NET图片上传类（支持任何大小的缩略图）代码,CSharp代码库,德仔网

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【CSharp】 NET图片上传类（支持任何大小的缩略图）
作者:Dezai.CN / 发布于2012/2/7/ 745
<div>using System;</div>
<div>using System.Web;</div>
<div>using System.Drawing;</div>
<div>using System.Threading;</div>
<div></div>
<div>namespace Happy2006.Web.Utility</div>
<div>{</div>
<div>/// <summary></div>
<div>/// FileUpload 的摘要说明。</div>
<div>/// 支持缩略图的图片上传类，若不传图片则无缩略图支持</div>
<div>/// path里可以用 / 表示分割，其他不支持 ;/ 会自动转换为 /</div>
<div>/// </summary></div>
<div>public class FileUpload</div>
<div>{</div>
<div> public static System.Web.UI.Page objPage;</div>
<div> private string m_strDestPath="";</div>
<div> private string m_strThumbDestPath="";</div>
<div> private int m_nThumbWidth=0;</div>
<div> private int m_nThumbHeight=0;</div>
<div> private long m_nMaxSize=0;</div>
<div> private string m_strPreFixThumb="";</div>
<div> private static FileUpload m_objFileUpload;</div>
<div> private static Object m_classLock=typeof(FileUpload);</div>
<div> public static FileUpload getInstance(long nMaxFileSize,string strDestPath)</div>
<div> {</div>
<div> objPage= (System.Web.UI.Page)System.Web.HttpContext.Current.Handler ;</div>
<div> if (null==objPage)</div>
<div> {</div>
<div> return null;</div>
<div> }
<div> lock(m_classLock)</div>
<div> {</div>
<div> if(null==m_objFileUpload)</div>
<div> {</div>
<div> m_objFileUpload= new FileUpload( nMaxFileSize, strDestPath);</div>
<div> }
<div> }
<div> return m_objFileUpload;</div>
<div> }
<div> public static FileUpload getInstance(</div>
<div> long nMaxFileSize,</div>
<div> string strDestPath,</div>
<div> string strThumbDestPath,</div>
<div> int nThumbWidth,</div>
<div> int nThumbHeight,</div>
<div> string strPreFixThumb</div>
<div> )</div>
<div> {</div>
<div> objPage= (System.Web.UI.Page)System.Web.HttpContext.Current.Handler ;</div>
<div> if (null==objPage)</div>
<div> {</div>
<div> return null;</div>
<div> }
<div> lock(m_classLock)</div>
<div> {</div>
<div> if(null==m_objFileUpload)</div>
<div> {</div>
<div> m_objFileUpload=</div>
<div> new FileUpload(</div>
<div> nMaxFileSize,</div>
<div> strDestPath,</div>
<div> strThumbDestPath,</div>
<div> nThumbWidth,</div>
<div> nThumbHeight,</div>
<div> strPreFixThumb</div>
<div> );</div>
<div> }
<div> }
<div> return m_objFileUpload;</div>
<div> }
<div> /// <summary></div>
<div> /// 路径格式转换为正确格式</div>
<div> /// </summary></div>
<div> /// <param name="strPath"></param></div>
<div> /// <returns></returns></div>
<div> private string PathFormat(string strPath)</div>
<div> {</div>
<div> string strReturn=strPath;</div>
<div> if (strReturn.Length<=0)</div>
<div> {</div>
<div> return "";</div>
<div> }
<div> strReturn=strReturn.Replace("//","/");</div>
<div> if(strReturn.Substring(strReturn.Length-1)!= "/")</div>
<div> {</div>
<div> strReturn+="/";</div>
<div> }
<div> return strReturn;</div>
<div> }
<div> /// <summary></div>
<div> ///</div>
<div> /// </summary></div>
<div> /// <param name="nMaxFileSize">限制最大文件大小</param></div>
<div> /// <param name="strDestPath">文件上传目的路径</param></div>
<div></div>
<div> public FileUpload(long nMaxFileSize,string strDestPath)</div>
<div> {</div>
<div> m_strDestPath=PathFormat(strDestPath);</div>
<div> m_nMaxSize=nMaxFileSize;</div>
<div> }
<div> /// <summary></div>
<div> ///</div>
<div> /// </summary></div>
<div> /// <param name="nMaxFileSize">单位KB</param></div>
<div> /// <param name="strDestPath"></param></div>
<div> /// <param name="strThumbDestPath">缩略图路径，为空串时，不生成缩略图</param></div>
<div> /// <param name="nThumbWidth"></param></div>
<div> /// <param name="nThumbHeight"></param></div>
<div> /// <param name="strPreFixThumb">缩略图前缀</param></div>
<div> public FileUpload(long nMaxFileSize,</div>
<div> string strDestPath,</div>
<div> string strThumbDestPath,</div>
<div> int nThumbWidth,</div>
<div> int nThumbHeight,</div>
<div> string strPreFixThumb)</div>
<div> {</div>
<div> m_strDestPath=PathFormat(strDestPath);</div>
<div> m_nMaxSize=nMaxFileSize;</div>
<div> m_strThumbDestPath=PathFormat(strThumbDestPath);</div>
<div> m_nThumbHeight=nThumbHeight;</div>
<div> m_nThumbWidth=nThumbWidth;</div>
<div> m_strPreFixThumb=strPreFixThumb;</div>
<div> }
<div> public bool Upload(string strFileInputBoxID,</div>
<div> string strDestFileName,</div>
<div> out long nSrcFileSize,</div>
<div> out string strSrcFileName,</div>
<div> out string strSrcFileExt,</div>
<div> out string strError)</div>
<div> {</div>
<div> nSrcFileSize=0;</div>
<div> strSrcFileName="";</div>
<div> strSrcFileExt="";</div>
<div> strError="";</div>
<div> System.Web.UI.HtmlControls.HtmlInputFile objFileCtrl=(System.Web.UI.HtmlControls.HtmlInputFile)objPage.FindControl(strFileInputBoxID);</div>
<div> if (null==objFileCtrl)</div>
<div> {</div>
<div> strError="没有页对象PAGE";</div>
<div> return false;</div>
<div> }
<div> if (objFileCtrl.PostedFile.ContentLength==0)</div>
<div> {</div>
<div> strError="上传文件内容为空";</div>
<div> return false;</div>
<div> }
<div> if(m_nMaxSize<=nSrcFileSize && m_nMaxSize>0)</div>
<div> {</div>
<div> strError="上传文件太大:"+m_nMaxSize.ToString() +" < "+ nSrcFileSize.ToString();</div>
<div> return false;</div>
<div> }
<div> nSrcFileSize=(objFileCtrl.PostedFile.ContentLength/1024);</div>
<div> strSrcFileName=objFileCtrl.PostedFile.FileName;</div>
<div> strSrcFileExt=strSrcFileName.Substring(strSrcFileName.LastIndexOf(".")+1);</div>
<div> try</div>
<div> {</div>
<div> objFileCtrl.PostedFile.SaveAs( m_strDestPath + strDestFileName + "."+ strSrcFileExt);</div>
<div> }
<div> catch</div>
<div> {</div>
<div> strError="上传文件保存失败，请查看["+ m_strDestPath + "]路径是否可写";</div>
<div> return false;</div>
<div> }
<div> int nSrcWidth,nSrcHeight;</div>
<div> if (m_strThumbDestPath.Length>0)</div>
<div> {</div>
<div> if(false==GenerateThumb(m_strDestPath + strDestFileName + "."+ strSrcFileExt ,</div>
<div> m_strThumbDestPath,</div>
<div> m_strPreFixThumb+"_" + strDestFileName + "."+ strSrcFileExt ,</div>
<div> m_nThumbWidth,</div>
<div> m_nThumbHeight,</div>
<div> out nSrcWidth,</div>
<div> out nSrcHeight,</div>
<div> out strError))</div>
<div> {</div>
<div> return false;</div>
<div> }
<div> }
<div> return true;</div>
<div> }
<div> /// <summary></div>
<div> ///</div>
<div> /// </summary></div>
<div> /// <param name="strSrcFilePathName">文件源</param></div>
<div> /// <param name="strDestPath">缩略图路径</param></div>
<div> /// <param name="strDestFileName">小图文件名包括扩展名</param></div>
<div> /// <param name="nDestWidth">为0时以nDestHeight为标准</param></div>
<div> /// <param name="nDestHeight">为0时以nDestWidth为标准</param></div>
<div> /// <param name="strError">返回的错误信息</param></div>
<div> /// <returns></returns></div>
<div> private bool GenerateThumb( string strSrcFilePathName,</div>
<div> string strDestPath,</div>
<div> string strDestFileName,</div>
<div> int nDestWidth,</div>
<div> int nDestHeight,</div>
<div> out int nSrcWidth,</div>
<div> out int nSrcHeight,</div>
<div> out string strError)</div>
<div> {</div>
<div> //'生成缩略图</div>
<div> int nWidth=nDestWidth;</div>
<div> int nHeight=nDestHeight;</div>
<div> nSrcWidth=0;</div>
<div> nSrcHeight=0;</div>
<div> strError="";</div>
<div> System.Drawing.Image objImg=System.Drawing.Image.FromFile(strSrcFilePathName);</div>
<div> if (null==objImg)</div>
<div> {</div>
<div> strError="原图不存在";</div>
<div> return false;</div>
<div> }
<div> nSrcWidth=objImg.Width;</div>
<div> nSrcHeight=objImg.Height;</div>
<div> if (0==nWidth)</div>
<div> {</div>
<div> nWidth=Convert.ToInt32((Convert.ToDouble(nSrcWidth)/Convert.ToDouble(nSrcHeight)*nHeight));</div>
<div> }
<div> if (0==nHeight)</div>
<div> {</div>
<div> nHeight=Convert.ToInt32((Convert.ToDouble(nSrcHeight)/Convert.ToDouble(nSrcWidth)*nWidth));</div>
<div> }
<div> System.Drawing.Image objImgReturn;</div>
<div> try</div>
<div> {</div>
<div> System.Drawing.Image.GetThumbnailImageAbort objFunctionCall=null;</div>
<div> objImgReturn</div>
<div> =objImg.GetThumbnailImage(nWidth,nHeight,objFunctionCall,new System.IntPtr());</div>
<div> objImgReturn.Save(strDestPath+strDestFileName);</div>
<div> }
<div> catch</div>
<div> {</div>
<div> strError="生成缩略图失败！确认路径可写["+ strDestPath+strDestFileName +"],预生成大小为 "+ nWidth.ToString() +" x "+ nHeight.ToString()+" "+ nSrcHeight.ToString() + " " ;</div>
<div> return false;</div>
<div> }
<div> objImg.Dispose();</div>
<div> objImgReturn.Dispose();</div>
<div> return true;</div>
<div> }
<div>}
<div>}
<div></div>
<div>代码调用：</div>
<div> Happy2006.Web.Utility.FileUpload objFile;</div>
<div> if(!chkThumb.Checked)//是否支持缩略图生成</div>
<div> {</div>
<div> objFile=Happy2006.Web.Utility.FileUpload.getInstance(0,</div>
<div> Server.MapPath(@"/Happy2006WebTest/TestFile"));</div>
<div> }else</div>
<div> {</div>
<div> objFile=Happy2006.Web.Utility.FileUpload.getInstance(0,</div>
<div> Server.MapPath(@"/Happy2006WebTest/TestFile"),</div>
<div> @"D:/Happy2006/TestFile",120,0,"thumb");</div>
<div> }
<div></div>
<div> string strFileName;</div>
<div> long nFileSize;</div>
<div> string strError;</div>
<div> string strFileExt;</div>
<div> if (null!=objFile)</div>
<div> {</div>
<div> objFile.Upload("fileupload","xxxx",out nFileSize,out strFileName,out strFileExt,out strError);</div>
<div> Response.Write(strError);</div>
<div> }
</div>
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