This means that the selected font does not have the chars available.
You have to select a font that has the glyphs you need into the device context.
something like this maybe:
CFont font;
font->CreateFont(16,0,0,0,400,FALSE,FALSE,0,ANSI_CHARSET,
OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,
ANTIALIASED_QUALITY,DEFAULT_PITCH|FF_SWISS,
"Tahoma");
pDC->SelectObject(font);
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