GetFontSize

POINT CDefaultAppFont::GetFontSize(CFont* pFont,CHAR *str)
{
	POINT p = { 0 };
	auto mainWindow = AfxGetApp()->GetMainWnd();
	if (mainWindow != NULL) {
		auto hDC = GetWindowDC(mainWindow->m_hWnd);
		CDC* pDC = CDC::FromHandle(hDC);
		CFont* pOldFont = pDC->SelectObject(pFont);
		SIZE sizeText;
		if (str == NULL) {
			GetTextExtentPoint32(pDC->m_hDC, "Z", 1, &sizeText);
		}
		else {
			GetTextExtentPoint32(pDC->m_hDC, str, strlen(str), &sizeText);
		}
		pDC->SelectObject(pOldFont);
		p.y = sizeText.cy;
		p.x = sizeText.cx;

	}
	return p;
}