Java unhandled exception error

[Gary Beene]

Hi Jose!

If you insist in using code from the dark ages and ignore all the improvements

Personally, I prefer light bulbs over candles for illumination - so bring me on into the modern age!

If I didn't comment on your other post, it was because my search never turned up the post! Thanks for the link.

BTW, I just went looking for your newer post to see how I missed it. Searching for "Web Browser Example", your post wasn't included in the 20 page search results! I got the same result in a few other searches.

In the post you gave me the link to, you were logged in as a "Guest". I wonder if that was affected my search?

Unfortunately, nobody seems to read it and always copy the version of post #1

Going to try out the newer version right now!

[José Roca]

The first version is to be used with PB 7 only. The modified version can be used with 8+. With PB 9 and 10 it should be not used at all because much better options are available.

I wrote it to allow the mix of Automation and low-level COM. It was the only way at that time, but since PB 9 and 10 have native direct interface calls, to continue using these now archaic workarounds is like throwing all the work done in the last 8 years to improve the compilers by the board.

Anyway, it's not my business which code will be used by someone else, but I wanted to warn Gary that he was using the wrong version.

[Knuth Konrad]

Hi José,

Two years later, I posted a correct version for compiler 8+. See post #6 i this thread: http://www.powerbasic.com/support/pb...tlMakeDispatch

Unforunately, nobody seems to read it and always copy the version of post #1.

You wrote "I changed my password and I'm not longer allowed to edit my original post." in post #8.

A suggestion: PM the forum admin and ask him to replace the code in #1 with the one in #8 so that this doesn't happen anymore.

[José Roca]

Hi Gary,

If you insist in using code from the dark ages and ignore all the improvements made in the last eight years, be at least aware that the AtlMakeDispatch procedure, that I wrote in 2003, was intentionally wrong to workaround a bug in PB 7.0.

Two years later, I posted a correct version for compiler 8+. See post #6 i this thread: http://www.powerbasic.com/support/pb...tlMakeDispatch

Unforunately, nobody seems to read it and always copy the version of post #1.

To read the text, you need to geet a reference to the IHTMLDocument3 interface and then to the IHTMLElement interface (both in the MTHML component) and call the method innerText. Search for innetHTML in the forum to find some old code.

If you want to try a more modern approach, try this (don't click the "Get text" button until the page has been loaded):

#COMPILE EXE
#DIM ALL
%UNICODE = 1

' // Include files for external files
%USEWEBBROWSER = 1            ' // Use the WebBrowser control
#INCLUDE ONCE "CWindow.inc"   ' // CWindow class

' // Identifier
%IDC_WEBBROWSER = 101

' ########################################################################################
' Main
' ########################################################################################
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Set process DPI aware
'   SetProcessDPIAware

   ' // Create an instance of the class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   pWindow.CreateWindow(%NULL, "WebBrowser Template", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   ' // Set the client siz
   pWindow.SetClientSize 600, 400
   ' // Center the window
   pWindow.CenterWindow

   ' // Add a WebBrowser control
   LOCAL hCtl AS DWORD
   LOCAL bstrURL AS WSTRING
   bstrURL = "http://www.powerbasic.com/support/pbforums/"
   hCtl = pWindow.AddWebBrowserControl(pWindow.hwnd, %IDC_WEBBROWSER, bstrURL, NOTHING, 0, 0, pWindow.ClientWidth, pWindow.ClientHeight)

   ' // Add a button
   pWindow.AddButton(pWindow.hwnd, %IDOK, "Get text", 0, 0, 0, 0)

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ########################################################################################

' ========================================================================================
' Main callback function.
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL uMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   STATIC pWindow AS IWindow        ' // Reference to the IWindow interface

   SELECT CASE uMsg

      CASE %WM_CREATE
         ' // Get a reference to the IWindow interface from the CREATESTRUCT structure
         pWindow = CWindow_GetObjectFromCreateStruct(lParam)
         EXIT FUNCTION

      CASE %WM_SYSCOMMAND
         ' // Capture this message and send a WM_CLOSE message
         ' // Note: Needed with some OCXs, that otherwise remain in memory
         IF (wParam AND &HFFF0) = %SC_CLOSE THEN
            SendMessage hwnd, %WM_CLOSE, 0, 0
            EXIT FUNCTION
         END IF

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)
            CASE %IDCANCEL
               ' // If the Escape key has been pressed...
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  ' // ... close the application by sending a WM_CLOSE message
                  SendMessage hwnd, %WM_CLOSE, 0, 0
                  EXIT FUNCTION
               END IF

            CASE %IDOK  ' // Get the text
               LOCAL pWB AS IWebBrowser2
               pWB = OC_GetDispatch(GetDlgItem(hwnd, %IDC_WEBBROWSER))
               IF ISOBJECT(pWB) THEN
                  LOCAL pDoc AS IHTMLDocument3
                  pDoc = pWB.Document
                  IF ISOBJECT(pDoc) THEN
                     LOCAL pElement AS IHTMLElement
                     pElement = pDoc.documentElement
                     ? pElement.innerText
                  END IF
               END IF

         END SELECT

      CASE %WM_SIZE
         IF wParam <> %SIZE_MINIMIZED THEN
            ' // Resize the control
            pWindow.MoveWindow GetDlgItem(hwnd, %IDC_WEBBROWSER), 0, 0, pWindow.ClientWidth, pWindow.ClientHeight - 50, %TRUE
            pWindow.MoveWindow GetDlgItem(hwnd, %IDOK), pWindow.ClientWidth - 100, pWindow.ClientHeight - 35, 70, 23, %TRUE
         END IF

      CASE %WM_DESTROY
         ' // End the application
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   ' // Pass unprocessed messages to Windows
   FUNCTION = DefWindowProc(hwnd, uMsg, wParam, lParam)

END FUNCTION
' ========================================================================================

BTW you can find several WebBrowser examples in my forum.

[Gary Beene]

Looking at the code in post #2 again bring to mind the question of where I can find the exposed methods of the control.

It would be too simple if it was like this:

oOCX.selectall
oOCX.copy

Now I'm getting an even better reason to work with objects. I'm guessing my PB COM browser will rescue me here? I'll go look!

[Gary Beene]

A browser in my app is way cool. I don't know why I haven't done more with it so far, but I will ... but to my question ...

With a URL displayed, as with the code from Jose up in post#2, can I capture all the displayed text? That would be most useful in one of my apps.

I don't know enough about the technique to know if there's a simple method or two that will do the trick. I don't care about maintaining formatting.

I could download the *.htm file and try to parse out the HTML stuff, but it would seem like that smart thing to do to let the browser control do it for me, and just work with the results.

I'll go look into it, but I thought someone more familiar with the code might have a ready-at-hand solution!

... added ... if there are no built-in methods to the browser control, then programmatically sending Ctrl-A and then Ctrl-C to the browser control would be just fine too. Heck, I might even be able to figure out that one!

[Paul Franks]

Originally posted by Mike Doty:

java/lang/NoSuchMethodError was not handled.
Would you like to debug the application?

Wouldn't worry too much about Java Applets not working - it's pretty
much a dead technology, for a couple of reasons: 1. Flash players are
installed in something like 97% of desktop browsers, vs. a far smaller
percentage with the JRE installed. 2. The JRE still takes forever
to load and start an applet running, while Flash applets start up
almost instantly. 99.999% of those irritating animated ads on the
web are using your Flash player.

Now, if you're talking cell phones or app servers, Java is pervasive, just
not on the desktop.


------------------

--pdf

[Mike Doty]

'great. i need to leave (really great code.)
'project for the week! a web browser with printing/preview and within ddt!
'looks like some of you already have it! ''
'
'definitely start another thread (if you would.)'
'i've got the code combined, but not working yet.
'
'mike

'found this one that already prints, but doesn't take a url as is. http://www.powerbasic.com/support/pb...ad.php?t=24065




[this message has been edited by mike doty (edited june 24, 2007).]

[Brad D Byrne]

hehe, yeah Mike, I knew this all looked pretty familar,

most of that code is on an old machine, I'll try to dig it out tonight
after I get some pressing work done, I'm glad you re-opened this topic
it's actually good timing for me, I was into a web interface I wasn't
sure how to handle!

------------------
Washington DC Area
Borje's "Poff's" is likely the BEST tool for learning PB.. http://www.reonis.com/POFFS/index.htm
And a few PBTool's & Beginner Help:http://sweetheartgames.com/PBTools/JumpStart.html
& Another Good Resource: http://www.fredshack.com/docs/powerbasic.html

[Mike Doty]

here is how to print: http://www.powerbasic.com/support/pb...ad.php?t=24237

'now need to piece them together

------------------

[Mike Doty]

brad,
if this is you, looks like you have been this route for printing. http://www.powerbasic.com/support/pb...ad.php?t=24222

------------------

[Mike Doty]

There was a recent Java update recently which I was required to
install. The animation does play within IE7 browser.
I'm updating Java on an older Windows 98 SE machine, now.
There is a option to verify now to see the current Java version.

Followed update instruction and found no option in browser for
Java2 within Windows 98 SE. Looked in XP with IE7 and find
no option for Java2 there, either.

------------------


[This message has been edited by Mike Doty (edited June 24, 2007).]

[Brad D Byrne]

hmmm, I take that back, the code must still be using my IE7 that I have
installed, because if I simply open http://java.com/en/dukeszone/ in the Firefox browser itself the animation doesn't play

------------------
Washington DC Area
Borje's "Poff's" is likely the BEST tool for learning PB.. http://www.reonis.com/POFFS/index.htm
And a few PBTool's & Beginner Help:http://sweetheartgames.com/PBTools/JumpStart.html
& Another Good Resource: http://www.fredshack.com/docs/powerbasic.html

[Mike Doty]

Thanks, Brad. Duke said "Hi", then.
It works with the IE7 browswer here, but not the PB code.
Again, trivial compared to getting printing capability.


------------------

[Brad D Byrne]

Mike the animations work here,

I have default browser

Firefox/1.5.0.12

XP pro, 2002, service pak 2

------------------
Washington DC Area
Borje's "Poff's" is likely the BEST tool for learning PB.. http://www.reonis.com/POFFS/index.htm
And a few PBTool's & Beginner Help:http://sweetheartgames.com/PBTools/JumpStart.html
& Another Good Resource: http://www.fredshack.com/docs/powerbasic.html

[Mike Doty]

I'm adding new items to wish list, now.
Hope others see this code.

'To do list:
'1 Print button
'    With printing all internet and local documents right here
'    with the benefit of images within html documents!
'
'2 Refresh button
'3 Stop button
'
'Down the road:
'4 Get to work in PbForms
'5 Add html editing
'6 Add upload capability
'With the above you could download/upload and display on-the-fly to anyone in the world!

------------------




[This message has been edited by Mike Doty (edited June 24, 2007).]

[Brad D Byrne]

TOOOO COOOOOL!!!

I Love IT!! I am posting this thru the program!

I'll check the Java site,

Thanks! Mike & Jose

------------------
Washington DC Area
Borje's "Poff's" is likely the BEST tool for learning PB.. http://www.reonis.com/POFFS/index.htm
And a few PBTool's & Beginner Help:http://sweetheartgames.com/PBTools/JumpStart.html
& Another Good Resource: http://www.fredshack.com/docs/powerbasic.html

[Mike Doty]

'Heck, it isn't that much code and it is a must see!
'

'To do list:
'1 Print button
'    With printing all internet and local documents right here
'    with the benefit of images within html documents!
'
'2 Refresh button
'3 Stop button
'
'4 Get to work in PbForms
'5 Add html editing (a whole new subject)
'6 Add upload capability
'With the above you could download/upload and display on-the-fly!

'
'Help system could also be written using html and used with this.
'Internet documents and local documents available easily.
'
'
'Is ATL.DLL present in all versions of Windows? Works with Windows 98, too.

'A browser within DDT, wow!
'
'***********************************************************
'This is the most valuable code I've seen in a long time.
'***********************************************************
'Code by Jose Roca (of course.)

'
'
'New version of the first example. I have made the dialog modeless to
'be able to pass the keystrokes to the WebBrowser control for processing,
'otherwise the main dialog will eat them and shortcuts like Ctrl-C
'won't work.

  #DIM ALL
  #INCLUDE "win32api.inc"

  %WM_FORWARDMSG = &H37F ' (895)

  %ID_OCX     = 1001
  %IDC_URL    = 1010
  %IDC_BTNAVG = 1011
  %IDC_BTBACK = 1012
  %IDC_BTFRWD = 1013
  %IDC_LABEL1 = 1014

  GLOBAL hDlg AS DWORD
  GLOBAL hOcx AS DWORD
  GLOBAL oOcx AS DISPATCH


  DECLARE FUNCTION AtlAxWinInit LIB "ATL.DLL" ALIAS "AtlAxWinInit" () AS LONG
' *********************************************************************************************
  DECLARE FUNCTION AtlAxWinTerm () AS LONG
' *********************************************************************************************
  FUNCTION AtlAxWinTerm () AS LONG
    UnregisterClass ("AtlAxWin", GetModuleHandle(BYVAL %NULL))
  END FUNCTION
' *********************************************************************************************
' **********************************************************************************************
  DECLARE FUNCTION AtlAxGetControl LIB "ATL.DLL" ALIAS "AtlAxGetControl" _
     ( _
     BYVAL hWnd AS DWORD, _   ' [in] A handle to the window that is hosting the control.
     BYREF pp AS DWORD _      ' [out] The IUnknown of the control being hosted.
  ) AS DWORD
' *********************************************************************************************

' *********************************************************************************************
' Puts the address of an object in a variant and marks it as containing a dispatch variable
' *********************************************************************************************
  SUB AtlMakeDispatch ( _
     BYVAL lpObj AS DWORD, _                        ' Address of the object instance
     BYREF vObj AS VARIANT _                        ' Variant to contain this address
     ) EXPORT

     LOCAL lpvObj AS VARIANTAPI PTR                 ' Pointer to a VARIANTAPI structure
     LET vObj = EMPTY                               ' Make sure is empty to avoid memory leaks
     lpvObj = VARPTR(vObj)                          ' Get the VARIANT address
     @lpvObj.vt = %VT_DISPATCH                      ' Mark it as containing a dispatch variable
     @lpvObj.vd.pdispVal = lpObj                    ' Set the dispatch pointer address

  END SUB
' *********************************************************************************************

' *********************************************************************************************
' Main dialog callback
' *********************************************************************************************
  CALLBACK FUNCTION MainDlgProc()

     LOCAL rc AS RECT
     LOCAL r AS LONG
     LOCAL x AS LONG
     LOCAL y AS LONG
     LOCAL xx AS LONG
     LOCAL yy AS LONG


     SELECT CASE CBMSG

        CASE %WM_SIZE
           GetClientRect CBHNDL, rc
           x = rc.nLeft
           y = rc.nTop
           xx = rc.nRight - rc.nLeft
           yy = rc.nBottom - rc.nTop - 32
           MoveWindow hOcx, x, y, xx, yy, %TRUE

        CASE %WM_DESTROY
           PostQuitMessage 0

        CASE %WM_COMMAND
           SELECT CASE CBCTL
              CASE %IDCANCEL
                 IF CBCTLMSG = %BN_CLICKED OR CBCTLMSG = 1 THEN
                    DIALOG END CBHNDL, 0
                 END IF
              CASE %IDC_BTNAVG
                 IF CBCTLMSG = %BN_CLICKED OR CBCTLMSG = 1 THEN
                    LOCAL strUrl AS STRING, vVar AS VARIANT
                    CONTROL GET TEXT CBHNDL, %IDC_URL TO strUrl
                    vVar = strUrl
                    OBJECT CALL oOcx.Navigate(vVar)
                 END IF
              CASE %IDC_BTBACK
                 IF CBCTLMSG = %BN_CLICKED OR CBCTLMSG = 1 THEN
                    OBJECT CALL oOcx.GoBack
                 END IF
              CASE %IDC_BTFRWD
                 IF CBCTLMSG = %BN_CLICKED OR CBCTLMSG = 1 THEN
                    OBJECT CALL oOcx.GoForward
                 END IF
           END SELECT

     END SELECT

  END FUNCTION
' *********************************************************************************************

' *********************************************************************************************
' Main
' *********************************************************************************************
  FUNCTION PBMAIN

     LOCAL hInst AS DWORD
     LOCAL hr AS DWORD
     LOCAL OcxName AS ASCIIZ * 255
     LOCAL pUnk AS DWORD
     LOCAL vVar AS VARIANT
     LOCAL uMsg AS tagMsg
     LOCAL dwCookie AS DWORD

     OcxName = "Shell.Explorer"

     AtlAxWinInit   ' // Initializes ATL

     DIALOG NEW 0, "A Web Browser in a DDT dialog",,, 528, 334, %WS_OVERLAPPEDWINDOW, 0 TO hDlg
     CONTROL ADD "AtlAxWin", hDlg, %ID_OCX, OcxName, 0, 0, 0, 0, %WS_VISIBLE OR %WS_CHILD
     CONTROL HANDLE hDlg, %ID_OCX TO hOcx
     CONTROL ADD LABEL, hDlg, %IDC_LABEL1, "URL", 226, 322, 16, 12
     CONTROL ADD TEXTBOX, hDlg, %IDC_URL, "", 250, 320, 210, 14
     CONTROL ADD BUTTON, hDlg, %IDC_BTNAVG, "&Navigate", 470, 320, 46, 14, %WS_TABSTOP OR %BS_DEFAULT
     CONTROL ADD BUTTON, hDlg, %IDC_BTBACK, "&Back", 5, 320, 46, 14, %WS_TABSTOP
     CONTROL ADD BUTTON, hDlg, %IDC_BTFRWD, "&Forward", 58, 320, 46, 14, %WS_TABSTOP
     CONTROL SET TEXT hDlg, %IDC_URL, "http://www.java.com"

     AtlAxGetControl(hOcx, pUnk)
     AtlMakeDispatch(pUnk, vVar)
     SET oOcx = vVar

     SetFocus(hOcx)
     DIALOG SHOW MODELESS hDlg, CALL MainDlgProc TO hr

     WHILE GetMessage(uMsg, %NULL, 0, 0)
        '// Pass keyboard messages to the ancestor
        '// Returns 0 if the message was not processed, nonzero if it was
        IF SendMessage(hOcx, %WM_FORWARDMSG, 0, VARPTR(uMsg)) = 0 THEN
           IF IsDialogMessage(hDlg, uMsg) = %FALSE THEN
              TranslateMessage uMsg
              DispatchMessage uMsg
           END IF
        END IF
     WEND

     AtlAxWinTerm   ' // Uninitializes ATL
     SET oOcx = NOTHING

  END FUNCTION
' *********************************************************************************************

------------------




[This message has been edited by Mike Doty (edited June 24, 2007).]

[Mike Doty]

'***********************************************
'The code below is a MUST see
'Forget about the java error and see the code!
'***********************************************


java/lang/NoSuchMethodError was not handled.
Would you like to debug the application?

Tried calling browser using VB6 and get same error.


The error occurs by visiting http://www.java.com
Click on Dukes Zone
Error occurs when Duke's little animation window attempts to animate.


The error doe not occur using IE7.

Just tested using Windows 98SE and it works.
Animation doesn't display, but no java exception error to debug.

The error doe not occur using IE6.

This error is trivial compared to adding printing support.




[This message has been edited by Mike Doty (edited June 24, 2007).]