ZjiÜt∞nφ informacφ o JPG obrßzku
Do deklaraΦnφ Φßsti formulß°e zapiÜte:
Private Type BITMAPINFO
Width As Long
Height As Long
End Type
Private 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
Na formulß° p°idejte tlaΦφtko a na jeho udßlost Click:
Private Sub Command1_Click()
Dim ABC As BITMAPINFO
ABC = GetJPGInfo("d:\transit\ponte.jpg")
Debug.Print CStr(ABC.Height) + "x" + CStr(ABC.Width)
End Sub