本示例使用的发卡器：https://item.taobao.com/item.htm?ft=t&id=615391857885 

一、读取旧Ntag卡的UID和数据

    Private Sub Button15_Click(sender As Object, e As EventArgs) Handles Button15.Click'轻松读卡'技术支持:'网站:Dim i, j As IntegerDim cardidhex, authkey, Str As StringDim status, myctrlword, comedc As Byte '存放返回值Dim mypiccserial(7) As Byte '卡序列号Dim mypicckey(0 To 3) As Byte '认证密码Dim mypiccdata(0 To 3) As Byte '读卡的数据缓冲，Ultralight卡及NTAG21x卡的数组长度必须为16个字节，写卡的为4个字节Dim piccdata(0 To 8191) As ByteDim myblockaddr As Byte '起始块地址Dim myblocksize As Byte '总块数If CheckBox3.Checked ThenIf Len(Trim(TextBox7.Text)) < 8 Theni = MsgBox("卡认证密码位数不足！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")If i <> vbOK ThenTextBox7.Select()Exit SubEnd IfElseauthkey = Trim(TextBox7.Text)For i = 0 To 3mypicckey(i) = CByte("&H" & Mid(authkey, i * 2 + 1, 2))NextEnd Ifmyctrlword = &H10  '需要认证卡密码后再继续Elsemyctrlword = 0End Ifmyblockaddr = CByte(rwbeginp.Value)myblocksize = CByte(rwps.Value)j = 0For i = myblockaddr To myblockaddr + myblocksize - 1status = piccreadex_ntag(myctrlword, mypiccserial(0), mypicckey(0), i, 1, mypiccdata(0))If status = 0 Thenpiccdata(j * 4 + 0) = mypiccdata(0)piccdata(j * 4 + 1) = mypiccdata(1)piccdata(j * 4 + 2) = mypiccdata(2)piccdata(j * 4 + 3) = mypiccdata(3)j = j + 1ElseExit ForEnd IfNextSelect Case statusCase 0pcdbeep(50)cardidhex = ""For i = 0 To 6cardidhex = cardidhex + Strings.Right("00" + Hex(mypiccserial(i)), 2)NextTextBox8.Text = cardidhexcardidhex = ""For i = 0 To myblocksize * 4 - 1cardidhex = cardidhex + Strings.Right("00" + Hex(piccdata(i)), 2)NextRichTextBox1.Text = cardidhexlcddispfull("读卡成功！                        ")MsgBox("读卡成功！", MsgBoxStyle.Information + MsgBoxStyle.OkOnly, "提示")Case 8lcddispfull("请将卡放在感应区！                        ")MsgBox("请将卡放在感应区！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case 12lcddispfull("读块" + Convert.ToString(i) + "失败，密码错误！                       ")MsgBox("读块" + Convert.ToString(i) + "失败，密码错误！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case 13lcddispfull("读块" + Convert.ToString(i) + "失败，可能需要验证密码！                       ")MsgBox("读块" + Convert.ToString(i) + "失败，可能需要验证密码！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case 23MsgBox("请连上USB读写器！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case Elselcddispfull("读块" + Convert.ToString(i) + "时操作异常，返回代码：" + Convert.ToString(status) + "                        ")MsgBox("读块" + Convert.ToString(i) + "时操作异常，返回代码：" + Convert.ToString(status), MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")End SelectEnd Sub

二、将读取的UID和数据写入新标签

    Private Sub Button16_Click(sender As Object, e As EventArgs) Handles Button16.Click'技术支持:'网站:Dim i, j As IntegerDim cardidhex, authkey, Str, writstr As StringDim status, myctrlword, comedc As Byte '存放返回值Dim mypiccserial(7) As Byte '卡序列号Dim mypicckey(0 To 3) As Byte '认证密码Dim mypiccdata(0 To 3) As Byte '写卡的为4个字节Dim myblockaddr As Byte '起始块地址Dim myblocksize As Byte '总块数Dim piccdata(0 To 8100) As ByteDim rwlen As IntegerIf rwps.Value < 1 ThenMsgBox("写卡页数必须大于0！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Exit SubEnd Ifmyblockaddr = CByte(rwbeginp.Value)myblocksize = CByte(rwps.Value)If CheckBox3.Checked ThenIf Len(Trim(TextBox7.Text)) < 8 Theni = MsgBox("卡认证密码位数不足！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")If i <> vbOK ThenTextBox7.Select()Exit SubEnd IfElseauthkey = Trim(TextBox7.Text)For i = 0 To 3mypicckey(i) = CByte("&H" & Mid(authkey, i * 2 + 1, 2))NextEnd Ifmyctrlword = &H10  '需要认证卡密码后再继续Elsemyctrlword = 0End Ifrwlen = myblocksize * 4If Not checkhexstr(RichTextBox1.Text.Trim(), rwlen, piccdata) ThenMessageBox.Show("写卡信息不足,建议先读取对应块内数据后再改写！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error)ReturnEnd Ifj = 0For i = myblockaddr To myblockaddr + myblocksize - 1mypiccdata(0) = piccdata(j * 4 + 0)mypiccdata(1) = piccdata(j * 4 + 1)mypiccdata(2) = piccdata(j * 4 + 2)mypiccdata(3) = piccdata(j * 4 + 3)If i = 2 Thenmypiccdata(2) = 0mypiccdata(3) = 0status = picclock_ntag(0, mypiccdata(0))   '2块的后两个字节是静态锁Elsestatus = piccwriteex_ntag(myctrlword, mypiccserial(0), mypicckey(0), i, 1, mypiccdata(0))End IfIf status = 0 Thenj = j + 1ElseExit ForEnd IfNextSelect Case statusCase 0pcdbeep(50)cardidhex = ""For i = 0 To 6cardidhex = cardidhex + Strings.Right("00" + Hex(mypiccserial(i)), 2)NextTextBox8.Text = cardidhexlcddispfull("写卡成功！                        ")MsgBox("写卡成功！", MsgBoxStyle.Information + MsgBoxStyle.OkOnly, "提示")Case 8lcddispfull("请将卡放在感应区！                        ")MsgBox("请将卡放在感应区！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case 12lcddispfull("写块" + Convert.ToString(i) + "时失败，卡密码错误！                        ")MsgBox("写块" + Convert.ToString(i) + "时失败，卡密码错误！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case 14lcddispfull("写块" + Convert.ToString(i) + "时失败，可能需要验证密码或页已经锁定！                        ")MsgBox("写块" + Convert.ToString(i) + "时失败，可能需要验证密码或页已经锁定！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case 23MsgBox("请连上USB读写器！", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")Case Elselcddispfull("写块" + Convert.ToString(i) + "时操作异常，代码：" + Convert.ToString(status) + "                        ")MsgBox("写块" + Convert.ToString(i) + "时操作异常，返回代码：" + Convert.ToString(status), MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "提示")End SelectEnd Sub