Ccomptr provides a specialization for idispatch that enables it to store pointers to com automation components and invoke the methods on the interface by using late binding. We use cookies for various purposes including analytics. In this case we want to work with idispatch, which is a dynamic interface that lets us figure out which methods to call at runtime. The following functions both do the same logical operations. How to cast dual interfaces of microsoft powerpoint. Your question is better, but apparently nobody knows the answer or nobody wants to explain it.
The class is wizard generated, and inherits from idispatch. Contribute to seleniumhqselenium development by creating an account on github. The hresult returned from spselectionitem doesnt fail and mailptr2 is set now, however i run into issues when calling mailptr2s methods. When a create a new email message using automation outlook will crash if i try to request.
Heres an abbreviated version of ccomptr showing its most important parts. It means that you would get a pyidispatch instead of pyiunknown in those cases, but since pyidispatch is derived from pyiunknown this should. The problem here is that if the idispatch is null then the hr is never set by the line that fetches the irequest pointer. Autodesk understands that working remotely can be challenging.
Api help english only 2018 sp05 to disable web help from within solidworks and use local help instead, click help use solidworks web help. Once you have the pointer to iunknown you now have to ask for the actual interface that you would like to work with. If this is your first visit please consider registering so that you can post. Ok, how can i use queryinterface to get the idispatch pointer from an iunknown pointer. Hi, if you want to find out all possible objects then you need a idispatch pointer to excel. I need a class to run my version of queryinterface. Find answers to ihtmlelement and ihtmlelementcollection from the expert community at experts exchange. The idispatch interface performs its own release, so the code above calls release twice, the first time explicitly through the call dispatchrelease and the second time implicitly at the. I need to get this ipiehtmlinputhiddenelement interface from a ipiehtmlformelement element, but the input hidden interface seems to not be implemented. You then use queryinterface to in my interpretation tell the system that the idispatch object that swci points to is an icomponent2 object. New inspector word editor crash outlook 2003 outlook. Hi all, i have a rather interesting issue with outlook 2003.
Call queryinterface on the idispatch pointer, and ask for ihtmldocument2. I did change the declaration to ccomptr from ccomptr idispatch because i couldnt figure out how to convert between the two afterward. How to get that idispatch interface you can read more here. Youll soon see a version of this function that calls queryinterface.
As in the case of addref and release, the visual basic implementation of queryinterface is fairly straightforward, but you can never see it. The following two lines show how the error handling mechanisms in ccomptr and ccomqiptr differ. Application which you can then use to obtain itypeinfo, itypelib pointers to enumerate all the stuff. However, the second version may be less errorprone because it uses the ccomptr class. Application and id like to cast this idispatch to native documentwindow in order to call its methods and properties not via idispatch invoke, but directly. I know very little about com and nothing about atl but my guess is that you can just declare a ihtmldocument2 pdoc instead of the ccomptr spdoc because ccomptr is a pointer wrapper. Returns true if the connection was successful or false if the connection failed. You can rate examples to help us improve the quality of examples. Python for windows extensions old feature requests new. Ccomqiptr is for cases when you want to call queryinterface in a convenient manner. This code does not work for internet explorer versions 5. Tech support scams are an industrywide issue where scammers trick you into paying for unnecessary technical support services.
However, it seems that sometimes smart pointers are too smart in particular, im referring to the secret queryinterface ing assignment operator discussed by jared parsons on his blog. The ccomptr and ccomqiptr classes can help eliminate memory leaks by performing automatic reference counting. Ccomptr provides a specialization for idispatch that enables it to store pointers to com automation components and invoke the methods on the interface by using. The windows mfc active template library atl information and. An introduction to active template library atl part 2.
I recently found an article called capture an html document as an image. But if you want to do that you can use queryinterface to get idispatch pointer but that is not converting you will be getting a new pointer. Ccomqiptr adds a little more smarts by associating a guid for use as the interface id with a smart pointer. Ccomptr is a basic smart pointer that wraps com interface pointers. Use the automation interfaces inside your arx application. When you implement one or more userdefined interfaces in a class, visual basic provides an implementation of queryinterface that allows clients to move among interface references. The next line will always have a successful hr value because it comes from the previous success already checked and not from the queryinterface call. The constructor doesnt save the hresult from a failed queryinterface call. Ccomptr is a convenient smart pointer atl class to manage reference counting of com objects.
This means that you need to add extra python code to do a queryinterface in order to get a dynamic object where you can call the methods. By continuing to use pastebin, you agree to our use of cookies as described in the cookies policy. Mfc supports idispatch and com aggregation, you dont have to do a lot to get those features up and running. This is what ccomptr is helping you with, which is a smartpointer and provides auto release of objects. I also tried inheriting directly from iunknown, but still i never reached the breakpoint in my version of queryinterface. You can tell whether the query failed by checking for a null pointer, but you cannot determine why it fails. Manipulating the positions of desktop icons the old new. With ccomqiptr, the return value is the pointer itself, and if the call fails, the internal hresult return value cannot be accessed. A visual basic object automatically implements queryinterface. Ccomptr and releasing com objects manufacturing devblog. To report problems encountered with the web help interface and. You can help protect yourself from scammers by verifying that the contact is a microsoft agent or microsoft employee and that the phone number is an official microsoft global customer service number. Errorchecking routine that performs manual lifetime management of a com.
Todays little program demonstrates how you can manipulate the positions of desktop icons. If the call fails, an hresult is returned, which is the typical com pattern. However, there are two things i didnt like about it. Find out how to get set up to work from home or anywhere outside of your office. The following code samples demonstrate two approaches to consider make sure your arx projects supports the autocad activex client interfaces. That page actually recommends queryinterfaceing into a ccomptr, where you get an hresult stating what failed, over using ccomqiptr, where you always get nullptr and you have no idea why interface not implemented. For deeper understanding of connection points i suggest you read code projectcom dcom connection points and asynchronous calls part i. Hresult axgetidispatchofobjectacdbobjectid id, idispatch ppdisp, idispatch papp. The ccomptr class defines three assignment operators. And then im trying to to manipulate html which actually works in stand alone app with no problem. Do you have questions about working remotely or collaborating while using autodesk products. Because ccomptr and ccomqiptr do not hide calls to addref and release, this blind conversion causes a problem when the release is called through the dispatch smart pointer.