我想知道是否有人知道让 .pdf 文件在加载时触发就绪状态的简单方法。我正在构建一个程序来打开 url 并截取屏幕截图，然后将它们放入 excel 中。
While Not pagereadyWeb 浏览器会正确加载 html 文档，但在加载.pdf文件时会卡住。浏览器控件正确呈现.pdf.
Private Sub btngo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btngo.Click
Dim file As String
Dim Obj As New Object
Dim result As String
Dim sheet As String = "sheet1"
Dim xlApp As New Excel.Application
If lblpath.Text <> "" Then
file = lblpath.Text
Dim xlWorkBook = xlApp.Workbooks.Open(file)
Dim xlWorkSheet = xlWorkBook.Worksheets(sheet)
Dim range = xlWorkSheet.UsedRange
ProgressBar1.Value = 0
For rCnt = 4 To range.Rows.Count
'url cell
Obj = CType(range.Cells(rCnt, 2), Excel.Range)
' Obj.value now contains the value in the cell..
Try
' Creates an HttpWebRequest with the specified URL.
Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(Obj.value), HttpWebRequest)
' Sends the request and waits for a response.
Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
If myHttpWebResponse.StatusCode = HttpStatusCode.OK Then
result = myHttpWebResponse.StatusCode
WebBrowser1.ScrollBarsEnabled = False
WebBrowser1.Navigate(myHttpWebRequest.RequestUri)
WaitForPageLoad()
CaptureWebBrowser(WebBrowser1)
End If
' Release the resources of the response.
myHttpWebResponse.Close()
Catch ex As WebException
result = (ex.Message)
Catch ex As Exception
result = (ex.Message)
End Try
RichTextBox1.AppendText(result & " " & Obj.value & vbNewLine)
If radpre.Checked = True Then
range.Cells(rCnt, 3).value = result
ElseIf radcob.Checked = True Then
range.Cells(rCnt, 4).value = result
ElseIf radpost.Checked = True Then
range.Cells(rCnt, 5).value = result
End If
ProgressBar1.Value = rCnt / range.Rows.Count * 100
Next
With xlApp
.DisplayAlerts = False
xlWorkBook.SaveAs(lblpath.Text.ToString)
.DisplayAlerts = True
End With
xlWorkBook.Close()
xlApp.Quit()
'reclaim memory
Marshal.ReleaseComObject(xlApp)
xlApp = Nothing
End If
End Sub
Private Function CaptureWebBrowser(ByVal wb As WebBrowser) As Image
Try
Dim hBitmap As Bitmap = New Bitmap(wb.Width, wb.Height)
wb.DrawToBitmap(hBitmap, wb.Bounds)
Dim img As Image = hBitmap
Return img
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
Return Nothing
End Function
Private Sub WaitForPageLoad()
AddHandler WebBrowser1.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf PageWaiter)
While Not pageready
Application.DoEvents()
End While
pageready = False
End Sub
Private Sub PageWaiter(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs)
If WebBrowser1.ReadyState = WebBrowserReadyState.Complete Then
pageready = True
RemoveHandler WebBrowser1.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf PageWaiter)
End If
End Sub
更新到已解决
我对反馈感到非常满意。我真的很喜欢Noseratio提供的答案。我不知道使用代码模式不是最佳实践。打开 .pdf 或任何其他非基于 Web 的文档readyState时，将永远不会从 .pdf 更改0。看到这个程序只是我不工作的一种方式，我对只捕获.html和.htm.
我的要求是
- 打开excel文档
- 解析位于 excel 文档中的链接
- 确定响应代码
- 编写响应代码，如果可能的话，截图到 excel
该程序解析和检索反馈的速度比我手动完成的要快得多。成功从生产环境迁移到 COB 并返回生产环境的 excel 文件证明的屏幕截图.html并.htm提供非技术查看者。
Noseratio所述的代码不遵循最佳实践，也不是高质量的。这是一个快速而肮脏的实现。
Option Infer On
Imports Microsoft.Office.Interop
Imports System.Net
Imports System.Runtime.InteropServices
Public Class Form1
Public Property pageready As Boolean
Private Sub OpenToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenToolStripMenuItem.Click
OpenFileDialog1.ShowDialog()
End Sub
Private Sub OpenFileDialog1_FileOk(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles OpenFileDialog1.FileOk
lblpath.Text = OpenFileDialog1.FileName.ToString
End Sub
Private Sub btngo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btngo.Click
Dim file As String
Dim Obj As New Object
Dim result As String
Dim sheet As String = "sheet1"
Dim xlApp As New Excel.Application
Dim img As Bitmap
Dim path As String = "C:\Documents and Settings\user\My Documents\Visual Studio 2010\Projects\COB-HTML-Tool\COB-HTML-Tool\bin\Debug\tmp.bmp"
If lblpath.Text <> "" Then
file = lblpath.Text
Dim xlWorkBook = xlApp.Workbooks.Open(file)
Dim xlWorkSheet = xlWorkBook.Worksheets(sheet)
Dim range = xlWorkSheet.UsedRange
ProgressBar1.Value = 0
For rCnt = 4 To range.Rows.Count
'url cell
Obj = CType(range.Cells(rCnt, 2), Excel.Range)
' Obj.value now contains the value in the cell..
Try
' Creates an HttpWebRequest with the specified URL.
Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(Obj.value), HttpWebRequest)
' Sends the request and waits for a response.
Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
If myHttpWebResponse.StatusCode = HttpStatusCode.OK Then
result = myHttpWebResponse.StatusCode
Dim len As Integer = myHttpWebRequest.RequestUri.ToString.Length - 4
If myHttpWebRequest.RequestUri.ToString.Substring(len) = ".htm" Or
myHttpWebRequest.RequestUri.ToString.Substring(len - 1) = ".html" Or
myHttpWebRequest.RequestUri.ToString.Substring(len) = ".asp" Then
WebBrowser1.Navigate(myHttpWebRequest.RequestUri)
WaitForPageLoad()
img = CaptureWebBrowser(WebBrowser1)
img.Save(path)
End If
End If
' Release the resources of the response.
myHttpWebResponse.Close()
Catch ex As WebException
result = (ex.Message)
Catch ex As Exception
result = (ex.Message)
End Try
RichTextBox1.AppendText(result & " " & Obj.value & vbNewLine)
If radpre.Checked = True Then
range.Cells(rCnt, 3).value = result
If img Is Nothing Then
Else
If Dir(path) <> "" Then
range.Cells(rCnt, 4).Select()
Dim opicture As Object
opicture = xlApp.ActiveSheet.Pictures.Insert(path)
opicture.ShapeRange.LockAspectRatio = True
opicture.ShapeRange.width = 170
opicture.ShapeRange.height = 170
My.Computer.FileSystem.DeleteFile(path)
End If
End If
ElseIf radcob.Checked = True Then
range.Cells(rCnt, 5).value = result
If img Is Nothing Then
Else
If Dir(path) <> "" Then
range.Cells(rCnt, 6).Select()
Dim opicture As Object
opicture = xlApp.ActiveSheet.Pictures.Insert(path)
opicture.ShapeRange.LockAspectRatio = True
opicture.ShapeRange.width = 170
opicture.ShapeRange.height = 170
My.Computer.FileSystem.DeleteFile(path)
End If
End If
ElseIf radpost.Checked = True Then
range.Cells(rCnt, 7).value = result
If img Is Nothing Then
Else
If Dir(path) <> "" Then
range.Cells(rCnt, 8).Select()
Dim opicture As Object
opicture = xlApp.ActiveSheet.Pictures.Insert(path)
opicture.ShapeRange.LockAspectRatio = True
opicture.ShapeRange.width = 170
opicture.ShapeRange.height = 170
My.Computer.FileSystem.DeleteFile(path)
End If
End If
End If
ProgressBar1.Value = rCnt / range.Rows.Count * 100
Next
With xlApp
.DisplayAlerts = False
xlWorkBook.SaveAs(lblpath.Text.ToString)
.DisplayAlerts = True
End With
xlWorkBook.Close()
xlApp.Quit()
'reclaim memory
Marshal.ReleaseComObject(xlApp)
xlApp = Nothing
End If
End Sub
Private Function CaptureWebBrowser(ByVal wb As WebBrowser) As Image
Try
wb.ScrollBarsEnabled = False
Dim hBitmap As Bitmap = New Bitmap(wb.Width, wb.Height)
wb.DrawToBitmap(hBitmap, wb.Bounds)
Dim img As Image = hBitmap
Return img
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
Return Nothing
End Function
Private Sub WaitForPageLoad()
AddHandler WebBrowser1.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf PageWaiter)
While Not pageready
Application.DoEvents()
System.Threading.Thread.Sleep(200)
End While
pageready = False
End Sub
Private Sub PageWaiter(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs)
If WebBrowser1.ReadyState = WebBrowserReadyState.Complete Then
pageready = True
RemoveHandler WebBrowser1.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf PageWaiter)
End If
End Sub
End Class