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<% \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\'::: BMP, GIF, JPG and PNG ::: \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\'::: ::: \\\'::: This function gets a specified number of bytes from any ::: \\\'::: file, starting at the offset (base 1) ::: \\\'::: ::: \\\'::: Passed: ::: \\\'::: flnm => Filespec of file to read ::: \\\'::: offset => Offset at which to start reading ::: \\\'::: bytes => How many bytes to read ::: \\\'::: ::: \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: function GetBytes(flnm, offset, bytes) Dim objFSO Dim objFTemp Dim objTextStream Dim lngSize on error resume next Set objFSO = CreateObject("Scripting.FileSystemObject") \\\' First, we get the filesize Set objFTemp = objFSO.GetFile(flnm) lngSize = objFTemp.Size set objFTemp = nothing fsoForReading = 1 Set objTextStream = objFSO.OpenTextFile(flnm, fsoForReading) if offset > 0 then strBuff = objTextStream.Read(offset - 1) end if if bytes = -1 then \\\' Get All! GetBytes = objTextStream.Read(lngSize) \\\'ReadAll else GetBytes = objTextStream.Read(bytes) end if objTextStream.Close set objTextStream = nothing set objFSO = nothing end function \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\'::: ::: \\\'::: Functions to convert two bytes to a numeric value (long) ::: \\\'::: (both little-endian and big-endian) ::: \\\'::: ::: \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: function lngConvert(strTemp) lngConvert = clng(asc(left(strTemp, 1)) + ((asc(right(strTemp, 1)) * 256))) end function function lngConvert2(strTemp) lngConvert2 = clng(asc(right(strTemp, 1)) + ((asc(left(strTemp, 1)) * 256))) end function \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\'::: ::: \\\'::: This function does most of the real work. It will attempt ::: \\\'::: to read any file, regardless of the extension, and will ::: \\\'::: identify if it is a graphical image. ::: \\\'::: ::: \\\'::: Passed: ::: \\\'::: flnm => Filespec of file to read ::: \\\'::: width => width of image ::: \\\'::: height => height of image ::: \\\'::: depth => color depth (in number of colors) ::: \\\'::: strImageType=> type of image (e.g. GIF, BMP, etc.) ::: \\\'::: ::: \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: function gfxSpex(flnm, width, height, depth, strImageType) dim strPNG dim strGIF dim strBMP dim strType strType = "" strImageType = "(unknown)" gfxSpex = False strPNG = chr(137) & chr(80) & chr(78) strGIF = "GIF" strBMP = chr(66) & chr(77) strType = GetBytes(flnm, 0, 3) if strType = strGIF then \\\' is GIF strImageType = "GIF" Width = lngConvert(GetBytes(flnm, 7, 2)) Height = lngConvert(GetBytes(flnm, 9, 2)) Depth = 2 ^ ((asc(GetBytes(flnm, 11, 1)) and 7) + 1) gfxSpex = True elseif left(strType, 2) = strBMP then \\\' is BMP strImageType = "BMP" Width = lngConvert(GetBytes(flnm, 19, 2)) Height = lngConvert(GetBytes(flnm, 23, 2)) Depth = 2 ^ (asc(GetBytes(flnm, 29, 1))) gfxSpex = True elseif strType = strPNG then \\\' Is PNG strImageType = "PNG" Width = lngConvert2(GetBytes(flnm, 19, 2)) Height = lngConvert2(GetBytes(flnm, 23, 2)) Depth = getBytes(flnm, 25, 2) select case asc(right(Depth,1)) case 0 Depth = 2 ^ (asc(left(Depth, 1))) gfxSpex = True case 2 Depth = 2 ^ (asc(left(Depth, 1)) * 3) gfxSpex = True case 3 Depth = 2 ^ (asc(left(Depth, 1))) \\\'8 gfxSpex = True case 4 Depth = 2 ^ (asc(left(Depth, 1)) * 2) gfxSpex = True case 6 Depth = 2 ^ (asc(left(Depth, 1)) * 4) gfxSpex = True case else Depth = -1 end select else strBuff = GetBytes(flnm, 0, -1) \\\' Get all bytes from file lngSize = len(strBuff) flgFound = 0 strTarget = chr(255) & chr(216) & chr(255) flgFound = instr(strBuff, strTarget) if flgFound = 0 then exit function end if strImageType = "JPG" lngPos = flgFound + 2 ExitLoop = false do while ExitLoop = False and lngPos < lngSize do while asc(mid(strBuff, lngPos, 1)) = 255 and lngPos < lngSize lngPos = lngPos + 1 loop if asc(mid(strBuff, lngPos, 1)) < 192 or asc(mid(strBuff, lngPos, 1)) > 195 then lngMarkerSize = lngConvert2(mid(strBuff, lngPos + 1, 2)) lngPos = lngPos + lngMarkerSize + 1 else ExitLoop = True end if loop \\\' if ExitLoop = False then Width = -1 Height = -1 Depth = -1 else Height = lngConvert2(mid(strBuff, lngPos + 4, 2)) Width = lngConvert2(mid(strBuff, lngPos + 6, 2)) Depth = 2 ^ (asc(mid(strBuff, lngPos + 8, 1)) * 8) gfxSpex = True end if end if end function \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\'::: Test Harness ::: \\\'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: \\\' To test, we\\\'ll just try to show all files with a .GIF extension in the root of C: Set objFSO = CreateObject("Scripting.FileSystemObject") Set objF = objFSO.GetFolder("c:") Set objFC = objF.Files response.write "<table border=""0"" cellpadding=""5"">" For Each f1 in objFC if instr(ucase(f1.Name), ".GIF") then response.write "<tr><td>" & f1.name & "</td><td>" & f1.DateCreated & "</td><td>" & f1.Size & "</td><td>" if gfxSpex(f1.Path, w, h, c, strType) = true then response.write w & " x " & h & " " & c & " colors" else response.write " " end if response.write "</td></tr>" end if Next response.write "</table>" set objFC = nothing set objF = nothing set objFSO = nothing %> 返回类别: 教程 上一教程: 几个常用的小函数 下一教程: JMAIL.MESSAGE 您可以阅读与"利用FSO取得图像文件信息"相关的教程: · 利用FSO取得BMP，JPG，PNG，GIF文件信息 · 利用FSO取得BMP，JPG，PNG，GIF文件信息(大小，宽、高等) · 用FSO获得图片文件的信息(大小，宽，高) · 纯ASP上传图像文件到数据库的最佳例子 · 一个利用ADSI得到局域网信息的ASP文件 |
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