C# Signature:

        [DllImport("dmcl40.dll", EntryPoint="dmAPIGet", CharSet=CharSet.Ansi, ExactSpelling=true,CallingConvention=CallingConvention.Cdecl)]
        private extern static string dmAPIGet(string cmd);

Sample Code:

public string Get(string command, params object[] args)
{
    string cmd  = String.Format(null,command, args);
    string res = dmAPIGet(cmd);
    return res;
}

Alternative Managed API:

Do you know one? Please contribute it!