用VB6.0编写自我升级的程序(一)
曾经有位网友和我讨论怎样编写一个通过服务器对客户机上的程序进行自我升级的问题,由于我的项目也涉及到自我升级,当时我把我的解决方案提了出来,那就是做一个类似于瑞星的升级程序。在这里我也发现了很多的网友对这个问题很困惑,故我愿意把我的设计方案写出来与大家共享,大家也可以通过这个思路用其他语言进行改写。
以下是我的具体思路:
写两个程序,一个是主程序;一个是升级程序(升级程序放在服务器上);
说明:所有升级任务都由升级程序完成。
1.启动升级程序,升级程序连接到网站,下载新的主程序(当然还包括支持的库文件等)到临时文件夹;
2.升级程序检测旧的主程序是否活动,若活动则关闭旧的主程序(同时记下主程序的状态);
3.删除旧的主程序,拷贝临时文件夹中的文件到相应的位置,同时注册相应的文件;
4.检查主程序的状态,若状态为活动的,则启动新的主程序;
5.关闭升级程序。
6.祝贺你,升级完成。
下面进行具体的程序编写,需建立三个工程,然后把它们编辑成一个组,三个工程需共用一个模块。
建立工程步骤:
1.建立工程proMain:
打开vb,“新建工程”,选择“标准EXE”,
再给工程中添加模块,并且命名为modCommon,修改窗体名为frmMain,同时修改工程名为projMain,然后保存到某个文件夹(譬如在桌面建立个文件夹Update),窗体、模块和工程分别保存为frmMain.frm、modCommon.bas、projMain.vbp;
2.建立工程projNewMain:
点击菜单“文件|新建工程”
,选择“标准EXE”,点击菜单“工程|添加模块”,在弹出的对话框中选择“现存”标签,定位到Update文件夹,选中modCommon.bas模块。修改窗体名为frmNewMain,同时修改工程名为projNewMain,然后保存到Update文件夹,窗体和工程分别保存为frmNewMain.frm、projNewMain.vbp;
3.建立工程projUpdate:
点击菜单“文件|新建工程”
,选择“标准EXE”,点击菜单“工程|添加模块”,在弹出的对话框中选择“现存”标签,定位到Update文件夹,选中modCommon.bas模块。修改窗体名为frmUpdate,同时修改工程名为projUpdate,然后保存到Update文件夹,窗体和工程分别保存为frmUpdate.frm、projUpdate.vbp;
4.建立组:
在工程projUpdate中,点击菜单“文件|添加工程…”在弹出的对话框中选择“现存”标签,定位到Update文件夹,选择projMain.vbp;重复该动作,选择projNewMain.vbp;保存该组即可;
5.关闭工程,定位到Update文件夹,然后执行下面的步骤。
各个工程文件中的文件源码:
一、 projMain.vbp工程:
说明:这个是旧的主程序,从来没有进行过升级前的程序。
用记事本打开frmMain.frm文件,copy以下内容到其中:
VERSION 5.00
Begin VB.Form frmMain
Caption = "请点击升级进行程序"
ClientHeight = 1140
ClientLeft = 60
ClientTop = 345
ClientWidth = 4500
LinkTopic = "Form1"
ScaleHeight = 1140
ScaleWidth = 4500
StartUpPosition = 3 '窗口缺省
Begin VB.CommandButton Command1
Caption = "升级"
Height = 525
Left = 1380
TabIndex = 0
Top = 570
Width = 1245
End
End
Attribute VB_Name = "frmMain"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
' ------------------------------------------
' 升级程序的例子
' 作者: 谢家峰
' 日期: 2003/12/19
'
' 这里是没有升级时的主程序
'
' ------------------------------------------
Private Sub Command1_Click()
Command1.Enabled = False
' 运行更新程序
Shell App.Path & "\update.exe", vbNormalFocus
End Sub
Private Sub Form_Load()
If App.PrevInstance Then End
UpdateIniPath = App.Path & "\Update.ini"
' 记录主程序的名字
WritePrivateProfileString "Main", "Name", App.EXEName, UpdateIniPath
' 记录运行状态
WritePrivateProfileString "Main", "Active", "-1", UpdateIniPath
'记录更新次数
WritePrivateProfileString "Update", "Num", "0", UpdateIniPath
Me.Caption = App.EXEName
End Sub
Private Sub Form_Unload(Cancel As Integer)
' 记录运行状态
WritePrivateProfileString "Main", "Active", "0", UpdateIniPath
End Sub
用记事本打开modCommon.bas文件,copy以下内容到其中:
Attribute VB_Name = "modCommon"
Option Explicit
' ------------------------------------------
' 升级程序的例子
' 作者: 谢家峰
' 日期: 2003/12/19
' 这里是通用模块,放置API函数以及公用函数
' ------------------------------------------
Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As
Long)
Public Declare Function GetPrivateProfileString Lib "kernel32" Alias
"GetPrivateProfileStringA" (ByVal lpApplicationName As String, ByVal
lpKeyName As Any, ByVal lpDefault As String, ByVal lpReturnedString
As String, ByVal lSize As Long, ByVal lpFilename As String) As Long
Public Declare Function WritePrivateProfileString Lib "kernel32"
Alias "WritePrivateProfileStringA" (ByVal lpApplicationName As Any,
ByVal lpKeyName As Any, ByVal lpString As Any, ByVal lplFilename As
String) As Long
Public Declare Function GetPrivateProfileSection Lib "kernel32"
Alias "GetPrivateProfileSectionA" (ByVal lpAppName As String, ByVal
lpReturnedString As String, ByVal nSize As Long, ByVal lpFilename As
String) As Long
Public Declare Function FindWindow Lib "user32" Alias "FindWindowA"
(ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Public Declare Function SendMessage Lib "user32" Alias
"SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam
As Long, lParam As Any) As Long
Const WM_Close = &H10
Private Const gintMAX_SIZE% = 255 'Maximum buffer size
Public UpdateIniPath As String
' ===============================================
' 从资源文件中提取文件
' ===============================================
Public Function SaveFileFromRes(vntResourceID As Variant, sType As
String, sFileName As String) As Boolean
Dim bytImage() As Byte
Dim iFileNum As Integer
On Error GoTo SaveFileFromRes_Err
SaveFileFromRes = True
bytImage = LoadResData(vntResourceID, sType)
iFileNum = FreeFile
Open sFileName For Binary As iFileNum
Put #iFileNum, , bytImage
Close iFileNum
Exit Function
SaveFileFromRes_Err:
SaveFileFromRes = False: Exit Function
End Function
' ===============================================
' 从缓冲区中读取字符串
' ===============================================
Private Function StringFromBuffer(Buffer As String) As String
Dim nPos As Long
nPos = InStr(Buffer, vbNullChar)
If nPos > 0 Then
StringFromBuffer = Left$(Buffer, nPos - 1)
Else
StringFromBuffer = Buffer
End If
End Function
' ===============================================
' 读Ini文件
' ===============================================
Public Function ReadIniFile(ByVal strIniFile As String, ByVal
strSection As String, ByVal strKey As String, Optional ByVal
strKeyDefault As String = vbNullString) As String
Dim strBuffer As String
strBuffer = Space$(gintMAX_SIZE)
If GetPrivateProfileString(strSection, strKey, strKeyDefault,_
strBuffer, gintMAX_SIZE, strIniFile) Then
ReadIniFile = StringFromBuffer(strBuffer)
End If
End Function
' 检查文件是否存在
Function FileExists(filename As String) As Boolean
On Error Resume Next
FileExists = (Dir$(filename) <> "")
End Function
' 改变标签的文本及位置
Public Function ChangeLabelPos(frm As Form, lbl As Label, msg As
String)
With lbl
.Caption = msg
.Left = (frm.ScaleWidth - .Width) / 2
.Top = .Height / 2
End With
End Function
'关闭窗体
Function CloseValidForm(Ret As String) As Boolean
Dim WinWnd As Long
'搜寻该窗口的句柄
WinWnd = FindWindow(vbNullString, Ret)
If WinWnd <> 0 Then
SendMessage WinWnd, WM_Close, 0&, 0&
End If
CloseValidForm = True
End Function
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