AspJpeg组件的用法

AspJpeg组件的用法ASPJPEG是一款功能相当强大的图象处理组件，用它可以轻松地做出图片的缩略图和为图片加上水印功能。

1、为图片制作缩略图<% ' 建立实例Dim Jpeg,PathSet Jpeg = Server.CreateObject("Persits.Jpeg")' 图片所在位置Path = Server.MapPath("images") & "\clock.jpg"' 打开Jpeg.Open Path' 设置缩略图大小（这里比例设定为50%）Jpeg.Width = Jpeg.OriginalWidth / 2Jpeg.Height = Jpeg.OriginalHeight / 2' 保存缩略图到指定文件夹下Jpeg.Save Server.MapPath("images") &"\clock_small.jpg"' 注销实例Set Jpeg = Nothing%><IMG SRC="images/clock.jpg"><P><IMG SRC="images/clock_small.jpg">2、为图片加入水印功能<%Dim Jpeg' 建立实例Set Jpeg = Server.CreateObject("Persits.Jpeg")' 打开目标图片Jpeg.Open Server.MapPath("images/dodge_viper.jpg") ' 添加文字水印Jpeg.Canvas.Font.Color = &HFF0000' 红色Jpeg.Canvas.Font.Family = "宋体"Jpeg.Canvas.Font.Bold = TrueJpeg.Canvas.Print 10, 10, "Copyright (c) " ' 保存文件Jpeg.SaveServer.MapPath("images/dodge_viper_framed.jpg")' 注销对象Set Jpeg = Nothing%>' Aspjpeg 功能设置Set Jpeg = Server.CreateObject("Persits.Jpeg")' 获取源图片路径Path =Server.MapPath("uploadimages/")&"/"&FileNam e' 打开源图片Jpeg.Open Path' 设定生成缩略图细节这里有很多种设定方法下面的方法是先判断宽高比然后按比例缩放If Jpeg.OriginalWidth / Jpeg.OriginalHeight > 1 then Jpeg.Width = 98Jpeg.Height =int((98/Jpeg.OriginalWidth)*Jpeg.OriginalHeight)elseif Jpeg.OriginalWidth / Jpeg.OriginalHeight < 1 then Jpeg.Width = 98Jpeg.Height= int((98/Jpeg.OriginalWidth)*Jpeg.Height) end if' 设定锐化效果Jpeg.Sharpen 1, 130' 向指定路径生成缩略图Jpeg.SaveServer.MapPath("uploadimages/")&"/small"&File NameASPJPEG文字水印对图片描边：<%Set Jpeg = Server.CreateObject("Persits.Jpeg")' 创建组件Jpeg.Open Server.MapPath("images.jpg")' 打开图片'也可以用OpenBinary读取二进制数据' 以下是写入水印文字Jpeg.Canvas.Font.Color = &H000000 ' 颜色,这里是设置成:黑Jpeg.Canvas.Font.Family = "宋体" 'family设置字体Jpeg.Canvas.Font.Bold = True '是否设置成粗体Jpeg.Canvas.Font.Size = 12 '字体大小Jpeg.Canvas.Print 100, 100, "" '在相应的位置打印文字，如果靠右可以用Jpeg.Canvas.Print Jpeg.width-160, Jpeg.height-30, ""Jpeg.Save Server.MapPath("images.jpg") 'OK,大功告成,输入保存!二、ASPJPEG对图片描边<%Set Jpeg = Server.CreateObject("Persits.Jpeg")' 创建组件Jpeg.Open Server.MapPath("images.jpg")' 打开图片'也可以用OpenBinary读取二进制数据'下面是对图片进行描边处理Jpeg.Canvas.Pen.Color = &H000000 ' 颜色Jpeg.Canvas.Pen.Width = 2 '描边像素:单位pixJpeg.Canvas.Brush.Solid = False ' 如果要描边,这里不能设成"真",否则整个区域会被填充为上面的颜色Jpeg.Canvas.Bar 1, 1, Jpeg.Width, Jpeg.Height '描边的位置及对应宽度Jpeg.Save Server.MapPath("images.jpg") 'OK,大功告成,输入保存!%>三、ASPJPEG改变图片大小，即缩略图功能：Set Jpeg = Server.CreateObject("Persits.Jpeg")Path = Server.MapPath("images") & "\clock.jpg" Jpeg.Open PathJpeg.Width = Jpeg.OriginalWidth / 2Jpeg.Height = Jpeg.OriginalHeight / 2'改变成原来的50%,Jpeg.Width,Jpeg.Height也可以给他准确的数值，比如Jpeg.Width=120Jpeg.Save Server.MapPath("images") &"\clock_small.jpg"%>然后在ASP代码里增加一点点代码即可，增加的位置可以放在上传图片完成后，取得图片地址，进行修改。

对于Z-Blog的使用者，直接将下面代码复制到c_system_lib.asp 文件的TUpLoadFile类中的Upload函数的结尾即可实现水印功能。

1、为图片加入水印功能Dim JpegSet Jpeg = Server.CreateObject("Persits.Jpeg") ' 建立对象Jpeg.Open BlogPath & "/upload/" & FileName ' 图片所在位置Jpeg.Canvas.Font.Color = &H000000 ' 颜色,这里是设置成:黑Jpeg.Canvas.Font.Family = "方正隶变简体" ' 设置字体Jpeg.Canvas.Font.Bold = False '是否设置成粗体Jpeg.Canvas.Font.Size = 26 '字体大小Jpeg.Canvas.Font.Quality = 4 ' 文字清晰度Jpeg.Canvas.PrintJpeg.OriginalWidth/2-170,Jpeg.OriginalHeight-30, "" '水印文字Jpeg.Save BlogPath & "/upload/" & FileName ' 保存文件Set Jpeg = Nothing2、为图片制作缩略图Dim JpegSet Jpeg = Server.CreateObject("Persits.Jpeg") ' 建立对象Jpeg.Open BlogPath & "/upload/" & FileName ' 图片所在位置Jpeg.Width = Jpeg.OriginalWidth / 2Jpeg.Height = Jpeg.OriginalHeight / 2' 设置缩略图大小（这里比例设定为50%），也可以给他准确的数值，比如Jpeg.Width=120Jpeg.Save BlogPath & "/upload/" & FileName ' 保存文件Set Jpeg = Nothing5、如何创建一个AspJpeg实例？Set Jpeg = Server.CreateObject("Persits.Jpeg")6、如何查看到期时间（是否注册成功）？Set Jpeg = Server.CreateObject("Persits.Jpeg") Response.Write Jpeg.Expires注册成功则到期时间为：9999-9-9否则为：安装日期加1个月期限7、如何用AspJpeg组件生成图片缩略图？以下是引用片段：<%Set Jpeg = Server.CreateObject("Persits.Jpeg") '创建实例Path = Server.MapPath("../images/apple.jpg") '处理图片路径Jpeg.Open Path '打开图片'调整宽度和高度为原来的50%Jpeg.Width = Jpeg.OriginalWidth / 2Jpeg.Height = Jpeg.OriginalHeight / 2Jpeg.Save Server.MapPath("apple_small.jpg") '保存图片到磁盘Jpeg.Close:Set Jpeg = Nothing%>8、如何用AspJpeg组件生成图片水印？以下是引用片段：<%Set Jpeg = Server.CreateObject("Persits.Jpeg") Jpeg.Open Server.MapPath("images/dodge_viper.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.SaveServer.MapPath("images/dodge_viper_framed.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 mustcreate 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 Xand Y offsets (in pixels):使用该方法，您必需创建两个AspJpeg实例对象以下是引用片段：<%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 omittedjpeg1.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. 以下是引用片段：<%Set Jpeg = Server.CreateObject("Persits.Jpeg")Jpeg.Open Server.MapPath("t.jpg")jpeg.Crop 20, 30, jpeg.Width - 20, jpeg.Height - 10jpeg.save Server.mappath("tt.jpg")Response.write("<img src=tt.jpg>")%>11、如何用AspJpeg组件创建安全码？创建安全码原理上和创建水印差不多。