Problems with WUA COM object

[neogia]

Ok, so I got a working version of Windows Update using the WUA COM object. This works flawlessly, however there is no way of determining download or install progress the way I have it implemented. Here is what I would like to change:

$downloader = $updateSession.CreateUpdateDownloader ()
$downloader.Updates = $updatesToDownload
$downloader.Download ()
;Display results and Install

And I would like to change it to this:

$downloader = $updateSession.CreateUpdateDownloader ()
$downloader.Updates = $updatesToDownload
$downloadJob = $downloader.BeginDownload ()
$downloadProgress = $downloadJob.GetProgress ()
;While loop constantly checking $downloadProgress to update progress bar

This is how the downloader is to be implemented, except for one thing, I got an error in $downloader.BeginDownload (). Initially, it just crashed the script, but I wanted to see what was going on, so I implemented a COM error handler, and retrieved the hex error code: 8002000E After a quick google search of simply "8002000E", I found it meant "Incorrect number of arguments".

So I went back to trusty MSDN, and searched around to find that BeginDownload () requires 3 arguments, an IDownloadProgressChangedCallback, an IDownloadCompletedCallback, and whatever an AsyncState Property of IDownloadJob is, it needs one of those too.

So my plea is this: To whomever knows their way around COM objects, how on earth do I create, or otherwise retrieve the arguments which BeginDownload () requires? I'm stuck.

I've even searched the registry for an object Microsoft.Update.DownloadCallback, but it only contains the downloader.

Note: in order to utilize the WUA object, you have to download it here

Any help is as always much appreciated. Fellow programmer in learning.

[neogia]

Ok, I just realized something further. BeginDownload () doesn't require arguments that are specifically IDownloadProgressChangedCallback or IDownloadCompletedCallback or AsyncState, it requires two IUnkown*'s and a VARIANT, as follows:

HRESULT BeginDownload(
  IUnknown* onprogressChanged,
  IUnknown* onCompleted,
  VARIANT state,
  IDownloadJob** retval
);

Or maybe since VARIANT isn't VARIANT*, it might just require two objects of type IUnkown? I don't know, but I'll keep searching...

[neogia]

Wait a second, I've been looking all day, and from everything I'm reading, it looks like you can't create an object of type IUnknown... Is that true? If that's the case, then I'm stuck. I haven't found a single example or implementation reference for the IUpdateDownloader object. Except for the one on MSDN, and I can't figure out what they want me to pass into the call to BeginDownload(). I'm desperate here...

[SvenP]

Wait a second, I've been looking all day, and from everything I'm reading, it looks like you can't create an object of type IUnknown... Is that true? If that's the case, then I'm stuck. I haven't found a single example or implementation reference for the IUpdateDownloader object. Except for the one on MSDN, and I can't figure out what they want me to pass into the call to BeginDownload(). I'm desperate here...

Hello neogia,

Programming Windows Update (or Software Update Services) is very complicated.

One thing you must be aware of is the fact that Microsoft made two API's: One for C++/VB/.NET applications, and another for scripting hosts (VBscript,Cscript).

In your examples you are trying to access the C++ API from within a script. That won't work.

I can't give you a full solution, but you can find many Windows Update related example scripts at:

http://www.microsoft.com/technet/scriptcen...nt/default.mspx

Those are VBscript examples, but it should not be too difficult to convert them to AutoIt. I remember someone wrote a VBScript-to-AutoIt converter (can't currently find the post).

You can find more information about the Windows Update Agent API at:

http://msdn.microsoft.com/library/en-us/wu...rtal_client.asp

But keep in mind to use the scripting-interface, not the C++ interfaces.

Regards,

-Sven

[MadBoy]

Here's the link for VBscript to autoit converter..