锐客网

  1. 首页 > 睿知 > it技术 > >

vb.net的utf-8的简单介绍

IT技术String

VB UTF-8 问题Private Declare Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpDefaultChar As String, ByVal lpUsedDefaultChar As Long) As Long
Private Declare Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpMultiByteStr As Long, ByVal cchMultiByte As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long) As Long
Private Const CP_UTF8 = 65001
Function Utf8ToUnicode(ByRef Utf() As Byte) As String
Dim lRet As Long
Dim lLength As Long
Dim lBufferSize As Long
lLength = UBound(Utf) - LBound(Utf) + 1
If lLength = 0 Then Exit Function
lBufferSize = lLength * 2
Utf8ToUnicode = String$(lBufferSize, Chr(0))
lRet = MultiByteToWideChar(CP_UTF8, 0, VarPtr(Utf(0)), lLength, StrPtr(Utf8ToUnicode), lBufferSize)
If lRet0 Then
Utf8ToUnicode = Left(Utf8ToUnicode, lRet)
End If
End Function
【vb.net的utf-8的简单介绍】Private Sub Form_Load()
Dim a As String
Dim b() As Byte
Dim i As Integer
a = "E9 A2 91 E9 81 93 31 00"
ReDim b(UBound(Split(a, " ")) - 1) As Byte
For i = 0 To UBound(Split(a, " ")) - 1
b(i) = "H"Split(a, " ")(i)
Next i
Text1.Text = Utf8ToUnicode(b())
End Sub
vb.net 如何将编码GB2312转成UTF8Imports System.Text
Public Function StringAsUtf8Bytes(ByVal strData As String) As Byte()
Dim bytes() As Byte
bytes = Encoding.UTF8.GetBytes(strData)
Return bytes
End Function
说明：strData参数是GB2312字符串，函数返回UTF8字节数组
求教vb.net utf-8 解码Public Function GBKDecode(ByVal sInput As String) As String
sInput = sInput.Replace("%", "")
sInput = sInput.Replace(":", "")
Dim ret_GBKDecode As String = ""
Dim sLen As Integer = sInput.Length
Dim n As Integer = sLen \ 2
Dim sBytes(0 To n - 1) As Byte
'转化为字节码
For i As Integer = 1 To n
sBytes(i - 1) = CByte("H"sInput.Substring(2 * i - 2, 2))
Next
'将字节码转化为字符串
ret_GBKDecode = System.Text.Encoding.UTF8.GetString(sBytes)
Return ret_GBKDecode
End Function
'上面是函数，调用方法
MsgBox(GBKDecode(":%E9%80%81%E8%BE%BE%E6%97%A5%E6%9C%9F%20%E9%80%81%E8%BE%BE%E6%97%B6%E9%97%B4"))
gb2312>unicode>utf8，以及逆转的方法'>VB.net 字符转换问题 字符（汉字、数字、字母、符号）>gb2312>unicode>utf8 ，  以及逆转的方法字符编码转换吗?
1.字符与gb2312(gbk的子集)：
Public Function GBKEncode(ByVal sInput As String) As String
Dim ret_GBKEncode As String = ""
Dim i As Integer
Dim startIndex As Integer = 0
Dim endIndex As Integer
Dim x() As Byte = System.Text.Encoding.Default.GetBytes(sInput) '字符以及字符串在vb2008中都是以unicode编码存储的
endIndex = x.Length - 1
For i = startIndex To endIndex
ret_GBKEncode = "%"Hex(x(i))
Next
Return ret_GBKEncode
End Function
'GBK解码
Public Function GBKDecode(ByVal sInput As String) As String
sInput = sInput.Replace("%", "")
Dim ret_GBKDecode As String = ""
Dim sLen As Integer = sInput.Length
Dim n As Integer = sLen \ 2
Dim sBytes(0 To n - 1) As Byte
'转化为字节码
For i As Integer = 1 To n
sBytes(i - 1) = CByte("H"sInput.Substring(2 * i - 2, 2))
Next
'将字节码转化为字符串
ret_GBKDecode = System.Text.Encoding.Default.GetString(sBytes)
Return ret_GBKDecode
End Function
2.Unicode字符串为UTF-8
Imports System.Text
Public Function StringAsUtf8Bytes(ByVal strData As String) As Byte()
Dim bytes() As Byte
bytes = Encoding.UTF8.GetBytes(strData)

推荐阅读


上一篇：js字符串陷阱，js 字符串 slice

下一篇：微信直播白老师，微信出直播了