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POUsing a method to get Embedded Font Causes Protected Memory Error
 

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  1. POUsing a method to get Embedded Font Causes Protected Memory Error
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    <p>I am using this code to get an embedded font:</p> <pre><code>/// &lt;summary&gt; /// Returns an Embedded Font /// &lt;/summary&gt; /// &lt;param name="ImagePath"&gt;String begins with namespace e.g MyProgram.Image.png&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static Font GetEmbeddedFont(string FontPath, float Size) { Font _font = null; Thread getFontThread = new Thread(() =&gt; GetFont(FontPath, Size, out _font)); getFontThread.Start(); getFontThread.Join(); return _font; } #region GetFont private static void GetFont(string FontPath, float Size, out Font FontOut) { Font fnt = null; Assembly asm = Assembly.GetExecutingAssembly(); Stream resStream = asm.GetManifestResourceStream(FontPath); if (null != resStream) { // // GDI+ wants a pointer to memory, GDI wants the memory. // We will make them both happy. // // First read the font into a buffer byte[] rgbyt = new Byte[resStream.Length]; resStream.Read(rgbyt, 0, rgbyt.Length); resStream.Close(); // Then do the unmanaged font (Windows 2000 and later) // The reason this works is that GDI+ will create a font object for // controls like the RichTextBox and this call will make sure that GDI // recognizes the font name, later. uint cFonts; AddFontMemResourceEx(rgbyt, rgbyt.Length, IntPtr.Zero, out cFonts); // Now do the managed font IntPtr pbyt = Marshal.AllocCoTaskMem(rgbyt.Length); if (null != pbyt) { Marshal.Copy(rgbyt, 0, pbyt, rgbyt.Length); m_pfc = new PrivateFontCollection(); m_pfc.AddMemoryFont(pbyt, rgbyt.Length); Marshal.FreeCoTaskMem(pbyt); } } if (m_pfc.Families.Length &gt; 0) { // Handy how one of the Font constructors takes a // FontFamily object, huh? :-) fnt = new Font(m_pfc.Families[0], Size); } m_pfc.Dispose(); FontOut = fnt; } </code></pre> <p>I use a Thread to attempt to wait for it to finish, because the error seems to occur, if this method is called multiple times within a short space of time.</p> <p>How can I stop this error occuring, I think it has something to do with the method being called within quick succession of each other.</p> <p>I get the exception here:</p> <pre><code>_font = value; using (Graphics g = _parent.CreateGraphics()) { SizeF soize = g.MeasureString(_text, _font); _size = new Size((int)soize.Width, (int)soize.Height); _width = _size.Width; _height = _size.Height; } </code></pre> <p>On the line g.MeasureString(_text, _font);</p> <p>However I know that the error is in the GetEmbeddedFont Method, as it only throws an error if the font is set using the GetEmbeddedFont method.</p> <p>It will work fine once, but if it is used a second time to shortly after the first, it will throw the error.</p> <p>And if I debug the code, _font returns this:</p> <pre><code>{Name = '((System.Drawing.Font)(_font)).fontFamily.Name' threw an exception of type 'System.ArgumentException' Size=15.0} </code></pre>
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COWhy are you doing this on a separate thread? You immediately call `Join()` after starting the thread, which causes the calling thread to block until it finishes anyway. Seems completely pointless to me.
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      1. POUsing a method to get Embedded Font Causes Protected Memory Error
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    2. COSo it waits until it is done, it was an attempt to stop it being called in quick succession but it did not work. I'm just showing what I have already tried.
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      1. POUsing a method to get Embedded Font Causes Protected Memory Error
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    3. COWhat line is giving you an exception?
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