即使在处理位图后我也无法删除位图源文件。 [英] I cannot delete a bitmap source file even after disposing the bitmap.

问题描述

我想更改图像属性项，然后将图像源的文件名更改为图像日期的形式。当我在重命名副本后尝试删除原始图像时，我收到通常的消息：访问路径'H：\Photos \ Test Folder \ MBR_1.JPG'被拒绝。这个问题的常见答案是处理图像。我做了，但我仍然得到了消息。如果代码看起来很有趣，那是因为它是VB.NET。



我尝试过：

I want to change an image property item and then change the filename of the image source to a form of the date of the image. When I try to delete the original image after renaming a copy, I get the usual message: "Access to the path 'H:\Photos\Test Folder\MBR_1.JPG' is denied." The common reply to this problem is to dispose the image. I did, but I still get the message. If the code looks funny to you, that's because it is VB.NET.

What I have tried:

Imports System.IO
Imports System.Drawing.Imaging

    Sub test(ByVal szFolder As String)
        Dim aszFiles() As String = Directory.GetFiles(szFolder)
        For intFile As Integer = aszFiles.Length - 1 To 0 Step -1
            Dim szOriginalFile As String = aszFiles(intFile)
            ' Determine if this file is a .jpg or .avi file
            Dim szExtension As String = LCase(Path.GetExtension(szOriginalFile))
            Select Case szExtension
                Case ".jpg", ".jpeg"
                    Try
                        Dim szFilePath As String = Path.GetDirectoryName(szOriginalFile)
                        If szFilePath = "" Then szFilePath = Path.GetPathRoot(szOriginalFile) ' If root path is selected.

                        If Microsoft.VisualBasic.Right(szFilePath, 1) <> "\" Then szFilePath &= "\"
                        Dim szTempBakFile As String = Path.GetDirectoryName(szOriginalFile) & "\" & _
                            Path.GetFileNameWithoutExtension(szOriginalFile) & ".bak"

                        If Microsoft.VisualBasic.Right(szFilePath, 1) <> "\" Then szFilePath &= "\"
                        Dim szNewFile As String = Path.GetDirectoryName(szOriginalFile) & "\" & _
                            "File" & intFile.ToString & ".jpeg"

                        If szNewFile <> szOriginalFile Then
                            Dim Image1 As Bitmap = New Bitmap(szOriginalFile) ' If file has no bitmap, Try-Catch goes to Next File
                            Image1.Save(szTempBakFile, ImageFormat.Jpeg) ' save Image1 as "old name.bak"
                            Image1.Dispose() ' Unlock file
                            File.Move(szTempBakFile, szNewFile) ' Rename image with new name
                            File.Delete(szOriginalFile) ' Delete file
                        End If
                    Catch ex As Exception
                        MsgBox(ex.ToString)
                    End Try
            End Select
        Next
    End Sub

推荐答案

如果我从中提取代码，并通过预设文件名调整它以在我的系统上工作：

If I extract the code from that, and tweak it to work on my system by presetting the file names:

Dim szOriginalFile As String = "D:\Temp\MyPic.jpg"
Dim szTempBakFile As String = "D:\Temp\MyPicTemp.jpg"
Dim szNewFile As String = "D:\Temp\MyPicNew.jpg"
Dim Image1 As Bitmap = New Bitmap(szOriginalFile)
Image1.Save(szTempBakFile, ImageFormat.Jpeg)
Image1.Dispose()
File.Move(szTempBakFile, szNewFile)
File.Delete(szOriginalFile)

它工作正常：我最终得到一个输出新名称下的文件。

如果我在运行之间重新命名文件，它可以在不退出应用程序的情况下多次执行此操作。



所以事实并非如此导致问题的代码 - 它是一个真正的权限问题，或代码中的其他东西是锁定文件。



BTW：这是一个非常非常差的通过加载和编写JPG文件来重命名JPG文件的想法：每次保存JPG图像时，由于使用了有损压缩算法，因此会丢失细节。六次迭代，你会得到一个非常模糊的图像，与原始图像几乎没有相似之处。

It works fine: I end up with a single output file under the new name.
Provided I rename the file back between runs, it can do it as many times as a like without exiting the app.

So it isn't that code that is causing the problem - it's either a genuine permissions problem, or something else in your code is locking the file.

BTW: it's a very, very poor idea to rename JPG files by loading and writing them: each time you save a JPG image, you lose detail because it uses a lossy compression algorithm. Half a dozen iterations, and you will get a very fuzzy image that bears little resemblance to the original.

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