'***************************************************
'* 模 块 名：mdLSPicSize
'* 功能描述：读取图片尺寸信息(不加载图片，支持PNG)
'* 作 者：
'* 作者博客：
'* 日 期：2012-01-21 21:39
'* 版 本：V1.0.0
'***************************************************
'整行注释的为在读取图片尺寸时不需要的文件头信息
'BMP文件头
Private Type BitmapFileHeader
bfType As Integer '标识 0,1 两个字节为 42 4D 低位在前，即 19778
bfReserved2 As Integer
bfOffBits As Long
bfReserved1 As Integer
bfSize As Long
End Type
Private Type BitmapInfoHeader
biSize As Long
biWidth As Long '宽度 18,19,20,21 四个字节，低位在前
biHeight As Long '高度 22,23,24,25 四个字节，低位在前
' biPlanes As Integer
' biBitCount As Integer
' biCompression As Long
' biSizeImage As Long
' biXPelsPerMeter As Long
' biYPelsPerMeter As Long
' biClrUsed As Long
' biClrImportant As Long
End Type
'JPEG（这个好麻烦）
Private Type LSJPEGHeader
jSOI As Integer '图像开始标识 0,1 两个字节为 FF D8 低位在前，即 -9985
jAPP0 As Integer 'APP0块标识 2,3 两个字节为 FF E0
jAPP0Length(1) As Byte 'APP0块标识后的长度，两个字节，高位在前
' jJFIFName As Long 'JFIF标识 49(J) 48(F) 44(I) 52(F)
' jJFIFVer1 As Byte 'JFIF版本
' jJFIFVer2 As Byte 'JFIF版本
' jJFIFVer3 As Byte 'JFIF版本
' jJFIFUnit As Byte
' jJFIFX As Integer
' jJFIFY As Integer
' jJFIFsX As Byte
' jJFIFsY As Byte
End Type
Private Type LSJPEGChunk
jcType As Integer '标识（按顺序）：APPn(0,1~15)为 FF E1~FF EF; DQT为 FF DB(-9217)
'SOFn(0~3)为 FF C0(-16129),FF C1(-15873),FF C2(-15617),FF C3(-15361)
'DHT为 FF C4(-15105); 图像数据开始为 FF DA
jcLength(1) As Byte '标识后的长度，两个字节，高位在前
'若标识为SOFn，则读取以下信息；否则按照长度跳过，读下一块
jBlock As Byte '数据采样块大小 08 or 0C or 10
jHeight(1) As Byte '高度两个字节，高位在前
jWidth(1) As Byte '宽度两个字节，高位在前
' jColorType As Byte '颜色类型 03，后跟9字节，然后是DHT
End Type
'PNG文件头
Private Type LSPNGHeader
pType As Long '标识 0,1,2,3 四个字节为 89 50(P) 4E(N) 47(G) 低位在前，即 1196314761
pType2 As Long '标识 4,5,6,7 四个字节为 0D 0A 1A 0A
pIHDRLength As Long 'IHDR块标识后的长度，疑似固定 00 0D，高位在前，即 13
pIHDRName As Long 'IHDR块标识 49(I) 48(H) 44(D) 52(R)
Pwidth(3) As Byte '宽度 16,17,18,19 四个字节，高位在前
Pheight(3) As Byte '高度 20,21,22,23 四个字节，高位在前
' pBitDepth As Byte
' pColorType As Byte
' pCompress As Byte
' pFilter As Byte
' pInterlace As Byte
End Type
'GIF文件头（这个好简单）
Private Type LSGIFHeader
gType1 As Long '标识 0,1,2,3 四个字节为 47(G) 49(I) 46(F) 38(8) 低位在前，即 944130375
gType2 As Integer '版本 4,5 两个字节为 7a单幅静止图像9a若干幅图像形成连续动画
gWidth As Integer '宽度 6,7 两个字节，低位在前
gHeight As Integer '高度 8,9 两个字节，低位在前
End Type
Public Function PictureSize(ByVal picPath As String, ByRef Width As Long, ByRef Height As Long) As String
Dim iFile As Integer
Dim jpg As LSJPEGHeader
Width = 0: Height = 0 '预输出：0 * 0
If picPath = "" Then PictureSize = "null": Exit Function '文件路径为空
If Dir(picPath) = "" Then PictureSize = "not exist": Exit Function '文件不存在
PictureSize = "error" '预定义：出错
iFile = FreeFile()
Open picPath For Binary Access Read As #iFile
Get #iFile, , jpg
If jpg.jSOI = -9985 Then
Dim jpg2 As LSJPEGChunk, pass As Long
pass = 5 + jpg.jAPP0Length(0) * 256 + jpg.jAPP0Length(1) '高位在前的计算方法
PictureSize = "JPEG error" 'JPEG分析出错
Do
Get #iFile, pass, jpg2
If jpg2.jcType = -16129 Or jpg2.jcType = -15873 Or jpg2.jcType = -15617 Or jpg2.jcType = -15361 Then
Width = jpg2.jWidth(0) * 256 + jpg2.jWidth(1)
Height = jpg2.jHeight(0) * 256 + jpg2.jHeight(1)
PictureSize = Width & "*" & Height
'PictureSize = "JPEG" 'JPEG分析成功
Stop
Exit Do
End If
pass = pass + jpg2.jcLength(0) * 256 + jpg2.jcLength(1) + 2
Loop While jpg2.jcType <> -15105 'And pass < LOF(iFile)
ElseIf jpg.jSOI = 19778 Then
Dim bmp As BitmapInfoHeader
Get #iFile, 15, bmp
Width = bmp.biWidth
Height = bmp.biHeight
PictureSize = Width & "*" & Height
' PictureSize = "BMP" 'BMP分析成功
Else
Dim png As LSPNGHeader
Get #iFile, 1, png
If png.pType = 1196314761 Then
Width = png.Pwidth(0) * 16777216 + png.Pwidth(1) * 65536 + png.Pwidth(2) * 256 + png.Pwidth(3)
Height = png.Pheight(0) * 16777216 + png.Pheight(1) * 65536 + png.Pheight(2) * 256 + png.Pheight(3)
PictureSize = Width & "*" & Height
'PictureSize = "PNG" 'PNG分析成功
ElseIf png.pType = 944130375 Then
Dim gif As LSGIFHeader
Get #iFile, 1, gif
Width = gif.gWidth
Height = gif.gHeight
PictureSize = Width & "*" & Height
'PictureSize = "GIF" 'GIF分析成功
Else
PictureSize = "unknow" '文件类型未知
End If
End If
Close #iFile
End Function
'*************************以下是测试代码
Sub test()
Dim w As Long, h As Long
Dim f As String '图片文件完成路径
Dim t As String
Dim Pwidth As Long, Pheight As Long
Dim Psize As String
f = "D:\红烤全虾.jpg" '图片文件完成路径
Psize = PictureSize(f, w, h) '运行宏，w，h就是对应图片的width height ,返回 width*height
If Len(Psize) > 0 Then
Pwidth = Val(Split(Psize, "*")(0)) '返回 图片 宽
Pheight = Val(Split(Psize, "*")(1)) '返回 图片 高
End If
End Sub
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