C / C++ / MFC

Michael P Butler29-Jul-02 10:39

Michael P Butler

29-Jul-02 10:39

It doesn't make a lot of sense but firstly,

ts74 wrote:
CSlsuTable* pSLSU = new CSlsuTable(pDatabase); //CSlsuTable is my struct
ASSERT(pSLSU);
if (pSLSU)
if (BadFileTest(pSLSU,"su_key='I_CALC30'","slsu",pDatabase))

pSLSU is a CSlsuTable class but your function defintion uses struct cTableSet. This should be CSlsuTable* not struct cTableSet;

What are you actually trying to achieve, because what you've said and your code don't tally.

Michael Smile | :)

Time flies like an arrow. Fruit flies like a banana

Todd Smith29-Jul-02 11:45

Todd Smith

29-Jul-02 11:45

It sounds like you want to select the appropriate structure based on your database query. That can easily be done with a virtual base class.

I think you need an Abstract Factory Pattern. Try a google search.

Todd Smith

Joaquín M López Muñoz29-Jul-02 11:55

Joaquín M López Muñoz

29-Jul-02 11:55

I think the exact pattern the guy needs here is a Factory Method, which is similar to, but not the same as, Abstract Factory.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

oscar_r30-Jul-02 2:48

oscar_r

30-Jul-02 2:48

What I am trying to do is simplify my program, I have a function in which I verify my tables are verified, the problem is that each table has it's own structure. I wanted to setup a new function where I could pass the structure value so I could validate my tables in one simple process instead of going thru this the long way (copy/paste). So I was trying to figure out a way to pass the structure along to a function, so I could play with it in my new verify function, and this is where I ran into problems... Confused | :confused:

how to access C..Doc var. from any class ?

perlmunger30-Jul-02 10:56

perlmunger

30-Jul-02 10:56

This is a confusing discussion because I'm not sure that everyone knows what you understand and don't understand here ( you said you're new to VC++, so I don't intend this as an insult. Just trying to get to the core of the trouble ).

If you are having trouble understanding passing by value versus passing by reference, I'd be glad to explain it. It's pretty easy once you see what's going on.

If what you want is the ability to pass a structure (you should be using classes, by the way) that may have different member variables, then you probably need to understand virtual inheritance (which someone else mentioned) which gives you the ability to pass different inherited structures (classes) to the same function assuming they all have the same parent. I can explain this in more detail if you should desire as well.

Let me know and I'll try to help.

-Matt

------------------------------------------

The 3 great virtues of a programmer:
Laziness, Impatience, and Hubris.
--Larry Wall

Tooltips on a CToolbar

Gilfrog29-Jul-02 10:10

Gilfrog

29-Jul-02 10:10

I am having trouble getting the tooltips to come up for on a toolbar. The toolbar is on a dialog. I create the toolbar like, with the CBRS_TOOLTIPS flag.

if(!m_wndToolBar.Create(this, WS_CHILD|WS_VISIBLE|CBRS_TOP|CBRS_TOOLTIPS) || !m_wndToolBar.LoadToolBar(IDR_TOOL_BAR))
ASSERT(FALSE);

I then handle the message

ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTW, 0, 0xFFFF, OnToolTipNotify)
ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF, OnToolTipNotify)

The OnToolTipNotify function looks like

BOOL CApply::OnToolTipNotify( UINT id, NMHDR * pNMHDR, LRESULT * pResult )
{
TOOLTIPTEXT *pTTT = (TOOLTIPTEXT *)pNMHDR;
UINT nID =pNMHDR->idFrom;
strcpy(pTTT->szText, "Click Here - Test");

return TRUE;
}

It comes to the OnToolTipNotify but when the tooltip pops up it gives me a bunch of boxes and junk with no text.

Can anybody see something wrong?

Thanks

Fred D.29-Jul-02 9:54

Fred D.

29-Jul-02 9:54

hi all,

does anybody know a way to access to C..Doc (or C..View) variables from ANY class in a project ?

I've tried :

// in a constructor of another class
CMtsBaseDoc* pDocument = ((CMtsBaseView*)(AfxGetApp()->m_pMainWnd))->pDoc;

// and even this one..

CMtsBaseApp* pApp = (CMtsBaseApp*)AfxGetApp();<br />
CMtsBaseDoc* pDocument = (pApp->GetMyView())->pDoc;    // using GetMyView() from one article in codeproject<br />

but nothing ! I just cannot get the right @ for my pDocument !? 'cos pDoc and pDocument should have the same @... and i get 2 different @

any help

thanx
Fred

Hydralisk29-Jul-02 16:47

Hydralisk

29-Jul-02 16:47

CTtDoc *pDoc=(CTtDoc *)((CMainFrame *)AfxGetApp()->m_pMainWnd)->GetActiveDocument();

JennyP29-Jul-02 19:10

29-Jul-02 19:10

Hello,

I tried using this in a DialogBar function to point back to the Document function to get some UINT values.

When calling the function from the Document, it works fine.

However, when calling it from the DialogBar using the pDoc pointer, the Document function cannot access any of the Document's members--even the debugger cannot "evaluate" the member variables. Both function and members are public in my case.

So it appears that this pointer is not a full-feature pointer....? I'm interested both in a solution to get Document function (data) from 'remote' classes such as my DialogBar AND (academically) what is going on in this case--why doesn't it work from a nuts & bolts standpoint.

Thanks! Smile | :)

JennyP

JennyP29-Jul-02 19:33

29-Jul-02 19:33

After trying the first example and it not working (see my previous post), I tried the following and it worked. I guess the first compiles, but the pointer points not to where the actual data is stored but rather an empty data structure? (Just my WAG.) It seems the "GetActiveFrame()" may be important. If someone could explain the technical reasons, I'd appreciate it. Thanks!

CTtDoc *pDoc=(CTtDoc *)((CMainFrame *)AfxGetApp()->m_pMainWnd)->GetActiveFrame()->GetActiveDocument();

JennyP

Fred D.30-Jul-02 5:01

Fred D.

30-Jul-02 5:01

even by doind so, i've got a descent value of pDoc but the values it holds are all set to 0 ? Confused | :confused:

i keep looking....

JennyP30-Jul-02 5:54

30-Jul-02 5:54

Now that I think of it, my values were zero, but I expected them to be zero. I'll have to set my values to be some non-zero value and see what happens. If they remain zero, then it's likely pointing to a new and separate instance of CDoc that was just created.... hmmm...

JennyP

JennyP30-Jul-02 17:01

30-Jul-02 17:01

I found that I have the exact same problem. I'm going to cludge around it by passing the other class's pointer to CDoc and doing it in reversed. It's worked for me before.

If you find a solution, I'd be VERY interested! Thanks!

JennyP

JennyP30-Jul-02 18:05

30-Jul-02 18:05

Actually, I found that my pDoc (attained as shown in previous messages above) DOES WORK.

I had another problem with my pDoc->Function that returned 0s.

Anyway,..... works for me.... maybe you should double check your document values? I saw the values were good in the debugger and simply was being returned incorrectly from a function.

Good luck.

JennyP

Fred D.31-Jul-02 3:28

Fred D.

31-Jul-02 3:28

it's alright i found my mistake : a problem of where i declared the pDocument !

so now this part of code works fine, and i get access to the real values, all good.

PgGPS::PgGPS() : CPropertyPage(PgGPS::IDD)<br />
{<br />
	pDocument = NULL;<br />
	pDocument = (CMtsBaseDoc*)((CMainFrame*)AfxGetApp()->m_pMainWnd)->GetActiveFrame()->GetActiveDocument();<br />
	<br />
	//{{AFX_DATA_INIT(PgGPS)<br />
	//}}AFX_DATA_INIT<br />
}

by doing so in the constructor pDocument, accessible anywhere within the class, allows you to access to all the variables and methods in C..Doc. Cool | :cool:

Fred