String 随机化字符串大小写的最快方法
对于一些协议测试，我需要将许多字符串中每个字符的大小写随机化。 字符串是由我的应用程序创建的命令，将通过winsock控件发送到客户端 因为它涉及很多弦，我希望每个部分都尽可能快 现在我有：String 随机化字符串大小写的最快方法,string,optimization,random,vb6,String,Optimization,Random,Vb6,对于一些协议测试，我需要将许多字符串中每个字符的大小写随机化。 字符串是由我的应用程序创建的命令，将通过winsock控件发送到客户端 因为它涉及很多弦，我希望每个部分都尽可能快 现在我有： Private Function RandomCaps(strText As String) As String Dim lngChar As Long Dim strLower As String, strUpper As String Dim strRandom As String st
Private Function RandomCaps(strText As String) As String
Dim lngChar As Long
Dim strLower As String, strUpper As String
Dim strRandom As String
strRandom = ""
strLower = LCase$(strText)
strUpper = UCase$(strText)
For lngChar = 1 To Len(strText)
If Int(2 * Rnd) = 0 Then
strRandom = strRandom & Mid$(strLower, lngChar, 1)
Else
strRandom = strRandom & Mid$(strUpper, lngChar, 1)
End If
Next lngChar
RandomCaps = strRandom
End Function
Public Type TUDTPtr
pSA As Long
Reserved As Long ' z.B. für vbVarType oder IRecordInfo
cDims As Integer
fFeatures As Integer
cbElements As Long
cLocks As Long
pvData As Long
cElements As Long
lLBound As Long
End Type
Public Type TCharPointer
pudt As TUDTPtr
Chars() As Integer
End Type
Public Enum SAFeature
FADF_AUTO = &H1
FADF_STATIC = &H2
FADF_EMBEDDED = &H4
FADF_FIXEDSIZE = &H10
FADF_RECORD = &H20
FADF_HAVEIID = &H40
FADF_HAVEVARTYPE = &H80
FADF_BSTR = &H100
FADF_UNKNOWN = &H200
FADF_DISPATCH = &H400
FADF_VARIANT = &H800
FADF_RESERVED = &HF008
End Enum
Public Declare Sub RtlMoveMemory Lib "kernel32" ( _
ByRef pDst As Any, _
ByRef pSrc As Any, _
ByVal bLength As Long)
Public Declare Sub RtlZeroMemory Lib "kernel32" ( _
ByRef pDst As Any, _
ByVal bLength As Long)
Public Declare Function ArrPtr Lib "msvbvm60" _
Alias "VarPtr" ( _
ByRef pArr() As Any) As Long
Public Sub New_UDTPtr(ByRef this As TUDTPtr, _
ByVal Feature As SAFeature, _
ByVal bytesPerElement As Long, _
Optional ByVal CountElements As Long = 1, _
Optional ByVal lLBound As Long = 0)
With this
.pSA = VarPtr(.cDims)
.cDims = 1
.cbElements = bytesPerElement
.fFeatures = CInt(Feature)
.cElements = CountElements
.lLBound = lLBound
End With
End Sub
Public Sub New_CharPointer(ByRef this As TCharPointer, ByRef StrVal As String)
With this
Call New_UDTPtr(.pudt, FADF_AUTO Or FADF_FIXEDSIZE, 2, Len(StrVal), 1)
With .pudt
.pvData = StrPtr(StrVal)
End With
Call RtlMoveMemory(ByVal ArrPtr(.Chars), ByVal VarPtr(.pudt), 4)
End With
End Sub
Public Sub DeleteCharPointer(ByRef this As TCharPointer)
With this
Call RtlZeroMemory(ByVal ArrPtr(.Chars), 4)
End With
End Sub
Private Sub RandomCapsX(strText As String) 'As String
Dim i As Long
Dim p As TCharPointer: Call MCharPointer.New_CharPointer(p, strText)
For i = 1 To p.pudt.cElements
Select Case p.Chars(i)
Case 65 To 90
'Uppercase
p.Chars(i) = p.Chars(i) + Int(2 * Rnd) * 32
Case 97 To 122
'lowercase
p.Chars(i) = p.Chars(i) - Int(2 * Rnd) * 32
End Select
Next
Call MCharPointer.DeleteCharPointer(p)
End Sub
使用
MidPrivate Function RandomCaps(s As String) As String
Dim uc As String
Dim i As Long
RandomCaps = LCase$(s)
uc = UCase$(s)
For i = 1 To Len(s)
If Rnd < 0.5 Then
Mid(RandomCaps, i, 1) = Mid(uc, i, 1)
End If
Next i
End Function
私有函数RandomCaps（作为字符串）作为字符串
将uc设置为字符串
我想我会坚持多久
RandomCaps=LCase$（s）
uc=UCase$（s）
对于i=1到Len（s）
如果Rnd<0.5，则
Mid（随机上限，i，1）=Mid（uc，i，1）
如果结束
接下来我
端函数
您可以尝试使用
MidBPrivate Function RandomCaps(s As String) As String
Dim i As Long
RandomCaps = LCase$(s)
For i = 1 To Len(s)
If Rnd < 0.5 Then
Mid(RandomCaps, i, 1) = UCase(Mid(RandomCaps, i, 1))
End If
Next i
End Function
Private Function RandomCaps(s As String) As String
Dim b() As Byte
b = StrConv(Text1.Text, vbFromUnicode)
Dim i As Long
For i = 0 To UBound(b) - 1
If Rnd < 0.5 Then
If UCase(Chr(b(i))) = Chr(b(i)) Then
'original char is uppercase, make it lowercase
b(i) = Asc(LCase(Chr(b(i))))
Else
'original char is lowercase, make it uppercase
b(i) = Asc(UCase(Chr(b(i))))
End If
End If
Next i
RandomCaps = StrConv(b, vbUnicode)
End Function
Private Function RandomCaps(s As String) As String
Dim b() As Byte
b = StrConv(Text1.Text, vbFromUnicode)
Dim i As Long
For i = 0 To UBound(b) - 1
If Rnd < 0.5 Then
If b(i) >= 64 And b(i) <= 90 Then
'A to Z
b(i) = b(i) + 32
ElseIf b(i) >= 97 And b(i) <= 122 Then
'a to z
b(i) = b(i) - 32
Else
'everything else
End If
End If
Next i
RandomCaps = StrConv(b, vbUnicode)
End Function
私有函数RandomCaps（作为字符串）作为字符串
我想我会坚持多久
RandomCaps=LCase$（s）
对于i=1到Len（s）
如果Rnd<0.5，则
Mid（RandomCaps，i，1）=UCase（Mid（RandomCaps，i，1））
如果结束
接下来我
端函数
Private Function RandomCaps(s As String) As String
Dim i As Long
RandomCaps = LCase$(s)
For i = 1 To Len(s)
If Rnd < 0.5 Then
Mid(RandomCaps, i, 1) = UCase(Mid(RandomCaps, i, 1))
End If
Next i
End Function
Private Function RandomCaps(s As String) As String
Dim b() As Byte
b = StrConv(Text1.Text, vbFromUnicode)
Dim i As Long
For i = 0 To UBound(b) - 1
If Rnd < 0.5 Then
If UCase(Chr(b(i))) = Chr(b(i)) Then
'original char is uppercase, make it lowercase
b(i) = Asc(LCase(Chr(b(i))))
Else
'original char is lowercase, make it uppercase
b(i) = Asc(UCase(Chr(b(i))))
End If
End If
Next i
RandomCaps = StrConv(b, vbUnicode)
End Function
Private Function RandomCaps(s As String) As String
Dim b() As Byte
b = StrConv(Text1.Text, vbFromUnicode)
Dim i As Long
For i = 0 To UBound(b) - 1
If Rnd < 0.5 Then
If b(i) >= 64 And b(i) <= 90 Then
'A to Z
b(i) = b(i) + 32
ElseIf b(i) >= 97 And b(i) <= 122 Then
'a to z
b(i) = b(i) - 32
Else
'everything else
End If
End If
Next i
RandomCaps = StrConv(b, vbUnicode)
End Function
私有函数RandomCaps（作为字符串）作为字符串
Dim b（）作为字节
b=StrConv（Text1.Text，vbFromUnicode）
我想我会坚持多久
对于i=0到UBound（b）-1
如果Rnd<0.5，则
如果UCase（Chr（b（i））=Chr（b（i）），那么
'原始字符为大写，请将其设置为小写
b（i）=Asc（LCase（Chr（b（i）））
其他的
'原始字符是小写的，请使用大写
b（i）=Asc（UCase（Chr（b（i）））
如果结束
如果结束
接下来我
RandomCaps=StrConv（b，vbUnicode）
端函数
Private Function RandomCaps(s As String) As String
Dim i As Long
RandomCaps = LCase$(s)
For i = 1 To Len(s)
If Rnd < 0.5 Then
Mid(RandomCaps, i, 1) = UCase(Mid(RandomCaps, i, 1))
End If
Next i
End Function
Private Function RandomCaps(s As String) As String
Dim b() As Byte
b = StrConv(Text1.Text, vbFromUnicode)
Dim i As Long
For i = 0 To UBound(b) - 1
If Rnd < 0.5 Then
If UCase(Chr(b(i))) = Chr(b(i)) Then
'original char is uppercase, make it lowercase
b(i) = Asc(LCase(Chr(b(i))))
Else
'original char is lowercase, make it uppercase
b(i) = Asc(UCase(Chr(b(i))))
End If
End If
Next i
RandomCaps = StrConv(b, vbUnicode)
End Function
Private Function RandomCaps(s As String) As String
Dim b() As Byte
b = StrConv(Text1.Text, vbFromUnicode)
Dim i As Long
For i = 0 To UBound(b) - 1
If Rnd < 0.5 Then
If b(i) >= 64 And b(i) <= 90 Then
'A to Z
b(i) = b(i) + 32
ElseIf b(i) >= 97 And b(i) <= 122 Then
'a to z
b(i) = b(i) - 32
Else
'everything else
End If
End If
Next i
RandomCaps = StrConv(b, vbUnicode)
End Function
私有函数RandomCaps（作为字符串）作为字符串
Dim b（）作为字节
b=StrConv（Text1.Text，vbFromUnicode）
我想我会坚持多久
对于i=0到UBound（b）-1
如果Rnd<0.5，则
若b（i）>=64和b（i），若您使用ASCII大小写范围（65-90，97-122）并通过加/减32转换大小写，您的第二个代码示例将变得更快，并且对于大于约100个字符的字符串，性能优于我的答案。我将使用ASCII范围进行简短测试谢谢！也感谢您的全面测试！字符串的长度将从4到255个字符，大多数字符串的长度约为10个字符，因此我也将在程序中进行一些测试，并选择最快的代码：）谢谢！我总是忘记我也可以在左手边使用mid$（），这已经让它快了很多：）谢谢！目前，我将使用乔治答案中的代码。但是，请保存您的代码，以便稍后我进行一些微调，并尝试最大限度地提高其速度。也许您不需要它，因为在我的机器上它只比以前快10-20%。但一定要了解它是如何工作的。如果你想尝试，你必须在RandomCaps之外定义TCharpointer。谢谢你会使用它，也是因为我对它的工作原理很好奇：）不要忘记在最后调用DeleteCharPointer，可能是以表单卸载，否则它可能会崩溃。这种技术的好处是您可以直接访问VB（BSTR）的unicode字符。（如果需要）