VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "CRC32自校檢演示"
   ClientHeight    =   4500
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5010
   LinkTopic       =   "Form1"
   ScaleHeight     =   4500
   ScaleWidth      =   5010
   StartUpPosition =   2  '屏幕中心
   Begin VB.TextBox Text4 
      Height          =   270
      Left            =   1440
      TabIndex        =   13
      Top             =   2160
      Width           =   1095
   End
   Begin VB.CommandButton Command3 
      Caption         =   "讀取"
      Height          =   345
      Left            =   4440
      TabIndex        =   11
      Top             =   120
      Width           =   495
   End
   Begin VB.CommandButton Command1 
      Caption         =   "添加標識"
      Enabled         =   0   'False
      Height          =   375
      Left            =   1560
      TabIndex        =   10
      Top             =   2520
      Width           =   975
   End
   Begin VB.TextBox Text3 
      Height          =   270
      Left            =   1440
      TabIndex        =   9
      Top             =   1800
      Width           =   1095
   End
   Begin VB.TextBox Text2 
      Height          =   270
      Left            =   1440
      TabIndex        =   8
      Top             =   1440
      Width           =   1095
   End
   Begin VB.TextBox Text1 
      Height          =   270
      Left            =   1440
      OLEDropMode     =   1  'Manual
      TabIndex        =   5
      Top             =   1080
      Width           =   1095
   End
   Begin VB.Label Label7 
      Caption         =   "特征碼標識："
      Height          =   255
      Left            =   120
      TabIndex        =   12
      Top             =   2160
      Width           =   1095
   End
   Begin VB.Label Label6 
      Caption         =   "CRC32："
      Height          =   255
      Left            =   120
      TabIndex        =   7
      Top             =   1800
      Width           =   855
   End
   Begin VB.Label Label5 
      Caption         =   "長度："
      Height          =   255
      Left            =   120
      TabIndex        =   6
      Top             =   1440
      Width           =   975
   End
   Begin VB.Label Label4 
      Caption         =   "待處理文件："
      Height          =   255
      Left            =   120
      TabIndex        =   4
      Top             =   1080
      Width           =   1095
   End
   Begin VB.Label Label3 
      Caption         =   "0"
      Height          =   255
      Left            =   3240
      TabIndex        =   3
      Top             =   240
      Width           =   1215
   End
   Begin VB.Label Label2 
      Caption         =   "0"
      Height          =   255
      Left            =   3240
      TabIndex        =   2
      Top             =   600
      Width           =   1575
   End
   Begin VB.Label Label1 
      Caption         =   "讀取后0位字節存儲的CRC為："
      Height          =   255
      Index           =   2
      Left            =   120
      TabIndex        =   1
      Top             =   240
      Width           =   3015
   End
   Begin VB.Label Label1 
      Caption         =   "除去后0位字節后的CRC為："
      Height          =   255
      Index           =   0
      Left            =   120
      TabIndex        =   0
      Top             =   600
      Width           =   3015
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Declare Function GetModuleFileName Lib "kernel32" Alias "GetModuleFileNameA" (ByVal hModule As Long, ByVal lpFileName As String, ByVal nSize As Long) As Long
      'Better than App.EXEName because it also    gets the extension
      '(It's possible to run a program with any extension, not just .exe)


Private Function FullAppName() As String
      Dim modName As String * 256
      Dim i As Long
      Dim j As Long
      i = GetModuleFileName(App.hInstance, modName, Len(modName))
      FullAppName = Left$(modName, i)
      j = Len(FullAppName)
      Do While Mid(FullAppName, j, 1) = vbNullChar
        j = j - 1
      Loop
      FullAppName = Trim(Left(FullAppName, j))
End Function

Private Sub Command1_Click()
    Dim sCRC32 As String
    Dim FileNum As Integer
    Dim bArry() As Byte
    sCRC32 = "C:" & Text3.Text
    bArry() = StrConv(sCRC32, vbFromUnicode)
    FileNum = FreeFile
    Open Text1.Text For Binary As #FileNum
        Seek #FileNum, LOF(FileNum) + 1
        Put #FileNum, , bArry
    Close #FileNum
End Sub

Private Sub Command3_Click()
    Dim cCRC32 As New cCRC32
    Dim lCRC32 As Long
    Dim cStream As New cBinaryFileStream
    cStream.File = FullAppName
    cStream.FileStart = 1
    cStream.FileEnd = cStream.Length - 10
    lCRC32 = cCRC32.GetFileCrc32(cStream)
    Label2 = Hex(lCRC32)
    Set cCRC32 = Nothing
    Set cStream = Nothing
End Sub

Private Sub Text1_OLEDragOver(Data As DataObject, Effect As Long, Button As Integer, Shift As Integer, X As Single, Y As Single, State As Integer)
    Text1 = Data.Files(1)
    
    Dim i As Integer
    Dim sCRC32 As String
    Dim cCRC32 As New cCRC32
    Dim lCRC32 As Long
    Dim cStream As New cBinaryFileStream
    cStream.File = Text1.Text
    Text2 = cStream.Length
    cStream.FileStart = 1
    cStream.FileEnd = cStream.Length
    lCRC32 = cCRC32.GetFileCrc32(cStream)
    Text3 = Hex(lCRC32)
    Text2 = cStream.Length
    Set cCRC32 = Nothing
    Set cStream = Nothing
    
    
    Dim FileNum As Integer
    Dim bArry(0 To 9) As Byte
    FileNum = FreeFile
    Open Text1.Text For Binary As #FileNum
        Seek #FileNum, LOF(FileNum) - 9
        Get #FileNum, , bArry
    Close #FileNum
    
    If Chr(bArry(0)) = "C" Then
        For i = 2 To 9
            sCRC32 = sCRC32 & Chr(bArry(i))
        Next
        Text4 = sCRC32
        Command1.Enabled = False
    Else
        Text4 = "Found Nothing"
        Command1.Enabled = True
    
    End If
    
    
    
End Sub