Structure中定义的数组,为什么在使用时为Nothing
Structure Dll_list
Dim ncomp As Long
Dim feed() As Double
Dim t As Double
Dim p As Double
End Structure Function gmps_AirPropertyH2O(ByVal t As Double, ByVal p As Double, ByVal xH2O As Double, ByVal xN2 As Double, ByVal xO2 As Double, ByVal xAr As Double) As Object Dim GMPS As Dll_list = New Dll_list
GMPS.t = t
GMPS.p = p
GMPS.ncomp = 4
GMPS.feed(1) = xN2
GMPS.feed(2) = xAr
GMPS.feed(3) = xO2
GMPS.feed(4) = xH2OEnd FunctionGMPS.feed(1)到feed(4)的值都为nothing,不是不要先赋初值?怎么赋?
Structure Dll_list
Dim ncomp As Long
Dim feed() As Double
Dim t As Double
Dim p As Double
End Structure Function gmps_AirPropertyH2O(ByVal t As Double, ByVal p As Double, ByVal xH2O As Double, ByVal xN2 As Double, ByVal xO2 As Double, ByVal xAr As Double) As Object Dim GMPS As Dll_list = New Dll_list
GMPS.t = t
GMPS.p = p
GMPS.ncomp = 4
GMPS.feed(1) = xN2
GMPS.feed(2) = xAr
GMPS.feed(3) = xO2
GMPS.feed(4) = xH2OEnd FunctionGMPS.feed(1)到feed(4)的值都为nothing,不是不要先赋初值?怎么赋?
redim
ReDim GMPS.feed(4) '加上这句试试
GMPS.t = t
GMPS.p = p
GMPS.ncomp = 4
GMPS.feed(1) = xN2
GMPS.feed(2) = xAr
GMPS.feed(3) = xO2
GMPS.feed(4) = xH2OEnd Function
Structure Dll_list
Dim ncomp As Long
Dim feed(4) As Double
Dim t As Double
Dim p As Double
End Structure
或Dim feed(3) As Double
redim同dim