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Question by STANLY1997 · Apr 20, 2021 at 09:08 AM · programmingvisual studiodll

How to use dll files properly in Unity?

I wrote a program that puts an QR-Code on a PDF page. Now i want it to be part of a Unity project and i am having trouble with implementing it.

Used in the project:

 using System.Drawing;
 using PdfSharp.Drawing;
 using PdfSharp.Pdf;
 using System.IO;

Here is the problem:

 XFont font = new XFont(tkFont, fontSize, XFontStyle.Regular);

new XFont gets underlined red. It is part of PdfSharp.Drawing; but once i try to use it in Unity, Visual Studio tells me that: "The type 'FontFamily' allegedly has been declared in System.Drawing but could not been found", even thoit originates from PdfSharp.Drawing.

I already tried to set Unity .NET from Version 2.0 to 4.x and i also tried different packages in terms of version numbers.

It is the first time that i try to implement external dll files into unity, so maybe the problem could be something related to that.

Also other things that originate from PdfSharp.Drawing like XGraphics seem to work properly

All in all, Visual Studio is able to run it, Unity is not able to do so even tho i imported all necessary dll files.

I hope somebody can help me with this. Thanks in advance for every bit of hints you can give me.

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avatar image Bunny83 · Apr 20, 2021 at 12:46 PM 0
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even tho i imported all necessary dll files.

That's where you should get a lot more concrete what you did ^^. What files did you put where exactly?

avatar image STANLY1997 Bunny83 · Apr 20, 2021 at 01:29 PM 0
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I downloaded the dll files that VisualStudio needed to run the program, which are: MessagingToolkit.QRCode.1.3.0 Zen.Barcode.Rendering.Framework.3.1.10729.1 PdfSharp.1.50.5147 System.Text.Encoding.CodePages and also System.Drawing.Common which is located under Assets/Plugins/net20 the weird thing is that System.Drawing does not contain "FontFamily" when used in Unity.

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