[英]faster way to convert byte array into binary in vb?
我想將字節數組轉換為二進制,例如:“ 01010101”。 使用小文件,它可以轉換而沒有任何問題,但是轉換大文件花的時間太長了(即使僅5mb,我也無法想象會有更大的文件)。 有沒有更快的方法將此字節數組轉換為二進制,反之亦然? 這是我的代碼
Public Function conv_FileToByte(ByVal filename As String)
Dim convFileToByte_array() As Byte
Dim fs As New FileStream(filename, FileMode.Open, FileAccess.Read)
Dim fileData As Byte() = New Byte(fs.Length - 1) {}
Console.WriteLine("reading file data")
fs.Read(fileData, 0, Convert.ToInt32(fs.Length))
fs.Close()
Console.WriteLine("close stream")
convFileToByte_array = fileData
Console.WriteLine("Returning value")
Return convFileToByte_array
End Function
Public Function conv_ByteToBin(ByVal conv() As Byte)
'Dim newBin As New List(Of String)
Dim newBin As String = Nothing
For Each c In conv
'newBin.Add(Convert.ToString(c, 2).PadLeft(8, "0"))
Dim temp_bin As String
temp_bin = Convert.ToString(c, 2).PadLeft(8, "0")
newBin = newBin & temp_bin
Next
Console.WriteLine("Returning value")
Return newBin
End Function
Public Function conv_BinToByte(ByVal binValue As String)
Dim count_binValue As String = binValue.Count
Dim temp_binValue As New List(Of String)
Dim bins As New Byte()
Dim binlist As New List(Of Byte)
For i As Integer = 0 To count_binValue - 1 Step 8
Dim temp_value As String
temp_value = binValue.Substring(i, 8)
Dim convert_temp As String
convert_temp = Convert.ToInt32(temp_value, 2)
temp_binValue.Add(convert_temp)
Next
For Each bl In temp_binValue
binlist.Add(bl)
Next
Dim binData As Byte() = New Byte(binlist.Count - 1) {}
For bd As Integer = 0 To binlist.Count - 1
binData(bd) = binlist(bd)
Next
Return binData
End Function
您正在conv_ByteToBin方法中串聯很大的字符串。 在這種情況下,使用基本的字符串連接是非常不好的做法,這似乎是您的瓶頸。 我只是將該方法更改為使用StringBuilder,因為它是連接大型字符串的有效方法,並且代碼運行的速度快得多:
Public Function conv_ByteToBin(ByVal conv() As Byte) As String
Dim newBin As New StringBuilder
For Each c In conv
newBin.Append(Convert.ToString(c, 2).PadLeft(8, "0"))
Next
Console.WriteLine("Returning value")
Return newBin.ToString
End Function
最佳做法提示:
同樣,您的方法conv_FileToByte是不相關的,因為.net已經內置了File.ReadAllBytes-方法,該方法可以執行相同的操作。 只需調用它並刪除自己的實現即可。
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