CODEWITHSUNDEEP
c#fontsmonosystem.drawingprivatefontcollection
user3446605
user3446605

Reputation: 39

Why application crash when i use PrivateFontCollection.Dispose() in mono3.2.3 c#?

I'm writing a library in C# that allows me to convert HTML to PDF. Obviously the idea is that it is cross-platform and why I'm doing with mono. To do this I have to load Seller fonts with System.Drawing.Text.PrivateFontCollection class.

When the application finishes executing all the code, the application unexpectedly quits. After many tests, I realized that the problem is when it is called the Dispose method System.Drawing.Text.PrivateFontCollection or when Dispose() of System.Drawing.FontFamily is called.

This problem is in Windows (I have Windows 7 32 bit), in linux I have no problem.

This is the test code

using System;
using System.Drawing.Text;
using System.IO;
using System.Runtime.InteropServices;
using System.Drawing;

namespace FORM
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            PrivateFontCollection pf = new PrivateFontCollection ();
            IntPtr fontBuffer = IntPtr.Zero;
            pf.AddFontFile ("C:\\Users\\James\\Downloads\\open sans\\open-sans.regular.ttf");

            Font f = new Font (pf.Families[0],12,FontStyle.Regular);

            try {
                pf.Dispose ();
            }
            catch{
            }
            pf = null;
            Console.WriteLine ("Hello World!");
            Console.ReadLine ();

            //pf.Dispose ();
        }
    }
}

Upvotes: 0

Views: 832

Answers (1)

bastos.sergio
bastos.sergio

Reputation: 6764

Are you always calling Dispose?

You need to always call Dispose when using unmanaged resources.

Another way of calling Dispose is with the using keyword...

Example (before running this, do a restart on your pc to make sure all resources have been freed):

using System;
using System.Drawing.Text;
using System.IO;
using System.Runtime.InteropServices;
using System.Drawing;

namespace FORM
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            using (PrivateFontCollection pf = new PrivateFontCollection())
            {
                IntPtr fontBuffer = IntPtr.Zero;
                pf.AddFontFile("C:\\Windows\\Fonts\\times.ttf");

                Font f = new Font(pf.Families[0], 12, FontStyle.Regular);
            }

            Console.WriteLine("Hello World!");
            Console.ReadLine();
        }
    }
}

Upvotes: 0

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