请各位看下,为什么 这段麻烦会报内存错误这是正确的:Public Function AddVar(Dat() As Byte, Count As Lon
请各位看下,为什么 这段麻烦会报内存错误
这是正确的:
Public Function AddVar(Dat() As Byte, Count As Long, ByVal Var As Variant)
Dim Ty As VbVarType
Dim Vint As Integer
Dim Vlng As Long
Dim Vsin As Single
Dim Vdub As Double
Ty = VarType(Var)
If Ty = vbByte Then
ReDim Preserve Dat(Count)
Dat(Count) = Var
Count = Count + 1
ElseIf Ty = vbInteger Then
Vint = Var
ReDim Preserve Dat(Count + LenB(Vint) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal VarPtr(Vint), LenB(Vint)
Count = Count + LenB(Vint)
ElseIf Ty = vbVLong Then
Vlng = Var
ReDim Preserve Dat(Count + LenB(Vlng) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal VarPtr(Vlng), LenB(Vlng)
Count = Count + LenB(Vlng)
ElseIf Ty = vbSingle Then
Vsin = Var
ReDim Preserve Dat(Count + LenB(Vsin) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal VarPtr(Vsin), LenB(Vsin)
Count = Count + LenB(Vsin)
ElseIf Ty = vbDouble Then
Vdub = Var
ReDim Preserve Dat(Count + LenB(Vdub) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal VarPtr(Vdub), LenB(Vdub)
Count = Count + LenB(Vdub)
End If
End Function
下面这个是错误的
Public Function AddVar(Dat() As Byte, Count As Long, ByVal Var As Variant)
Dim Ty As VbVarType
Dim Vint As Integer
Dim Vlng As Long
Dim Vsin As Single
Dim Vdub As Double
Ty = VarType(Var)
If Ty = vbByte Then
ReDim Preserve Dat(Count)
Dat(Count) = Var
Count = Count + 1
ElseIf Ty = vbInteger Then
Vint = Var
ReDim Preserve Dat(Count + LenB(Vint) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal Vint, LenB(Vint)
Count = Count + LenB(Vint)
ElseIf Ty = vbVLong Then
Vlng = Var
ReDim Preserve Dat(Count + LenB(Vlng) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal Vlng, LenB(Vlng)
Count = Count + LenB(Vlng)
ElseIf Ty = vbSingle Then
Vsin = Var
ReDim Preserve Dat(Count + LenB(Vsin) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal Vsin, LenB(Vsin)
Count = Count + LenB(Vsin)
ElseIf Ty = vbDouble Then
Vdub = Var
ReDim Preserve Dat(Count + LenB(Vdub) - 1)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal Vdub, LenB(Vdub)
Count = Count + LenB(Vdub)
End If
End Function
这是两段代码唯一的不同为什么我加上了VarPtr就行呢????
CopyMemory ByVal VarPtr(Dat(Count)), ByVal VarPtr(Vlng), LenB(Vlng)
CopyMemory ByVal VarPtr(Dat(Count)), ByVal Vlng, LenB(Vdub)
下面这段MoveMemory 是代码也是正确的,也没有加上VarPtr
MoveMemory U_CmdS(Index), U_CmdS(Index + 1), (U_Count - Index - 1) * Len(U_AutoCmd)
求指教谢谢
[解决办法]
问题在于你的CompyMemory的声明上面
参阅
重点看看CopyMemory的声明
[解决办法]
VarPtr是读取变量的地址,而CopyMemory需要传入的是地址,所以,必须加上VarPtr
