GFCompression/ZLib/ZLib_Testfrm.frm
VERSION 5.00
Begin VB.Form Form1
Caption = "Form1"
ClientHeight = 3195
ClientLeft = 60
ClientTop = 345
ClientWidth = 4635
LinkTopic = "Form1"
ScaleHeight = 3195
ScaleWidth = 4635
StartUpPosition = 3 'Windows‑Standard
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
'(c)2001 by Louis, ZLib.dll (c) by Jean‑loup Gailly & Mark Adler. Test project for ZLib.dll.
'
'NOTE: remove directory 'F:\GF\GFCompression\ZLib\' when copying declarations to target project.
'
Private Declare Function compress Lib "F:\GF\GFCompression\ZLib\zlib.dll" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long
Private Declare Function compress2 Lib "F:\GF\GFCompression\ZLib\zlib.dll" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long, ByVal level As Long) As Long
Private Declare Function uncompress Lib "F:\GF\GFCompression\ZLib\zlib.dll" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long
Private Sub Form_Load()
'on error resume next
Dim SourceByteStringLength As Long
Dim SourceByteString() As Byte
Dim TargetByteStringLength As Long
Dim TargetByteString() As Byte
'begin
Open "C:\Command.com" For Binary As #1
SourceByteStringLength = LOF(1)
ReDim SourceByteString(1 To SourceByteStringLength) As Byte
Get #1, 1, SourceByteString()
Close #1
TargetByteStringLength = CLng(CSng(SourceByteStringLength) * 1.05!) 'add five percent for safety
ReDim TargetByteString(1 To TargetByteStringLength) As Byte
'compress
Debug.Print compress(TargetByteString(1), TargetByteStringLength, SourceByteString(1), SourceByteStringLength)
Debug.Print TargetByteStringLength
'decompress
Call uncompress(SourceByteString(1), SourceByteStringLength, TargetByteString(1), TargetByteStringLength)
Debug.Print SourceByteStringLength
End Sub
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