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。
在将批量图像
转换为单个pdf
时,我遇到了问题,它会将所有图像都转换,但在转换后,如果我检查它,它只显示最后一个图像,因为它没有附加到现有图像上,而是覆盖了先前的图像。
那么我该如何纠正这个问题?
如果我做错了什么,请帮忙指出,因为我第一次使用pdf库,并且我很乐意了解更多信息。即使您指出我犯的错误,我也不会感到不舒服。
以下是我的代码:
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