Re: RAII classes to simplify GDI programming

Thanks for sharing.

I had something similar for my own projects, in an even more C++ templated
way :)

https://gist.github.com/1385377



On Mon, Nov 21, 2011 at 8:37 PM, Peter Kvitek <[email protected]> wrote:

> I've been using WTL for years and always felt it's the most useful tool
> ever
> created for Win32 GUI programming. Thank you, Nenad!
>
> However, GDI programming still lacks the level of elegance common for WTL.
> For example, to set up a display context for drawing, one has to write code
> like this:
>
> HFONT hFontOld = dc.SelectFont(hMyFont);
> COLORREF clrOld = dc.SetTextColor(clrMyTextColor);
> HBITMAP hbmOld = dcMem.SelectBitmap(hMyBitmap);
>
> . (drawing code)
>
> dcMem.SelectBitmap(hbmOld);
> dc.SetTextColor(clrOld);
> dc.SelectFont(hFontOld);
>
> It's tedious, hard to maintain and leads to resource leaks if the drawing
> code does not proceed to cleanup part.
>
> A set of simple RAII classes found here:
> http://www.kvitek.com/pub/atlgdiraii.h resolves all these problems and
> makes
> GDI drawing code much more elegant and safe, here's the example:
>
> CSelectFont selectFont (dc, hMyFont);
> CSetTextColor setTextColor (clrMyTextColor);
> CSelectBitmap selectBitmap (dcMem, hMyBitmap);
>
> . (drawing code)
>
>
>
> Below is the list of classes that are implemented. I believe this covers
> all
> the important GDI states, let me know if I missed something.
>
> CSelectPen
> CSelectBrush
> CSelectFont
> CSelectBitmap
> CSelectPalette
> CSetBkMode
> CSetBkColor
> CSetTextColor
> CSetPolyFillMode
> CSetROP2
> CSetStretchBltMode
> CSetMapMode
> CSetArcDirection
> CSetTextCharacterExtra
> CSetBrushOrg
> CSaveRestoreDC
>
> Feel free to use it any way you like. I hope you'll find it as useful as I
> did.
>
> Thank you,
> /Peter
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>


[Non-text portions of this message have been removed]



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