C / C++ / MFC

Garth J Lancaster24-May-10 1:35

24-May-10 1:35

from what Ive seen GetActiveObject() is only going to get one instance. If you are looking for a particular instance, you could try looping :-

GetActiveObject()
Is This instance what Im looking for ?
If No CLose the excel instance
repeat until you find the excel instance you want

I was thinking that you could enumerate windows with Excel in the title, somehow close the ones you dont want (assuming you can detect the one you do want by the window title), then do a GetActiveObject()

sorry .. maybe someone else has a better idea

trioum24-May-10 20:05

trioum

24-May-10 20:05

No your idea is failed every time I got the same Excel. And I cannot close the running excel.exe

Trioum

Garth J Lancaster24-May-10 20:07

24-May-10 20:07

well, good luck

Garth J Lancaster24-May-10 20:18

24-May-10 20:18

btw how did you implement either of my ideas ? and

trioum wrote:
And I cannot close the running excel.exe

why not ? obviously if you cant close any excel instance you dont want then you'll never get to the one you do want.. what do you have so many zombie excel instances ?

'g'

trioum24-May-10 20:34

trioum

24-May-10 20:34

I have to work with mulitple excel files not one dude

Trioum

Garth J Lancaster24-May-10 20:51

MFC New Feature pack style problem!

24-May-10 20:51

do you know if GetActiveObject() returns a reference to the Excel instance that 'has focus' or 'is currently active' ?

If that were the case, AND you could distinguish which excel instance was which by the Window title, then you could build a workable solution

a) enumerate all the excel instances and look at their window titles
b) force the instance you want (by window title) to come to the front ie give it focus
c) then do a GetActive Object

somehow I dont think its that easy - the GetActiveObject may have its own way of looking at the ROT or process table, not just the 'active excel instance' - thats confirmed by looking further : MS KB 238975 - http://support.microsoft.com/kb/238975[^]

says "NOTE: If there are multiple instances of an automation server running at the same time, the GetActiveObject() API function returns the IDispatch pointer to the instance that was first running."

So I dont think you're going to be able to do it Frown | :-(

m_code23-May-10 22:21

m_code

23-May-10 22:21

When I use MFC New Feature pack (VC++ 2010) e.g. MFC Property Grid control in my application by adding them directly to resource designer while running the application, MFC new controls appear with no style but the controls Like CButton appear correctly?
What's the problem , please Help

Change Button Image on mouse over

AbhiHcl23-May-10 21:50

AbhiHcl

23-May-10 21:50

Hi

I want to change the image of button on mouse over. When the mouse pinter will be on button it should change the image of the button and once pointer come out from button it should come to its original state. My button havinf owner draw properties and I want to create the button at runtime.
Please provide me some same code

Thanks

Re: Change Button Image on mouse over

namaskaaram23-May-10 23:35

namaskaaram

23-May-10 23:35

Try subclassing..

The below link may help:
Create your own controls - the art of subclassing[^]

cheerio!

How to Convert CString to char array?

TechAvtar23-May-10 19:14

TechAvtar

23-May-10 19:14

I Have a CString which contains port names.

CString cs = "COM1";
char portname[5];

1. What is the memory representation of cs above (I have this question since I think it is multibyte/wide char)?

2. How to copy above cs into portname ? I need portname to contain
{'C','O','M','1','\0'}

Thanks
JC

Yusuf23-May-10 19:28

Yusuf

23-May-10 19:28

Look CString Management[^].

Yusuf
May I help you?

MS_TJ23-May-10 19:43

MS_TJ

23-May-10 19:43

TCHAR path[ MAX_PATH ];
Cstring str;
_tcscpy(path, str);

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer23-May-10 20:56

23-May-10 20:56

1/ The memory representation will change depending on whether the UNICODE define is there or not. The default changes depending on which version of Visual studio you have. VS6, it's char. I think all later ones, it's w_char, or 16bits.

2/ There's a conversion to LPCTSTR operator in the CString class, so you can pass it to const TCHAR * parameters of other functions. So, your question is trivial:

lstrcpy (szBufferOut, sMyString);

Have a look at the following article for more help:
The Complete Guide to C++ Strings, Part I - Win32 Character Encodings[^]

Good luck,

Iain.

I have now moved to Sweden for love (awwww).

How to include a dll and a lib files into a VS project

Aescleal24-May-10 4:17

Aescleal

24-May-10 4:17

Hi,

You've got two problems here:

- Converting from potentially wide to narrow charcaters
- Getting rid of any const

The first means that you can't use something like _tcscpy and TCHARs as you want real, honest, chars, not chars or wchar_ts depending on some preprocessor macro. The second means you've got to do a real copy and you can't just use an implicit conversion.

To solve the second problem you've got to do a copy. To solve the first you either copy the string using wcstombs or strcpy depending on whether the CString is encoded as unicode as not. You can either use the preprocessor to select which function you use, but that's really sucky like most uses of the preprocessor in C++ (avoid it like the plague) or you can use function overloading:

void to_narrow( const CStringA &to_convert, char *out )
{
   ...
}

void to_narrow( const CStringW &to_convert, char *out )
{
   ...
}

I haven't bothered including the code as there's another way you can do the conversion which relies more on the C++ standard library and has less pointers flopping about and confusing the issue. In this version I'm returning a std::vector<char> as it sorts out any memory management for the caller:

std::vector<char> to_narrow( const CStringA &to_convert )
{
    const char *convert_start = to_convert;
    const char *convert_end   = convert_start + to_convert.GetLength() + 1;

    return std::vector<char>( convert_start, convert_end );
}

std::vector<char> to_narrow( const CStringW &to_convert )
{
    const wchar_t *convert_start = to_convert;

    std::vector<char> output( to_convert.GetLength() * 4 + 1 );
    output.resize( wcstombs( &output[ 0 ], to_convert, output.size() ) );
    return output;
}

The supperfluous +1s everywhere are due to CString::GetLength not including the terminating '\0' character in the length. The *4 is just in case Microsoft ever support utf-8 as a character set - it gives the oodles of space for really weird characters

Any questions just shout.

Cheers,

Ash

PS: This code was written from memory and isn't tested, there might be some problems but the idea's sound and in use all over the place.

Splitter Window for MDI.

janaswamy uday23-May-10 16:04

janaswamy uday

23-May-10 16:04

Hi All,

I am trying to get a splitter window for MDI when a Menu Item in Menu is clicked. The splitter window is been created but when i am trying to drag that Splitter it is not able to split also it is not performing the events of the pane. (i.e) if in Pane2 of the splitter i am having a Button Control it is not been handled.

Help me out!

Thanks,
Uday.

Here is the Code.
-----------------

void CMainFrame::OnMytreeTree()
{
CCreateContext ctx;
ctx.m_pNewViewClass = RUNTIME_CLASS(CudayView);
// GetActiveDocument() call before you destroy m_splitter.
ctx.m_pCurrentDoc = GetActiveDocument();
//ASSERT(ctx.m_pCurrentDoc!=NULL);

// m_pSplitter !=NULL when there is a visible splitter.
if (m_pSplitter)
{
// Destroy splitter window.
delete m_pSplitter;
m_pSplitter = NULL;

// Create and initialize CMyView.
SetActiveView((CView*)CreateView(&ctx));
GetActiveView()->OnInitialUpdate();
}
else
{
if(m_pSplitter == NULL)
{
//MDIGetActive()->DestroyWindow();
// Create new splitter window.
m_pSplitter = new CSplitterWnd;
if (!m_pSplitter->CreateStatic(this, 1, 2))
{
TRACE0("Can't create splitter window.\n");
return;
}
else
{
if ((!m_pSplitter->CreateView(0, 0,
RUNTIME_CLASS(CMyTreeView),
CSize(200, 0), &ctx))
||(!m_pSplitter->CreateView(0, 1,
RUNTIME_CLASS(CFirstView),
CSize(500, 0), &ctx)))
{
TRACE0("Can't create one of the splitter panes.\n");
return;
}

// Initialize the two panes (each containing a view
// associated with the current document).
((CView*)m_pSplitter->GetPane(0, 0))->OnInitialUpdate();
((CView*)m_pSplitter->GetPane(0, 1))->OnInitialUpdate();
SetActiveView((CView*)m_pSplitter->GetPane(0, 0));
}
}
}
// Redisplay frame.
RecalcLayout();
}

Schehaider_Aymen23-May-10 11:18

Schehaider_Aymen

23-May-10 11:18

Hello everybody.

I'm trying to use OCILIB driver for oracle under Mvisual studio 6 and i need some help to accomplish some duties.

in my work i need to include a lib file a dll file and a header file; like
. oclib.h
. ociliba.dll
. ociliba.lib

to include the header file, i put the file under "C:\Program Files\Microsoft Visual Studio\VC98\Include"

the question is: how could i use the dll and the lib files in my project (i'm using visual studio 6) Unsure | :~

it's a kind of an easy task but i never tried to include dll or lib files into my projects.

Thank you very much Hmmm | :|

"The Ultimate Limit Is Only Your Imagination."

Re: How to include a dll and a lib files into a VS project

Garth J Lancaster23-May-10 12:36

Re: How to include a dll and a lib files into a VS project [modified]

23-May-10 12:36

One way is like this - its suitable for small projects I guess :-

a) go to Project Settings (ALT F7)
b) Select The Link Tab
c) Set Category to Input
d) In the Object/library modules box, put oci.lib and a space after it - put it at the front for now unless there is a 'collision' in the build/link stage
e) In the Additional Library Path box, enter in the path to the .lib module

Obviously you include the ocilib.h file with a #include "ocilib.h" ... not sure If I agree with where you put it .. I usually put 3rd party modules in a '3rdParty' Folder

Projects
   \3rdParty
      \bin      <- Libs, dlls
      \inc      <- Headers

In your case they are probably under the Ora92 (or whatever version) directory - they could be left there

To Pick up the headers from the structure above or where you have them, you could :-

a) go to (again,under project setting) C++ Tab,
b) Select Category 'Preprocessor'
c) Put the directory ie drive:\Projects\3rdParty\inc in the additional include directories

You can also change (independantly) the settings or ALL projects, by going Tools -> Options -> Directories, and using the 'Show Directories For' dropdown and adding the directories for include files, library files etc - some people prefer this approach.

For larger projects, I tend to use a modified version of the 1st approach, but I allow for different versions of components by using environment settings (that means I dont need to change the basic build within a project), but see if you can get going in 'simple mode' first

hope this helps

'g'

Schehaider_Aymen23-May-10 12:43

Schehaider_Aymen

23-May-10 12:43

Thx for the answer.

it works now. thx you verry much for this help. Thumbs Up | :thumbsup:

"The Ultimate Limit Is Only Your Imagination."

modified on Sunday, May 23, 2010 6:54 PM

Re: How to include a dll and a lib files into a VS project

Garth J Lancaster23-May-10 12:56

Re: How to include a dll and a lib files into a VS project

23-May-10 12:56

not sure where thats coming from, and Im sure you'll appreciate, trying to debug something like this remotely is hard

- have you started a new project from scratch or are you extending something else you've found ?
- have you just installed MSVC and proved it can compile a simple 'hello world' ?

What kind of project are you attempting to create - console, gui/MFC, Dialog box - not that it should make too much of a difference

If you're a rank beginner, I do feel your pain, and yes, it is hard to find your way around .. I often find the safest way to start with a new API for example is to build myself a little console test harness - start with a console 'hello world' program, build that, then start adding eg the oci stuff to it it.. when thats done and working, then think about applying that knowledge to something bigger/the main project .. that way if something goes wrong, you always have your test harness to refer to - its not quite 'unit testing' but a good start

Its been a long time since Ive worked with oci (and never 'directly') - tell me about what you're trying to do and I might be able to suggest an approach

'g'

Schehaider_Aymen23-May-10 12:57

Schehaider_Aymen

23-May-10 12:57

for that error it was the " that i added to the path when including the lib. now it's gone when i erase it Wink | ;)

For the oci, i m trying to put on screen the data from an Oracle DB using C++ and this to integrate it into a larger team work. so my part is to begin with the ocilib driver.

"The Ultimate Limit Is Only Your Imagination."

Starting a password protected NT Service [modified]

pubis23-May-10 9:13

pubis

23-May-10 9:13

Hi, I am a C++ beginner. I have an NT Service I need to publish on the net for download but I don't want any one to be able to start except me or the one I authorize. When you download the service executable you could install the service but you should not be able to start it. One of the ideas is to protect the service executable with password, this way, in theory, only the one who has the password can start the service. Lots of EXE Password protectors on the net, but once I use one of them to protect the service executable the service doesn't start at all. The reason is obvious; NT services has no message pipe a user could use to enter the password. I even used Themida to protect the service as described on their KB (they say their software can protect NT Services) but looks like Themida actually corrupts the service executable too as it doesn't start anymore. I have the source code of the service and I use [service /i] and [service /u] to install/uninstall the service, but I don't know how to pass the password as a command line parameter to the service when I start it. the SCM attempt to start it.

If the password protecting is a bad idea, could some one guide me on how to reach my goal, my goal is: my service should not be started by anyone except me.

Thanks

modified on Sunday, May 23, 2010 3:52 PM

Aescleal23-May-10 9:59

Aescleal

23-May-10 9:59

Hi,

Not sure if this helps as an idea, but if you decouple the concepts of "service start" and "service can do something useful" you might find another way into the problem.

So when the service first starts up it just sits there, doing nothing. It rejects all requests over it's external interface (over RPC, TCP, shared memory) until something comes along and tells it to activate. The thing that tells it to activate is another, fairly small, application that's password protected. Only the person that knows the magic mantra to get the activation process running (i.e. it's password) can switch the service from dormant to active.

There are some problems with this approach:

- Securing the link between the thing doing the activation and the service. Quite how you sort the trust out to stop some bad guy reverse engineering your protocol could be an interesting challenge.

- if the service has to do something before the first interactive user logs in then this won't work. Sorry, back to the drawing board!

Hope this provides some food for thought,

Cheers,

Ash

pubis23-May-10 10:15

pubis

23-May-10 10:15

Delicious food Ash, thanks, but unfortunately, my service should do the hard job before user logon, which means it should rely on itself on the matter of being active/inactive.
from your post I understand that a service password protecting is not good, but I need to know; is it possible? The guys at Oreans say that it's possible and their product could do it without even having the source code of the service but it doesn't work! any ideas? thanks

Aescleal23-May-10 10:24

Aescleal

23-May-10 10:24

Oh well, forget my post then Smile | :)

I have no idea why your third party product doesn't work. I'd wave the prospect of an order at them and see if that makes them sort out your problem, it often works for me!

Cheers,

Ash