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What does the following code declare?
I think it declares a structure 'node' comprising of a data value and other one is an address.
But cant we name the 'next' with a different pointer name?
Why is this named with the same name as of the structure?
struct node {
int data;
struct node* next;
};
The complete code is below:
struct node {
int data;
struct node* next;
};
/*
Build the list {1, 2, 3} in the heap and store
its head pointer in a local stack variable.
Returns the head pointer to the caller.
*/
struct node* BuildOneTwoThree() {
struct node* head = NULL;
struct node* second = NULL;
struct node* third = NULL;
head = malloc(sizeof(struct node)); // allocate 3 nodes in the heap
second = malloc(sizeof(struct node));
third = malloc(sizeof(struct node));
head->data = 1; // setup first node
head->next = second; // note: pointer assignment rule
second->data = 2; // setup second node
second->next = third;
third->data = 3; // setup third link
third->next = NULL;
// At this point, the linked list referenced by "head"
// matches the list in the drawing.
return head;
}<pre></pre>
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Razanust wrote: Why is this named with the same name as of the structure?
Because next is also a node. Got it?
Best wishes,
Navaneeth
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Razanust wrote: Why is this named with the same name as of the structure?
Because that is a pointer variable, which points to another similar structure (or may point to NULL if it is the last node). I suggest that you take a look at the Wikipedia Entry[^], which illustrates this with a diagrams (that must help you understand it better).
“Follow your bliss.” – Joseph Campbell
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Razanust wrote: I think it declares a structure 'node' comprising of a data value and other one is an address.
Yes, the address field points to another 'node': this way linked lists work.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Deleted.
modified 9-Jul-13 12:10pm.
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Look at LayeredWindows[^] for starters. The only way i can think of to connect this with OpenGL is to render your graphic into a bitmap with OpenGL and then use this bitmap to update your layered window. Hope this helps something.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <
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(Question 1): How do you obtain the data contained in the various CPropertyPage(s) that the CPropertySheet loaded by the AddPage() function?
(Question 2): How do you find out which page the User is presently on? Ex: how do I find out when all the data has been entered?, so I can collect the data entered(once I find out how to get the data from the CPropertyPage(s))
A C++ programming language novice, but striving to learn
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1) CPropertySheet::GetPage(int index) will return a pointer to a CPropertyPage object, which can be cast to a specific CPropertyPage derived class pointer; e.g., CMyPage* page = (CMyPage*)MySheet->GetPage(0);.
2) Likewise, CPropertySheet::GetActivePage()will return a CPropertyPage pointer to the active page. There's also a GetActiveIndex() which returns the integer index of the active page.
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1) treat each property page like a standard dialog: it reads and sets member variables that the owner can then set and read.
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In a Standard dialog you have a CWnd object in it's constructor, the "CBCGPPropertySheet" constructor does not. (see constructor below
"CPropSheet(CBCGPPropertySheet::PropSheetLook look,UINT uiIconsResID = 0, int cxIcon = 0);"
If it had an CWnd object I could easily pass that to the propertypage, How could I obtain the CWnd of the "CBCGPPropertySheet" so I can use it for the propertypage could load inline functions in the CBCGPPropertySheet object?(see inlines below
" //inline functions:
void SetDate(CString csDate){ m_csDate = csDate;}"
A C++ programming language novice, but striving to learn
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why do you need a CWnd ?
if you are creating the property sheets, you have the objects themselves - you don't need a CWnd.
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Are you wanting the pages to communicate with the sheet, or the pages to communicate with each other?
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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I may need both. I'm not certain yet which way is best. Could you show me an example of both. I'll try the examples an see which is best in my program.
A C++ programming language novice, but striving to learn
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Store the data in the sheet, and use the QuerySiblings() method to forward a message to each page in the sheet. If a page needs to get/put the data, it can get to it via GetParent().
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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Thanks.
A C++ programming language novice, but striving to learn
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I'm trying to write a program that will use ETW, but I'm feeling completely baffled by it. I've read as much documentation as I can find, I've tried looking for samples, and I've been Googling for two weeks. I don't understand much of what I read, and I have no idea how to apply what I do understand.
I think I'd understand it better if I had a very bare bones C/C++ program that used it. What I had in mind was a program that waits for one minute, and then couts the total amount of disk activity that occurred in that minute, as measured by ETW.
How would one do this?
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i_kant_spel wrote: I'm trying to write a program that will use ETW...
Event Tracing for Windows?
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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Yes. Event Tracing for Windows.
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Are you familiar with writing kernel-mode components and drivers?
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
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I don't know the first thing about kernel-mode code.
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Isn't that where ETW resides?
<edit>
I see here that ETW can be used at the user level and the kernel level.
</edit>
"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
modified on Tuesday, November 10, 2009 8:59 AM
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Thanks for that link. I did see that page before, but somehow I never noticed Using Events to Calculate CPU Usage [^] in that reference until just now, which is pretty much exactly what I thought would help.
So I got that code, and I'm trying to run it, but I don't quite understand how it's supposed to work. I made an .etl file using xperf, which contains some data on CPU sampling. And I altered the code so that LOGFILE_PATH points to that file.
Now, what it seems like it's doing is it calls ProcessEvent many times, but each time, in order for something useful to happen, IsEqualGUID(CpuUsageEvent, pEvent->Header.Guid) must return true. CpuUsageEvent is a static const, generated using VS2K8 tools. But pEvent->Header.GuidHeader.Guid seems to always return a value from a fixed set of possible GUIDs. These NEVER match the generated CpuUsageEvent, so ProcessEvent never does anything useful.
What am I doing wrong here?
Also, does ETW *have* to read from a log file? Maybe I don't know what I'm talking about, but it seems like being able to capture events and save them directly to a struct or object would be a lot more useful than dumping the data to a log and then immediately parse it afterwards.
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hi,
I'm trying to create a popup menu and modify the text font, colour and background colour for when the mouse is over an item. Does anyone know how to do this?
I can create the popup menu with TrackPopupMenu but I only know how to change the background colour of the items.
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doug25 wrote: I can create the popup menu with TrackPopupMenu but I only know how to change the background colour of the items.
Checkout these sections on Fonts and Text[^] in MSDN. They should tell you everything you need.
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the magic words are "owner drawn menu". there are a few articles here on CodeProject which can get you started.
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