获取字符码值大于十六进制`FFFF`的 Unicode 字符 [英] Get Unicode characters with charcode values greater hex `FFFF`
问题描述
问题
ChrW
charcode 参数是一个 Long
标识一个字符,但不允许大于 65535 的值(十六进制值 &HFFFF
) -请参阅
Issue
The ChrW
charcode argument is a Long
that identifies a character, but doesn't allow values greater than 65535 (hex value &HFFFF
) -
see MS Help.
For instance Miscellaneous symbols and pictographs can be found at Unicode hex block 1F300-1F5FF
. So I didn't find any way to represent the proposed hex values of ►1F512
and 1F513
for a opened or closed padlock symbol
precisely in this charcode block, as of Course ChrW(&H1F512)
would result in an invalid procedure/argument call.
A recent answer found an possibly erratic alternative referring to a lower charcode
(via ChrW(&HE1F7)
and ChrW(&HE1F6)
), but I'm searching for a way to get the higher charcode representation.
Question
Is there a systematic way to express Unicode characters found in hexadecimal code blocks greater than FFFF
by means of VBA or a work around?
Something like this should work. Most code I didn't write, but I knew what to look for. Basically map the Hex to the byte array equivalent, then get the string back.
Option Explicit
'Pulled from https://www.di-mgt.com.au/howto-convert-vba-unicode-to-utf8.html
''' Maps a character string to a UTF-16 (wide character) string
Private Declare PtrSafe Function MultiByteToWideChar Lib "kernel32" ( _
ByVal CodePage As Long, _
ByVal dwFlags As Long, _
ByVal lpMultiByteStr As LongPtr, _
ByVal cchMultiByte As Long, _
ByVal lpWideCharStr As LongPtr, _
ByVal cchWideChar As Long _
) As Long
' CodePage constant for UTF-8
Private Const CP_UTF8 = 65001
''' Return length of byte array or zero if uninitialized
Private Function BytesLength(abBytes() As Byte) As Long
' Trap error if array is uninitialized
On Error Resume Next
BytesLength = UBound(abBytes) - LBound(abBytes) + 1
End Function
''' Return VBA "Unicode" string from byte array encoded in UTF-8
Public Function Utf8BytesToString(abUtf8Array() As Byte) As String
Dim nBytes As Long
Dim nChars As Long
Dim strOut As String
Utf8BytesToString = ""
' Catch uninitialized input array
nBytes = BytesLength(abUtf8Array)
If nBytes <= 0 Then Exit Function
' Get number of characters in output string
nChars = MultiByteToWideChar(CP_UTF8, 0&, VarPtr(abUtf8Array(0)), nBytes, 0&, 0&)
' Dimension output buffer to receive string
strOut = String(nChars, 0)
nChars = MultiByteToWideChar(CP_UTF8, 0&, VarPtr(abUtf8Array(0)), nBytes, StrPtr(strOut), nChars)
Utf8BytesToString = Left$(strOut, nChars)
End Function
'Grabbed from https://stackoverflow.com/questions/28798759/how-convert-hex-string-into-byte-array-in-vb6
Private Function HexToBytes(ByVal HexString As String) As Byte()
'Quick and dirty hex String to Byte array. Accepts:
'
' "HH HH HH"
' "HHHHHH"
' "H HH H"
' "HH,HH, HH" and so on.
Dim Bytes() As Byte
Dim HexPos As Integer
Dim HexDigit As Integer
Dim BytePos As Integer
Dim Digits As Integer
ReDim Bytes(Len(HexString) 2) 'Initial estimate.
For HexPos = 1 To Len(HexString)
HexDigit = InStr("0123456789ABCDEF", _
UCase$(Mid$(HexString, HexPos, 1))) - 1
If HexDigit >= 0 Then
If BytePos > UBound(Bytes) Then
'Add some room, we'll add room for 4 more to decrease
'how often we end up doing this expensive step:
ReDim Preserve Bytes(UBound(Bytes) + 4)
End If
Bytes(BytePos) = Bytes(BytePos) * &H10 + HexDigit
Digits = Digits + 1
End If
If Digits = 2 Or HexDigit < 0 Then
If Digits > 0 Then BytePos = BytePos + 1
Digits = 0
End If
Next
If Digits = 0 Then BytePos = BytePos - 1
If BytePos < 0 Then
Bytes = "" 'Empty.
Else
ReDim Preserve Bytes(BytePos)
End If
HexToBytes = Bytes
End Function
Example call
Public Sub ExampleLock()
Dim LockBytes() As Byte
LockBytes = HexToBytes("F0 9F 94 92") ' Lock Hex representation, found by -->http://www.ltg.ed.ac.uk/~richard/utf-8.cgi
Sheets(1).Range("A1").Value = Utf8BytesToString(LockBytes) ' Output
End Sub
Here's what is outputting to A1.
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