Ｃ＃ 中引用vb編寫的ＤＬＬ

 Private Declare Sub Make Lib "makebar.dll" _
(ucData As Byte, ByVal nLen As Long, ByVal szFileName As String, ByVal nClumn As Long, ByVal nErr As Long, ByVal nHLRatio As Long)

Dim a() As Byte
a = StrConv(Text1.Text, vbFromUnicode)
Make a(0), UBound(a) - LBound(a) + 1, "abc.bmp", CLng(Text2.Text), CLng(Text3.Text), CLng(Text4.Text)

C#
[DllImport("makebar.dll", EntryPoint="Make")]
private static extern void Make(ref byte ucData, long nLen, string szFileName, long nClumn, long nErr, long nHLRatio);

byte[] a = System.Text.Encoding.UTF8.GetBytes(Text1.Text);

Make(ref a[0], a.Length, "abc.bmp", long.Parse(Text2.Text), long.Parse(Text3.Text), long.Parse(Text4.Text);

其中對於那個ref參數我不是很確定。舊VB裡，不寫ByVal就是ByRef，但是好像在C#裡面ref只可以傳遞簡單的變數，例如a，而"a[0]"是沒辦法ref傳的。如果過程之後a[0]不需要改變，那就去掉那兩個ref就可以了