Re: how can i get the height of a line in a richeditctrl

Thinking about your problem this morning I came up with this

//LineNum is the zero based index of the line you want to measure
int GetLineHeight(CRichEditCtrl *pEdit,int LineNum)
{
   if (pEdit == NULL || pEdit->GetSafeHwnd() == NULL)
   {
      return -1;
   }

   int StartIndex = pEdit->LineIndex(LineNum);
   int EndIndex = pEdit->LineIndex(LineNum+1);

   if (EndIndex == -1)
   {
      EndIndex = pEdit->GetTextLength() - 1;
   }

   if (StartIndex == EndIndex)
   {
      return -1;
   }

   CDC *DC = pEdit->GetDC();

   // Get the page width and height from the screen.
   int X = 0;
   int Y = 0;
   int X2 = ::MulDiv(2000,1440, DC->GetDeviceCaps(LOGPIXELSX));
   int Y2 = ::MulDiv(2000,1440, DC->GetDeviceCaps(LOGPIXELSY));
   CRect rcPage(X,Y,X2,Y2);

   FORMATRANGE Fr;
   Fr.hdc = NULL;
   Fr.hdcTarget = DC->m_hDC;
   Fr.rc = rcPage;
   Fr.rcPage.left = Fr.rcPage.top = Fr.rcPage.right = Fr.rcPage.bottom = 0;
   Fr.chrg.cpMin = StartIndex;
   Fr.chrg.cpMax = EndIndex;

   pEdit->FormatRange(&Fr,FALSE);
   pEdit->FormatRange(NULL,FALSE);

   int NewY = ::MulDiv(Fr.rc.bottom,DC->GetDeviceCaps(LOGPIXELSY),1440);

   pEdit->ReleaseDC(DC);

   return NewY;
}

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