| 标题 | asp.net 生成缩略图的实例源代码 |
| 范文 | using system; using system.data; using system.configuration; using system.web; using system.web.security; using system.web.ui; using system.web.ui.webcontrols; using system.web.ui.webcontrols.webparts; using system.web.ui.htmlcontrols; using system.io; using system.drawing; using system.drawing.imaging; /// /// 图片处理类 /// 1、生成缩略图片或按照比例改变图片的大小和画质 /// 2、将生成的缩略图放到指定的目录下 /// public class imageclass { public system.drawing.image resourceimage; private int imagewidth; private int imageheight; public string errmessage; /// /// 类的构造函数 /// /// 图片文件的全路径名称 public imageclass(string imagefilename) { resourceimage = system.drawing.image.fromfile(imagefilename); errmessage = ; } public bool thumbnailcallback() { return false; } /// /// 生成缩略图重载方法1，返回缩略图的image对象 /// /// 缩略图的宽度 /// 缩略图的高度 /// 缩略图的image对象 public system.drawing.image getreducedimage(int width, int height) { try { system.drawing.image reducedimage; system.drawing.image.getthumbnailimageabort callb = new system.drawing.image.getthumbnailimageabort(thumbnailcallback); reducedimage = resourceimage.getthumbnailimage(width, height, callb, intptr.zero); return reducedimage; } catch (exception e) { errmessage = e.message; return null; } } /// /// 生成缩略图重载方法2，将缩略图文件保存到指定的路径 /// /// 缩略图的宽度 /// 缩略图的高度 /// 缩略图保存的全文件名，(带路径)，参数格式：d:images ilename.jpg /// 成功返回true，否则返回false public bool getreducedimage(int width, int height, string targetfilepath) { try { system.drawing.image reducedimage; system.drawing.image.getthumbnailimageabort callb = new system.drawing.image.getthumbnailimageabort(thumbnailcallback); reducedimage = resourceimage.getthumbnailimage(width, height, callb, intptr.zero); reducedimage.save(@targetfilepath, imageformat.jpeg); reducedimage.dispose(); return true; } catch (exception e) { errmessage = e.message; return false; } } /// /// 生成缩略图重载方法3，返回缩略图的image对象 /// /// 缩略图的宽度百分比 如：需要百分之80，就填0.8 /// 缩略图的image对象 public system.drawing.image getreducedimage(double percent) { try { system.drawing.image reducedimage; system.drawing.image.getthumbnailimageabort callb = new system.drawing.image.getthumbnailimageabort(thumbnailcallback); imagewidth = convert.toint32(resourceimage.width * percent); imageheight = convert.toint32(resourceimage.width * percent); reducedimage = resourceimage.getthumbnailimage(imagewidth, imageheight, callb, intptr.zero); return reducedimage; } catch (exception e) { errmessage = e.message; return null; } } /// /// 生成缩略图重载方法4，返回缩略图的image对象 /// /// 缩略图的宽度百分比 如：需要百分之80，就填0.8 /// 缩略图保存的全文件名，(带路径)，参数格式：d:images ilename.jpg /// 成功返回true,否则返回false public bool getreducedimage(double percent, string targetfilepath) { try { system.drawing.image reducedimage; system.drawing.image.getthumbnailimageabort callb = new system.drawing.image.getthumbnailimageabort(thumbnailcallback); imagewidth = convert.toint32(resourceimage.width * percent); imageheight = convert.toint32(resourceimage.width * percent); reducedimage = resourceimage.getthumbnailimage(imagewidth, imageheight, callb, intptr.zero); reducedimage.save(@targetfilepath, imageformat.jpeg); reducedimage.dispose(); return true; } catch (exception e) { errmessage = e.message; return false; } } } |
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