vb 读取内存的,请帮我看看为什么都是返回0?

Public Function ChaXunDiZhi() As String
Dim nr As Long
Dim dz As Long
Dim i As Long
Dim t1 As String

t1 = ""
Debug.Print "开始了"
For dz = 0 To 999999999
    ChaXunNeiCun nr, dz
    If nr <> 0 Then
        Debug.Print dz & " : " & nr ' & " - " & Chr(nr)
        t1 = t1 & dz & " : " & nr & vbCrLf ' & " - " & Chr(nr)
        Beep 500, 500
    End If
    If dz Mod 10000000 = 0 Then
        Debug.Print dz
        DoEvents
    End If
Next
Debug.Print "结束了"

ChaXunDiZhi = t1
End Function

Public Function ChaXunNeiCun(nr As Long, dz As Long) As Boolean
Dim h As Long
Dim sf As Long

If h1_1 = 0 Then
    GetWindowThreadProcessId h1, h
    If h > 0 Then
        h1_1 = OpenProcess(PROCESS_ALL_ACCESS, 0, h)
    End If
End If
If h1_1 = 0 Then
    ChaXunNeiCun = False
    Exit Function
End If

sf = ReadProcessMemory(h1_1, ByVal dz, ByVal VarPtr(nr), 4, 0&)
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