vb.net输出日志 vb运行怎么输出日志

请教高手，如何用vb实现“使用日志”？

很多种方法，最常用的一是用文本文件或数据库记录，二是调用API函数直接写入系统日志或应用程序日志

相关问答

Q1: 在vb.net 中,记录系统错误日志这个功能怎么实现

Public Sub ShowError(strModule As String, strProcedure As String, lngErrorNumber As Long, strErrorDescription As String, showMsg As String)

'

'错误处理中心过程,写数据库日志表或写日志文件

'

'strModule '模块名称

'strProcedure '过程名称

'lngErrorNumber '错误ID号

'strErrorDescription '错误描述

'showMsg '是否显示本过程内错误显示信息(值:"Y" or "N")

'Error表结构(f001 (Date)发生时间, f002 (nvarchar50)模块名称, f003 (nvarchar50)过程名称, f004 (nvarchar50)错误ID号, _

f005 (nvarchar300)错误描述,f006 (nvarchar50)版 本 号, f007 (nvarchar50)用户名称, f008 (nvarchar50)网卡地址

'ErrorCode表结构 f001 (nvarchar20)错误代码, f002 (nvarchar255)错误信息, f003 (numeric9)错误级别

' 级别说明: '10'以下,一般错误,不影响操作

' '11-20',严重错误,不能操作,程序执行退出

On Error GoTo ErrorHandle

Dim strMessage As String

Dim strCaption As String

Dim sVer As String

Dim intLogFile As Integer

Dim Res As New ADODB.Recordset

Dim ResErrorCode As New ADODB.Recordset

Dim strSQL As String

'对应错误号,从ErrorCode表中找到对应的错误信息,0-1000 错误号保留给VB

DBOpen ResErrorCode, "select * from errorcode where f001='" lngErrorNumber "'"

If Not (ResErrorCode.EOF Or ResErrorCode.BOF) Then

strMessage = ResErrorCode.Fields("f002")

If ResErrorCode.Fields("f003") 10 Then

MsgBox "产生一个严重错误,可能影响到系统的可操作性,请立即联系本系统开发人员!", vbCritical, "严重错误"

End If

End If

'写错误入文件----------------------------

intLogFile = FreeFile

Open App.Path "\" strIni.LogFile For Append As #intLogFile

Print #intLogFile, "***错误"; VBA.Now "*** " "Version:" _

str$(App.Major) "." str$(App.Minor) "." Format(App.Revision, "0000")

Print #intLogFile, "Error: " lngErrorNumber

Print #intLogFile, "Description: " strErrorDescription

Print #intLogFile, "Module: " strModule

Print #intLogFile, "Procedure: " strProcedure

Print #intLogFile, ""

Close #intLogFile

If Len(strMessage) 2 Then strErrorDescription = strMessage

strMessage = "错误: " "(" lngErrorNumber ")" strErrorDescription vbCrLf vbCrLf _

"模块:" strModule "; 过程:" strProcedure

sVer = Trim(str$(App.Major) "." str$(App.Minor) "." _

Format(App.Revision, "0000"))

strCaption = "错误 Version: " sVer

'写错误入数据库表--------------------------

strSQL = "insert into error(f001,f002,f003,f004,f005,f006,f007,f008) values(" _

DateFmtB VBA.Now DateFmtE "," _

IIf(Len(Trim(strModule)) = 0, "null", "'" strModule "'") "," _

IIf(Len(Trim(strProcedure)) = 0, "null", "'" strProcedure "'") "," _

IIf(Len(Trim(lngErrorNumber)) = 0, "null", "'" lngErrorNumber "'") "," _

IIf(Len(Trim(strErrorDescription)) = 0, "null", "'" Replace(strErrorDescription, "'", "") "'") "," _

IIf(Len(Trim(sVer)) = 0, "null", "'" sVer "'") "," _

IIf(Len(Trim(sUserName)) = 0, "null", "'" sUserName "'") "," _

IIf(Len(Trim(sVer)) = 0, "null", "'" EthernetNO "'") ")"

Cn.Execute strSQL

'是否显示未知错误信息

If Trim(UCase(showMsg)) = "Y" Then MsgBox strMessage, vbCritical, strCaption

PROC_EXIT:

Set Res = Nothing

Set ResErrorCode = Nothing

Exit Sub

ErrorHandle:

Resume Next

Q2: 请问谁知道怎么用vb.net 打印.log日志文件， 用代码写的，谢谢了，急用

Dim sw As StreamWriter = New StreamWriter（“c:\xxxxx.log”， True） 'true是指以追加的方式打开指定文件

For i = 0 To j

temp = i.ToString

sw.WriteLine（temp）

sw.Flush（）

Next

sw.Close（）

sw = Nothing