ATL / WTL / STL

Re: How to achieve receiving file name using ICopyHook interface?

17-Jan-09 23:01

Do you mean a cut, copy or paste performed within Word? If so, I don't think so - the documentation[^] seems pretty clear that an ICopyHook handler is a shell extension, so would form part of Explorer, and that it only gets to approve/disapprove operations on folders or printers.

gopu7418-Nov-09 5:53

gopu74

18-Nov-09 5:53

Yes it's possible How to catch copy paste from explorer using shell extension? ICopyHook alternative for files and folder[^]

ATL COM and DLL comparision........... [modified]

vijay.victory13-Jan-09 23:52

vijay.victory

13-Jan-09 23:52

Hi Experts,

I m bit confused about ATL COM applications..and DLL
As I have already developed and using DLL(MFC/NON MFC) created in VC 6.0.
So Is there any advantages if I covert this into ATL COM. what are they??

And if I m capable of doing so..i.e. Converting DLL(MFC/NON MFC) into ATL COM application
then Whats type of care must have to be taken???
Like ...........
1> Global and local variable .or
2> Public/protected members of CLASS .or
3> Exported functions of DLL
plz guide me..and clear my confusion....

Thanx in advance..
Victory

modified on Wednesday, January 14, 2009 2:16 PM

Re: ATL COM and DLL comparision...........

Stuart Dootson14-Jan-09 10:37

BSTR=> CHARACTER ARRAY => BSTR conversion

14-Jan-09 10:37

Using COM makes it easier to use your DLL with languages other than C++, for example VBA or VB.

vijay.victory wrote:
As I have already developed and using DLL(MFC/NON MFC) created in VC 6.0.
So Is there any advantages if I covert this into ATL COM

If it ain't broke, don't fix it.

vijay.victory wrote:
And if I m capable of doing so..i.e. Converting DLL(MFC/NON MFC) into ATL COM application
then Whats type of care must have to be taken Like ...........
1> Global and local variable .or
2> Public/protected members of CLASS .or
3> Exported functions of DLL

Sounds like you need to learn about COM first...

COM defines a mechanism by which you can define and use objects in a (relatively) language independent manner. You expose objects through interfaces (a.k.a. pure abstract classes). Globals and locals aren't so much of an issue, as functionality is exposed in an OO way. Public/protected class members aren't an issue, as you only expose methods that implement (public!) interface methods. Exported functions aren't an issue - the COM specification tells you what functions to export (DllGetClassObject and DllRegisterServer)

CHAN_SAI13-Jan-09 22:54

CHAN_SAI

13-Jan-09 22:54

Hello,

My task is to encrypt the body of the e-mail and send to receiver.

On receiver side, decrypt and display the content.

The input to my encryption algo is unsigned char.

So I did like below

Sender=>;

get_Body() => BSTR => UCHAR => ENCRYPT => ENCRYPT_UCHAR => BSTR => put_Body()

Receiver =>;

get_Body() => BSTR => ENCRYPT_ UCHAR => DECRYPT => BSTR => put_Body

The problem I am facing is, the ENCRYPT_ UCHAR of sender is different from receiver.

I tried to convert in the sender side, by converting the BSTR to ENCRYPT_UCHAR before put_Body..the data is fine.

I am using W2A and A2W for conversion.

Thanks in advance

SAI

Re: BSTR=> CHARACTER ARRAY => BSTR conversion

Stuart Dootson13-Jan-09 23:54

Re: BSTR=> CHARACTER ARRAY => BSTR conversion

13-Jan-09 23:54

It's probably not wise to treat an encrypted message as a character stream - I would suggest you treat it as a stream of bytes instead - which, to be honest, is what unsigned chars usually represent in C/C++.

In fact, I wouldn't bother to convert from BSTR to unsigned char using a charset->charset mapping. I would just treat the BSTR as a set of bytes (aka unsigned chars). You can do this as shown in this sample program:

#include <windows.h>
#include <oleauto.h>
#include <iostream>
#include <iterator>

#pragma comment(lib, "oleaut32")

int main(int argc, char** argv)
{
   const wchar_t* s = L"Hello World";
   BSTR bs = SysAllocStringLen(s, lstrlenW(s));
   
   unsigned char *byteStream = (unsigned __int8 *)bs;
   ULONG byteCount = SysStringByteLen(bs);
   
   std::cout << "byteCount = " << byteCount << std::endl;
   std::cout << "bs (in bytes) = ";
   for(unsigned char * p=byteStream;p!=byteStream+byteCount;++p)
        std::cout << std::hex << (int)(*p) << " ";
   std::cout << std::endl;
}

This shows the bytes that make up the BSTR. You can then encrypt that set of bytes.

If you are returning a BSTR because it's an easy to use container, you can create a BSTR from a set of bytes as follows:

unsigned char *encryptedByteStream;
ULONG encryptedByteCount;
// Perform the encryption - let's assume you set encryptedByteStream as the
// first encrypted byte, encryptedByteCount is the number of encrypted bytes.

BSTR outputBS = SysAllocStringByteLen(encryptedByteStream, encryptedByteCount);

HTH!!

CHAN_SAI14-Jan-09 14:37

CHAN_SAI

14-Jan-09 14:37

Hello,
Thanks for your reply..

I am getting the below error on adding the source code.
initializing' : cannot convert from 'unsigned __int8 *' to 'unsigned char *'

Could you please suggest me to solve this.

Thanks

Re: BSTR=> CHARACTER ARRAY => BSTR conversion

Stuart Dootson14-Jan-09 20:56

ATL_MSG_MAP identifier not found

14-Jan-09 20:56

Whoops - there was a typo - change

unsigned char *byteStream = (unsigned __int8 *)bs;

unsigned char *byteStream = (unsigned char *)bs;

Interestingly, I don't get that error with VC++ 2003, 2005 or 2008 - which compiler are you using - VC++ 6?

josip cagalj13-Jan-09 0:57

13-Jan-09 0:57

Hi, it seems that only I post questions around here, not a happy site Smile | :)

However, here I am having problems again. This time I get to play around with dialogs and controls guided by article series from Michael Dunn called "WTL for MFC programmers and something".
The problem is I can't add map entry

ATL_MSG_MAP(1)
    MSG_WM_SETCURSOR(OnSetCursor_OK)

I'm getting errors:
"syntax error : missing ';' before identifier 'MSG_WM_SETCURSOR'"
"'ATL_MSG_MAP': identifier not found"
"'OnSetCursor_OK' : undeclared identifier"

I'm on WinXP using VS2008
Thanks in advance

Stuart Dootson13-Jan-09 4:09

13-Jan-09 4:09

I think that should be ALT_MSG_MAP - A<span style="font-weight: bold;">LT</span>, not A<span style="font-weight: bold;">TL</span>. You'll need to #include atlwin.h.

josip cagalj13-Jan-09 21:18

13-Jan-09 21:18

I already included atlwin.h in stdafx.h!
Don't quite understand your replay "I think that should be ALT_MSG_MAP - ALT, not ATL"?
Anyway big thanks to you!

Stuart Dootson13-Jan-09 21:29

13-Jan-09 21:29

You typed "ATL_MSG_MAP" in your original message. That symbol isn't in ATL, but ALT_MSG_MAP is, i.e. I think you made a typo at some point.

josip cagalj13-Jan-09 22:57

13-Jan-09 22:57

Need your help again, this time it's about adding notify handler for LVN_ITEMCHANGED message which is sent from listview ctrl.
NOTIFY_HANDLER_EX(IDC_LIST,LVN_ITEMCHANGED,OnListItemchanged)
I've included atlcrack.h but still get complaints?
I know that I'm trying to use code for WTL 7/7.1 while I have WTL 9 installed on VS2008 but I'm stern to go trough the series of articles here on CP by Dunn.
And sorry if I'm a pain to you Sniff | :^)

josip cagalj13-Jan-09 23:13

13-Jan-09 23:13

Solved the entry was in the wrong map!

Stuart Dootson13-Jan-09 23:23

13-Jan-09 23:23

josip cagalj wrote:
I'm stern to go trough the series of articles here on CP by Dunn

They're good articles - Michael's (to my mind) one of the most knowledgeable WTL experts.

josip cagalj wrote:
sorry if I'm a pain to you

If you were, I probably wouldn't be answering your questions Smile | :)

josip cagalj13-Jan-09 23:35

13-Jan-09 23:35

Thanks for previous post.
I tried to add a dialog to my app so after designing one mfc wizard showed up for adding a class for the new dialog so I followed it. When I compiled afterward i got an error saying "fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h>", I deleted the dialog and corresponding *.h and *.cpp from project but the error persist?

I think I need to skip the mfc wizard and manually add an class for the new dialog I've designed class:

class CMyNewDlg : public CDialogImpl<cmaindlg>,
public CWinDataExchange<cmynewdlg>
{

public:
enum { IDD = IDD_MYNEWDLG };
CMyNewDlg();
...

If so can I add this in existing .h file like CMainDlg.h or I need to manually add CMyNewDlg.h and CMyNewDlg.cpp files?

Stuart Dootson13-Jan-09 23:43

13-Jan-09 23:43

It probably added one or more MFC include files (afx.h?) to your stdafx.h. Remove those.

josip cagalj14-Jan-09 2:51

14-Jan-09 2:51

What this means:
error C2039: 'SubclassWindow' : is not a member of 'WTL::CTreeViewCtrlT<tbase>'</tbase>
I've placed an treeview ctrl on my new dlg and everything is ok when I use m_wndTree.Attach(GetDlgItem(IDC_TREE));
but when I want to use DDX_CONTROL like this

BEGIN_DDX_MAP(CMyTreeDlg)
    DDX_CONTROL(IDC_TREE, m_wndTree)
END_DDX_MAP()

I get above error

Stuart Dootson14-Jan-09 3:29

what is the event i should use

14-Jan-09 3:29

I believe you need to declare m_wndTree with type CContainedWindowT< CTreeViewCtrl > for it to have a SubclassWindow member.

[edit]You also need to construct m_wndTree correctly:

If m_wndTree doesn't have a message map (using ALT_MSG_MAP)

CMyTreeDlg() : m_wndTree(this)
    .    .    .
    .    .    .

If m_wndTree has a message map (using ALT_MSG_MAP(number)

CMyTreeDlg() : m_wndTree(this, number)
    .    .    .
    .    .    .

[/edit]

prasadbuddhika7-Jan-09 23:05

prasadbuddhika

7-Jan-09 23:05

i,ve an int that should be increased each time the picturebox gets a new picture, what is the event i can use, i tried LoadCompleted but it didn't success.

How to get timer id from onTimer() in WTL

josip cagalj7-Jan-09 22:05

Re: How to get timer id from onTimer() in WTL

7-Jan-09 22:05

Hi,
I'm working on some test app and i need help. I'm using vs2008 wtl. I add an handler for timer functionality and it looks like: MESSAGE_HANDLER(WM_TIMER, OnTimer),
and implementationLRESULT OnTimer(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
Unlike old MSG_WM_TIMER(OnTimer)and implementation void OnTimer ( UINT uTimerID, TIMERPROC pTimerProc )

My question how can I get timer id out from param's in 'new' MESSAGE_HANDLER ontimer f.?
Thanks in advance

Stuart Dootson7-Jan-09 22:48

Re: How to get timer id from onTimer() in WTL

7-Jan-09 22:48

Look at the documentation[^] - wParam == timer ID.

So, uncomment the relevant parameter's name in your implementation and use it. You should have something like this:

LRESULT OnTimer(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/);

or you could even alter the parameter's name to be more descriptive...

LRESULT OnTimer(UINT /*uMsg*/, WPARAM timerID, LPARAM /*lParam*/, BOOL& /*bHandled*/);

josip cagalj7-Jan-09 22:58