.Net VB 圖片上傳後變橫的

爬了下文應該是因為exif資訊的問題，上傳前必須先判斷是否需要轉角度...找了一下總算找到相關內容參考

Public Function TestRotate(sImageFilePath As String) As Boolean
    Dim rft As RotateFlipType = RotateFlipType.RotateNoneFlipNone
    Dim img As Bitmap = Image.FromFile(sImageFilePath)
    Dim properties As PropertyItem() = img.PropertyItems
    Dim bReturn As Boolean = False
    For Each p As PropertyItem In properties
      If p.Id = 274 Then
        Dim orientation As Short = BitConverter.ToInt16(p.Value, 0)
        Select Case orientation
          Case 1
            rft = RotateFlipType.RotateNoneFlipNone
          Case 3
            rft = RotateFlipType.Rotate180FlipNone
          Case 6
           rft = RotateFlipType.Rotate90FlipNone
          Case 8
           rft = RotateFlipType.Rotate270FlipNone
        End Select
      End If
    Next
    If rft <> RotateFlipType.RotateNoneFlipNone Then
      img.RotateFlip(rft)
      System.IO.File.Delete(sImageFilePath)
      img.Save(sImageFilePath, System.Drawing.Imaging.ImageFormat.Jpeg)
      bReturn = True
    End If
    Return bReturn

  End Function

需要import
System.Drawing
System.Drawing.Imaging

RotateFlipType還有很多種，但手機似乎只會遇到以上狀況所以就只用到1、3、6、8

感謝幫助到我的原文，那邊也有C#的寫法

原文網址點我