原代码如下：
Option Explicit

\'定义变量
Dim BIG5Data As Variant
Dim GBData As Variant

\'定义自定义类型，用来处理编码的高低字问题
Type ChineseTypeA
loChar As Byte
hiChar As Byte
End Type

Private BIG5Type(&HA1 To &HFF, &H40 To &HFE) As ChineseTypeA \'对应于BIG5字库
Private GBType(&HA7 To &HFF, &HA1 To &HFE) As ChineseTypeA \'对应与GB字库

\'//////////////////
\'公共函数开始
\'//////////////////

\'BIG5转换到GB的函数

Function BIG5TOGB(strSource As String) As String
Dim I As Long, Y As Long
\'定义数组，用来存放BIG5和GB内码数据
Dim bteBIG5() As Byte
Dim bteGB() As Byte

\'如果输入的内容为空，则退出函数
If strSource = "" Then
BIG5TOGB = ""
Exit Function
End If

\'将BIG5数组的类型从Unicode编码转换为系统缺省码
bteBIG5 = StrConv(strSource, vbFromUnicode)
\'确定BIG5数组的下标，用来循环将所有的BIG5内容转换为GB内码
Y = UBound(bteBIG5)
ReDim bteGB(0 To Y)
For I = 0 To Y
If I = Y Then
bteGB(I) = bteBIG5(I)
Exit For
End If
If bteBIG5(I) < &HA1 Or bteBIG5(I + 1) < &H40 Then
bteGB(I) = bteBIG5(I)
Else
bteGB(I) = BIG5Type(bteBIG5(I), bteBIG5(I + 1)).loChar
bteGB(I + 1) = BIG5Type(bteBIG5(I), bteBIG5(I + 1)).hiChar
I = I + 1
End If
Next I
\'将系统缺省码转换为Unicode编码
BIG5TOGB = StrConv(bteGB, vbUnicode)
\'重新初始化GB数组，以释放内存
Erase bteGB
End Function

\'GB转换到BIG5的函数

Function GBTOBIG5(strSource As String) As String
Dim I As Long, Y As Long
\'定义数组，用来存放BIG5和GB内码数据
Dim bteGB() As Byte
Dim bteBIG5() As Byte

\'如果输入的内容为空，则退出函数
If strSource = "" Then
GBTOBIG5 = ""
Exit Function
End If

\'将GB数组的类型从Unicode编码转换为系统缺省码
bteGB = StrConv(strSource, vbFromUnicode)
\'确定GB数组的下标，用来循环将所有的BIG5内容转换为GB内码
Y = UBound(bteGB)
ReDim bteBIG5(0 To Y)

For I = 0 To Y
If I = Y Then
bteBIG5(I) = bteGB(I)
Exit For
End If
If bteGB(I) < &HA1 Or bteGB(I + 1) < &HA1 Then
bteBIG5(I) = bteGB(I)
Else
If bteGB(I) < &HB0 And bteGB(I + 1) >= &HA1 Then
bteBIG5(I) = GBType(bteGB(I) + 6, bteGB(I + 1)).loChar
bteBIG5(I + 1) = GBType(bteGB(I) + 6, bteGB(I + 1)).hiChar
Else
bteBIG5(I) = GBType(bteGB(I), bteGB(I + 1)).loChar
bteBIG5(I + 1) = GBType(bteGB(I), bteGB(I + 1)).hiChar
End If
I = I + 1
End If
Next I
\'将系统缺省码转换为Unicode编码
GBTOBIG5 = StrConv(bteBIG5, vbUnicode)
\'重新初始化BIG5数组，以释放内存
Erase bteBIG5
End Function

\'//////////////////
\'公共函数结束
\'//////////////////

\'类初始化
Private Sub Class_Initialize()
Dim I As Long
Dim J As Long
Dim iLen As Long

\'从资源文件中读取GB与BIG5的字库
GBData = LoadResData(102, "CUSTOM") \'//读取GB字库
BIG5Data = LoadResData(101, "CUSTOM") \'//读取BIG5字库

For I = &HA1 To &HFE
For J = &H40 To &HFE
BIG5Type(I, J).loChar = BIG5Data(iLen)
BIG5Type(I, J).hiChar = BIG5Data(iLen + 1)
iLen = iLen + 2
Next J
Next I

iLen = 0

For I = &HA7 To &HFE
For J = &HA1 To &HFE
GBType(I, J).loChar = GBData(iLen)
GBType(I, J).hiChar = GBData(iLen + 1)
iLen = iLen + 2
Next J
Next I
End Sub