how to input file and display the content to different area? - ATL / WTL / STL Discussion Boards

NotBear15-Jan-04 13:21

15-Jan-04 13:21

I have added an ATL object with connection points to my MFC project so I can expose methods and events to another application. How would I go about starting an instance of my object, so I can fire events from, say, a button click? I'm new to C++ and ATL programming, so please bear with me if my question is stupid.

Regards,
NotBear

CComPtr -> CoCreateInstance failes when threaded!?

virtualnik14-Jan-04 0:42

virtualnik

14-Jan-04 0:42

Hello!

Hope someone can help me.

First some explanation:
I have a function (from the DX9 C++ Help) that grabs a video frame from any DirectShow supported Video file. It works fine so far, no problems.

BUT (as always Smile | :)

)

if i call this function in a thread, CoCreateInstance failes (using ATL Smart Pointers with IMediaDet).

Here is the begin of the function to the point where FAILED is true:
HRESULT GetBitmap(LPTSTR pszFileName, BITMAPINFOHEADER** ppbmih)
{
HRESULT hr;
CComPtr<imediadet> pDet;
hr = pDet.CoCreateInstance(__uuidof(MediaDet));
if (FAILED(hr))
return hr;

The function where i am calling GetBitmap() looks this way:
unsigned __stdcall DoStuffThreaded( void *pArguments )
{
for( ;; )
GetBitmap()
.. do stuff etc

_endthreadex(1);
}

and the thread function is started with:
hThread = _beginthreadex(NULL, 0, DoStuffThreaded, (void*)pParam, NULL, &uiID);

Again, if i call GetBitmap() the usual way (not in a thread) it works perfect.

Do i need to initialize ATL in some way to make it work in a thread?

Thanks for any help/hints/solutions!

Nik

Re: CComPtr -> CoCreateInstance failes when threaded!?

virtualnik14-Jan-04 2:06

virtualnik

14-Jan-04 2:06

Ok, i am stupid.

Doing a
CoInitialize(NULL);
at the beginning
and a
CoUnitialize();
at the end
solves the problem...

Nik

Re: CComPtr -> CoCreateInstance failes when threaded!?

Lim Bio Liong14-Jan-04 5:08

Lim Bio Liong

14-Jan-04 5:08

Hello Virtualnik,

The reason why CoInitialize() and CoUninitialize() are required is to enable COM to support Apartment Threaded Models. In an Apartment Threaded Model, each thread owns the COM objects that are created in the thread.

When a thread wants to access the COM objects created in another thread, the COM object must be marshalled to the thread that wants the access. In order that threads be able to perform marshalling, CoInitialize() and CoUninitialize() must be called in each thread.

Hope the above will shed more light.

Thanks,
Bio.

Re: CComPtr -> CoCreateInstance failes when threaded!?

virtualnik14-Jan-04 12:23

virtualnik

14-Jan-04 12:23

Thank you for the explanation!

Nik

ASSERT Trouble

Monty²13-Jan-04 23:42

Monty²

13-Jan-04 23:42

I am Using

CComPtr<IHTMLElement> m_pBody;

as a Class Member

and in the DocumentComplete() Handler of BHO

hr = spHTML->get_body(&m_pBody); <-ASSERTION FAILED 2nd Time
if (FAILED(hr))
  return hr;

When the Code Executes second time this assertion fails

Excerpts from CComQIPtr class

//The assert on operator& usually indicates a bug.  
//If this  is really what is needed, however, take the address of the p member explicitly.

T** operator&()
{
   ATLASSERT(p==NULL);
   return &p;
}

if i don't use CComQIPtr then everything is ok but it sometimes crashes

what does this assert means what am i doing wrong ?

Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi

Re: ASSERT Trouble

Tim Smith14-Jan-04 16:24

Tim Smith

14-Jan-04 16:24

You are using that variable twice without releasing the first object. To release the first object, set the value to NULL.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

how to input file and display the content to different area?

freehawk13-Jan-04 23:11

freehawk

13-Jan-04 23:11

Now I want to read a file and display the content of file to different areas
of same veiw (some areas can be inputed some words, and others can not be
inputed), How to do?

CHeaderCtrl + CRichEditCtrl?
CHeaderCtrl + CListView?
or other way?

BTW, the size of file is very big.

Please teach me how to do?
Do you have sample about it?

-Freehawk.

ATL's auto IDL generating is adding A/W to my methods!

Todd Jeffreys13-Jan-04 10:05

Todd Jeffreys

13-Jan-04 10:05

It's common to see FunctionA and FunctionW for ANSI/UNICODE versions, however my ATL functions are being created like this which is not good.

For example, I made a method called OpenService which returns an IService object (of my creation) and takes as a parameter a BSTR.

So the declaration is as follows:

<br />
__interface IConfigurer : IDispatch<br />
{<br />
	[id(1), helpstring("method Open")] HRESULT Open([in] BSTR machineName);<br />
	[id(2), helpstring("method Close")] HRESULT Close(void);<br />
	[id(3), helpstring("method OpenService")] HRESULT OpenService([in] BSTR serviceName, [out,retval] IDispatch** ppService);<br />
};<br />

I havn't done ATL since VC 6.0 and I'm using 2003 .NET now. It auto creates the IDL file and outputs the OpenService function as OpenServiceA. Aren't BSTR's not supposed to require A/W or distinctions since they are always wide?
I'm an ATL 7.0 noob so help me out Wink | ;-)

Re: ATL's auto IDL generating is adding A/W to my methods!

Jörgen Sigvardsson13-Jan-04 10:29

Jörgen Sigvardsson

13-Jan-04 10:29

I saw the EXACT same thing today! I have not yet fully investigated the matter further - I was on my way home when I spotted a method of mine, OpenService, having the name OpenServiceW.

I am not 100% sure of what's going on, but it wouldn't surprise me that there's some function in the system headers that looks something like this:

#ifdef _UNICODE
#define OpenService OpenServiceW
#else
#define OpenService OpenServiceA
#endif

If you want to, you can investigate this and post what you find - that ought to be good reading tomorrow morning Smile | :)

--
I am perpetual, I keep the country clean.

Closing all browser windows

Vermithrax12-Jan-04 9:39

Vermithrax

12-Jan-04 9:39

Hey there. Smile | :)

Does anyone know how to close all open Internet Explorer windows? I've seen other programs out there that do this, but have no idea of how to do this myself. Smile | :)

Thanks in advance! Confused | :confused:

GlobalMultiUse Objects

Roozbeh6910-Jan-04 19:20

Roozbeh69

10-Jan-04 19:20

Hello everybody,
How do I define or create root or application objects in VC++ ATL projects like GlobalMultiUse objects in VB ActiveX DLL projects?

Regards,
Roozbeh

Re: GlobalMultiUse Objects

Vi214-Jan-04 4:58

Vi2

14-Jan-04 4:58

It is ordinary ATL (or COM) object, but having [appobject] attribute.

With best wishes,
Vita

A question for Variant Byref parameter In StdMethodImplementation

eternalme10-Jan-04 0:38

eternalme

10-Jan-04 0:38

hi i have a atl component with one interface with three byref variant parameters coming inside my StdMethodImplementation,
the client is always asp.
namely vin1,vin2,vin3
vin1 and vin2 are arrays of unknows dimentions
they can be single dimention and may be double dimention array,i need to read vin1 and if it is array i need to read some certain index of it and change it to some allcaps and another little string saying "changed ".
the problem is i am not able to access the variant inside the implementation, is it coming as safearray for i don't get any thing, i tried copying vin1 values to vin2 it didn't work.
any idea what could be wrong.
and if possible is there any sample available for handling variant arrays inside ole object.
regards.
Cry | :((

before you know it is past.
0x5c06abc0, 0x2dcd, 0x11ce, 0x84, 0x17, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71

How can I get WM_SIZE event for the BandObject

saisrinivasaln8-Jan-04 20:37

saisrinivasaln

8-Jan-04 20:37

Hi I need to get WM_SIZE event for Toolband object.I need to resize a control which is hosted on it accordinding to band width.Help would be appreciated.

Thanks

Sai

Re: How can I get WM_SIZE event for the BandObject

Jörgen Sigvardsson10-Jan-04 0:24

Jörgen Sigvardsson

10-Jan-04 0:24

You could always subclass it and intercept the WM_SIZE message. When you intercept the message, call the default window procedure for the toolband object, and when it returns, you can perform your specific action.

--
If there was a problem, Yo, I'll solve it!
Check out the hook while my DJ revolves it.

ATL file downloading

Balkrishna Talele6-Jan-04 22:36

Balkrishna Talele

6-Jan-04 22:36

I want to downlaod ( e.g www.codeproject.com/index.html) using ATL (without any support of MFC). How can I implement it using ATL. Any code/IDea/URL will be highly acknowledgement.

Re: ATL file downloading

geo_m7-Jan-04 4:54

geo_m

7-Jan-04 4:54

look to the CBindStatusCallback in MSDN help. Usage is like:

<br />
CBindStatusCallback<CATLAsync>::Download(this, OnData, m_bstrURL, m_spClientSite, FALSE);<br />

Re: ATL file downloading

Michael Dunn7-Jan-04 10:58

Michael Dunn

7-Jan-04 10:58

Using Internet Explorer to download files for you[^]

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0! | RightClick-Encrypt
Pinky, are you pondering what I'm pondering?
I think so Brain, but if we shaved our heads, we'd look like weasels!

Re: ATL file downloading

Jörgen Sigvardsson7-Jan-04 12:46

Jörgen Sigvardsson

7-Jan-04 12:46

The pCaller argument in your article is described as Pointer to the controlling IUnknown interface of the calling Microsoft® ActiveX® component (if the caller is an ActiveX component). ... The function attempts the download within the context of the ActiveX client framework and allows the caller's container to receive callbacks on the progress of the download. in the MSDN docs.

Now, exactly what does the last part really mean? Will it query the pCaller for a specific interface? If so, do you know which? I wish the MSDN could be a bit clearer sometimes. Mad | :mad:

--
If there was a problem, Yo, I'll solve it!
Check out the hook while my DJ revolves it.

Re: ATL file downloading

Michael Dunn7-Jan-04 18:56

Michael Dunn

7-Jan-04 18:56

Unfortunately no, I don't know what that param is really used for. Frown | :(

I've only ever used URLDownloadToFile() from normal apps/DLLs.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0! | RightClick-Encrypt
You cannot truly appreciate Dilbert unless you've read it in the original Klingon.

Re: ATL file downloading

Balkrishna Talele7-Jan-04 17:10

Balkrishna Talele

7-Jan-04 17:10

hey!!!thanks a lot Michael.(this is what i was searching for..)One again thanks, u saved my 1 days of extra coding
regards
Balkrishna Talele

BHO Advise

Monty²6-Jan-04 21:29

Monty²

6-Jan-04 21:29

Hi All This is My First Post in this Group (Hope i Will Get To Learn a lot Here)

Here is my Query
I want a Browser Helper Object in ATL.
(Any FAQ's Link Will be Much Appriciated)

Is it Possible To Change the Contents of a Browser(window) Through the BHO's ?
I want to UnderLine a few Keywords that are in the WebSite being Displayed in Browser Window , Is It Possible ?

Thanks All Smile | :)

Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi

Got it

Monty²7-Jan-04 19:11

Monty²

7-Jan-04 19:11

IHTMLDocument2->write will let me write in the browser window.

i'll get the HTML parse it add a few tags and write it back

is it ok or am i dreaming Smile | :)

Any Comments/Suggestions ?

Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi

how to realize CWinThread in WTL project?

freehawk6-Jan-04 21:01

freehawk

6-Jan-04 21:01

I have a lot of source code where CWinThread is used. How to change CWinThread to a WTL project? Thank you.

Freehawk

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