into pixels. That way I could use GetClientRect to know how many rows the control need to have when application is initialized.

I use Visual C++ 6.0.

Any advice? suggestion? help?
Thanks a lot in advance

Demarcy
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Question by:demarcy
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vbk_bgm earned 70 total points
ID: 2807943
Hi,
1440 twips make an inch(=72 points).

To make conversion from pixels to twips,
CClientDC dc(this);
int pixels_per_inchX = dc.GetDeviceCaps(LOGPIXELSX);
int pixels_per_inchY = dc.GetDeviceCaps(LOGPIXELSY);
CRect rect;
GetClientRect(rect);
int client_width_in_twips = rect.Width()*1440/pixels_per_inchX;
int client_height_in_twips = rect.Height()*1440/pixels_per_inchY;

Hope this helps!
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Author Comment

by:demarcy
ID: 2808588
Thanks for your comment...

I saw you used CClientDC... I have used CDC* pDC = GetDC() instead and it worked.. is it right? or should I use CClientDC in that case?

Demarcy
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Expert Comment

by:vbk_bgm
ID: 2809712
You can use either CClientDC or GetDC. If you use GetDC make sure to release the DC using ReleaseDC.
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