C / C++ / MFC

Re: Updating all active documents

10-Jul-03 8:37

You'll first need to call GetMainWnd(), then call GetActiveDocument().

John R. Shaw10-Jul-03 11:42

John R. Shaw

10-Jul-03 11:42

This should do what you want:

// Get position of first document template
POSITION pos = m_pDocManager->GetFirstDocTemplatePosition();
while( pos )
{
    // Get pointer to document template
    CDocTemplate* pTemplate = m_pDocManager->GetNextDocTemplate(pos);
    // Get position of first document using template
    POSITION pos2 = pTemplate->GetFirstDocPosition();
    while( pos2 )
    {
        // Get pointer to document
        CDocument * pDoc = pTemplate->GetNextDoc(pos2);
        if( pDoc )
            pDoc->UpdateAllViews();
    }
}
<pre\>
 

INTP

Dockable Window

fluxt10-Jul-03 8:14

fluxt

10-Jul-03 8:14

I have an application, and basically I just want to make it able to dock at the bottom of the screen... Its not a dialog, its simple a Win32 API CreateWindow() WS_OVERLAPPEDWINDOW window... Is there an easy way to do this?

Re: Dockable Window

Chris Richardson10-Jul-03 13:23

Chris Richardson

10-Jul-03 13:23

The following articles may help:

http://www.microsoft.com/msj/archive/s274.aspx[^]

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/programmersguide/shell_int/shell_int_programming/appbars.asp[^]

Chris Richardson
Terrain Software

accessing the elements of a struct from another class

johnstonsk10-Jul-03 7:53

johnstonsk

10-Jul-03 7:53

I know this is a studid question, but I am only able to create an instance of a struct.

I actually need an instance of the struct container

I have created a struct in class RFMAccess and I'm trying to get the elements from it in another class.

 struct TSimHeader { char Name[45]; char Unit[45]; double Min[45]; double Max[45]; int SignalCount; int SimStatus; }static TSimHeader_arr[10];

I can get them if I access them with the class name.

RFMAccess::TSimHeader_arr[j].Name[i];

I really don't want to have to type all of this so is there a way that I can create and instance of the container?

so I coule type s[j].Name[i]

I know, I know you guys feel like I have had the same kind of question for a week now.
Sorry, but I keep changing things around.
thanks for the help,
steven

Re: accessing the elements of a struct from another class

David Crow10-Jul-03 8:51

Re: accessing the elements of a struct from another class

10-Jul-03 8:51

No, not unless the other class was derived from RFMAccess. The statement s[j].Name[i] tries to resolve 's' to the calling class or any class it is derived from.

Even if this other class were made a friend class of RFMAccess, it still wouldn't help. This designation simply allows access to private and protected members, but you'd still have to qualify them.

johnstonsk10-Jul-03 8:53

johnstonsk

10-Jul-03 8:53

So, your saying that I can't make and instance of the struct container?

steven

Re: accessing the elements of a struct from another class

David Crow10-Jul-03 10:04

Re: accessing the elements of a struct from another class

10-Jul-03 10:04

Saying "struct container" is redundant as a struct is a container of (different) data types.

That aside, I'm not sure what you are asking. Your RFMAccess class has a TSimHeader structure in it with 10 instances defined. In order to access any one instance, you'll need to use square brackets like you've shown. It makes no difference whether you use TSimHeader_arr[i], or s[i].

Here's a kludgy example:

class MyOtherClass
{
    // a pointer to a single instance
    struct RFMAccess::TSimHeader *ts;

    void foo( int x )
    {
        // point to the instance
        ts = &(RFMAccess::TSimHeader_arr[x]);
    }
};

You could also add the following function to your RFMAccess class:

static struct TSimHeader *GetSingleInstance( int x )
{
    return (&TSimHeader_arr[x]);
}

And use it in another class like:

void foo2( void )
{
    struct RFMAccess::TSimHeader *ts;
    ts = RFMAccess::GetSingleInstance(0);
}

Notice that qualification is still necessary for both usages.

johnstonsk10-Jul-03 10:20

johnstonsk

10-Jul-03 10:20

OK I see what you are saying,

Thanks,
steven

(cin>>x).get( );

DaveE9th10-Jul-03 7:44

10-Jul-03 7:44

I was reading that a function always requires a return, but I don't see one for the statement below. I've posted the entire program below also. Thanks. OMG | :OMG:

(cin>>x).get();

----------------------------------------------------------
#include "iostream.h"
#include "string.h"

int main()
{
int x;
int i;
char str[80];
bool isfinished=false;
char Info [] [300] =
{
"3030-02-000-5287" , "Here is the information for this number." ,
"3030-03-000-0029" , "Here is the information for this number." ,
};
while(isfinished==false)
{
cout<<"\nPlease enter a number:\n";
cin>>str;
for(i=0; i < 4; i += 2)
if(!strcmp(str, Info[i]))
{
cout<<"\nInformation:"<<info[i+1]<<"\n";
break;
="" }
="" if(i="=" 4)
="" {
="" cout<<"number="" not="" found.\n";
=""
="" cout<<"\nwould="" you="" like="" to="" check="" another?\n";
="" cout<<"enter="" 1="" for="" yes,="" 0="" no.\n";
="" (cin="">>x).get();//no return?

}
if (x==0) isfinished=true;
}
return 0;
}

Nick Parker10-Jul-03 8:25

Nick Parker

10-Jul-03 8:25

DaveE9th wrote:
(cin>>x).get();//no return?

It appears to be a typo (or I am wrong). It should either be:

cin >> x;

int x = cin.get();

-Nick Parker

John M. Drescher10-Jul-03 10:38

John M. Drescher

10-Jul-03 10:38

DaveE9th wrote:
if (x==0) isfinished=true;

This is incorrect. It should be

if (x == '0') isfinished=true;

John

Michael Dunn10-Jul-03 13:30

Michael Dunn

10-Jul-03 13:30

(cin>>x).get() is a confusing way of writing:

cin >> x;<br />
cin.get();

The >> opertor returns a reference to the stream, so you can call the get() method on the return value.

--Mike--
"I'm working really, really fast at the moment, so a 3 minute outage becomes, due to time dilation, a 5 minute outage."
-- Chris Maunder, relativistic system administrator
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber

Nick Parker10-Jul-03 18:10

Nick Parker

10-Jul-03 18:10

Interesting, I thought it looked like a typo.

Learn something new every day. Big Grin | :-D

-Nick Parker

DaveE9th10-Jul-03 21:57

10-Jul-03 21:57

I still don't quite understand why function "get();" doesn't need a return. Why is this?

Thanks, Dave
Hmmm | :|

Ryan Binns10-Jul-03 22:46

Ryan Binns

10-Jul-03 22:46

The get() function with no parameters reads and returns the next character from the stream. If this character is not required (eg. you simply need to skip to the next character) then there is no use for the return value.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

DaveE9th11-Jul-03 7:27

11-Jul-03 7:27

I read that if a function did not return a value that (at a minimum) you had to use the "void" prototype...such as below:

void main( )

no?

hmmmmm

Dave

OMG | :OMG:

Ryan Binns11-Jul-03 15:59

Ryan Binns

11-Jul-03 15:59

The get() function returns a value - the value of the next character read. This program simply doesn't use the returned value.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

DaveE9th12-Jul-03 2:29

12-Jul-03 2:29

Thanks Ryan

"The man who reads nothing is better educated than the man who reads nothing but
newspapers."- Thomas Jefferson

btrees in STL

Anonymous10-Jul-03 7:43

Anonymous

10-Jul-03 7:43

is there an implementation of btrees in STL?

valikac10-Jul-03 7:48

valikac

10-Jul-03 7:48

Are you referring to a binary tree structure? If yes, STL containers including set and map are designed using binary stree structure.

Kuphryn

David Crow10-Jul-03 8:58

10-Jul-03 8:58

By btree, do you mean a binary tree, which can be lopsided, or a B-tree, which is always balanced?

Anonymous10-Jul-03 12:24

Anonymous

10-Jul-03 12:24

a balanced tree that is.

however, any kind of a tree I guess wouldn't be bad. Anything like CTreeCtrl in MFC even?

David Crow11-Jul-03 3:08

11-Jul-03 3:08

B-tree, red/black tree, splay tree, and AVL tree are all examples of balanced trees, each with their own set of nuances.

The CTreeCtrl class is for displaying a hierarchical list of items, much like Windows Explorer.