|
|
Take a minute to read. I could not shorten my problem... be patient...
I have a CBaseEvent class
There are other two classes have derived from CBaseEvent named CSysEvent and CGuiEvent
I have created a queue of CBaseEvent pointers.
This queue is being processed by an event handler class. A thread is working for this.
Whenever a new event adds on the queue, this thread will process the event by calling ProcessEventFunction. which prototyped as ProcessEventFunction(CBaseEvent* pEvent)
Here comes the problem. How can I identify between System Event and GUI event?
These are the possibilities I have
1. Use dynamic_cast identify the pointer using dynamic cast. Then do the further processing depends on Sys event or GUI event.
2. Do the above check inside the thread itself and call the ProcessEvent function overloaded with GUI event and SysEvent depends on the result
3. Use two queues. One for sys event and another for GUI event. Run two threads for the same and call the overloaded ProcessEvent function depends on the queue. Here definitely I’ll face some problems with the order of the events received. I need to process the sys and GUI events in first come first serve manner. So this approach will have sync issues.
The above are the solutions I have!!! Could you pls suggest one from this or a new one?
Again sorry for borring you with a long question 
SaRath.
"Do Next Thing..."
Understanding State Pattern in C++
|
|
|
|
|
I've relied on poor man's RTTI by adding a protected member of the enum type CBaseEvent::Type to the base class. The enum is set in each base class constructor. CBaseEvent has a getType() method that returns the type of subclass.
/ravi
My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com
|
|
|
|
|
Create a ProcessEventFunction on the base class CBaseEvent that is overloaded for proper processing and invoke that function.
|
|
|
|
|
I've used virtual functions for this, so that you don't have to identify the type.
Chris Meech
I am Canadian. [heard in a local bar]
When no one was looking, every single American woman between the ages of 18 and 32 went out and got a tatoo just above their rumpus. [link[^]]
|
|
|
|
|
Virtual Functions ? 
---
With best regards,
A Manchester United Fan
The Genius of a true fool is that he can mess up a foolproof plan!
|
|
|
|
|
|
Well not sure if this is exactly what you need, but here goes.
Define the funtion that you want to call as a pure virtual function in CBaseEvent. Code their implementations in CSysEvent and CGuiEvent.
Now whenever you want to call the function, just upcast the CBaseEvent's pointer with either CSysEvent or CGuiEvent's address.
CBaseEvent* Base ;<br />
CSysEvent Sys ;<br />
Base = &Sys ;<br />
Base->Function() ;
Hope this was helpful.
---
With best regards,
A Manchester United Fan
The Genius of a true fool is that he can mess up a foolproof plan!
|
|
|
|
|
SaRath C wrote: How can I identify between System Event and GUI event?
 Why? The whole design is based on not needing to identify them. 
|
|
|
|
|
Dear All,
I have to write an Add-Ins or automation solution for MS-Word to support my own mail merge utility that can enable the user to embed controls[Like Drop Down box]in the word document.
Note:
Existing Mail merge utility in MS-Word enables only to include labels [ie.,texts]
Kindly suggest me a solution.
Karthik M
|
|
|
|
|
|
Hi everyone.
I have a problem, and no ideas...
<br />
class municipality<br />
{<br />
private:<br />
...<br />
<br />
HRGN the_region;<br />
...<br />
}<br />
I work with the array of type municipality, in C++ declared as GLOBAL variable.
<br />
municipality* g_my_municipalities;<br />
<br />
g_my_municipalities = new municipality[size];<br />
Then I loop through the array to do the 'hit tests' etc...
The problem appears when I attempt to transform the regions (HRGN).
I used the following routine to transform it:
<br />
void municipality::Transform(float factor, POINT offset)<br />
{ <br />
WORD size;<br />
<br />
LPRGNDATA pData;<br />
<br />
XFORM xfr;<br />
<br />
xfr.eM11 = factor;<br />
xfr.eM12 = 0;<br />
xfr.eM21 = 0;<br />
xfr.eM22 = factor;<br />
xfr.eDx = offset.x;<br />
xfr.eDy = offset.y;<br />
<br />
size = GetRegionData(the_region, 0,0);<br />
<br />
pData = new RGNDATA[size];<br />
<br />
GetRegionData(the_region, size, pData);<br />
<br />
the_region = ExtCreateRegion(&xfr, size, pData);<br />
<br />
delete pData;<br />
}<br />
The problem is that there is a memory leak, but I thought of a following concept:
1) To create and keep the original array of municipalities, preserving the original (untransformed regions),
2) To create temporary array of municipalities and then to fill it with the original values (regions) and then to apply the transformation to this array,
3) To erase the temporary array 'delete [] temp_municipality (go arround the memory leak) in order to free the memory.
The thing is that I do not have an idea on how to design the copy constructor for the municipality class, for the member HRGN.
I would appreciate the help on this!
Thanks in advance...
|
|
|
|
|
Where exactly you are getting the leak ??? Debug the code and let us know.
Appu..
"If you judge people, you have no time to love them."
|
|
|
|
|
Well, the leak appears at the Transform function, it seems to me that every time the code does:
the_region = ExtCreateRegion(&xfr, size, pData);
i.e. assigns the newly created (trasnformed region) to the_region member
the memory leaks.
If one is interested to debug this I will send an entire source code, but for now I would like to get around with the two arrays and the proper copy constructor.
|
|
|
|
|
|
Well, I got inspired, I did try the DeleteObject earlier but now I solved the problem by involving two data members of HRGN, where, before transforming one of the members I dele it with DeleteObject and then use the ExCreateRegion to re-create new region from the original and then apply the new transorfmation data!
However, I would still appreciate if anyone could 'teach us' on how to implement the copy constructor involving the HRHN, HWND, HDC and the rest of the GDI interesting structures!
|
|
|
|
|
nermsk wrote: delete pData;
Try this
delete[] pData;
|
|
|
|
|
how can i get the Gmt time
WithOut Using the CUrrentTime function.
i tried with GetGmtTm(),
it's not working with out CurrentTime,
But we did not use CurrentTime.
sree.
|
|
|
|
|
Lets see:
You did create a CTime-variable initialized it with your time (complete wit correct timezone and such), called GetGmtTm() on it and read out the time from the tm struct you got.
What exactly went wrong?
"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."
-- Caius Petronius, Roman Consul, 66 A.D.
|
|
|
|
|
|
|
Try out the example here[^] and see if it works.
|
|
|
|
|
Hi,
I can not set the breakpoint in the coding.I check the Set Active Configuration mode in Build menu.Its in debug mode only.Then why its happening like this.
I have like this problem lot of time.But i check configuration settings,its in release mode,then i check tht to debug mode,and i can set break point.
I do the same thing now,but its not working.When i keep breakpoint,it tells that the breakpoint get disabled and execution is stopped before that line.
|
|
|
|
|
What IDE are you using ? You may also check that you build with the 'Generate debug information' or 'Program Database for Edit & Continue' (depends of the IDE).
Be sure also that your breakpoint is on a valid instruction (something that produces assembly code, declaring a variable for example doesn't produce assembly code).
Cédric Moonen
Software developer
Charting control
|
|
|
|
|
I am using vc++ 6 version.And i keep the breakpoint in a valid place.Not in any declaration position.But i dont know why its coming but i got a solution.What i did is ...
In link tab, output file name the path is simple exe name,not like debug\new.exe.
So i changed the file name as debug\new.exe.then its working properly.
But i dont want to create my exe in debug folder.So, again i changed output file name simply as new.exe.
Now also its working properly.
I dont know wats happened inside that.Simly i confused.But i got the solution.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
