using uDMX API in c# | 易学教程

问题

I am relative new in c# and I want to use this uDMX API, but when I try to add the uDMX.dll file I get this error: "The reference is not vaild or not supported" (see screenshot (in german)) - I can't add images yet -

Or am I doing it completely wrong? I did not find another uDMX api or .dll file.

Hope for your help and Ideas.

回答1:

You cant import an unmanaged win32 dll into a managed c# application like that, you need to specify the methods and parameters yourself.

The uDMX api exposes these methods

bool _stdcall     Configure() ;
bool _stdcall     Connected() ;
bool _stdcall     ChannelSet(long Channel, long Value) ;
bool _stdcall     ChannelsSet(long ChannelCnt, long Channel, long* Value) ;
bool _stdcall     Info() ;

In order to use them in managed code, you need to provide the declaration, return value and parameters to .Net

This is done by marking a method as external and informing .Net where to find it, use the DllImport attribute found in the System.Runtime.InteropServices namespace.

using System;
using System.Runtime.InteropServices;
class uDMXTest
{
  [DllImport("uDMX.dll")]
  public static extern bool Configure();

  public static void Main()
  {
    bool result;
    result = Configure();
    Console.WriteLine(result);
  }
}

Example on howto provide a declaration of the Configure method, and howto use it. You can declare the other methods in uDMX.dll the same way - note you may need to give the full path to uDMX.dll in the DllImport attribute

More info here : https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.dllimportattribute?view=netframework-4.8

来源：https://stackoverflow.com/questions/59311959/using-udmx-api-in-c-sharp

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api

dll

dllimport