C++ objects in global memory... - C / C++ / MFC Discussion Boards

How to get the y coordinate of a PolyBezier spline

1-Feb-02 3:56

Hello,

I'd like to know if you know how to get the y coordinate of PolyBezier spline (giving the x one).

Thanks

addObject()

1-Feb-02 3:42

I need to know how do i write a method that should add one objetc to some array everytime it is called.
thanks
Confused | :confused:

Re: addObject()

Jon Hulatt1-Feb-02 4:09

Jon Hulatt

1-Feb-02 4:09

If you're using MFC, then you could use CObArray. Or one of it's derived classes ( CStringArray, CPtrArray, CByteArray, CWordArray, CDWordArray).

They're pretty funky and already do exactly what you want.

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Problem with menu/activex control event

Roger Allen1-Feb-02 3:28

Roger Allen

1-Feb-02 3:28

I have an ActiveX control which fires an event. In the event handling code in the containing app, I create and display a pop-up menu. If I click anywhere outside of the menu, it gets dismissed as expected, but the application stays stuck in the menu modal loop until I get the menu to display again by again firing the event from the control (by clicking the control again).

Whats going on?

And more importantly, do you have any idea on how to fix it?

Roger Allen
Sonork 100.10016

If I'm not breathing, I'm either dead or holding my breath.
A fool jabbers, while a wise man listens. But is he so wise to listen to the fool?
Please step to the rear of the car and make room for more victims. - John Simmons the Outlaw programmer, 1st Feb 2002, in the lounge

Re: Problem with menu/activex control event

Joaquín M López Muñoz1-Feb-02 3:37

Joaquín M López Muñoz

1-Feb-02 3:37

This is just guessing, but could it be that you haven't specified correctly the parent window in TrackPopupMenu?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Problem with menu/activex control event

Roger Allen1-Feb-02 4:38

Roger Allen

1-Feb-02 4:38

Thanks for the tip, but the correct window is the parent. Frown | :(

Roger Allen
Sonork 100.10016

If I'm not breathing, I'm either dead or holding my breath.
A fool jabbers, while a wise man listens. But is he so wise to listen to the fool?
Please step to the rear of the car and make room for more victims. - John Simmons the Outlaw programmer, 1st Feb 2002, in the lounge

Re: Problem with menu/activex control event

Joaquín M López Muñoz1-Feb-02 5:33

Joaquín M López Muñoz

1-Feb-02 5:33

Another guess: maybe your event handler is being called from a different thread than your main window belongs. A possible fix could be that the event handler sends a user message to the main window (say WM_HANDLE_EVENT) and then doing the popup menu stuff in OnHandleEvent (which executes in the right thread). Maybe it's worth a try.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

C++ objects in global memory...

C^hris L^osinger1-Feb-02 2:26

C^hris L^osinger

1-Feb-02 2:26

I need to export C++ objects out of a DLL. The objects don't have to be used outside of the DLL, they just have to be able to be passed back in to the DLL for use inside - essentially, they are containers for the DLL's state.

These objects would never be shared between threads or processes.

I was thinking this might be a way to do it:

typedef HGLOBAL HMYOBJ;

// exported DLL function
HMYOBJ GetDLLObject()
{
  HGLOBAL hObj = GlobalAlloc(GPTR, sizeof(CMyClass));

  // initialize it
  CMyClass *pClass = (CMyClass *)hObj;
  pClass->Init();

  return (HMYOBJ)hObj;
}

...

// another exported function
BOOL UseDLLObject(HMYOBJ hObj)
{
  CMyClass *pClass = (CMyClass *)hObj;
  return pClass->DoSomething();
}

void DestroyDLLObject(HMYOBJ hObj)
{
  CMyClass *pClass = (CMyClass *)hObj;
  pClass->CleanUp();
  GlobalFree(hObj);
}
...

// here's how the caller would use the DLL
HMYOBJ hObj = GetDLLObject();
BOOL ok = UseDLLObject(hObj);
DestroyDLLObject(hObj);

Does that seem reasonable? It does seem to work, I just wanted someone else to look at it.

-c

Smaller Animals Software, Inc.

Re: C++ objects in global memory...

Joaquín M López Muñoz1-Feb-02 3:05

Joaquín M López Muñoz

1-Feb-02 3:05

Does that seem reasonable?

It looks very reasonable to me except for one thing. IMHO instead of

HGLOBAL hObj = GlobalAlloc(GPTR, sizeof(CMyClass));
CMyClass *pClass = (CMyClass *)hObj;
pClass->Init();
return (HMYOBJ)hObj;

it's simpler to write

CMyClass *pClass = new CMyClass(); // init stuff in the ctor
return (HMYOBJ)pClass;

which works just the same.

If you want to take extra precautions to make sure that the object passed back from the user app is a valid pointer, you can have an internal table of pointers and pass an index to that table, instead of the actual pointer --that's how Win32 does it most of the time.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Winsock2

31-Jan-02 23:43

Dear all,

Would you please help me with subj. I want to send defenite packet by means of Winsock2, and destination is MAC address not IP address. But I haven't found how I can do that by using WS2. Is it possible to resolve this prolem? Confused | :confused:

And if it possible to do in this way, could you ask to me, how I can create packet with required to me structure.

Thanx in advance

RomaDo

Re: Winsock2

Peter Weyzen1-Feb-02 12:41

Peter Weyzen

1-Feb-02 12:41

I don't think you can do that.

The IP network that you are transmitting traffic, uses the IP address to route the traffic. If there's no IP address, it won't know where to go.

Regards
-p

Re: Winsock2

2-Feb-02 23:02

Yeah I gave inaccurate information. I would like to send packet on the mannear of ARP protocol, which would turn on computer in my internal network (192.168....). Simply to say i want to use Wake-up on LAN function. Is it possible to do with VC++ tools and in particularly with using WSock 2?

Thanx for your time

Downloading and booting WinCE on a LapTop

Gert Boddaert31-Jan-02 23:14

Gert Boddaert

31-Jan-02 23:14

In Platform builder (3.0), I created a CEPC based WinCE OS which I want to download on a Laptop (Toshiba Tecra 8000) by using the parallel port since the laptop does not have the required CE-Debug compatible ethernet card. the "loadcepc.exe" programs always fails with:

"
Sending boot packet: aa
WaitForStatus: PPSH Disconnected
"

I am able to start a release build of the WinCE OS (Kernel debugging disabled) after I copied the nk.bin file over to the target.
However a debug build always resets the machine.

Is there something wrong (not standard) with the parallel port of the Laptop?

Hints and tips receive a warm welcome.

BR,

Gert.

--------------------------------------------------
If my messages appear curt, I apologize.
I try to be brief to save your time as well as mine.
--------------------------------------------------

Re: Downloading and booting WinCE on a LapTop

Gert Boddaert1-Feb-02 5:45

Gert Boddaert

1-Feb-02 5:45

never mind, I just figured out I need a special parallel cable, which my collegue manufactured while burning his fingers with the solder...

--------------------------------------------------
If my messages appear curt, I apologize.
I try to be brief to save your time as well as mine.
--------------------------------------------------

pItem->CreateNewItem(clsid); and Ms Word

Braulio Dez31-Jan-02 23:09

Braulio Dez

31-Jan-02 23:09

Hi,

I´m running and Ms Word instance in-place, but if I fail to create it ( for example when there is one instance of Ms Word running but unstable), it shows an ugly exception message from word ( then If the user presses ok, my program will continue and it will create the embedded solution), that message is shown in:

pItem->CreateNewItem(clsid);

Is there anyway to avoid that the message is shown to the user ?

Thanks, Bye !
Braulio

OLE automation how does it work???

Gérald Mercet31-Jan-02 22:18

Gérald Mercet

31-Jan-02 22:18

I would like to create a sort of library of method in vc++ to be used in excel. So i believe that if i create a .dll application instead of a .exe, i would be better. But i have read that i could use especially OLE Automation for that kind of application. I have read in msdn the comexcel sample, but it's not really what i want to do.

In fact, i would like that the methods defined in first in vc++ could be used in excel as we could to simply when we create functions in vba. So how we could do that? Where could i find samples?

thanks in advance for your answers.

gerald

Re: OLE automation how does it work???

Braulio Dez31-Jan-02 23:19

Braulio Dez

31-Jan-02 23:19

Hi,

A very good doc is: "Automating Microsoft Office 97 and Office 2000" ( written by Lori Turner , 17 February 2000), it´s free you can search for it in MSDN in the web or the cd.

You can find a lot of help in MSDN, just search for this keywords:

kbAutomation kbExcel kbMFC sample

But anyway you are right most of the samples are made for VBasic, but it´s easy to transform it to VC code.

About docs explaining more on Word Automation:

http://www.codeproject.com/com/xoffice.asp

and in codeguru ( www.codeguru.com) you can find some help as well.

Some more samples you can find in the Kruglinski, Shepher, Wingo book "Inside Visual C++".

And one more tip... sometimes the easiest way to find how to implement something for Excel or Word is just to record a macro and see the code generated in VBA.

Good Luck
Braulio

CArchive and CompoundFile

wangyiming31-Jan-02 22:04

wangyiming

31-Jan-02 22:04

the Document is a CompoundFile ( include: ole, image file, ... )
-----------------------------------------------------------
I can open or save Document( 1: CMyDoc::Serialize)
but how can I load file to CMfSet Directly ( 2: CMfSet::Open )

1. -----------------------------------------
void CMyDoc::Serialize(CArchive& ar)
{
// m_curMfSet is member var of CMyDoc : ( CMfSet m_curMfSet; )

m_curMfSet.Serialize(ar);
COleDocument::Serialize(ar);
...
};

2. -----------------------------------------
class CMfSet : public CObject
{
DECLARE_SERIAL(CMfSet)
public: // consturct or disconturct
CMfSet();
~CMfSet();

public:
BOOL Open(LPCTSTR lpszFilename);
// ...
};

BOOL CMfSet::Open(LPCTSTR lpszFilename)
{
CFile f;
if( !f.Open( lpszFilename, CFile::modeRead) )
return FALSE;

TRY
{
char buf[4096];
CArchive ar(&f, CArchive::load, 4096, buf);
Serialize(ar);
// It is sure error, but I don't know how correct it
}
CATCH_ALL(e)
{
return FALSE;
}
END_CATCH_ALL

return TRUE;
};

Thank you!

Re: CArchive and CompoundFile

wangyiming1-Feb-02 15:11

wangyiming

1-Feb-02 15:11

I had solved it:

CRuntimeClass *pRuntimeClass = RUNTIME_CLASS(CMyDoc);
CMyDoc *pDoc = (CMyDoc *)(pRuntimeClass->CreateObject());
if( pDoc->OpenDocument(lpszFilename) )
pSet->FromOther( pDoc->GetMfSet() );
delete pDoc;
...

------------------------------------------------------
any advance soultion?( if you have time, please tell me the answer)
Thank you!

trouble

31-Jan-02 21:31

is there anybody who ever get this trouble ?

look:
(if u want to see the question directly ,or
save ur time plz go to the end of the thread!)

i create 2 dialogbars in my SDI app. each dialogbar
has a class (i.e. CMyDialogBar1,CMyDialogBar2) ,
and i add 10 buttons in both of the 2 dialogbars.

firstly, i implement one of them.(segment of mainfrm.cpp)

"mainfrm.h"
//////////////////
CMyDialogbar1 m_b1;
CMyDialogbar2 m_b2;
//////////////////

"mainfrm.cpp"
//////////////////
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (!m_b1.Create(......))
{
......
}

if (!m_b2.Create(......))
{
......
}

}
//////////////////

**** 0 error after press F7 ! and the 2 dialogbars are all right!

secondly, in "CMyDialogBar1.cpp" ,i init all button in dialogbar1
like this:

//////////////////
BOOL CMyDialogBar1::InitButtons()
{
int i;

for(i=0; i<button_number; i++)
="" {
="" m_btn[i].mydrawbuttonfacefunction(i);
="" m_btn[]="" is="" a="" instance="" of="" cmybutton="" class=""
="" deriving="" from="" cbutton="" class,but="" cmybutton
="" can="" change="" the="" color="" button
="" m_btn[i].subclassdlgitem(idc_bar1_btn1+i,="" this);
="" }
="" return="" true;
}
=""
all="" these="" buttons="" in="" cmydialogbar1="" are="" set="" to="" ownerdraw="" style="" ,="" and="" i=""
make="" drawitem()="" function=""

****="" 0="" error="" after="" press="" f7="" dialogbar1="" got
="" different="" each

now,="" am="" going="" implement="" button="" on="" second="" dialogbar.
="" then="" trouble="" comes="" out.

i="" add="" such="" message="" handle="" "mainfrm.cpp"
i="" place="" code=""
in="" "mainfrm.cpp"="" ,(here="" segment)
=""
begin_message_map(cmainframe,="" cframewnd)
="" on_command_ex_range(idc_bar2_btn1,idc_bar2_btn10,onbar2lbtn)
end_message_map()
=""

in="" “mainfrm.h”
="" {{afx_msg(cmainframe)
="" afx_msg="" void="" onbar2btn(uint="" btnid);
="" }}afx_msg
=""

all="" implemented="" ,but="" some="" we="" create="" first="" disabled="" !="" why="" ??
when="" remove="" implementing="" dialogbar(dialogbar2),="" 1st="" dialogbar(dialogbar1)="" enabled.="" cant="" figure="" out="" what="" worng.="" maybe="" make="" mistakes="" using="">=2 dialogbars in a program in one time.but some of the buttons in dialogbar2 are still work. only a part of them are disabled ! why ?

can anybody tell me why? thanks in advance!
of if u have some code of using >=2 dialogbars in a program,
can u email me ?

eMial: litterjosser@hotmail.com

nickong

let's talk about code or some funny video

Re: trouble

Johan Rosengren22-Jun-04 8:42

Johan Rosengren

22-Jun-04 8:42

You have replaced the creation parameters of the bars - perhaps you have the same ids for the two of them?

does Windows registry record the bootup and shutdown time?

DengJW31-Jan-02 21:01

DengJW

31-Jan-02 21:01

Where and how to retrieve the infomation?

Thanks

DJ

STL - Newbie...

Bernhard31-Jan-02 20:34

Bernhard

31-Jan-02 20:34

Hi..

i've started using the stl and i am really amazed.. i really like the library.. the most important part for me are the sorting algorithms and stuff like that..
the problem i don't get started seems pretty simple:

i would like to write a functor that takes a second parameter.. and the problem ist that this paramter should be sthing like a const char*..
e.g. i want to copy all the members, where one member var has got a given value.. and this value is a const char* (or a std::string.. no cstrings please)..

could anyone help me?

// sthing like this.. but i would like to compare strings..)
find_if(L.begin(), L.end(), bind2nd(greater<int>(), 0));

thanks in advance
bernhard

Sometimes I think the surest sign for intelligent life elsewhere in
the universe is that none of them ever tried to contact us.

Re: STL - Newbie...

Joaquín M López Muñoz31-Jan-02 23:41

Joaquín M López Muñoz

31-Jan-02 23:41

You'd do it the same way for strings:

list<string> L;
...
find_if(L.begin(), L.end(), bind2nd(greater<string>(), "hello dude"));

Here the comparisons are lexicographical.
That's the great thing about STL: genericity!!

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: STL - Newbie...

Bernhard31-Jan-02 23:51

Bernhard

31-Jan-02 23:51

well.. thank you for this.. but my real problem is as follows..
i mostly use containers of classes.. and so i am writing functions to compare them (i hardly ever use stuff like greater)
and how do i achieve this..
my fun's look mostly like:

bool rmore (const Class* &l, const Class* &r)
{
	return (l->x > r->x);
}

i wanted to write sthing like

bool rlikestring (const Class* &c, string s)
{
  return (c_membervar = s);
}

does this work this way? (it would be pretty cool for algorithms like remove_if)

thanks for your answer
bernhard

Sometimes I think the surest sign for intelligent life elsewhere in
the universe is that none of them ever tried to contact us.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.