Advanced MFC Programming

Chapter 9. Font
for(i=0; iGetSafeHandle() != NULL);
ptrFtOld=pDC->SelectObject(ptrFont);
pDC->TextOut(10, nYPos, (m_lpLf[1]+i)->lfFaceName);
nYPos+=(m_lpLf[1]+i)->lfHeight;
pDC->SelectObject(ptrFtOld);
ptrFont++;
}
nYPos+=20;
szStr.Format("Number of TrueType fonts: %d", m_nFontCount[2]);
pDC->TextOut(10, nYPos, szStr);
nYPos+=20;
}
for(i=0; iGetSafeHandle() != NULL);
ptrFtOld=pDC->SelectObject(ptrFont);
pDC->TextOut(10, nYPos, (m_lpLf[2]+i)->lfFaceName);
nYPos+=(m_lpLf[2]+i)->lfHeight;
pDC->SelectObject(ptrFtOld);
ptrFont++;
}
For each font family, all the font face names are listed. Three loops are used for this purpose. Within
each loop, one of the enumerated font is selected into the target DC, and function CDC::TextOut(…) is
called to output the font’s face name to the window. To avoid text from overlapping one another, a local
variable nYPos is used as the vertical orgin of the output text, which will increment each time after a line of
text is output to the window.
Because the memory is allocated at the initialization stage, we need to free it when the application
exits. In the sample, WM_DESTROY message handler is added to class CGDIView through using Class Wizard,
and the corresponding member function is implemented as follows:
void CGDIView::OnDestroy()
{
CScrollView::OnDestroy();
if(m_lpLf[0] != NULL)delete [](BYTE *) m_lpLf[0];
if(m_lpLf[1] != NULL)delete [](BYTE *) m_lpLf[1];
if(m_lpLf[2] != NULL)delete [](BYTE *) m_lpLf[2];
if(m_ptrFont != NULL)delete []m_ptrFont;
}
The application is now ready to enumerate all the available fonts in the system.
9.3 Output Text Using CDC::ExtTextOut(…)
Function CDC::ExtTextOut(…)
Usually we use function CDC::TextOut(…) to output text. There is another powerful function CDC::
ExtTextOut(…), which allows us to output the text to a specified rectange. We can use either transparent or
opaque drawing mode. In the latter case, we can also specify a background color. Besides this, we can set
the distances between neighboring characters of the text. One version of function CDC::ExtTextOut(…) has
the following format:
BOOL CDC::ExtTextOut
(
int x, int y,
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