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In case this helps anyone.
You can just override
virtual void OnSelectionChanged() {}
It's in the base class of CVSListBox.
I'm new to MFC. I can't understand the reasoning behind using message maps for some things and then override functions like this. Is it just an evolution of MFC towards sane C++ usage?
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hi, i need to do a system in c++ to interact with a monitor that has a few buttons. This application will perform some task when these buttons are pressed. I'm not quite sure where to start. any help?
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Do you need to make a shell or you want to make a win32 app?
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the program will have GUI for user to do some settings. after which these settings will be save and user will interact with the monitor button.
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Im sorry but I dont know you need declare button's event or ?
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nuttynibbles wrote: hi, i need to do a system in c++ to interact with a monitor that has a few buttons
Hi, how do you communicate with such external device (if I got it...)?
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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Hi guys,
In a number of CMS programs, I would like to have a HTML editor to edit some of the texts in an otherwise fixed layout. I have already written something that will work a CRichEditCtrl content into html code and that works fine. However, I would also like to be able to incorporate images and links into my text. Does anyone know of an html editor that I could use for this sort of thing?
I am only looking to edit the text. The layout of the site itself, the css codes and all that are handled separately. The html to be generated will be inserted into the pages of the site.
Thanks in advance.
WIlliam
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Hai!
I have a multiline edit box in my MFC application , it is also enabled with auto V-Scroll, after all the data is being displayed, it goes to the initial position, i have to scroll to the end, for data verification, is there any way to make the cursor to stay at the end or last position after printing all the data ?
Thankyou !
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kapardhi wrote: I have a multiline edit box in my MFC application , it is also enabled with auto V-Scroll, after all the data is being displayed, it goes to the initial position, i have to scroll to the end, for data verification, is there any way to make the cursor to stay at the end or last position after printing all the data ?
Do this...
extern CEdit* pEdit; // Some edit
pEdit.SetSel( 0, -1 ); // Move cursor to end
pEdit.SetSel( -1, -1 ); // Remove selection
Nibu babu thomas
Microsoft MVP for VC++
Code must be written to be read, not by the compiler, but by another human being.
Programming Blog: http://nibuthomas.wordpress.com
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hello !
what is happening is each time the data is entered into the multiline edit box the scroll bar goes to initial position and then comes down, it appears like blinking,
what i need is it must go down first and then decrease the size of scrollbar and stay at the end when data printed on the multiline edit box is completed!
thanks!
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kapardhi wrote: what is happening is each time the data is entered into the multiline edit box the scroll bar goes to initial position and then comes down, it appears like blinking,
Can you try EM_REPLACESEL. Something like...
pEdit->SendMessage( EM_REPLACESEL,
TRUE,
(LPARAM)static_cast<LPCTSTR>( csTextToBeInserted ));
Tell us if the blinking problem does get solved.
modified on Wednesday, November 26, 2008 7:55 AM
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I couldnot compile it my CEdit object is edtObj.
i did the following
CString str;
str = "Kaps";
edtObj.SendMessage (EM_REPLACESEL, TRUE, (LPARAM) static_cast (str));
it was giving following error
syntax error : '('
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kapardhi wrote: edtObj.SendMessage (EM_REPLACESEL, TRUE, (LPARAM) static_cast (str));
Sorry for that, I've modified my previous post, please check.
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thanks !
it still blinking but very less no. of times as compared to previous ones !!
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Also make sure that no text is selected, else the selection will get replaced which is what this function is meant to do. So you can remove selection (use SetSel) first before calling ReplaceSel.
Also note that there is an equivalent MFC function called ReplaceSel.
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Use CEdit::LineScroll
m_ctlEdit.LineScroll (m_ctlEdit.GetLineCount());
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Hello!
what is happening is each time the data is entered into the multiline edit box the scroll bar goes to initial position and then comes down, it appears like blinking,
what i need is it must go down first and then decrease the size of scrollbar and stay at the end when data printed on the multiline edit box is completed!
thanks!
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hi 
in a 3D graphics based MFC SDI application which method should i use to construct my frame loop?
Should i override OnIdle()?
or some other high resolution timing mechanism other than WM_TIMER?
Should i consider Multimedia timers?
Infact the right question would be should i use OnIdle or timers?
Main application is getting network data packets from different UDP ports each port has 50 hz throughput ( for every 20 ms for each packet ). Those data will be drawn on the screen.
3D framework used in application (VegaPrime) starts its own frameloop whenever framework application class (vpApp) is constructed after and MFC View is given as a drawing Window handle that 3D rendering context is related.
So i'm getting confused how to implement timing and synchronization in that MFC application?
help is needed..
thx alot.
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WM_TIMER is a very low priority message, WM_IDLE is even lower priority. You will potentially have update problems if you use these messages. I would recommend using multimedia timers[^]. Multimedia timers operate as callbacks so you may need to implement some synchronization.
Best Wishes,
-David Delaune
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hi David
i'm getting confused at that point whenever thinking on Timer mechanism. My 3D application should achieve a frame rate of at least 30 fps. What that means for each cycle frame takes almost 33.3 ms to (update+draw). What it means when i use 10ms as the time elapsed value if i use a Multimedia timer? It will call my callback every 10ms in where i put all my frame processing like updating entities, states, create new geometries or kill some and draw my scene etc. What happens if my updating and drawing is getting longer than 10 ms? or consider the other case what happens if i set 50 ms for timer period?..
using OnIdle time makes sense in that perspective. Since application main loop is consist of (Peeking Messages + Idle Processing) i'm not sure but i was just supposing that rest of the main loop time after handling messages would be happily used on Idle processing in which i put my updating and drawing code and this time is sufficent for all my needs.
would you please clarify that point?
..
thx for your reply,
lâ-edri.
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atillaselem wrote:
It will call my callback every 10ms in where i put all my frame processing like updating entities, states, create new geometries or kill some and draw my scene etc. What happens if my updating and drawing is getting longer than 10 ms?
Use of synchronization objects should be able solve this problem. When your variables are being updated by the socket class you should lock access to them, perhaps with a spinlock.
atillaselem wrote: using OnIdle time makes sense in that perspective.
WM_IDLE has the lowest possible priority in the message que. You are not guaranteed to recieve this message at all. If your window is designed in such a way... in that the message que never reaches zero then your WindProc will never recieve a WM_IDLE message period. In fact a third party application using Send/PostMessage() could prevent your application from recieving WM_IDLE by continously posting/sending/broadcasting messages. In my opinion WM_IDLE cannot be reliably used for window updating/redrawing.
WM_TIMER is nearly the same in that it is also a low priority message. The only thing you can rely on with WM_TIMER is that your application will eventually get the message. Many other messages are higher priority and can potentially be inserted into the message que and processed ahead of the WM_TIMER. This can result in variable timer speed meaning that your update frequency will vary by a few milliseconds in a high volume messaging window.
Multimedia timers were designed for this very purpose where very accurate intervals were required.
Best Wishes,
-David Delaune
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hi david,
i got the point with OnIdle
ok then what should i set as the multimedia timer period for a resonable 3D refresh rate? 10ms, 20ms..?
Is there a connection this timer period with drawing period?
It makes sense to me if UDP data coming from network is slower than drawing frame period. i mean UDP rate is 20 ms. if it was coming with 100ms rate then timer period would be ok but what now.. 
so that means i will store every packet in a queue and fetch them one by one with a rate of Timer frequency? Hmm..  That seems ok to me.
but i did not still understand relation between timer period and frame rate. Infact frame rate depends on geometry budget of gpu.
would you pls clarify this point if you know..
regards
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It seems that you have alot of architectural decisions to make. I don't know enough about your specific requirements to give you a specific direction. Here are some of my thoughts on the subject.
I can say that most 3D applications will render the scene as fast as possible and do not care about how fast or slow the datagrams are arriving. If some of the 3D spacial information is missing many applications use a copy of the last known coordinate + direction/speed etcetera. Also keep in mind that UDP datagrams may be received out of sequence if passing through multiple routers over a WAN. Which means if the server sends packet 1 then packet 2... You may recieve packet 2 before packet 1. TCP does not suffer from this limitation but requires much more overhead as you well know.
Its really your choice if you want to limit frame rate and remain synchronous with the data update rate. Some simulators can be implemented this way if they require the spacial data to be exactly as the motion estimators. If you have such a requirement then you can use the CreateEvent[^], OpenEvent[^] and SetEvent[^] to inform the scene renderer when data arrival has completed and it can safely render the next frame.
The choice is yours if you want frame rate to depend on UDP network speed.
Hope it helps,
-David Delaune
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