by Jon Barker (11 Submissions)
Category: Files/File Controls/Input/Output
Compatability: Visual Basic 5.0
Difficulty: Intermediate
Date Added: Wed 3rd February 2021
Rating: 
(6 Votes)
This code can be made to take a certain chunk of your choice from a file. Mainly for making resumable downloads etc, or working on a patch for a program... I made this cos im working on a file sharing program that downloads from multiple sources. SERVERAL UPDATES HAVE TAKEN PLACE (thanks to guys who posted comments improving the code)
VBcodersOption Explicit
Sub GetFilePart(FilenameFROM As String, FilenameTO As String, StartPos As Long, EndPos As Long)
Dim bData() As Byte
Dim sBuf As String
Dim i As Long
Dim l As Long
Dim File1 as Integer
Dim File2 as Integer
File2 = Freefile
Open FilenameTO For Binary As #File2
File1 = Freefile
Open FilenameFROM For Binary As #File1
Get #File1, StartPos, bData
ReDim bData(1 To 2048) As Byte
For l = 1 To (EndPos - StartPos) \ 2048
Get #File1, 2048 * (l - 1) + StartPos, bData
Put #File2, , bData
Next
i = (EndPos - StartPos) Mod 2048
If i <> 0 Then
ReDim bData(1 To i) As Byte
Get #File1, , bData
Put #File2, , bData
End If
Close #File1
Close #File2
End Sub
Private Sub cmdStart_Click()
Call GetFilePart("c:\filename.exe", "C:\filename2.exe", 100, 3000)
'this example above would get bytes 100 to 3000 in the program 'c:\filename.exe', and put them into
'the file 'C:\filename2.exe'. The size of 'C:\filename2.exe' is now 2900 byes.
End Sub
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