Hi all After upgrading to 4.8 we are seeing a "Class already exists"

[Jarek I]

After upgrading to 4.8 we are seeing a "Class already exists" 

I have read the thread https://groups.google.com/g/migrated-by-firefly/c/TJMHUKRikUI/m/2hEOpznzDQAJ.

However, our company performed the migration in 2017, and in our Firefly\UI\RichTextBoxEx.cs file
we do not have the option to set UseVersion41 = false.

Is there any chance to resolve this error in our case?

Best regards

Jarek

[Noam Honig]

Hi Jarek,

Here's the relevant code from our updated source code - see if you can apply that to your code somewhere.

Alternatively, you can reach out to Gilad, and ask for an updated version of env & firefly's source code, and you can investigate there and apply the changes selectively to your code.

I don't recommend simply upgrading to the latest firefly & ENV since that would require some testing effort that you may want to avoid

class RichTextBoxV5 : RichTextBox
{
    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr LoadLibrary(string lpFileName);

    static IntPtr _msfteditHandle = IntPtr.Zero;
    static bool _msfteditNotFound;

    protected override CreateParams CreateParams
    {
        get
        {
            var p = base.CreateParams;
            if (UseVersion41 && !p.ClassName.Equals("RichEdit50W", StringComparison.InvariantCultureIgnoreCase))
            {
                if (_msfteditHandle == IntPtr.Zero && !_msfteditNotFound)
                {
                    _msfteditHandle = LoadLibrary("msftedit.dll");
                    if ((long)_msfteditHandle < 32L)
                        _msfteditNotFound = true;
                }
                if (!_msfteditNotFound)
                    p.ClassName = "RichEdit50W";
            }
            if (BackColor == Color.Transparent)
                p.ExStyle |= 0x20;
            return p;
        }
    }

    public RichTextBoxV5()
    {
        UseVersion41 = true;
        SetStyle(ControlStyles.SupportsTransparentBackColor, true);
        this.DetectUrls = false;
    }

    public override Color BackColor
    {
        get { return base.BackColor; }
        set
        {
            var x = base.BackColor;
            base.BackColor = value;
            if (x != value && (value == Color.Transparent || x == Color.Transparent))
                RecreateHandle();
        }
    }

    internal protected bool UseVersion41 { get; set; }
}

Noam Honig  

Founder & CEO

www.fireflymigration.com

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