怎麼用vb6載入非vb做出的dll(編號:4539)

我用下面的方法,可是run的時候會有錯誤:can't find entry point SomeFunc in SomeDLL.dll
不知道是不是我的語法還是什麼有問題呀
我想要include的這個dll可以用c來include
那該如何用vb來載入呢?
Private Declare Function SomeFunc Lib "SomeDLL.dll" (ByVal DATA1 As Long, ByVal DATA2 As String) As Integer