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on CoUnmarshalInterface

Posted Monday, August 07, 2006 3:46 PM by jeffdav

CoUnmarshalInterface() and CoGetInterfaceAndReleaseStream() are not re-entrancy safe. This has certain implications for objects that attempt to unmarshal interfaces into member variables, as a member of my team recently discovered. Suppose you have something Read More...

0 Comments

Filed under: code

pop-up blocker and ActiveX controls, part one: IWebBrowser::Navigate(), IWebBrowser::Navigate2()

Posted Wednesday, May 17, 2006 2:42 PM by jeffdav

As I mentioned previously , one reason users may continue to experience unwanted pop-up windows while browsing is creative use of ActiveX controls that provide methods that allow web sites to open new browser windows. This series of posts will provide Read More...

8 Comments

Filed under: internet explorer, code

IOleCommandTarget, CGID_MSHTML and ActiveX controls

Posted Friday, April 21, 2006 2:02 PM by jeffdav

If you write an application that hosts the WebBrowser Control , and you want the control to do something, you can send commands to mshtml via the IOleCommandTarget interface. However, if you are an ActiveX control and you want to send CGID_MSHTML commands, Read More...

6 Comments

Filed under: internet explorer, code

on getting IOleCommandTarget wrong (and a bit in the middle about ActiveX controls)

Posted Tuesday, April 11, 2006 11:32 AM by jeffdav

IOleCommandTarget is very useful. It provides a generic way of sending commands between objects. IE makes extensive use of IOleCommandTarget , both publically and internally. And, like IUnknown , people frequently get it wrong. Each command is composed Read More...

7 Comments

Filed under: internet explorer, code

on 64 bit data conversion, comctl32 and reading the documentation

Posted Thursday, April 06, 2006 2:57 PM by jeffdav

Question: What is wrong with this code? case WM_DRAWITEM: { LPDRAWITEMSTRUCT pdis = (LPDRAWITEMSTRUCT) lParam; COMBOBOXEXITEM cbexItem = {0}; cbexItem.mask = CBEIF_IMAGE | CBEIF_SELECTEDIMAGE; cbexItem.iItem = pdis->itemID; CallWindowProc(pfnOldWndProc, Read More...

0 Comments

Filed under: code

on IObjectWithSite, IOleObject and ActiveX controls

Posted Tuesday, March 28, 2006 9:45 AM by jeffdav

ActiveX® controls frequently need to communicate with their containing object. For example, a control may want to QueryService for the cached InternetSecurityManager object to decide whether or not to take a particular action . Controls can obtain a pointer Read More...

6 Comments

Filed under: internet explorer, code

the importance of context

Posted Tuesday, May 11, 2004 2:07 PM by jeffdav

Almost every navigation in Internet Explorer results in a flurry of security checks. Many of these checks are fairly obvious things, such as checking the URL of the current location (the context URL ) and the pending navigation's destination URL to see Read More...

8 Comments

Filed under: internet explorer, code

on calling refresh during onResize

Posted Tuesday, April 20, 2004 12:33 PM by jeffdav

From time to time I have come across web sites that do something like this: <body onResize=“document.execCommand('Refresh')”> ... </body> Generally this is done so the page can redo all of the necessary layout calculations for Read More...

3 Comments

Filed under: internet explorer, code

a brief history of setHomePage()

Posted Tuesday, April 13, 2004 3:25 PM by jeffdav

I started working on IE right after IE 5.5 shipped. Since then, there is one little feature which has been the subject of my loving attention from time to time-- setHomePage() . setHomePage() is implemented as a behavior in iepeers.dll. It takes one argument-- Read More...

14 Comments

Filed under: internet explorer, code

channel 9

Posted Thursday, April 08, 2004 1:07 PM by jeffdav

If you have not had a chance to check out channel 9 , click on over. Read More...

1 Comments

Filed under: misc, computers, code

avoiding script injection and other lessons

Posted Friday, February 06, 2004 12:43 PM by jeffdav

MSDN has had an article entitled Security Considerations: Dynamic HTML for a while. It is a good article, but it simply says what not to do. Everytime I run across it I promise myself I am going to write something more useful someday, something that says Read More...

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Browse by Tags

on CoUnmarshalInterface

pop-up blocker and ActiveX controls, part one: IWebBrowser::Navigate(), IWebBrowser::Navigate2()

IOleCommandTarget, CGID_MSHTML and ActiveX controls

on getting IOleCommandTarget wrong (and a bit in the middle about ActiveX controls)

on 64 bit data conversion, comctl32 and reading the documentation

on IObjectWithSite, IOleObject and ActiveX controls

the importance of context

on calling refresh during onResize

a brief history of setHomePage()

channel 9

avoiding script injection and other lessons

enums and DeleteMenu()