Re: Build Problem - ATL / WTL / STL Discussion Boards

Anonymous16-Oct-02 18:39

16-Oct-02 18:39

I am somewhat new to proxy stubs. I have been playing around with building a proxy stub. So, I used VC6's to create ATL COM exe.

I have added a method to the interface and everything compiles and links and all that.

Now, I am trying to use CoCreateInstanceEx to instantiate this interface in my client application with the CLSID of my interface and using the CLSCTX_SERVER parameter. Everything compiles and links on the client as well, but when it gets to the CreateInstance part, I get an HR that indicates the Interface is not supported.

I am not sure if this is an open-ended question or not, but is there an easy fix to this? Have I missed a step or something?

thanks

Re: Proxy-Stub Question

James R. Twine17-Oct-02 4:52

James R. Twine

17-Oct-02 4:52

IIRC, a proxy/stub is required when crossing apartments or remoting (DCOM). Have you built the ATL COM object with merged proxy/stub code?

Peace!

-=- James (Sonork:100.21837)
"There is nothing worse than being oblivious to the fact that you do not know what you are doing."
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IDispatchImpl problem with shell extension

Heath Stewart15-Oct-02 17:56

Heath Stewart

15-Oct-02 17:56

I'm working on a new shell extension (I've written them before, just not this kind...) implementing IShellExtInit and IContextMenu. IShellExtInit::Initialize works correctly - but is called a random number of times (seems to depend on how long it takes me to step throuh the code) for a single action in Explorer. After about 1 to 3 times, the debugger breaks to this colling block of code:

<br />
template <class T, const IID* piid = &__uuidof(T), const GUID* plibid = &CAtlModule::m_libid, WORD wMajor = 1,<br />
WORD wMinor = 0, class tihclass = CComTypeInfoHolder><br />
class ATL_NO_VTABLE IDispatchImpl : public T<br />
{<br />
public:<br />
	typedef tihclass _tihclass;<br />
// IDispatch<br />
	STDMETHOD(GetTypeInfoCount)(UINT* pctinfo)<br />
	{<br />
		*pctinfo = 1; //Breaks here<br />
		return S_OK;<br />
	}<br />

The interface and typelib GUID for the template are mine (and other COM automation servers in the library work). What could be causing this problem?

I've tried approaching it from many different angles, but have yet to figure out 1) why IShellExtInit::Initialize is getting called multiple times before IContextMenu is even QI'd, and 2) why it'd break here (I'm sure it's related to #1).

TIA

"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons

Re: IDispatchImpl problem with shell extension

Michael Dunn15-Oct-02 19:45

Michael Dunn

15-Oct-02 19:45

Shell extensions aren't automation servers, they don't need to implement IDispatch. It's odd that the shell is QI'ing for IDispatch in the first place, actually. My first suggestion is to remove IDispatch from the extension coclass.

--Mike--
"I'd rather you just give me a fish today, because even if you teach me how to fish, I won't do it. I'm lazy." -- Nish
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Re: IDispatchImpl problem with shell extension

Heath Stewart15-Oct-02 20:15

Heath Stewart

15-Oct-02 20:15

Right, I realize that they're not automation servers (I mean that automation servers exists in my library) but every example - including yours - leaves the default ATL stuff there (which extents IDispatchImpl). ATL put it there in the first place and it's never caused problems with the many other shell extensions I've written (what can I say, I'm never content). I agree that it's not needed, though.

I'll try removing that, however, and see what happens. Thanks for the tip.

"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons

Re: IDispatchImpl problem with shell extension

Heath Stewart15-Oct-02 20:27

Heath Stewart

15-Oct-02 20:27

Even after removing everything related to IDispatch, the problem persists: IShellExtInit::Initialize is called many times, with different addresses for the parameters, until the runtime finally throws an exception, such as the ol' access violation for reading memory at NULL.

The IShellExtInit::Initialize implementation is exactly as yours is.

"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons

Build Problem

Rene De La Garza15-Oct-02 5:27

Rene De La Garza

15-Oct-02 5:27

i made an ATL/Com project and it works just fine in debug mode but when im trying to build Win32 Release MinDependency, i get this error:

LIBCMT.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
ReleaseMinDependency/Tokenizer.dll : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

any suggestion?

Re: Build Problem

Steve S15-Oct-02 6:27

Steve S

15-Oct-02 6:27

MSDN Q291952 should solve this;
You could try the MinSize version to verify it builds first.

Steve S
[This signature space available for rent]

Re: Build Problem

Rene De La Garza15-Oct-02 9:54

Rene De La Garza

15-Oct-02 9:54

thanks i`ll check it out

Re: Build Problem

Michael Dunn15-Oct-02 10:35

Michael Dunn

15-Oct-02 10:35

This is answered in the VC forum FAQ.

--Mike--
"I'd rather you just give me a fish today, because even if you teach me how to fish, I won't do it. I'm lazy." -- Nish
Just released - 1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
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Re: Build Problem

Rene De La Garza15-Oct-02 10:37

Rene De La Garza

15-Oct-02 10:37

thanks a lot, that solved the problem.

WTL - CFileDialog

Giles14-Oct-02 23:52

Giles

14-Oct-02 23:52

I'm trying to get a file name. Sound easy enough.

CString strFileName;<br />
	static TCHAR szFilter[] = "Comma Delimited (*.csv)\0*.csv\0All Files(*.*)\0*.*\0\0";<br />
<br />
	GetDlgItemText(IDC_EDIT_LOOKUP, strFileName);<br />
	<br />
	CFileDialog dlg(TRUE, NULL, strFileName, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_FILEMUSTEXIST , szFilter, NULL);<br />
<br />
	if(dlg.DoModal() == IDOK)<br />
	{<br />
		TCHAR szFileName[MAX_PATH + 64];<br />
		dlg.GetFilePath(szFileName, MAX_PATH + 64);<br />
		<br />
		SetDlgItemText(IDC_EDIT_LOOKUP, szFileName);<br />
	}

The problem is when I call GetFilePath, I get an ATLASSERT, because the window handle is 0. I thought this should be straight forward. Everything else is populated okay, but clicking OK seems to kill the window handle before I get the file name. Or should I be calling a different function.

Re: WTL - CFileDialog

Ed Gadziemski15-Oct-02 4:06

Ed Gadziemski

15-Oct-02 4:06

Try this in place of dlg.GetFilePath:

lstrcpy(szFileName, dlg.m_szFileName);

Re: WTL - CFileDialog

Giles15-Oct-02 6:07

Giles

15-Oct-02 6:07

Ed Gadziemski wrote:
Try this in place of dlg.GetFilePath:

lstrcpy(szFileName, dlg.m_szFileName);

I did not bother trying that as its a protected member. But it works. Confused | :confused:

Re: WTL - CFileDialog

Ed Gadziemski16-Oct-02 3:35

Ed Gadziemski

16-Oct-02 3:35

m_szFileName is a public member, defined as follows:

TCHAR m_szFileName[_MAX_PATH]; // contains full path name after return

The reason GetFilePath asserted is that you referenced it after the dialog function returned. It no longer has a valid handle at that point.

Re: WTL - CFileDialog

Giles16-Oct-02 8:00

Giles

16-Oct-02 8:00

Ed Gadziemski wrote:
m_szFileName is a public member, defined as follows:

Yep, I see what I did wrong now. When I browsed to the member, I ended up on the MFC Version, rather than the ATL version. In MFC its protected. I'll know next time to check which one I'm looking at. Blush | :O

Thanks for all your help. Big Grin | :-D

Re: WTL - CFileDialog

Michael Dunn15-Oct-02 19:47

Michael Dunn

15-Oct-02 19:47

GetFilePath() is only for use when writing a hook (notice how the method sends a window message). To get the selected file after the dialog is closed, look at the m_szFileName memeber of CFileDialog.

--Mike--
"I'd rather you just give me a fish today, because even if you teach me how to fish, I won't do it. I'm lazy." -- Nish
Just released - 1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
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Re: WTL - CFileDialog

Giles16-Oct-02 7:55

Giles

16-Oct-02 7:55

Thanks. I've since found examples of how its typically used when sub classing, which I suppose what templates are all about.

I'm new to WTL, and am still working out the differences with MFC. Getting there though.

ReleaseMinSize and ReleaseMinDependency

ahsanjamal14-Oct-02 20:23

ahsanjamal

14-Oct-02 20:23

I am using ATL/COM in visual C++. I want to ask that what is the difference between ReleaseMinSize build and ReleaseMinDependency build. I want to distribute my DLL such that no other DLL should be required. I am also using MFC support for that component.

The difference I noticed between two was that ReleaseMinSize generate DLL larger in size than MinDependency. From this I think that MinSize require no other DLL to be distributed and RealaseMinDependency require DLLS to be given with my DLL.

Any IDeas

Ahsan

Ahsan

find of STL

IMiracle14-Oct-02 15:35

IMiracle

14-Oct-02 15:35

I have a code statements using STL and CString of MFC in VC6:

#include <vector>
#include <afx.h>

int FindString(LPCTSTR lpszFind)
{
/**
strs is defined as vector<CString>,
it is modified out of there
*/

vector<CString>::iterator pos;

pos = find(strs.begin(), strs.end(), lpszFind); // Error line
....
}

The building error:
error C2440: '=' : cannot convert from 'const class CString *' to 'class CString *' Conversion loses qualifiers

Re: find of STL

Christian Graus14-Oct-02 16:00

Christian Graus

14-Oct-02 16:00

It would help if you used the <> buttons below, so we could see your template arguments and includes.

What on earth is m_lstPy ? Are you trying to use STL to do a find within a string, or what ?

Christian

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

Re: find of STL

Joaquín M López Muñoz14-Oct-02 21:03

Joaquín M López Muñoz

14-Oct-02 21:03

OK. Try declaring pos as

vector<CString>::const_iterator pos;

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

CString with ATL/WTL 7.0

Giles13-Oct-02 6:20

Giles

13-Oct-02 6:20

I've got an app, generated with the ATL app wizard in VC7.

Now it was compiling fine, until I added a CSting object to a function, and now it gets upset, saying it does not know what one is, yet I know CString is in ATL now.

Any ideas what could be happening? I'm getting error C2065 - undeclared identifier.

Anyone know which header file its in so I can include it explicitly?

Re: CString with ATL/WTL 7.0

Bjoern Graf13-Oct-02 7:04

Bjoern Graf

13-Oct-02 7:04

It's quite obvious - and mentioned in the help for CStringT Wink | ;)

#include <atlstr.h>

Bjørn.

Re: CString with ATL/WTL 7.0

Giles13-Oct-02 7:13

Giles

13-Oct-02 7:13

Bjoern Graf wrote:
It's quite obvious - and mentioned in the help for CStringT

Ahh yes Blush | :O

Must remember to turn my brain on.

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