VB.NET中怎么實現(xiàn)一個縮略圖案,相信很多沒有經(jīng)驗的人對此束手無策,為此本文總結(jié)了問題出現(xiàn)的原因和解決方法,通過這篇文章希望你能解決這個問題。
創(chuàng)新互聯(lián)建站網(wǎng)站建設公司是一家服務多年做網(wǎng)站建設策劃設計制作的公司,為廣大用戶提供了成都做網(wǎng)站、成都網(wǎng)站建設,成都網(wǎng)站設計,1元廣告,成都做網(wǎng)站選創(chuàng)新互聯(lián)建站,貼合企業(yè)需求,高性價比,滿足客戶不同層次的需求一站式服務歡迎致電。
VB.NET實現(xiàn)縮略圖代碼:
Public Class ClassUpPic Private vPicFile As System.Web.UI.HtmlControls.HtmlInputFile Private vSmallPicSize, vUpFileSize As Integer Private vUpPicPath, vNewPicName, vTmpPicName As String Private PicMin, PicMax, vPicMax As System.Drawing.Image Private PicFormat As System.Drawing.Imaging.ImageFormat Private MinHeight, MinWidth As Decimal Private Myfile As IO.File Public Sub New(ByVal PicFile As System.Web.UI.HtmlControls.HtmlInputFile, ByVal UpPicType As PicType) vPicFile = PicFile vUpFileSize = HttpContext.Current.Application("UpFileSize") Select Case UpPicType Case PicType.Face vUpPicPath = "upload/images/Face" vSmallPicSize = 150 vNewPicName = HttpContext.Current.Session("MemberID") & "." & GetRightByChar(vPicFile.PostedFile.FileName, ".") Case PicType.Photo vUpPicPath = "upload/images/Photo" vSmallPicSize = 150 vNewPicName = System.Guid.NewGuid.ToString() & "." & GetRightByChar(vPicFile.PostedFile.FileName, ".") Case PicType.Pic vUpPicPath = "upload/images/Pic" vSmallPicSize = 550 vNewPicName = System.Guid.NewGuid.ToString() & "." & GetRightByChar(vPicFile.PostedFile.FileName, ".") End Select End Sub Public Function GetSavedFileName() As String '檢驗圖片類型================================================================= If vPicFile.PostedFile.FileName = "" Then Throw New NotSupportedException("文件為空,請您選擇上傳的圖片文件!") End If If Left(vPicFile.PostedFile.ContentType, 5) <> "image" Then Throw New NotSupportedException("文件格式不合法,請選取有效的圖片文件!" & vPicFile.PostedFile.ContentType) End If If vPicFile.PostedFile.ContentLength > vUpFileSize Then Dim MaxNumber As Decimal = vUpFileSize / 1024 / 1024 Throw New NotSupportedException("上傳的圖片文件太大,***支持" & Format(MaxNumber, "##,##0") & "M!") End If '檢驗數(shù)量限制================================================================= '保存大文件================================================================= vPicFile.PostedFile.SaveAs(HttpContext.Current.Server.MapPath(vUpPicPath & "/max/") & vNewPicName) vPicFile.Dispose() '縮略圖片文件================================================================= PicMax = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(vUpPicPath & "/max/") & vNewPicName) If Not (PicMax.RawFormat Is PicFormat.Gif Or PicMax.RawFormat Is PicFormat.Png) Then If PicMax.Height > vSmallPicSize Or PicMax.Width > vSmallPicSize Then vTmpPicName = System.Guid.NewGuid.ToString() & ".png" vPicMax = PicMax PicMax.Save(HttpContext.Current.Server.MapPath(vUpPicPath & "/max/") & vTmpPicName, PicFormat.Png) vPicMax.Dispose() PicMax = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(vUpPicPath & "/max/") & vTmpPicName) End If End If '保存小文件================================================================= GetMinPic(PicMax).Save(HttpContext.Current.Server.MapPath(vUpPicPath & "/min/") & vNewPicName, PicFormat.Jpeg) PicMax.Dispose() '刪除臨時png文件================================================================= If vTmpPicName <> "" Then Myfile.Delete(HttpContext.Current.Server.MapPath(vUpPicPath & "/max/") & vTmpPicName) Return vNewPicName End Function Private Function GetMinPic(ByVal MaxPic As System.Drawing.Image) As System.Drawing.Image If MaxPic.Height > vSmallPicSize Or MaxPic.Width > vSmallPicSize Then If MaxPic.Height > MaxPic.Width Then MinWidth = MaxPic.Width / (MaxPic.Height / vSmallPicSize) MinHeight = vSmallPicSize Else MinWidth = vSmallPicSize MinHeight = MaxPic.Height / (MaxPic.Width / vSmallPicSize) End If Return MaxPic.GetThumbnailImage(CInt(MinWidth), CInt(MinHeight), Nothing, New System.IntPtr()) Else Return MaxPic End If End Function Enum PicType Face = 1 Photo = 2 Pic = 3 End Enum Private Function GetRightByChar(ByVal StrValue As String, ByVal CharValue As String) As String Dim MyStr() As String = Split(StrValue, CharValue) Return MyStr(MyStr.Length - 1) End Function End Class
看完上述內(nèi)容,你們掌握VB.NET中怎么實現(xiàn)一個縮略圖案的方法了嗎?如果還想學到更多技能或想了解更多相關(guān)內(nèi)容,歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道,感謝各位的閱讀!
當前題目:VB.NET中怎么實現(xiàn)一個縮略圖案
分享URL:http://muchs.cn/article32/joghsc.html
成都網(wǎng)站建設公司_創(chuàng)新互聯(lián),為您提供企業(yè)建站、定制開發(fā)、移動網(wǎng)站建設、網(wǎng)站建設、網(wǎng)站制作、建站公司
聲明:本網(wǎng)站發(fā)布的內(nèi)容(圖片、視頻和文字)以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主,如果涉及侵權(quán)請盡快告知,我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場,如需處理請聯(lián)系客服。電話:028-86922220;郵箱:631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載,或轉(zhuǎn)載時需注明來源: 創(chuàng)新互聯(lián)