vb 调用delphi dll文件
delphi中的dll文件，有个函数，addnumber，就是求2个数的和我在vb中是这样调用的：
Private Declare Sub AddNumber Lib "TestDll.dll" (x As Integer, y As Integer)
Private Sub Command1_Click()
Dim a As Integer
Dim b As Integer
Dim sum As Integer
a = Text1.Text
b = Text2.Text
Call AddNumber(a, b)
End Sub
这样好像不报错，可是我要在text3中得到text1和text2的和，接下来怎么做，教教
