Frage zu MeasureCharacterRange bzw. new und delete

Zauberspiegel

Hallo,

ich habe eine Verständnisfrage zu folgendem Beispiel auf der Seite:

http://msdn.microsoft.com/en-us/library/ms535796(v=VS.85).aspx

VOID MeasureCharRanges(HDC hdc)
{
   Graphics graphics(hdc);

   // Brushes and pens used for drawing and painting
   SolidBrush blueBrush(Color(255, 0, 0, 255));
   SolidBrush redBrush(Color(100, 255, 0, 0));
   Pen        blackPen(Color(255, 0, 0, 0));

   // Layout rectangles used for drawing strings
   RectF   layoutRect_A(20.0f, 20.0f, 130.0f, 130.0f);
   RectF   layoutRect_B(160.0f, 20.0f, 165.0f, 130.0f);
   RectF   layoutRect_C(335.0f, 20.0f, 165.0f, 130.0f);

   // Three different ranges of character positions within the string
   CharacterRange charRanges[3] = { CharacterRange(3, 5),
                                    CharacterRange(15, 2),
                                    CharacterRange(30, 15), };

   // Font and string format to apply to string when drawing
   Font         myFont(L"Times New Roman", 16.0f);
   StringFormat strFormat;

    // Other variables
   Region* pCharRangeRegions; // pointer to CharacterRange regions
   short   i;                 // loop counter
   INT     count;             // number of character ranges set
   WCHAR   string[] = L"The quick, brown fox easily jumps over the lazy dog.";

   // Set three ranges of character positions.
   strFormat.SetMeasurableCharacterRanges(3, charRanges);

   // Get the number of ranges that have been set, and allocate memory to 
   // store the regions that correspond to the ranges.
   count = strFormat.GetMeasurableCharacterRangeCount();
   pCharRangeRegions = new Region[count];

   // Get the regions that correspond to the ranges within the string when
   // layout rectangle A is used. Then draw the string, and show the regions.
   graphics.MeasureCharacterRanges(string, -1,
      &myFont, layoutRect_A, &strFormat, count, pCharRangeRegions);
   graphics.DrawString(string, -1,
      &myFont, layoutRect_A, &strFormat, &blueBrush);
   graphics.DrawRectangle(&blackPen, layoutRect_A);
   for ( i = 0; i < count; i++)
   {
      graphics.FillRegion(&redBrush, pCharRangeRegions + i);
   }

   // Get the regions that correspond to the ranges within the string when
   // layout rectangle B is used. Then draw the string, and show the regions.
   graphics.MeasureCharacterRanges(string, -1,
      &myFont, layoutRect_B, &strFormat, count, pCharRangeRegions);
   graphics.DrawString(string, -1,
      &myFont, layoutRect_B, &strFormat, &blueBrush);
   graphics.DrawRectangle(&blackPen, layoutRect_B);
   for ( i = 0; i < count; i++)
   {
      graphics.FillRegion(&redBrush, pCharRangeRegions + i);
   }

   // Get the regions that correspond to the ranges within the string when
   // layout rectangle C is used. Set trailing spaces to be included in the
   // regions. Then draw the string, and show the regions.
   strFormat.SetFormatFlags(StringFormatFlagsMeasureTrailingSpaces);
   graphics.MeasureCharacterRanges(string, -1,
      &myFont, layoutRect_C, &strFormat, count, pCharRangeRegions);
   graphics.DrawString(string, -1,
      &myFont, layoutRect_C, &strFormat, &blueBrush);
   graphics.DrawRectangle(&blackPen, layoutRect_C);
   for ( i = 0; i < count; i++)
   {
      graphics.FillRegion(&redBrush, pCharRangeRegions + i);
   }
}

Frage:

Was ist mit der Zeile:

pCharRangeRegions = new Region[count];

Warum wird in dem Beispiel kein "delete" am Ende aufgerufen? Hat das einen Grund?

Martin Richter

Für mich fehlt ein delete []. IMHO ein Bug und Leak.