c++ - ellipse as checked icon in a menu -


i'm creating context menu window , i'd have in submenu filled ellipses, each in different colour, instead of texts - submenu responsible choosing colour. don't know how it... know concrete example? i've read on msdn pages owner-drawn menu items, there no example concerning specific task - so, don't know how it. later tried change checked icon menu item - turned out dev-c++ (under windows 7) knows neither setdcbrushcolor nor dc_brush, , still don't know how change checked icon without loading image file. added @ beginning of program following lines:

#define _win32_ie 0x0600 #define winver  0x0700 #define _win32_winnt 0x0700

then compiler doesn't protest, however, icon black, when i'm trying following code , whatever colour i'm choosing:

hwnd hwnd = getdesktopwindow(); hdc hdc = getdc( hwnd ); hdc hdcmem = createcompatibledc( hdc ); size size = { getsystemmetrics( sm_cxmenucheck ), getsystemmetrics( sm_cymenucheck ) }; hbitmap bitmap = createcompatiblebitmap( hdcmem, size.cx, size.cy ); hbitmap bitmapold = (hbitmap) selectobject( hdcmem, bitmap ); patblt( hdcmem, 0, 0, size.cx, size.cy, whiteness ); hbrush brushold = (hbrush) selectobject( hdcmem, getstockobject( null_brush ) ); ellipse( hdcmem, 0, 0, size.cx, size.cy); setdcbrushcolor( hdcmem, rgb(0,0,255) ); selectobject( hdcmem, getstockobject( dc_brush ) ); ellipse( hdcmem, 2, 2, size.cx-2, size.cy-2 ); selectobject( hdcmem, brushold ); selectobject( hdcmem, bitmapold ); deletedc( hdcmem ); releasedc( hwnd, hdc ); setmenuitembitmaps( mnu_t, (30*m_menu_t+25), mf_bycommand, bitmap, bitmap);// mnu_t , m_menu_t variables

can me?

the problem here:

hbitmap bitmap = createcompatiblebitmap( hdcmem, size.cx, size.cy );

this natural , rational statement write, doesn't people expect do. it's common mistake , can take forever figure out source of problem here. know making mistake more once myself.

createcompatiblebitmap not create bitmap that's compatible specified device context (dc). well, does--sort of--but it's more nuanced that: creates new bitmap that's compatible bitmap that's selected specified dc.

when creating memory dc createcompatibledc, new dc gets default bitmap 1 pixel wide 1 pixel high , color depth of 1 bit. not intuitive @ all, since asked dc compatible screen dc, , screen (almost certainly) has more 1 bit of color depth.

so when call createcompatiblebitmap new bitmap of specified size uses 1 bit per pixel. can draw it, and, if stars align, you'll see crude outline of drew. if stars aren't aligned, you'll end pixels being single color.

when blit 1-bit per pixel bitmap dc, current text foreground , background colors used. since foreground text color black, end black rectangle , virtually no clue went wrong.

the solution specify screen or window dc instead of memory dc in call createcompatiblebitmap. create new bitmap has same color depth bitmap used screen, far more useful.


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