Re: modeless dialog box - C / C++ / MFC Discussion Boards

Re: My complex polymorphic inheritance problem.. Its like a puzzle !!! can u solve ??

quakeboy2-Nov-07 2:03

2-Nov-07 2:03

Hi thank you very much for replying.

I have corrected the problem. (Just inverted the triangles)

What I gave in the UML Diagram is just a kinda semi-pseudocode...
The program compiles and excecuted with no errors...

I am trying to develop a CAD Application with some complex relationships between the shapes
with GOF Observer - Notify pattern for maintaining the relationships

What I gave there is only the class structure where i have problems.

Please tell me why those two pointers are not holding the same address?

Re: My complex polymorphic inheritance problem.. Its like a puzzle !!! can u solve ??

TClarke2-Nov-07 3:56

TClarke

2-Nov-07 3:56

Firstly just a small correction:
In the program section the first line is as follows

c1 *myc1 = new myc1();

That certainly did not compile.

c1 *myc1 = new c1();

will.

In the method update you have the line:

if(tmp==b1)

did you mean:

if(tmp==obj)

Also why the use of the word function if this is C++?

When you instantiate Rel you cast a c1 pointer to a b1 pointer.
When you call f1();
you pass in a this pointer from within a2 in to the update method in the Rel class.
You then cast that pointer to a b1 pointer and compare to see if they are the same pointer.
If they are you call the success method.
So basically you're casting a c1* to a b1*, no problem there.
and casting an a1* to a b1*

I'm curious, how are you maintaining a pointer to Rel in a2 when Rel contains a pointer to a b1, a subclass of a2?

Cheers
Tom

Philosophy: The art of never getting beyond the concept of life.

Religion: Morality taking credit for the work of luck.

"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane."
- Marcus Aurelius

Re: My complex polymorphic inheritance problem.. Its like a puzzle !!! can u solve ??

led mike2-Nov-07 4:42

led mike

2-Nov-07 4:42

Ah a multiple inheritance problem. Unless only one of the base classes has data members ( so the others are all interfaces ), it should not be done unless as a last resort.

Together with your Rel method update(void*) you appear to have a design problem. void* is untyped and therefore indicative of design flaws.

No doubt there are one or more bugs that could be fixed, but poor design can manufacture complexity and increase the risk of bugs, difficult bugs.

Not getting process details (process name, process path) for some processes

Subhash Karemore2-Nov-07 1:34

Subhash Karemore

2-Nov-07 1:34

Hi All,

I m not getting process details (process name, process path) for some processes. for example, I m not getting process details for 3 svchost.exe out 5 svchost.exe. I m getting proper details for 2 svchost.exe.

Thanx,
Subhash

Re: Not getting process details (process name, process path) for some processes

David Crow2-Nov-07 2:52

David Crow

2-Nov-07 2:52

Subhash Karemore wrote:
I m not getting process details...

Using what? Do you have the Debug privilege (i.e., SeDebugPrivilege) enabled?

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modeless dialog box

AnayKulkarni2-Nov-07 0:21

AnayKulkarni

2-Nov-07 0:21

Hello to all,
i am creating one modeless dialog box whose id is "IDD_DIALOG_TEST" and i have placed some static text "Hello codeproject" on that dialog box. I am invoking that dialog box through "Create" method and showing it through "ShowWindow(SW_SHOWNORMAL)" method, after some time when i will call "DestroyWindow()" method the dialog box will get destroyed, now the problem is that dialog box is getting invoked and displayed properly but the static text on it is not getting displayed means i can see only dialog box but not the static text on it, what can be the reason, can anybody help me plz?

Thanks and Regards,

Anay

Re: modeless dialog box

toxcct2-Nov-07 0:24

toxcct

2-Nov-07 0:24

is this[^] article of any help ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: modeless dialog box

ThatsAlok2-Nov-07 3:05

ThatsAlok

2-Nov-07 3:05

AnayKulkarni wrote:
have placed some static text "Hello codeproject" on that dialog box.

how are you placing the Static text on the dialog. i.e. are you using SetWindowText or included that in Resource file or giving value to any variable to display the static text at startup

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
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Re: modeless dialog box

Peter Weyzen2-Nov-07 8:30

Peter Weyzen

2-Nov-07 8:30

How are you calling this update function on the dialog? Are you in a UI thread? If not, you can run into problems...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
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Staff Engineer<br />
<A HREF="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</A>

How can we get pictures in Mainframe

saravana0012-Nov-07 0:21

saravana001

2-Nov-07 0:21

Hi all,
how to add pictures to the mainframe as my mainframe is opening with nothing in it.can any one plz tell me clearly about this,,,

thanks in advance,
Saravana...

Re: How can we get pictures in Mainframe

ThatsAlok2-Nov-07 3:11

ThatsAlok

2-Nov-07 3:11

saravana001 wrote:
how to add pictures to the mainframe as my mainframe is opening with nothing in it.can any one plz tell me clearly about this,,,

how are putting you image in MainFrame Window, i.e. View Window. have you overidden the OnDraw function for drawing image on View Window. you can use this class for display variety of image format on windows http://www.codeproject.com/bitmap/extendedbitmap2.asp[^]

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: How can we get pictures in Mainframe

Iain Clarke, Warrior Programmer2-Nov-07 4:28

Iain Clarke, Warrior Programmer

2-Nov-07 4:28

I have an MDI app - and I wanted a less boring backdrop. The trick is to subclass the MDI Frame window - and then override WM_ERASEBKGND.

The below code uses CSubclassWnd by Paul DiLascia - you should be able to search for in from an old MSJ article on the web.

Good luck,

Iain.

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CMDIFrameWnd::OnCreate(lpCreateStruct) == -1)
	return -1;
    m_Backdrop.Install (m_hWndMDIClient, IDB_MIDAS, 32);
    ....
    return 0;
}


class CUIMDIBackdrop : public CSubclassWnd
{
public:
	CUIMDIBackdrop ();
	~CUIMDIBackdrop ();
	BOOL	Install (HWND hWndMDIClient, UINT idBitmap, int nMargin);

protected:
	virtual LRESULT WindowProc(UINT msg, WPARAM wp, LPARAM lp);
};

CUIMDIBackdrop::CUIMDIBackdrop ()
{
}

CUIMDIBackdrop::~CUIMDIBackdrop ()
{
}

BOOL CUIMDIBackdrop::Install (HWND hWndMDIClient, UINT idBitmap, int nMargin)
{
    // load resources and other graphics stuff here
    return HookWindow (hWndMDIClient);
}

LRESULT CUIMDIBackdrop::WindowProc(UINT msg, WPARAM wp, LPARAM lp)
{
	if (msg != WM_ERASEBKGND)
		return CSubclassWnd::WindowProc(msg, wp, lp);

	HDC hDC = (HDC) wp;
	CDC *pDC = CDC::FromHandle (hDC);

	CRect rc;
	::GetClientRect (m_hWnd, &rc);

    // do pretty stuff here
	return TRUE;
}

Resume a suspend process

inovah2-Nov-07 0:18

inovah

2-Nov-07 0:18

Hi all,

I have an application that create a process in suspend mode:

CreateProcess(filePath, 0, 0, 0, TRUE, CREATE_SUSPENDED, 0, 0, &startup, &procinfo);

and then later in code, we will run the program... so do a resume

ResumeThread(procinfo.hThread);

the problem I have is that the windows of the launched program does not appear. For example, if the create process is notepad.exe, when I resume the thread, the window of notepad does not appear and even not in the taskbar.

What is wrong with my approach?

thanks

InovaH

Re: Resume a suspend process

toxcct2-Nov-07 0:20

toxcct

2-Nov-07 0:20

send it a WM_RESTORE or WM_MAXIMIZE...

BTW, what are you trying to achieve here ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: Resume a suspend process

inovah2-Nov-07 3:17

inovah

2-Nov-07 3:17

How do I send it?
Trought the SendMessage() ? (If so, how to get hwnd)

or with startup.wShowWindow = SW_MINIMIZE; ?

I try to create a process of user's choice in suspend mode to analyse program and inject a monitor DLL. Then process is resumed so that program is used by user.

InovaH

Re: Resume a suspend process

David Crow2-Nov-07 2:54

David Crow

2-Nov-07 2:54

How are you initializing the startup structure?

Re: Resume a suspend process

inovah2-Nov-07 5:22

inovah

2-Nov-07 5:22

Here is the initialization:

STARTUPINFO startup;
GetStartupInfo(&startup);

memset (&procinfo, 0, sizeof (PROCESS_INFORMATION));
memset (&startup, 0, sizeof (STARTUPINFO));
startup.cb = sizeof(&startup);

//start process in SUSPEND mode
CreateProcess(filePath, 0, 0, 0, TRUE, CREATE_SUSPENDED, 0, 0, &startup, &procinfo);

CU

Re: Resume a suspend process

David Crow2-Nov-07 5:29

David Crow

2-Nov-07 5:29

Shouldn't you be assigning a value, other than 0, to the wShowWindow member?

Dialog ID comparision

KASR12-Nov-07 0:04

KASR1

2-Nov-07 0:04

What is the difference between the following two statements?

1. if ((nID & 0xFFF0) == IDM_ABOUTBOX)
2. if ( nID == IDM_ABOUTBOX)

Re: Dialog ID comparision

toxcct2-Nov-07 0:15

toxcct

2-Nov-07 0:15

by doing nID & 0xFFF0, you're forcing the lower significant bytes to 0.

read this article[^] to understand the & operator better.

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: Dialog ID comparision

David Crow2-Nov-07 3:00

David Crow

2-Nov-07 3:00

Sakthi_Vel wrote:
1. if ((nID & 0xFFF0) == IDM_ABOUTBOX)

This only looks at the three most significant (upper) bytes, and then compares the result to IDM_ABOUTBOX.

Re: Dialog ID comparision

Michael Schubert2-Nov-07 6:56

Michael Schubert

2-Nov-07 6:56

DavidCrow wrote:
This only looks at the three most significant (upper) bytes

Have to disagree, 0xFFF0 only represents 2 bytes or 16 bits, how can the expression look at three bytes? The expression nID & 0xFFF0 ignores only the lower 4 bits of nID.

About Date

manish.patel1-Nov-07 23:57

manish.patel

1-Nov-07 23:57

Hello All,

how to get Current System Date in Long?

Any Help?

Manish Patel

Re: About Date

Matthew Faithfull2-Nov-07 1:47

Matthew Faithfull

2-Nov-07 1:47

The last Long equivalent Date type I heard of was in VB6, these days you'll probably need to do your own conversion or put up with storing at least 8 bytes. Have a look at the GetSystemTime and SystemTimeToFileTime API calls and their associated structures. A conversion to something like

<br />
struct LongDate<br />
{<br />
  WORD Year;//AD year - 1600<br />
  WORD DayNumber;//1-365<br />
};<br />

would be pretty trivial and you could shoe-horn that into a long.

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: About Date

David Crow2-Nov-07 3:01

David Crow

2-Nov-07 3:01

Manish_mnp wrote:
how to get Current System Date in Long?

Use the time() function.

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