frmabout.frm

MDI多文档界面的程序实例

VERSION 5.00
Begin VB.Form frmAbout 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "About MDIDemo"
   ClientHeight    =   3630
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   5655
   ClipControls    =   0   'False
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3630
   ScaleWidth      =   5655
   ShowInTaskbar   =   0   'False
   StartUpPosition =   1  'CenterOwner
   Tag             =   "About MDIDemo"
   Begin VB.PictureBox picIcon 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      ClipControls    =   0   'False
      Height          =   540
      Left            =   240
      Picture         =   "frmAbout.frx":0000
      ScaleHeight     =   480
      ScaleMode       =   0  'User
      ScaleWidth      =   480
      TabIndex        =   2
      TabStop         =   0   'False
      Top             =   240
      Width           =   540
   End
   Begin VB.CommandButton cmdOK 
      Cancel          =   -1  'True
      Caption         =   "OK"
      Default         =   -1  'True
      Height          =   345
      Left            =   4245
      TabIndex        =   0
      Tag             =   "OK"
      Top             =   2625
      Width           =   1260
   End
   Begin VB.CommandButton cmdSysInfo 
      Caption         =   "&System Info..."
      Height          =   345
      Left            =   4260
      TabIndex        =   1
      Tag             =   "&System Info..."
      Top             =   3075
      Width           =   1245
   End
   Begin VB.Label lblDescription 
      Caption         =   "A demonstration that you can build better MDI apps using forms' properties and methods"
      ForeColor       =   &H00000000&
      Height          =   1170
      Left            =   1050
      TabIndex        =   6
      Tag             =   "App Description"
      Top             =   1125
      Width           =   3885
   End
   Begin VB.Label lblTitle 
      Caption         =   "Application Title"
      ForeColor       =   &H00000000&
      Height          =   480
      Left            =   1050
      TabIndex        =   5
      Tag             =   "Application Title"
      Top             =   240
      Width           =   3885
   End
   Begin VB.Line Line1 
      BorderColor     =   &H00808080&
      BorderStyle     =   6  'Inside Solid
      Index           =   1
      X1              =   225
      X2              =   5450
      Y1              =   2430
      Y2              =   2430
   End
   Begin VB.Line Line1 
      BorderColor     =   &H00FFFFFF&
      BorderWidth     =   2
      Index           =   0
      X1              =   240
      X2              =   5450
      Y1              =   2445
      Y2              =   2445
   End
   Begin VB.Label lblVersion 
      Caption         =   "Version"
      Height          =   225
      Left            =   1050
      TabIndex        =   4
      Tag             =   "Version"
      Top             =   780
      Width           =   3885
   End
   Begin VB.Label lblDisclaimer 
      Caption         =   "Warning:   feel free to reuse this code in your own application, as well as change it to meet your needs"
      ForeColor       =   &H00000000&
      Height          =   825
      Left            =   255
      TabIndex        =   3
      Tag             =   "Warning: ..."
      Top             =   2625
      Width           =   3870
   End
End
Attribute VB_Name = "frmAbout"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

' Reg Key Security Options...
Const KEY_ALL_ACCESS = &H2003F
                                          

' Reg Key ROOT Types...
Const HKEY_LOCAL_MACHINE = &H80000002
Const ERROR_SUCCESS = 0
Const REG_SZ = 1                         ' Unicode nul terminated string
Const REG_DWORD = 4                      ' 32-bit number


Const gREGKEYSYSINFOLOC = "SOFTWARE\Microsoft\Shared Tools Location"
Const gREGVALSYSINFOLOC = "MSINFO"
Const gREGKEYSYSINFO = "SOFTWARE\Microsoft\Shared Tools\MSINFO"
Const gREGVALSYSINFO = "PATH"


Private Declare Function RegOpenKeyEx Lib "advapi32" Alias "RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, ByVal samDesired As Long, ByRef phkResult As Long) As Long
Private Declare Function RegQueryValueEx Lib "advapi32" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, ByRef lpType As Long, ByVal lpData As String, ByRef lpcbData As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32" (ByVal hKey As Long) As Long

Private Sub Form_Load()
    lblVersion.Caption = "Version " & App.Major & "." & App.Minor & "." & App.Revision
    lblTitle.Caption = App.Title
End Sub

Private Sub cmdSysInfo_Click()
        Call StartSysInfo
End Sub

Private Sub cmdOK_Click()
        Unload Me
End Sub

Public Sub StartSysInfo()
    On Error GoTo SysInfoErr

    Dim rc As Long
    Dim SysInfoPath As String
        

    ' Try To Get System Info Program Path\Name From Registry...
    If GetKeyValue(HKEY_LOCAL_MACHINE, gREGKEYSYSINFO, gREGVALSYSINFO, SysInfoPath) Then
    ' Try To Get System Info Program Path Only From Registry...
    ElseIf GetKeyValue(HKEY_LOCAL_MACHINE, gREGKEYSYSINFOLOC, gREGVALSYSINFOLOC, SysInfoPath) Then
            ' Validate Existance Of Known 32 Bit File Version
            If (Dir(SysInfoPath & "\MSINFO32.EXE") <> "") Then
                    SysInfoPath = SysInfoPath & "\MSINFO32.EXE"
                    

            ' Error - File Can Not Be Found...
            Else
                    GoTo SysInfoErr
            End If
    ' Error - Registry Entry Can Not Be Found...
    Else
            GoTo SysInfoErr
    End If
    

    Call Shell(SysInfoPath, vbNormalFocus)
    

    Exit Sub
SysInfoErr:
    MsgBox "System Information Is Unavailable At This Time", vbOKOnly
End Sub

Public Function GetKeyValue(KeyRoot As Long, KeyName As String, SubKeyRef As String, ByRef KeyVal As String) As Boolean
    Dim i As Long                                           ' Loop Counter
    Dim rc As Long                                          ' Return Code
    Dim hKey As Long                                        ' Handle To An Open Registry Key
    Dim hDepth As Long                                      '
    Dim KeyValType As Long                                  ' Data Type Of A Registry Key
    Dim tmpVal As String                                    ' Tempory Storage For A Registry Key Value
    Dim KeyValSize As Long                                  ' Size Of Registry Key Variable
    '------------------------------------------------------------
    ' Open RegKey Under KeyRoot {HKEY_LOCAL_MACHINE...}
    '------------------------------------------------------------
    rc = RegOpenKeyEx(KeyRoot, KeyName, 0, KEY_ALL_ACCESS, hKey) ' Open Registry Key
    

    If (rc <> ERROR_SUCCESS) Then GoTo GetKeyError          ' Handle Error...
    

    tmpVal = String$(1024, 0)                             ' Allocate Variable Space
    KeyValSize = 1024                                       ' Mark Variable Size
    

    '------------------------------------------------------------
    ' Retrieve Registry Key Value...
    '------------------------------------------------------------
    rc = RegQueryValueEx(hKey, SubKeyRef, 0, KeyValType, tmpVal, KeyValSize)    ' Get/Create Key Value
                                            

    If (rc <> ERROR_SUCCESS) Then GoTo GetKeyError          ' Handle Errors
    

    If (Asc(Mid(tmpVal, KeyValSize, 1)) = 0) Then           ' Win95 Adds Null Terminated String...
            tmpVal = Left(tmpVal, KeyValSize - 1)               ' Null Found, Extract From String
    Else                                                    ' WinNT Does NOT Null Terminate String...
            tmpVal = Left(tmpVal, KeyValSize)                   ' Null Not Found, Extract String Only
    End If
    '------------------------------------------------------------
    ' Determine Key Value Type For Conversion...
    '------------------------------------------------------------
    Select Case KeyValType                                  ' Search Data Types...
    Case REG_SZ                                             ' String Registry Key Data Type
            KeyVal = tmpVal                                     ' Copy String Value
    Case REG_DWORD                                          ' Double Word Registry Key Data Type
            For i = Len(tmpVal) To 1 Step -1                    ' Convert Each Bit
                    KeyVal = KeyVal + Hex(Asc(Mid(tmpVal, i, 1)))   ' Build Value Char. By Char.
            Next
            KeyVal = Format$("&h" + KeyVal)                     ' Convert Double Word To String
    End Select
    

    GetKeyValue = True                                      ' Return Success
    rc = RegCloseKey(hKey)                                  ' Close Registry Key
    Exit Function                                           ' Exit
    

GetKeyError:    ' Cleanup After An Error Has Occured...
    KeyVal = ""                                             ' Set Return Val To Empty String
    GetKeyValue = False                                     ' Return Failure
    rc = RegCloseKey(hKey)                                  ' Close Registry Key
End Function