winforms - problem with TextRenderer.MeasureText

Question

Hi I am using TextRenderer.MeasureText() method to measure the text width for a given font. I use Arial Unicode MS font for measuring the width, which is a Unicode font containing characters for all languages. The method returns different widths on different servers. Both machines have Windows 2003, and .net 3.5 SP1 installed.

Here is the code we used

using (Graphics g = Graphics.FromImage(new Bitmap(1, 1)))
{                
    width = TextRenderer.MeasureText(g, word, textFont, new Size(5, 5), TextFormatFlags.NoPadding).Width;
}

Any idea why this happens?

I use C# 2.0

Answer 1

//--------------------------------------------------------------------------------------
// MeasureText always adds about 1/2 em width of white space on the right,
// even when NoPadding is specified. It returns zero for an empty string.
// To get the precise string width, measure the width of a string containing a
// single period and subtract that from the width of our original string plus a period.
//--------------------------------------------------------------------------------------

public static Size MeasureText(string Text, Font Font) {
  TextFormatFlags flags
    = TextFormatFlags.Left
    | TextFormatFlags.Top
    | TextFormatFlags.NoPadding
    | TextFormatFlags.NoPrefix;
  Size szProposed = new Size(int.MaxValue, int.MaxValue);
  Size sz1 = TextRenderer.MeasureText(".", Font, szProposed, flags);
  Size sz2 = TextRenderer.MeasureText(Text + ".", Font, szProposed, flags);
  return new Size(sz2.Width - sz1.Width, sz2.Height);
}