Webbrowser, Convert HTML to image
in [Visual Basic]
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From: Sneha Menon on 20 Sep 2009 12:18 Dear all, I am working on a vb6 project where I am using webbrowser. Once the url is loaded in the wb I want to take a snapshot of the webpage and get it into a picturebox and use it for other purposes. Googled. Came accross the phrase Convert HTML to Image, but could not reach any useful material. (Found one in dotnet, html/webbrowser drawtoBitmap I think). Is there any way to do that in VB6? Any ActiveX Ideas? API stuff?. Please note:print screen type of screenshots wont serve the purpose. Even in case other components or forms are partially covering the wb, the snapshot should be complete. Any Ideas, suggestions? Regards. Sneha
From: Eduardo on 20 Sep 2009 14:03 Sneha Menon escribi�: > Dear all, > > I am working on a vb6 project where I am using webbrowser. Once the > url is loaded in the wb I want to take a snapshot of the webpage and > get it into a picturebox and use it for other purposes. Googled. Came > accross the phrase Convert HTML to Image, but could not reach any > useful material. (Found one in dotnet, html/webbrowser drawtoBitmap I > think). Is there any way to do that in VB6? Any ActiveX Ideas? API > stuff?. Please note:print screen type of screenshots wont serve the > purpose. Even in case other components or forms are partially covering > the wb, the snapshot should be complete. > > Any Ideas, suggestions? With help from: http://www.vbforums.com/showthread.php?t=468596 ' Add this code to a module: ' *********** Begin Module ********* Option Explicit Public Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As _ Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As _ Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal _ xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long Public Declare Function GetDC Lib "user32" _ (ByVal hWnd As Long) As Long Private Declare Function GetClassName Lib "user32.dll" Alias _ "GetClassNameA" (ByVal hWnd As Long, ByVal lpClassName _ As String, ByVal nMaxCount As Long) As Long Private Declare Function EnumChildWindows Lib "user32.dll" ( _ ByVal hWndParent As Long, _ ByVal lpEnumFunc As Long, _ ByVal lParam As Long _ ) As Long Private hWndIE As Long Private Function EnumChildProc(ByVal hWnd As Long, ByVal lParam As _ Long) As Long Dim sClassName As String sClassName = String(255, vbNullChar) Call GetClassName(hWnd, sClassName, 255) sClassName = Left$(sClassName, InStr(sClassName, vbNullChar) - 1) If sClassName <> "Internet Explorer_Server" Then EnumChildProc = 1 Else hWndIE = hWnd End If End Function Public Function GetBrowserHandle(ByVal hWndParent) As Long hWndIE = 0 Call EnumChildWindows(hWndParent, AddressOf EnumChildProc, 1) GetBrowserHandle = hWndIE End Function ' *********** End Module ********* ' Add a WebBrowser and a PictureBox to the Form ' and copy this code into the form's code module: ' *********** Begin Form ********* Private Sub CopyWebBrowserImageToPicture() Dim iHwnd As Long Dim iDC As Long iHwnd = GetBrowserHandle(Me.hWnd) iDC = GetDC(iHwnd) Picture1.Width = WebBrowser1.Width Picture1.Height = WebBrowser1.Height Picture1.ScaleMode = vbPixels BitBlt Picture1.hDC, 0, 0, Picture1.ScaleWidth, _ Picture1.ScaleHeight, iDC, 0, 0, vbSrcCopy Set Picture1.Picture = Picture1.Image End Sub Private Sub Form_Load() WebBrowser1.Navigate "http://www.yahoo.com" Picture1.AutoRedraw = True End Sub Private Sub WebBrowser1_DocumentComplete(ByVal pDisp _ As Object, URL As Variant) CopyWebBrowserImageToPicture End Sub ' *********** End Form *********
From: Larry Serflaten on 20 Sep 2009 14:18 "Eduardo" <mm(a)mm.com> wrote i > > Is there any way to do that in VB6? Any ActiveX Ideas? API > > stuff?. Please note:print screen type of screenshots wont serve the > > purpose. Even in case other components or forms are partially covering > > the wb, the snapshot should be complete. > With help from: > http://www.vbforums.com/showthread.php?t=468596 Did you try it? Unfortunately, it is no better than a screen snapshot. The entire page has to be in view, or else it does not get copied... LFS
From: Eduardo on 20 Sep 2009 15:17 Larry Serflaten escribi�: >>> Is there any way to do that in VB6? Any ActiveX Ideas? API >>> stuff?. Please note:print screen type of screenshots wont serve the >>> purpose. Even in case other components or forms are partially covering >>> the wb, the snapshot should be complete. > Did you try it? Unfortunately, it is no better than a screen snapshot. > The entire page has to be in view, or else it does not get copied... Emmm, sorry, I didn't pay much attention to the whole text of the post. That code won't help actually, ignore it.
From: Mike Williams on 20 Sep 2009 16:41
"Eduardo" <mm(a)mm.com> wrote in message news:h95v3n$age$1(a)aioe.org... > Emmm, sorry, I didn't pay much attention to the whole > text of the post. That code won't help actually, ignore it. The following seems to work okay, although I haven't tested it fully and I always have timing trouble when using any of the WebBrowser Control events so the code to create the bitmap is in the click event of a button, which should be clicked after the web page has visibly loaded. It obviously needs a bit more work to solve the timing problem, but I can't seem to hit the correct delay or find the right event that suits all web pages. Paste the following into a Form containing a WebBrowser Control and a Picture Box and a Command Button: Mike Option Explicit Private Declare Function SendMessage Lib "user32" Alias _ "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _ ByVal wParam As Long, ByVal lParam As Long) As Long Private Declare Function GetWindow Lib "user32" _ (ByVal hwnd As Long, ByVal wCmd As Long) As Long Private Declare Function GetClassName Lib "user32" _ Alias "GetClassNameA" (ByVal hwnd As Long, _ ByVal lpClassName As String, ByVal nMaxCount As Long) _ As Long Private Const WM_PAINT = &HF Private Const WM_PRINT = &H317 Private Const PRF_CHILDREN = &H10& Private Const PRF_CLIENT = &H4& Private Const PRF_OWNED = &H20& Private Const GW_CHILD = 5 Private Const GW_HWNDNEXT = 2 Private Sub Form_Load() Picture1.BorderStyle = vbBSNone Picture1.AutoRedraw = True Me.ScaleMode = vbTwips WebBrowser1.Width = Screen.Width WebBrowser1.Height = Screen.Height * 2 Picture1.Width = WebBrowser1.Width Picture1.Height = WebBrowser1.Height Picture1.Left = -Picture1.Width ' move off display Picture1.Cls Picture1.BorderStyle = vbBSNone Picture1.AutoRedraw = True WebBrowser1.Navigate "http://www.yahoo.co.uk" Caption = "Click Button after web page has loaded . . ." End Sub Private Sub Command1_Click() Dim myWindow As Long, childWindow As Long Dim myClass As String, clsName As String * 256 Dim s1 As String myClass = "Shell Embedding" childWindow = GetWindow(Me.hwnd, GW_CHILD) Do GetClassName childWindow, clsName, 256 If Left$(clsName, Len(myClass)) = myClass Then myWindow = childWindow Exit Do End If childWindow = GetWindow(childWindow, GW_HWNDNEXT) Loop While childWindow <> 0 If myWindow <> 0 Then SendMessage myWindow, WM_PAINT, Picture1.hDC, 0 SendMessage myWindow, WM_PRINT, Picture1.hDC, _ PRF_CHILDREN + PRF_CLIENT + PRF_OWNED Picture1.Picture = Picture1.Image s1 = "c:\temp\webpic1.bmp" ' or whatever is required SavePicture Picture1.Picture, s1 Caption = "Web page saved as " & s1 End If End Sub |