在VB中，将数字或字符串转换为二进制的方法可分为以下两类，具体选择取决于输入类型：
一、将十进制数字转换为二进制
使用内置函数 - DecimalToBinary：
适用于十进制整数，直接调用函数即可。例如：
```vb
Sub DecimalToBinary()
Dim decimals() As Long = Array(10, 15, 20, 25)
Dim binary As String
For i = LBound(decimals) To UBound(decimals)
binary = binary & DecimalToBinary(decimals(i))
Debug.Print binary & " " & decimals(i)
Next i
End Sub
```
- HexToBin：通过十六进制转二进制，适用于需要二进制表示的十六进制数。例如：
```vb
Public Function HEX_to_BIN(ByVal Hex As String) As String
Dim i As Long, B As String
Hex = UCase(Hex)
For i = 1 To Len(Hex)
Select Case Mid(Hex, i, 1)
Case "0" To "9": B = B & Chr(48 + Val(Mid(Hex, i, 1)))
Case "A" To "F": B = B & Chr(75 + Val(Mid(Hex, i, 1)))
End Select
Next i
While Left(B, 1) = "0" B = Right(B, Len(B) - 1)
HEX_to_BIN = B
End Function
```
手动算法实现 
通过除2取余法，将十进制数转换为二进制字符串。例如：
```vb
Public Function Bin(num As Long) As String
Dim s As String, i As Long
s = ""
Do While num > 0
s = CStr(num Mod 2) & s
num = num 2
Loop
Return s
End Function
```
二、将字符串（如十六进制）转换为二进制
使用System.Convert类
在.NET framework中，可通过`System.Convert`类实现。例如：
```vb
Dim hexString As String = "1A3F"
Dim binaryString As String = System.Convert.ToString(Long.Parse(hexString), 2)
Debug.Print binaryString ' 输出: 1101000111111
```
逐字符转换
遍历字符串中的每个字符，将其转换为对应的二进制字符串并拼接。例如：
```vb
Public Function StringToBinary(ByVal input As String) As String
Dim binary As New StringBuilder
For Each c As Char In input.ToCharArray()
binary.Append(Format(CInt(c), "08b")) ' 每个字符转换为8位二进制
Next
Return binary.ToString()
End Function
```
注意事项
数据类型限制： 使用`DecimalToBinary`时，输入需为`Long`类型（最大值2147483647）；手动算法仅适用于非负整数。 进制转换