C / C++ / MFC Discussion Boards

Re: Console Application

Maxwell Chen14-Apr-06 3:12

Maxwell Chen

14-Apr-06 3:12

It crashes at here:
} while (_findnext (File_handle, &file_s) == 0);

Maxwell Chen

Re: Console Application

parichaybp16-Apr-06 19:28

parichaybp

16-Apr-06 19:28

Hi,

Can u plz tell me how to correct the error??

diff between Send message and Post message

Krishnatv14-Apr-06 0:59

Krishnatv

14-Apr-06 0:59

hai,
I dont know the difference between what is the SendMessage and PostMessage and Difference between SendMessage and Postmessage.

Krishna

Re: diff between Send message and Post message

HakunaMatada14-Apr-06 1:33

HakunaMatada

14-Apr-06 1:33

It can be said that SendMessage is Synchronous in nature and PostMessage is Asynchronous in nature.

Check out this[^] and this[^]

Please google before posting a question. Smile | :)

---
With best regards,
A Manchester United Fan

The Genius of a true fool is that he can mess up a foolproof plan!

Re: diff between Send message and Post message

Amar Sutar14-Apr-06 2:55

Amar Sutar

14-Apr-06 2:55

SendMessage(..)

The SendMessage function sends the message to a window or windows. It calls the window procedure for the specified window and does not return until the window procedure has processed the message.

PostMessage(..)

The PostMessage function places a message in the message queue associated with the thread that created the specified window and returns without waiting for the thread to process the message.

For more information search on the following site with SendMessage:

http://www.msdn.microsoft.com

Regards
Amar Smile | :)

Re: diff between Send message and Post message

Russell^'14-Apr-06 3:26

Russell^'

14-Apr-06 3:26

I can give you an example to understand when use the functions:
If you want that an object (CWnd) close itself without problems, probally the best solution is Postmessage(WM_CLOSE). Elseway if in a member (of this object) function you use Sendmessage the object will be destroyed before that the function ends, and it is probable that after Sendmessage some operations will be done on the members of this object. So this is a cause of a crash.

Have a nice code day Wink | ;)

-- modified at 9:27 Friday 14th April, 2006

Tree View Right Click Problem.

harshandu14-Apr-06 0:57

harshandu

14-Apr-06 0:57

Having problems about right clicking on an item in a tree control. The item
that is clicked on is not the right one.
If I have three items in a tree.
Here is my problem. I click on the first item with normal click. I click on
the third item with the right click mouse. In this event I had a messagebox
telling me which item is selected, and this one comes out with the first
item no mather what. I also tried to get into the OnSelchangedItemfieldtree
function - but with no luck.

How can I right click on the third one and get its name out of it? Does
anyone know?

More relaxed the person,high is his status.

Re: Tree View Right Click Problem.

Amar Sutar14-Apr-06 2:48

Amar Sutar

14-Apr-06 2:48

For handling right click override Tree control's OnRButtonDown.
In this function HitTest with the point so that u will get the selected item and then use GetItemText to get name of the item.

void CExplorerView::OnRButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default

// To get selected item
HTREEITEM hTreeItem = GetTreeCtrl().HitTest(point);

GetTreeCtrl().SelectItem(hTreeItem);

CString cstrItemText = GetTreeCtrl().GetItemText(hTreeItem);

CTreeView::OnRButtonDown(nFlags, point);
}

Regards

Amar Smile | :)

how to read .PST file using VC++

K. narasimharao14-Apr-06 0:40

K. narasimharao

14-Apr-06 0:40

I am unable to read .PST files using VC++. I am developing an application like Outlook.
In that I have to read the outlook mails into my application. Please give any suggesstions.

knarasimharao

Re: how to read .PST file using VC++

HakunaMatada14-Apr-06 1:35

HakunaMatada

14-Apr-06 1:35

K. narasimharao wrote:
I am unable to read .PST files using VC++. I am developing an application like Outlook.
In that I have to read the outlook mails into my application. Please give any suggesstions.

Use MAPI to access the PST file. Smile | :)

---
With best regards,
A Manchester United Fan

The Genius of a true fool is that he can mess up a foolproof plan!

please read: its importent

baldha rakesh14-Apr-06 0:30

baldha rakesh

14-Apr-06 0:30

how to show a button which will create in seprate dll ,
in detail:

i am calling a DLL in which a button is created but i want to show this button on my main dialog please tell me what i have to do for this.

Bankey Khandelwal
Software Engineer

Re: please read: its importent

David Crow14-Apr-06 2:54

David Crow

14-Apr-06 2:54

Didn't you just ask this very same question barely an hour before this one? CodeProject is seen by folks from all over the world. You must give them all a chance to read, and digest, your question. Posting the same question over and over is a sure-fire recipe to irritate folks to the point they do not want to help, even if they knew how.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: please read: its importent

Gary R. Wheeler14-Apr-06 3:15

Gary R. Wheeler

14-Apr-06 3:15

DavidCrow wrote:
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

And are you thankful in this case Big Grin | :-D

?

(Sorry, I just couldn't resist)

Software Zen: delete this;

Fold With Us![^]

Re: please read: its importent

David Crow14-Apr-06 3:34

David Crow

14-Apr-06 3:34

Gary R. Wheeler wrote:
And are you thankful in this case ?

Well, I am successful. Cool | :cool:

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: please read: its importent

toxcct14-Apr-06 4:16

toxcct

14-Apr-06 4:16

seems that he didn't like your answer... see here[^] Roll eyes | :rolleyes:

Re: please read: its importent

David Crow14-Apr-06 4:21

David Crow

14-Apr-06 4:21

Sorry, I do not waste my time looking at votes. They only mean anything to those that did the voting.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: please read: its importent

toxcct14-Apr-06 4:27

toxcct

14-Apr-06 4:27

i was showing that he asked in COM and ATL forums after your answer...

Working with C and C++ together in one application

George_George14-Apr-06 0:13

George_George

14-Apr-06 0:13

Hello everyone,

I need to work with C and C++ together in one application, for example, I need to call C++ methods from C method. And I have also used some namespace and other C++ features in my C++ method. So, is it possible to invoke C++ methods containing namespace (or other C++ specific features) from C?

I am using Visual Studio .Net. I am wondering how to make C and C++ work together. Are there any existing tutorials?

thanks in advance,
George

Re: Working with C and C++ together in one application

C^hris L^osinger14-Apr-06 2:21

C^hris L^osinger

14-Apr-06 2:21

George_George wrote:
So, is it possible to invoke C++ methods containing namespace (or other C++ specific features) from C?

not simply. you can put C++ inside a DLL or a COM object and let C call it that way. but otherwise, no. they are two different languages and you need some kind of language-neutral interface (ie. DLL/COM) for them to be able to interact.

Cleek | Image Toolkits | Thumbnail maker

Re: Working with C and C++ together in one application

George_George15-Apr-06 23:12

George_George

15-Apr-06 23:12

Thanks man,

I think even if I put C++ inside a DLL I have to make a .h file for C code to compile. Then, I can link with the DLL. Is that correct?

So, the further question is that, I have to define a .h file for C++ methods for C, I am wondering how to do that? Do you have any samples?

regards,
George

Re: Working with C and C++ together in one application

C^hris L^osinger16-Apr-06 5:34

C^hris L^osinger

16-Apr-06 5:34

George_George wrote:
I have to define a .h file for C++ methods for C

you won't be defining C++ methods, you'll be defining C functions, and exporting only C functions. the DLL can use C++ internally, but the external interfaces need to be all C. if you need to pass objects out of the C++ code, you'll need to do it using "void *" or some other trick.

Cleek | Image Toolkits | Thumbnail maker

Re: Working with C and C++ together in one application

George_George16-Apr-06 19:38

George_George

16-Apr-06 19:38

Thanks for your reply!

I have two more points,

1. I think to utilize C++ methods from C, I can also build C++ files into object files and then make C modules link with those object files. Is that method ok? Why do you say I have to build C++ methods into DLL?

2. Are there any existing samples to illustrate your methods/tricks?

regards,
George

Re: Working with C and C++ together in one application

C^hris L^osinger17-Apr-06 1:03

C^hris L^osinger

17-Apr-06 1:03

1a. i don't know i've never tried.
1b. again, C and C++ are different languages and you need a language-neutral interface between them.

2. i don't have any small ones handy

Cleek | Image Toolkits | Thumbnail maker

Re: Working with C and C++ together in one application

George_George19-Apr-06 22:36

George_George

19-Apr-06 22:36

Thanks!

My last question is that, if I want to use C++ functions from C. Do I have to build C++ functions into DLL then invoking functions from DLL? Can I just make a single project to include both C++ functions and C functions, and then build them altogether?

regards,
George

Re: Working with C and C++ together in one application

David Crow14-Apr-06 2:45

David Crow

14-Apr-06 2:45

George_George wrote:
So, is it possible to invoke C++ methods containing namespace (or other C++ specific features) from C?

Sure, as long as the C code is in a .cpp file. Just create an instance of the C++ object and use its methods just like you would from anyplace else.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

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