Re: Problem in Accessing CArray object - C / C++ / MFC Discussion Boards

Atul2316-Oct-07 23:05

16-Oct-07 23:05

I am accesssing CArray object in other class as follows

CWebsiteCreatorWizard *pPtr = (CWebsiteCreatorWizard *)GetParent();

if(NULL != pPtr)
nTotalWebPageCount = pPtr->m_WebSitePagesAry.GetSize();

Where
CWebsiteCreatorWizard is wizardseet class in which i declare

CArray<chtmlpgdetail,chtmlpgdetail> m_WebSitePagesAry is array of strings

could u guess why I get here Garbage value in nTotalWebPageCount.

Regards

A23

Re: Problem in Accessing CArray object

chandu00416-Oct-07 23:15

chandu004

16-Oct-07 23:15

Atul23 wrote:
CWebsiteCreatorWizard *pPtr = (CWebsiteCreatorWizard *)GetParent();

first make sure that, the above line fetches you the correct pointer of your required class.

to do that, first, you define a simple integer variable,
say int temp=47; in CWebsiteCreatorWizard class.

then try to access it and see its value.

if its value is 47, then, we can proceed to find the next step to localise the problem.

Re: Problem in Accessing CArray object

Atul2317-Oct-07 0:47

Atul23

17-Oct-07 0:47

Hi Chandu,

I can not access value of temp in other class by using pointer. so could u give me next steps please.

Thanks in Advance

A23

Re: Problem in Accessing CArray object

chandu00417-Oct-07 1:14

chandu004

17-Oct-07 1:14

so it means that, you are not able to properly pass your object handle to the place where required.
now, define it globally and try to access.

Re: Problem in Accessing CArray object

ThatsAlok17-Oct-07 2:02

ThatsAlok

17-Oct-07 2:02

in continuation with Chandu(good reply) better look for singleton design!

"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
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Re: Problem in Accessing CArray object

chandu00417-Oct-07 2:13

chandu004

17-Oct-07 2:13

ThatsAlok wrote:
better look for singleton design!

can you explain?
thank you.

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

Suggestion to the members:
prefix your main thread subject with [SOLVED] if it is solved.
chandu.

Re: Problem in Accessing CArray object

ThatsAlok17-Oct-07 2:28

ThatsAlok

17-Oct-07 2:28

chandu004 wrote:
can you explain?

please refer this :-
Singleton Pattern[^]

instead of making global variable.. it is better to use singleton class.!

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

Re: Problem in Accessing CArray object

David Crow17-Oct-07 3:27

David Crow

17-Oct-07 3:27

Is GetParent() returning a valid (i.e., the actual parent) pointer? Note that just because the value is non-NULL does not mean it is valid. Is m_WebSitePagesAry non-empty? Even if it wasn't, nTotalWebPageCount would be 0 (assuming that the answer to my first question is "yes").

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Download image programmatically

Y K Kishore Kumar16-Oct-07 21:46

Y K Kishore Kumar

16-Oct-07 21:46

I want to download an image from a URL and show it on a UI. Can any body please give me some example how to do it.

Thanks.

Kishore

Re: Download image programmatically

Hamid_RT16-Oct-07 22:59

Hamid_RT

16-Oct-07 22:59

See URLDownloadToFile.

Re: Download image programmatically

ThatsAlok17-Oct-07 1:31

ThatsAlok

17-Oct-07 1:31

http://www.codeproject.com/internet/urldownload.asp[^]

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

how to get the line number of exception (details) in a try catch(...) block

Rocky#16-Oct-07 21:38

Rocky#

16-Oct-07 21:38

hello everyone,

I've been using C# mostly and now I've to use C++ and I'm a bit stumped by that

try{}
catch(...)
{}

structure. I wanna get the line number and other details of the exception being caught. how can I get that info??

Thanks in advance

Rocky

You can't climb up a ladder with your hands in your pockets.

Re: how to get the line number of exception (details) in a try catch(...) block

Matthew Faithfull17-Oct-07 0:15

Matthew Faithfull

17-Oct-07 0:15

Plain C++ doesn't have the reflection capabilities of C# so what you want to do, to be generic, requires the use of symbolic debug information. In other words you can do this but it's not straight forward and will only work in Debug builds with the PDB available. The full process of turning addresses into line numbers and a great deal more is explained in this book by John Robbins[^] and the associated source code will give you what you need. If you can find John's web site it should all be available for free download.

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

Re: how to get the line number of exception (details) in a try catch(...) block

Rocky#17-Oct-07 0:22

Rocky#

17-Oct-07 0:22

ok thanks!

Rocky

You can't climb up a ladder with your hands in your pockets.

Re: how to get the line number of exception (details) in a try catch(...) block

Mark Salsbery17-Oct-07 5:39

Mark Salsbery

17-Oct-07 5:39

Do the __FILE__ and __LINE__ macros help any?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: how to get the line number of exception (details) in a try catch(...) block

Rocky#21-Oct-07 19:29

Rocky#

21-Oct-07 19:29

__LINE__ macro gives the line in the catch block not the one from where the exception occurs... __FILE__ does give u the file name though

Rocky

You can't climb up a ladder with your hands in your pockets.

Re: how to get the line number of exception (details) in a try catch(...) block

Mark Salsbery23-Oct-07 8:03

Mark Salsbery

23-Oct-07 8:03

Rocky# wrote:
__LINE__ macro gives the line in the catch block not the one from where the exception occurs

Right. That's about all you get. You can always throw an exception that contains
useful source information, including using those macros.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Small doubt

kuttiam16-Oct-07 21:30

kuttiam

16-Oct-07 21:30

Hi,
Can any one tell me how to differentiate messagebox dialog from other dialogs.

Thanks in advance. Smile | :)

Re: Small doubt

chandu00416-Oct-07 21:59

chandu004

16-Oct-07 21:59

why do you have any of your dialogs which look like messagebox?

Re: Small doubt

Nelek16-Oct-07 22:04

Nelek

16-Oct-07 22:04

As the MessageBox comes from CWnd and CDialog is a CWnd derived class but "independant" you can try

CDialog* pDlg = (CDialog*) GetActiveWindow ();
if (pDlg->IsKindOf(RUNTIME_CLASS(CDialog)))
//you have a dialog
else
//you have another thing, maybe a messagebox, maybe a view, maybe a window

Another way to do the difference is the first member of both possibilites. By MessageBox the first member is a handler o a window hWnd, and in a DialogBox this handler is of the application instance hInstance

Hope it helps

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Re: Small doubt

kuttiam17-Oct-07 19:07

kuttiam

17-Oct-07 19:07

Hi,
Thanks for ur reply.
I am trying to write a message box hook.
In that i need to differentiate the message box from other windows and dialogs.
I tried your suggestion but i could not achieve that Cry | :((

.

I appreciate your help. Smile | :)

Re: Small doubt

ThatsAlok17-Oct-07 1:37

ThatsAlok

17-Oct-07 1:37

kuttiam wrote:
Can any one tell me how to differentiate messagebox dialog from other dialogs.

MessageBox is type of dialog. but you don't need template to create it as it required by Dialog. plus a single api call i.e. MessageBox will create the message box for you!

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

wstring to string question

monsieur_jj16-Oct-07 21:22

monsieur_jj

16-Oct-07 21:22

Hi all,

I made this function of getting a unicode MAPI property:

LPMESSAGE msg = NULL;
	wstring subj;
		HRESULT hrProperty;	
		LPSPropValue lpPropValue = NULL;
		
		hrProperty = HrGetOneProp(m_Message->Interface(), PR_SUBJECT_W, &lpPropValue);
		if (hrProperty == S_OK)
		{	
			subj = static_cast<wstring>(lpPropValue[0].Value.lpszW);
		}
		
	return _bstr_t(subj.c_str());

now I need the subj value for SetSubject(Subj.c_str(),codePage) from altmime however when I pass the value of subj to a string it loses it's contents(I am retrieving asian characters) it turns into ??? from the original value.

Help please,
Jj

Re: wstring to string question [modified]

ThatsAlok17-Oct-07 1:36

ThatsAlok

17-Oct-07 1:36

monsieur_jj wrote:
when I pass the value of subj to a string it loses it's contents(I am retrieving asian characters) it turns into ??? from the original value.

offcourse it will lose every thing as string can have 256 value per character and wide string have 2 power <superscript>16 values per character. so if you are using asian character set ..then work with wide string only

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

How to display only console window and hiding dialogbox?

mss8116-Oct-07 21:17

mss81

16-Oct-07 21:17

Hi,

In this MFC dialog base project, I used command line arguments. I want to make my application like, when user give /silent argument from command line, only console window should be display else
normal dialog box. I used AllocConsole function in OnInitDialog function. Using that it displays both the windows viz cosole and dialog.

I used the following lines :

if (!AllocConsole())
AfxMessageBox("Failed to create the console!", MB_ICONEXCLAMATION);

please help me ...?

Regards,
Mayuresh

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