{"id":2600,"date":"2022-08-30T15:26:13","date_gmt":"2022-08-30T15:26:13","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2014\/02\/04\/how-to-cleanly-destroy-webbrowser-control-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:26:13","modified_gmt":"2022-08-30T15:26:13","slug":"how-to-cleanly-destroy-webbrowser-control-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/how-to-cleanly-destroy-webbrowser-control-collection-of-common-programming-errors\/","title":{"rendered":"How to Cleanly Destroy WebBrowser Control-Collection of common programming errors"},"content":{"rendered":"

I am using ATL in VisualC++10 to host browser control. My code is similar to this example: http:\/\/msdn.microsoft.com\/en-us\/library\/9d0714y1(v=vs.80).aspx<\/p>\n

Difference is I have main window and then child window hosts the browser control. After 2 minutes i have to close the browser completely kill the browser activeX but this child window should be alive and do something else. But somehow this browser control still stays there, i can either see scrollbars or something..<\/p>\n

I have also tried by creating child window to an existing child window, and at the time of closing browser I then destroy this child of a child – but still it does not work!<\/p>\n

This is how I am closing:<\/p>\n

CLOSE()\n{\n    m_spIWebBrowser2->Navigate(bstrURL, &vEmpty, &vEmpty, &vEmpty, &vEmpty);\n    m_spIWebBrowser2->Stop();\n    m_spIWebBrowser2->put_Visible(VARIANT_FALSE);\n    m_spIWebBrowser2->Quit();\n    DestroyWindow(m_wndChild.m_hWnd);\n}\n<\/code><\/pre>\n
Thanks!<\/p>\n
    \n
  1. \n
    I had many problems with “access violation” when closing webbrowser control, these are the steps that worked for me:<\/p>\n
      \n
    1. Unadvise any previously advised events (DWebBrowserEvents2 in my case).<\/li>\n
    2. If you’ve attached click events unattach them like this: _variant_t v; v.vt = VT_DISPATCH; v.pdispVal = 0; IHTMLDocument2->put_onclick(v);<\/code><\/li>\n
    3. IWebBrowser2->Stop()<\/code><\/li>\n
    4. IWebBrowser2->ExecWB(OLECMDID_CLOSE, OLECMDEXECOPT_DONTPROMPTUSER, 0, 0)<\/code> – when closing browser window through window.external.CloseWindow() I had unhandled exceptions and OLECMDID_CLOSE fixed it.<\/li>\n
    5. IWebBrowser2->put_Visible(VARIANT_FALSE)<\/code><\/li>\n
    6. IWebBrowser2->Release()<\/code><\/li>\n
    7. IOleInPlaceObject->InPlaceDeactivate()<\/code><\/li>\n
    8. IOleInPlaceObject->Release()<\/code><\/li>\n
    9. IOleObject->DoVerb(OLEIVERB_HIDE, NULL, IOleClientSite, 0, windowHandle_, NULL)<\/code><\/li>\n
    10. IOleObject->Close(OLECLOSE_NOSAVE)<\/code><\/li>\n
    11. OleSetContainedObject(IOleObject, FALSE)<\/code><\/li>\n
    12. IOleObject->SetClientSite(NULL)<\/code><\/li>\n
    13. CoDisconnectObject(IOleObject, 0)<\/code><\/li>\n
    14. IOleObject->Release()<\/code><\/li>\n<\/ol>\n
      IWebBrowser2->Quit()<\/code> should not be called for WebBrowser control (CLSID_WebBrowser), it is intended only for Internet Explorer object (CLSID_InternetExplorer).<\/p>\n
      Why must it be so hard?<\/p>\n<\/li>\n
    15. \n
      My experience is that some calls might need message processing to function properly. Try to pump some messages between your calls to Navigate<\/code>, Stop<\/code> etc. When working with the web browser interfaces I PostMessage<\/code> myself often to trigger the next step to make sure the previous step had time to complete.<\/p>\n
      The problem might be related to your child thread. You cannot access web browser interfaces between threads without some additional work. COM needs to be initialized as single-threaded apartment (STA). And you need to follow the rules of STAs:<\/p>\n
        \n
      • Every object should live on only one thread (within a single-threaded apartment). Initialize the COM library for each thread.<\/li>\n
      • Marshal all pointers to objects when passing them between apartments.<\/strong><\/li>\n
      • Each single-threaded apartment must have a message loop<\/strong> to handle calls from other processes and apartments within the same process. Single-threaded apartments without objects (client only) also need a message loop to dispatch the broadcast messages that some applications use.<\/li>\n
      • …<\/li>\n<\/ul>\n<\/li>\n
      • \n
        If I use DialogBox and drop a IEControl on it as a resource and DialogBox is derived from CAxDialogImpl – then while I call DestroyWindow() of dialogBox then it is automatically doing the cleanup() – which is what I required. But originally I wanted to get rid of DialogBox itself and use IEControl directly on my Window, it seems not..<\/p>\n<\/li>\n<\/ol>\n
        Originally posted 2014-02-04 02:41:50. <\/small><\/p>","protected":false},"excerpt":{"rendered":"
        I am using ATL in VisualC++10 to host browser control. My code is similar to this example: http:\/\/msdn.microsoft.com\/en-us\/library\/9d0714y1(v=vs.80).aspx Difference is I have main window and then child window hosts the browser control. After 2 minutes i have to close the browser completely kill the browser activeX but this child window should be alive and do […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2600","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/2600","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=2600"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/2600\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=2600"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=2600"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=2600"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}