如何从函数返回值

Question

如何从函数

返回值

代码

Private Function LeaveCheck(empid As String)
    Dim rdoRs1 As rdoResultset
    Dim desc As String
    Dim sSQL As String
    sSQL = "Select name from table1 wher empcode = '" & empid & "'"
    Set rdoRs1 = Rdoconn.OpenResultset(sSQL, rdOpenStatic)
    If rdoRs1.RowCount > 0 Then
    desc = rdors1!name        
    return desc 'Showing error in this line    
    End If
    rdoRs1.Close
End Function

如何从上面的代码中返回值。

需要Vb6代码帮助

Answer 1

您需要指定退货类型。

Private Function LeaveCheck(empid As String) As String ' Notice the As String
    Dim rdoRs1 As rdoResultset  
    Dim desc As String  
    Dim sSQL As String  
    sSQL = "Select name from table1 wher empcode = '" & empid & "'"  
    Set rdoRs1 = Rdoconn.OpenResultset(sSQL, rdOpenStatic)  
    If rdoRs1.RowCount > 0 Then  
        desc = rdors1!name          
    End If  
    rdoRs1.Close  

    LeaveCheck = desc ' This will be blank or populated
End Function

这是一个link，对于理解VB6中的函数是一个很好的阅读

修改

阅读完评论后，我会创建一个类来存储您的值。

Public Class MyClass
    Dim name As String
    Dim dept As String
    Dim country As String
End Class

然后，您可以在代码中实例化此类的新实例：

Private Function LeaveCheck(empid As String) As MyClass
    Dim myClass As New MyClass
    Dim rdoRs1 As rdoResultset
    Dim sSQL As String   
    sSQL = "Select name, dept, country from table1 wher empcode = '" & empid & "'"   
    Set rdoRs1 = Rdoconn.OpenResultset(sSQL, rdOpenStatic)   
    If rdoRs1.RowCount > 0 Then   
        myClass.name = rdors1!name           
        myClass.dept = rdors1!dept
        myClass.country = rdors1!country
    End If   
    rdoRs1.Close   

    LeaveCheck = myClass
End Function

Answer 2

您需要将值设置为函数名称和返回类型：

Private Function LeaveCheck(empid As String) As String
    Dim rdoRs1 As rdoResultset
    Dim desc As String
    Dim sSQL As String
    sSQL = "Select name from table1 wher empcode = '" & empid & "'"
    Set rdoRs1 = Rdoconn.OpenResultset(sSQL, rdOpenStatic)
    If rdoRs1.RowCount > 0 Then
      desc = rdors1!name        
    End If
    rdoRs1.Close

    LeaveCheck = desc

End Function

有关详细信息，请参阅this document。

Answer 3

Function returnArray() As Variant
   RTA[ab]=0
   if a=b then RTA[ab]=1

   RTA[xy]=0
   if a=b then RTA[xy]=1

   returnArray=RTA
end function