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我正在尝试使用pdfsharp 库将多个图像转换为 pdf 。

我能够转换单个图像并且效果很好。

在转换为时bulk images我single pdf面临的问题是它需要所有图像并转换它们但在转换之后如果我检查它只显示最后一个图像，因为它没有附加到现有图像并且它会覆盖以前的图像。

那么我该如何纠正呢？

任何帮助都将不胜感激，因为我是第一次使用 pdf 库并指出我是否犯了任何错误。我很乐意了解更多关于此的信息，但我不觉得如果你指出我的错误我完成了。

这是我的代码：

 Private Sub btnAddFolder_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddFolder.Click
            If Me.FolderBrowserDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then

            Dim f As New DirectoryInfo(Me.FolderBrowserDialog1.SelectedPath)
            Dim fso As New System.Object
            For Each file As FileInfo In f.GetFiles
                Select Case file.Extension.ToLower
                    Case ".jpg", ".bmp", ".gif", ".png"
                        Me.ThumbControl1.BackgroundImage = Nothing
                        Me.CheckedListBox1.Items.Add(file.FullName, CheckState.Checked)
                        Me.ThumbControl1.AddThumbnail(file.FullName)
                        Me.ThumbControl1.BackgroundImage = Nothing
                        Me.CheckedListBox1.SelectedIndex = 0
                End Select
            Next
            End If
    End Sub

后台工作者：

 Private Sub bw_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs) Handles bw.DoWork
        For pix As Integer = 0 To CheckedListBox1.CheckedItems.Count - 1
            Try
                Dim source As String = CheckedListBox1.Items(pix).ToString()
                Dim destinaton As String = (TryCast(e.Argument, String()))(1)

                Dim doc As New PdfDocument()
                doc.Pages.Add(New PdfPage())
                Dim xgr As XGraphics = XGraphics.FromPdfPage(doc.Pages(0))
                Dim img As XImage = XImage.FromFile(source)

                xgr.DrawImage(img, 0, 0)
                doc.Save(destinaton)
                doc.Close()
                success = True
            Catch ex As Exception
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try
        Next
    End Sub

转换按钮：

  Private Sub btnConvert_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnConvert.Click
         bw.RunWorkerAsync(New String(1) {srcFile, destFile})
  End sub

保存PDF：

Private Sub btnSelectDest_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSelectDest.Click
        sfdDestFile.Filter = "PDF Files(*.pdf)|*.pdf"
        If sfdDestFile.ShowDialog() <> System.Windows.Forms.DialogResult.OK Then
            Return
        End If
        destFile = sfdDestFile.FileName
 End Sub
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1 回答 1

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问题是您在每次通过循环时都创建一个新的 PDF 文档。您需要将其移到循环之外。此外，您引用的是 page 0，而不是 page pix。这是我将如何解决它：

Private Sub bw_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs) Handles bw.DoWork
    Dim doc As New PdfDocument()

    For pix As Integer = 0 To CheckedListBox1.CheckedItems.Count - 1
        Try
            Dim source As String = CheckedListBox1.Items(pix).ToString()
            Dim oPage As New PDFPage()

            doc.Pages.Add(oPage)
            Dim xgr As XGraphics = XGraphics.FromPdfPage(oPage)
            Dim img As XImage = XImage.FromFile(source)

            xgr.DrawImage(img, 0, 0)
            success = True
        Catch ex As Exception
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try
    Next

    Dim destinaton As String = (TryCast(e.Argument, String()))(1)
    doc.Save(destinaton)
    doc.Close()
End Sub
于 2011-12-12T22:08:09.913 回答