一、在XXX.def中加入(假设工程名叫XXX,要输出的函数名叫MyDLLFunc())




二、在XXX.cpp中写函数的定义













三、在VB中调用
Public Declare Function MyDLLFunc Lib "C:/yyy/xxx.dll" (ByVal inputStr As String, ByRef outputStr As String) As Boolean
Sub M1() ' 其实是个宏 -_-
Dim mystr As String * 4096
If MyDLLFunc("ABC", mystr) Then
MsgBox sss
End If
End Sub