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：若需其他进制转换（如八进制、十六进制转二进制），可结合内置函数或手动算法实现。