1、什么是AspJpeg?
AspJpeg是一款功能强大的基于Microsoft IIS环境的图片处理组件,网络上对其进行详细和深入介绍的中文文章并不多,即使有一般也只是牵涉到图片缩略图和图片水印,这与其为英文版本有着密切的关系。
AspJpeg可以使用很少的代码在您的ASP/ASP.Net应用程序上动态的创建高质量的缩略图象,支持的图象格式有:JPEG, GIF, BMP, TIFF, PNG
AspJpeg可以做到:
图片合并
图片切割
图象特效
数据库支持
验证码技术
生成缩略图片
生成水印图片
GIF动态图片创建、修改
…
2、AspJpeg功能摘要
支持JPEG, GIF, BMP, TIFF 和 PNG 格式图片来源
图片可以来源于磁盘、内存、或者记录集(数据库)
调整后的图片可以保存到磁盘、内存、或者HTTP流
支持三种更改大小算法:Nearest Neighbor、Bilinear、Bicubic
可以在图片之上添加图画或者文字,支持TrueType和Type 1字体
词语自动换行,文本对齐方式:左、右、居中、两端,图片旋转
支持画中画
剪切,翻转,旋转,锐化,灰度调节
可以调节压缩比率,以得到最佳输出效果和大小
从JPEG图像中提取EXIF和的IPTC元数据
在更改图片的时候保存元数据
IPTC元数据的添加和编辑
CMYK到RGB转换
棕褐色滤境(老化相片样式)
从图象中对任意象素进行读/写存取
PNG Alpha 通道支持
GIF透明支持
亮度,对比度和饱和度的调整
GIF输出,透明度和动画保存
JPEG到GIF格式转换
3、AspJpeg系统需求
Windows NT/2000/XP/2003/Vista, and
IIS 4.0+ and ASP/ASP.NET, or
Visual Basic 5.0+, or
Visual C++ 5.0+, or
any development environment supporting COM.
4、AspJpeg安装
全新安装:
到官方网站下载30天全功能评估版本,分32位版(aspjpeg.exe,截止当前版本为2.0,文件大小:1.75M,最后更新日期:2008.01.28)和64位版(aspjpeg64.exe,截止当前版本为2.0,文件大小:1.35M,最后更新日期:2008.02.25,不包含文档)
执行下载的aspjpeg.exe或aspjpeg64.exe
在提示输入序列号的时候输入有效的序列号即可,不输入即代表将使用30天评估版本,可以更改注册表里的RegKey进行注册
如果安装位置磁盘格式为NTFS,则可能出现访问权限问题,需手工设置匿名用户有读取aspjpeg.exe的权限。
更新安装:
如果之前有装过其它版本的AspJpeg组件,则需要先卸载原来的组件,再进行新版本的安装。
先停止IIS:Net Stop iisadmin /y
卸载旧版组件:regsvr32 /u Path/aspjpeg.dl(Path为安装路径)
重启IIS:Net Start w3svc
然后再进行全新安装或复制Bin目录下的AspJpeg.dll文件到安装目录进行手工安装:
程序代码
regsvr32 Path/aspjpeg.dll(Path为安装路径)
如果在正常安装过程中没有输入序列号或更新安装则需要在注册表中加入以下项进行注册,为方便起见您可以直接将以下代码保存为key.reg文档并导入注册表:
程序代码
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINESoftwarePersits SoftwareAspJpegRegKey] @="17361-38566-42221"
另外,可以通过代码层由ASPJpeg对象的RegKey属性来设定注册码,如下:
view plaincopy to clipboardprint? Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.RegKey = "12345-67890-12345" ... view plaincopy to clipboardprint? Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.RegKey = "12345-67890-12345" ... Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.RegKey = "12345-67890-12345" ...
.RegKey指定注册表,如果这个属性没有设置AspJpeg组件将在系统注册表中寻找一个指定的注册码.
5、如何创建一个AspJpeg实例?
程序代码
Set Jpeg = Server.CreateObject(“Persits.Jpeg”)
6、如何查看到期时间(是否注册成功)?
view plaincopy to clipboardprint? Set Jpeg = Server.CreateObject("Persits.Jpeg") Response.Write Jpeg.Expires view plaincopy to clipboardprint? Set Jpeg = Server.CreateObject("Persits.Jpeg") Response.Write Jpeg.Expires Set Jpeg = Server.CreateObject("Persits.Jpeg") Response.Write Jpeg.Expires
如果这个属性返回9/9/9999它意味着在使用一个永久的注册码。
否则为:安装日期加1个月期限
7、如何用AspJpeg组件创建图片缩略图?
<% Set Jpeg = Server.CreateObject("Persits.Jpeg") '创建ASPJpeg对象实例 Path = Server.MapPath("../images/apple.jpg") '设置图片路径 Jpeg.Open Path '打开图片 '调整宽度和高度为原来的50% Jpeg.Width = Jpeg.OriginalWidth / 2 Jpeg.Height = Jpeg.OriginalHeight / 2 Jpeg.Save Server.MapPath("apple_small.jpg") '保存图片到磁盘 Jpeg.Close:Set Jpeg = Nothing %> <% Set Jpeg = Server.CreateObject("Persits.Jpeg") '创建ASPJpeg对象实例 Path = Server.MapPath("../images/apple.jpg") '设置图片路径 Jpeg.Open Path '打开图片 '调整宽度和高度为原来的50% Jpeg.Width = Jpeg.OriginalWidth / 2 Jpeg.Height = Jpeg.OriginalHeight / 2 Jpeg.Save Server.MapPath("apple_small.jpg") '保存图片到磁盘 Jpeg.Close:Set Jpeg = Nothing %> <% Set Jpeg = Server.CreateObject("Persits.Jpeg") '创建ASPJpeg对象实例 Path = Server.MapPath("../images/apple.jpg") '设置图片路径 Jpeg.Open Path '打开图片 '调整宽度和高度为原来的50% Jpeg.Width = Jpeg.OriginalWidth / 2 Jpeg.Height = Jpeg.OriginalHeight / 2 Jpeg.Save Server.MapPath("apple_small.jpg") '保存图片到磁盘 Jpeg.Close:Set Jpeg = Nothing %>
8、如何用AspJpeg组件创建图片水印?
<% Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.Open Server.MapPath("2.jpg") '开始写文字 Jpeg.Canvas.Font.Color = &000000 'red 颜色 Jpeg.Canvas.Font.Family = "Courier New" '字体 Jpeg.Canvas.Font.Bold = True '是否加粗 Jpeg.Canvas.Print 10, 10, "Copyright (c) XYZ, Inc." '打印坐标x 打印坐标y 需要打印的字符 '以下是对图片进行边框处理 Jpeg.Canvas.Pen.Color = &H000000 'black 颜色 Jpeg.Canvas.Pen.Width = 2 '画笔宽度 Jpeg.Canvas.Brush.Solid = False '是否加粗处理 Jpeg.Canvas.Bar 1, 1, Jpeg.Width, Jpeg.Height '起始X坐标 起始Y坐标 输入长度 输入高度 Jpeg.Save Server.MapPath("1.jpg") '保存 %> <% Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.Open Server.MapPath("2.jpg") '开始写文字 Jpeg.Canvas.Font.Color = &000000 'red 颜色 Jpeg.Canvas.Font.Family = "Courier New" '字体 Jpeg.Canvas.Font.Bold = True '是否加粗 Jpeg.Canvas.Print 10, 10, "Copyright (c) XYZ, Inc." '打印坐标x 打印坐标y 需要打印的字符 '以下是对图片进行边框处理 Jpeg.Canvas.Pen.Color = &H000000 'black 颜色 Jpeg.Canvas.Pen.Width = 2 '画笔宽度 Jpeg.Canvas.Brush.Solid = False '是否加粗处理 Jpeg.Canvas.Bar 1, 1, Jpeg.Width, Jpeg.Height '起始X坐标 起始Y坐标 输入长度 输入高度 Jpeg.Save Server.MapPath("1.jpg") '保存 %> <% Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.Open Server.MapPath("2.jpg") '开始写文字 Jpeg.Canvas.Font.Color = &000000 'red 颜色 Jpeg.Canvas.Font.Family = "Courier New" '字体 Jpeg.Canvas.Font.Bold = True '是否加粗 Jpeg.Canvas.Print 10, 10, "Copyright (c) XYZ, Inc." '打印坐标x 打印坐标y 需要打印的字符 '以下是对图片进行边框处理 Jpeg.Canvas.Pen.Color = &H000000 'black 颜色 Jpeg.Canvas.Pen.Width = 2 '画笔宽度 Jpeg.Canvas.Brush.Solid = False '是否加粗处理 Jpeg.Canvas.Bar 1, 1, Jpeg.Width, Jpeg.Height '起始X坐标 起始Y坐标 输入长度 输入高度 Jpeg.Save Server.MapPath("1.jpg") '保存 %>
9、如何用AspJpeg组件进行图片合并?
AspJpeg 1.3+ enables you to place images on top of each other via the method DrawImage. To use this method, you must create two instances of the AspJpeg objects and populate both of them with images via calls to Open (or OpenBinary). When calling Canvas.DrawImage, the 2nd instance of AspJpeg is passed as an argument to this method, along with the X and Y offsets (in pixels):
使用该方法,您必需创建两个AspJpeg实例对象
<% Set Jpeg1 = Server.CreateObject("Persits.Jpeg") Set Jpeg2 = Server.CreateObject("Persits.Jpeg") Jpeg1.Open Server.MapPath("t.jpg") Jpeg2.Open Server.MapPath("t1.jpg") Jpeg1.Canvas.DrawImage 10, 10, Jpeg2 ' optional arguments omitted jpeg1.save Server.mappath("tt.jpg") %> <% Set Jpeg1 = Server.CreateObject("Persits.Jpeg") Set Jpeg2 = Server.CreateObject("Persits.Jpeg") Jpeg1.Open Server.MapPath("t.jpg") Jpeg2.Open Server.MapPath("t1.jpg") Jpeg1.Canvas.DrawImage 10, 10, Jpeg2 ' optional arguments omitted jpeg1.save Server.mappath("tt.jpg") %> <% Set Jpeg1 = Server.CreateObject("Persits.Jpeg") Set Jpeg2 = Server.CreateObject("Persits.Jpeg") Jpeg1.Open Server.MapPath("t.jpg") Jpeg2.Open Server.MapPath("t1.jpg") Jpeg1.Canvas.DrawImage 10, 10, Jpeg2 ' optional arguments omitted jpeg1.save Server.mappath("tt.jpg") %>
10、如何用AspJpeg组件进行图片切割?
AspJpeg 1.1+ is also capable of cutting off edges from, or cropping, the resultant thumbnails via the method Crop(x0, y0, x1, y1). The size of the cropped image is specified by the coordinates of the upper-left and lower-right corners within the resultant thumbnail, not the original large image.
<% Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.Open Server.MapPath("t.jpg") jpeg.Crop 20, 30, jpeg.Width - 20, jpeg.Height - 10 jpeg.save Server.mappath("tt.jpg") Response.write("<img src=tt.jpg>") %> <% Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.Open Server.MapPath("t.jpg") jpeg.Crop 20, 30, jpeg.Width - 20, jpeg.Height - 10 jpeg.save Server.mappath("tt.jpg") Response.write("<img src=tt.jpg>") %> <% Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.Open Server.MapPath("t.jpg") jpeg.Crop 20, 30, jpeg.Width - 20, jpeg.Height - 10 jpeg.save Server.mappath("tt.jpg") Response.write("<img src=tt.jpg>") %>
11、如何用AspJpeg组件创建验证码?
创建验证码原理上和创建水印差不多。
<% function make_randomize(max_len,w_n) 'max_len 生成长度,w_n:0 可能包含字母,1:只为数字 randomize for intcounter=1 to max_len whatnext=int((1-0+1)*rnd+w_n) if whatnext=0 then upper=122 lower=97 else upper=57 lower=48 end if strnewpass=strnewpass & chr(int((upper-lower+1)*rnd)+lower) next make_randomize=strnewpass end function '生成安全码的图片。 random_num=make_randomize(4,1) '生成4位数字的安全码 session("random_num")=random_num '为么调用session,没有session的安全码是完全没有意义的。呵呵 . Set Jpeg = Server.CreateObject("Persits.Jpeg") '调用组件 Jpeg.Open Server.MapPath("t.jpg") '打开准备的图片 Jpeg.Canvas.Font.Color = &HFFFFFF Jpeg.Canvas.Font.Family = "Arial Black" Jpeg.Canvas.Font.Bold = false Jpeg.Canvas.PrintText 0, -2, random_num jpeg.save Server.MapPath("tt.jpg") '保存 %> <img src="tt.jpg" border="0" align="absmiddle"> <% function make_randomize(max_len,w_n) 'max_len 生成长度,w_n:0 可能包含字母,1:只为数字 randomize for intcounter=1 to max_len whatnext=int((1-0+1)*rnd+w_n) if whatnext=0 then upper=122 lower=97 else upper=57 lower=48 end if strnewpass=strnewpass & chr(int((upper-lower+1)*rnd)+lower) next make_randomize=strnewpass end function '生成安全码的图片。 random_num=make_randomize(4,1) '生成4位数字的安全码 session("random_num")=random_num '为么调用session,没有session的安全码是完全没有意义的。呵呵 . Set Jpeg = Server.CreateObject("Persits.Jpeg") '调用组件 Jpeg.Open Server.MapPath("t.jpg") '打开准备的图片 Jpeg.Canvas.Font.Color = &HFFFFFF Jpeg.Canvas.Font.Family = "Arial Black" Jpeg.Canvas.Font.Bold = false Jpeg.Canvas.PrintText 0, -2, random_num jpeg.save Server.MapPath("tt.jpg") '保存 %> <img src="tt.jpg" border="0" align="absmiddle"> <% function make_randomize(max_len,w_n) 'max_len 生成长度,w_n:0 可能包含字母,1:只为数字 randomize for intcounter=1 to max_len whatnext=int((1-0+1)*rnd+w_n) if whatnext=0 then upper=122 lower=97 else upper=57 lower=48 end if strnewpass=strnewpass & chr(int((upper-lower+1)*rnd)+lower) next make_randomize=strnewpass end function '生成安全码的图片。 random_num=make_randomize(4,1) '生成4位数字的安全码 session("random_num")=random_num '为么调用session,没有session的安全码是完全没有意义的。呵呵 . Set Jpeg = Server.CreateObject("Persits.Jpeg") '调用组件 Jpeg.Open Server.MapPath("t.jpg") '打开准备的图片 Jpeg.Canvas.Font.Color = &HFFFFFF Jpeg.Canvas.Font.Family = "Arial Black" Jpeg.Canvas.Font.Bold = false Jpeg.Canvas.PrintText 0, -2, random_num jpeg.save Server.MapPath("tt.jpg") '保存 %> <img src="tt.jpg" border="0" align="absmiddle">
12、如何让AspJpeg组件支援数据库?
图片存进数据库只能以二进制数据保存,这里即利用AspJpeg的Binary方法,下面以两个AspJpeg用户手册上的代码为例,具体请参考AspJpeg用户手册:
'输出到内存 <% ... Set rs = Server.CreateObject("adodb.recordset") rs.Open "images", strConnect, 1, 3 rs.AddNew rs("image_blob").Value = Jpeg.Binary rs.Update ... %> '从内存中打开图象 Opening Images from Memory <% ' Using ADO, open database with an image blob strC & Server.MapPath("../db/aspjpeg.mdb") Set rs = Server.CreateObject("adodb.recordset") SQL = "select image_blob from images2 where id = " & Request("id") rs.Open SQL, strConnect, 1, 3 Set Jpeg = Server.CreateObject("Persits.Jpeg") ' Open image directly from recordset Jpeg.OpenBinary rs("image_blob").Value ' Resize jpeg.Width = Request("Width") ' Set new height, preserve original aspect ratio jpeg.Height = jpeg.OriginalHeight * jpeg.Width / jpeg.OriginalWidth Jpeg.SendBinary rs.Close %> '输出到内存 <% ... Set rs = Server.CreateObject("adodb.recordset") rs.Open "images", strConnect, 1, 3 rs.AddNew rs("image_blob").Value = Jpeg.Binary rs.Update ... %> '从内存中打开图象 Opening Images from Memory <% ' Using ADO, open database with an image blob strC & Server.MapPath("../db/aspjpeg.mdb") Set rs = Server.CreateObject("adodb.recordset") SQL = "select image_blob from images2 where id = " & Request("id") rs.Open SQL, strConnect, 1, 3 Set Jpeg = Server.CreateObject("Persits.Jpeg") ' Open image directly from recordset Jpeg.OpenBinary rs("image_blob").Value ' Resize jpeg.Width = Request("Width") ' Set new height, preserve original aspect ratio jpeg.Height = jpeg.OriginalHeight * jpeg.Width / jpeg.OriginalWidth Jpeg.SendBinary rs.Close %> '输出到内存 <% ... Set rs = Server.CreateObject("adodb.recordset") rs.Open "images", strConnect, 1, 3 rs.AddNew rs("image_blob").Value = Jpeg.Binary rs.Update ... %>
13、AspJpeg组件创建GIF动画?
<% Set Jpeg = Server.CreateObject("Persits.Jpeg") Set Gif = Jpeg.Gif ' Obtain GIF management object MarketShare = 6 ' initial market share of hypothetical XYZ company ' create a 5-frame animated gif For i = 1 to 5 Gif.AddFrame 300, 200, 0, 0 Gif.PenColor = 10 Gif.BrushColor = 10 Gif.DrawBar 0, 0, 300, 200 Gif.PenColor = 201 Gif.F Gif.PrintText 18, 15, "XYZ, Inc. Market Share" Gif.PrintText 120, 50, 2002 + i ' Draw pie chart Gif.PenColor = 0 Gif.BrushColor = 30 Gif.DrawPie 150, 130, 50, 0, MarketShare * 360 / 100 Gif.BrushColor = 20 Gif.DrawPie 150, 130, 50, MarketShare * 360 / 100, 360 Gif.PenColor = 210 Gif.PrintText 200, 100, MarketShare & "%" MarketShare = MarketShare * 2 - 3 ' market share almost doubles every year! ' increase delay on the last frame if i = 5 then Gif.Delay = 300 ' 3 sec Next ' Save Gif.Save Server.MapPath("chart.gif") %> <IMG SRC="chart.gif"> <% Set Jpeg = Server.CreateObject("Persits.Jpeg") Set Gif = Jpeg.Gif ' Obtain GIF management object MarketShare = 6 ' initial market share of hypothetical XYZ company ' create a 5-frame animated gif For i = 1 to 5 Gif.AddFrame 300, 200, 0, 0 Gif.PenColor = 10 Gif.BrushColor = 10 Gif.DrawBar 0, 0, 300, 200 Gif.PenColor = 201 Gif.F Gif.PrintText 18, 15, "XYZ, Inc. Market Share" Gif.PrintText 120, 50, 2002 + i ' Draw pie chart Gif.PenColor = 0 Gif.BrushColor = 30 Gif.DrawPie 150, 130, 50, 0, MarketShare * 360 / 100 Gif.BrushColor = 20 Gif.DrawPie 150, 130, 50, MarketShare * 360 / 100, 360 Gif.PenColor = 210 Gif.PrintText 200, 100, MarketShare & "%" MarketShare = MarketShare * 2 - 3 ' market share almost doubles every year! ' increase delay on the last frame if i = 5 then Gif.Delay = 300 ' 3 sec Next ' Save Gif.Save Server.MapPath("chart.gif") %> <IMG SRC="chart.gif">