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1、先引用你的dll（不要说你不知道怎么引用）
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2、using你dll的命名空间
3、在代码中声明dll中的类（如：Lyric * l = new Lyric();）
4、接着开始编程
假如你的dll中的Lyric类有GetLyric（FileName）的方法，就直接写上去就可以了（如：String * s = l.GetLyric("C:\\1.lrc");）
如果你是要在C++中编辑这个已经生成的DLL，那是不可能的
我不是很会c++，有无法错误自己改
Option Explicit On
Option Strict On
Imports System
Module Program
Sub Main()
Dim y,m,t As Integer
begin:
' 输入数据时一行一个
y=CInt(Console.ReadLine())
m=CInt(Console.ReadLine())
t=CInt(Console.ReadLine())
If y100 Then
y=y+2000
End If
If y1916 OrElse m200 Then
Console.WriteLine("ERROR")
goto begin
End If
pr(y,m,t)
Console.Write("Press any key to continue . . . ")
Console.ReadKey(True)
End Sub
Function pr(y As Integer,m As Integer,t As Integer) As Integer
Dim ye,[Me],i As Integer
ye=CInt((m+t-2)/12+y)
[Me]=(m+t-2) Mod 12+1
Console.WriteLine(" {0}-{1} ~ {2}-{3}",y,m,ye,[Me])
ye=y
[Me]=m
For i=0 To t-1
prmonth(ye,[me])
[Me]=[Me]+1
If [Me]12 Then
ye=ye+1
[me]=1
End If
Next
Return 0
End Function
Function yam(y As Integer,m As Integer) As Integer
Dim st As String()={"未定义","一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"}
Console.WriteLine(" {0} {1}",y,st(m))
Console.WriteLine("----------------------------")
Return 0
End Function
Function ryear(y As Integer) As Integer
If 0=y Mod 400 OrElse (0y Mod 100 AndAlso 0=y Mod 4) Then
Return 1
Else
Return 0
End If
End Function
Function mday(y As Integer,m As Integer) As Integer
Dim day As Integer()={0,31,28,31,30,31,30,31,31,30,31,30,31}
Dim ad As Integer=0
If 2=m Then
ad=ryear(y)
End If
Return day(m)+ad
End Function
Function monday(y As Integer,m As Integer) As Integer
Dim md As Integer=6
Dim i,daynum As Integer
For i=1916 To y-1
daynum=365+ryear(i)
md=(md+daynum) Mod 7
Next
For i=1 To m-1
md=(md+mday(y,i)) Mod 7
Next
Return md
End Function
Function prmonth(y As Integer,m As Integer) As Integer
Dim md As Integer=monday(y,m)
Dim daysnum As Integer=mday(y,m)
Dim days As Integer=daysnum+md
Dim i As Integer
yam(y,m)
Console.Write(" 日 一 二 三 四 五 六")
For i=0 To days-1
If 0=i Mod 7 Then
Console.WriteLine()
Console.WriteLine()
Console.Write(" ")
End If
If i-md=0 Then
Console.Write(" {0,2}",i-md+1)
Else
Console.Write(" ")
End If
Next
Console.WriteLine()
Console.WriteLine()
Return 0
End Function
End Module
按照我的理解，你的这个需求是没有办法做到的， 除非C#的dll被封装为了一个COM组件并且注册了，但是你的这个dll已经写成了，所以理论上来说应该不是com，而C#的程序集是不提供向前兼容的，所以用一个老的语言调用新的技术的组件是做不到的，不过也有一种可能性，不过很难实现，大体逻辑这样，首先通过vb调用一个native的组件，用C或者c++完成，在这个组件里面加载clr，在clr里面加载c#的程序集，实例化对象，执行调用
建议用CLRInsideOut这个软件自动声明。这是我用它翻译成vb.net声明的结果：
System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential) _
Public Structure tagRECT
'''LONG-int
Public left As Integer
'''LONG-int
Public top As Integer
'''LONG-int
Public right As Integer
'''LONG-int
Public bottom As Integer
End Structure
System.Runtime.InteropServices.DllImportAttribute("Unknown", EntryPoint:="dMain") _
Public Shared Sub dMain(ByVal pImage As System.IntPtr, ByRef rcRoi As tagRECT, ByVal w As Integer, ByVal h As Integer, ByVal PlateCharacters As System.IntPtr, ByRef rectPlateLocation As tagRECT, ByRef PlateReliability As Integer, ByVal nMod As Integer)
End Sub
把里面的Unknown换成你用的dll名称