VB.Net 文件处理类

1、编写日志

2、本地文件的读取和写入

3、Base64与图片的互相转换

Imports System.IO
Imports System.Text

Public Class Cls_File

#Region "编写日志"

    '根目录
    Public Shared strCurrentPath As String

    'Cls_File.WriteLog("FrmTask.Button1_Click", rtf.Text)

    Public Sub WriteLog(ByVal strModuelName As String, ByVal strDescription As String)
        Try
            '得到根目录
            strCurrentPath = System.Windows.Forms.Application.StartupPath + "AwLog"

            Dim strDt As String = Date.Now.ToString("yyyy-MM-dd HH:mm:ss")

            '判断目录是否存在，存在
            If Directory.Exists(strCurrentPath) = True Then
                '得到文件目录
                Dim strFilePath As String = strCurrentPath + DateTime.Today.ToString("yyyy-MM-dd", System.Globalization.DateTimeFormatInfo.InvariantInfo) + ".log"

                Dim sw As New StreamWriter(strFilePath, True)
                sw.WriteLine(strDt + ":" + "  " + strModuelName)
                sw.WriteLine(strDescription)
                sw.Close()

            Else
                '根目录不存在
                Dim dirPathInfo As DirectoryInfo = Directory.CreateDirectory(strCurrentPath)
                dirPathInfo.Attributes = FileAttributes.Archive
                '设置属性为存档 创建文件
                Dim sw As New StreamWriter(strCurrentPath + DateTime.Today.ToString("yyyy-MM-dd") + ".log", True)
                sw.WriteLine(strDt + ":" + "  " + strModuelName)
                sw.WriteLine(strDescription)
                sw.Close()
            End If

        Catch ex As Exception
            MsgBox(ex.Message.ToString, MsgBoxStyle.Exclamation, "提示")
        End Try

    End Sub

#End Region

#Region "本地文件读写字符串"

    Function ReadFile(ByVal FileName As String)
        Dim MyReader = New StreamReader(FileName, Encoding.UTF8)
        Dim MyText = MyReader.ReadToEnd()
        MyReader.Close()
        Return MyText
    End Function

    Function WriteFile(ByVal FileName As String, ByVal strTmp As String)
        Dim file As New System.IO.StreamWriter(FileName)
        file.WriteLine(strTmp)
        file.Close()
        Return "ok"
    End Function

#End Region

#Region "Base64与图片的互转"

    ''' <summary>
    ''' 将Base64转为图片
    ''' </summary>
    ''' <param name="base64"></param>
    ''' <returns></returns>
    Public Shared Function Base64ToImage(ByVal base64 As String) As Image
        Dim bases As String = base64
        Dim bytes As Byte() = Convert.FromBase64String(bases)
        Dim memStream As New MemoryStream(bytes)
        Dim bit As New Bitmap(memStream)
        Dim img As Image = bit
        Return img
    End Function


    ''' <summary>
    ''' 将图片转为Base64
    ''' </summary>
    ''' <param name="image"></param>
    ''' <returns></returns>
    Public Shared Function ImageToBase64(ByVal Image As Image) As String
        Try
            Dim ms As New MemoryStream()
            Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg)

            Dim arr As Byte() = New Byte(ms.Length - 1) {}

            ms.Position = 0
            ms.Read(arr, 0, CType(ms.Length, Integer))
            ms.Close()

            Dim strbaser64 As [String] = Convert.ToBase64String(arr)
            Return strbaser64
        Catch ex As Exception
            ImageToBase64 = ""
        End Try
    End Function

#End Region