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How do you like the new design?
It's cool, great job
[tally: 70%] 70%
It's okay
[tally: 20%] 20%
Its OK but I liked the old layout better
[tally: 0%] 0%
Please bring the old one back
[tally: 10%] 10%

votes: 10

ID: 349
Viewed: 2791
Added: Aug 19, 2002
Version:
Snippet uploaded by: snippet
Written By: Unknown
Demo: Sorry, no demo



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reads the header of a jpeg and gets it's information

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<!---Declaration--->
none

Highlight All
<!---Code--->
Public Type BITMAPINFO
Width As Long
Height As Long
End Type

Public Function GetJPGInfo(ByVal FileName As String) As BITMAPINFO
Dim bChar As Byte
Dim a As Byte, b As Byte
Dim c As Byte, D As Byte
Dim E As Byte, f As Byte
Dim i As Integer
Dim DotPos As Integer
Dim Header As String
Dim blExit As Boolean
Dim MarkerLen As Long
Dim ImgWidth As Integer
Dim ImgHeight As Integer
Dim ImgSize As String
Dim fnum As Integer
Dim ImageInfo As BITMAPINFO
On Error Resume Next

fnum = FreeFile
Open FileName For Binary As #fnum

ImgSize = LOF(fnum) / 1024
DotPos = InStr(ImgSize, ",")
ImgSize = Left(ImgSize, DotPos)

Get #fnum, , bChar
Header = Hex$(bChar)
Get #fnum, , bChar
Header = Header & Hex$(bChar)
If Header <> "FFD8" Then Exit Function

While Not blExit
Do Until Hex$(bChar) = "FF"
Get #fnum, , bChar
Loop

Get #fnum, , bChar
If Hex$(bChar) >= "C0" And _
Hex$(bChar) <= "C3" Then
Get #fnum, , bChar
Get #fnum, , bChar
Get #fnum, , bChar

Get #fnum, , bChar
a = bChar
Get #fnum, , bChar
b = bChar
Get #fnum, , bChar
c = bChar
Get #fnum, , bChar
D = bChar

ImgHeight = CInt(a * 256 + b)
ImgWidth = CInt(c * 256 + D)
blExit = True
Else
If Hex$(bChar) = "DA" Then
blExit = True
Else
Get #fnum, , bChar
E = bChar
Get #fnum, , bChar
f = bChar
MarkerLen = (E * 256 + f) - 2

Dim marker As String
marker = String(MarkerLen, vbNullChar)
Get #fnum, , marker
End If
End If
Wend

Close #fnum

With ImageInfo
.Width = ImgWidth
.Height = ImgHeight
End With

GetJPGInfo = ImageInfo
End Function;


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