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一个取图片尺寸的类,支持jpg,gif,png

王朝other·作者佚名  2006-12-16
窄屏简体版  字體: |||超大  

一个取图片尺寸的类,支持jpg,gif,png

'I have released this source code into the public domain. You may use it

'with no strings attached.

'Just call GetImageSize with a string containing the filename, and

'it will return a user defined type 'ImageSize' (see below)

'Return values of 0 indicate an error of some sort. The error handling

'in this module is limited. There is *NO* error handling on the test

'form. This routine is limited to X or Y sizes of 32767 pixels, but that

'should not be a problem.

'Check back athttp://www.qtm.net/~davidc

'I may add support for more file types.

'supported in this version:

'JPEG

'GIF

'PNG

'This routine does not require any royalty fees for Unisys as it

'does nothing with the compressed part of GIF files. It simply reads

'4 bytes to determine image size.

Option Explicit

Public WImg As Long

Public HImg As Long

Public Type ImageSize

Width As Long

Height As Long

End Type

Public Sub GetImageSize(sFileName As String)

On Error Resume Next 'you'll want to change this

Dim iFN As Integer

Dim bTemp(3) As Byte

Dim lFlen As Long

Dim lPos As Long

Dim bHmsb As Byte

Dim bHlsb As Byte

Dim bWmsb As Byte

Dim bWlsb As Byte

Dim bBuf(7) As Byte

Dim bDone As Byte

Dim iCount As Integer

lFlen = FileLen(sFileName)

iFN = FreeFile

Open sFileName For Binary As iFN

Get #iFN, 1, bTemp()

'PNG file

If bTemp(0) = &H89 And bTemp(1) = &H50 And bTemp(2) = &H4E _

And bTemp(3) = &H47 Then

Get #iFN, 19, bWmsb

Get #iFN, 20, bWlsb

Get #iFN, 23, bHmsb

Get #iFN, 24, bHlsb

'GetImageSize.Width = CombineBytes(bWlsb, bWmsb)

'GetImageSize.Height = CombineBytes(bHlsb, bHmsb)

WImg = CombineBytes(bWlsb, bWmsb)

HImg = CombineBytes(bHlsb, bHmsb)

End If

'GIF file

If bTemp(0) = &H47 And bTemp(1) = &H49 And bTemp(2) = &H46 _

And bTemp(3) = &H38 Then

Get #iFN, 7, bWlsb

Get #iFN, 8, bWmsb

Get #iFN, 9, bHlsb

Get #iFN, 10, bHmsb

'GetImageSize.Width = CombineBytes(bWlsb, bWmsb)

'GetImageSize.Height = CombineBytes(bHlsb, bHmsb)

WImg = CombineBytes(bWlsb, bWmsb)

HImg = CombineBytes(bHlsb, bHmsb)

End If

'JPEG file

If bTemp(0) = &HFF And bTemp(1) = &HD8 And bTemp(2) = &HFF Then

Debug.Print "JPEG"

lPos = 3

Do

Do

Get #iFN, lPos, bBuf(1)

Get #iFN, lPos + 1, bBuf(2)

lPos = lPos + 1

Loop Until (bBuf(1) = &HFF And bBuf(2) <> &HFF) Or lPos > lFlen

For iCount = 0 To 7

Get #iFN, lPos + iCount, bBuf(iCount)

Next iCount

If bBuf(0) >= &HC0 And bBuf(0) <= &HC3 Then

bHmsb = bBuf(4)

bHlsb = bBuf(5)

bWmsb = bBuf(6)

bWlsb = bBuf(7)

bDone = 1

Else

lPos = lPos + (CombineBytes(bBuf(2), bBuf(1))) + 1

End If

Loop While lPos < lFlen And bDone = 0

'GetImageSize.Width = CombineBytes(bWlsb, bWmsb)

'GetImageSize.Height = CombineBytes(bHlsb, bHmsb)

WImg = CombineBytes(bWlsb, bWmsb)

HImg = CombineBytes(bHlsb, bHmsb)

End If

Close iFN

End Sub

Private Function CombineBytes(lsb As Byte, msb As Byte) As Long

CombineBytes = CLng(lsb + (msb * 256))

End Function

 
 
 
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