create a dll with reference to a nuget library

[fxl447098457]

here are the codes.i tried the dll in vba. class worked with the CreateIm method not available.error info:“QRCoder, Version=1.3.5.0, Culture=neutral, PublicKeyToken=null” or one of its dependencies. The system cannot find the file specified. could you give me some advice.many thx.

`using QRCoder; using System; using System.Drawing; using System.Runtime.InteropServices;

namespace Qrcode { [ComVisible(true), ClassInterface(ClassInterfaceType.AutoDual)] public class myqrcode { [return: MarshalAs(UnmanagedType.SysInt)] public int CreateIm([MarshalAs(UnmanagedType.BStr)]string s, [MarshalAs(UnmanagedType.BStr)]string filePath) { QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeData qrCodeData = qrGenerator.CreateQrCode(s, QRCodeGenerator.ECCLevel.Q); QRCode qrCode = new QRCode(qrCodeData); Bitmap qrCodeImage = qrCode.GetGraphic(5, Color.Black, Color.White, null, 15, 6, false); qrCodeImage.Save(filePath); return 0; } } static class UnmanagedExports { [DllExport] [return: MarshalAs(UnmanagedType.IDispatch)] static Object CreateQrcodeClass() { return new myqrcode(); } } } `

[3F]

@fxl447098457 This is [ probably ] what you need: https://github.com/3F/DllExport/issues/86#issuecomment-429107792 Because I'm not sure what you're talking about at all. Does this have a bug or just a question.

Can you ask more clearly if it's not, sorry.

[fxl447098457]

@3F just a question. it seems that 3rd dll does not work.should i use assembly to load the library just like #86?look forward to your reply.

[3F]

An assemblyResolve as one of the options. Follow my recommendations there with the user's example from last reply.

You need to try to use a common practice when debugging third-party libraries, look here: https://github.com/3F/DllExport/issues/84#issuecomment-417937869

• /Examples/DllExport/BasicExport also illustrates structure for catching errors together with interactive debugging at runtime. That is, you also can try to adapt this code for checking any caused errors in your case.

[fxl447098457]

sorry for my late feedback.assemblyreslove did work.