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I have a CTreeView and a member m_TreeCtrl which is of CTreeCtrl type.
Everytime I use m_TreeCtrl.DeleteItem() to remove an item from the tree, all of the items will be collapsed automatically!!!
Have any of you met this problem? How could I solve this problem?
Thanx in advance.
Alex Dong
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i sent you this mail:
just idea:
haven't you TVS_SINGLEEXPAND?
t!
and now it returned me:
This is the Postfix program at host mta1.etang.com.
I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.
For further assistance, please contact <postmaster@etang.com>
If you do so, please include this problem report. You can
delete your own text from the message returned below.
The Postfix program
ÄúşĂŁş
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ллŁˇ
<ltmail@bpme.com>: Name service error for domain bpme.com: Host found but no
data record of requested type
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No, I haven't set the TVS_SINGLEEXPAND. Here is the code:
if (!m_TreeCtrl.Create( WS_VISIBLE | WS_CHILD |
TVS_HASBUTTONS | // Adds a button to the left of each parent item.
TVS_HASLINES | // Has lines linking child items
// to their corresponding parent items.
TVS_LINESATROOT | // Has lines linking child items to
// the root of the hierarchy.
TVS_EDITLABELS | // Allows users to edit the labels of tree view items.
TVS_SHOWSELALWAYS,// Causes a selected item to remain selected when
// the tree-view control loses focus.
rc,
this,
0x1005 ) )
Thank you!
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Hi,
I am new to MFC and work on a physical simulation application. I am a bit insecure on how to build up the program and would be thankful for any advise.
The simulation shall be updated as often as possible. The update of the simulation then affects the viewing data (vertices and polygons etc) displayed using OpenGL. The framerate of the viewupdate shall be fixed to around 12/sek.
1.Where is best, most natural, to put the simulationupdate-call? Is it in a CWinApp derived class´s Idle-Event-handler? In that case, how do I get a pointer to the CDocument-derived class that holds the simulation-data?
2.Where is best to put the view-update-call, i.e the call that updates the viewing data and then redraws the display-window? Is it in a timer-event of a CView derived class?
Thanks/JoNy
JoNy
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The simulation shall be updated as often as possible.
This leaves only one option: put the simultation-update code into separate worker thread.
The framerate of the viewupdate shall be fixed to around 12/sek.
Isn't it contradictory with previous requirement? I mean, if you're going to display 12 frames per second, why do you need maximum speed in the data-update code?
Tomasz Sowinski -- http://www.shooltz.com
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Thanks,
no it is not contradictory since I am not interested in sync between physical simulation and the view of it. If the simulation iterates 100 times/sek and the view of it 12 times/sek that means that the action (i.e every tiny little change)occurs faster than what is possible to show. But the thing with physical simulations is that it has to take all those small steps to reach a certain point.
How do I create separate worker threads? Are there any good articles on it?
Thanks again /JoNy
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How do I create separate worker threads?
AfxBeginThread in MFC, _beginthread, _beginthreadex in C/C++ Runtime library. There's also CreateThread if you're playing directly with Win32 API, but it's not recommended if your thread use standard C/C++ functions (they need to be initialized on per-thread basis; CreateThread is a Windows function that doesn't know anything about C/C++ library).
search for these function names, I'm sure MSDN has lot of multithreading samples. Here at CodeProject look at 'Threads, Processes and IPC' section.
Tomasz Sowinski -- http://www.shooltz.com
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hi, hav'n problems in making 2 processes to communicate with each other .. actually 1 of these invokes the other using CreateProcesss and thne when i try to senda message it is not captured by the other (child) process ..... need guidance or maybe some alternative to achieve this ....
thanks in advance ...  :
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Hi !
You can use old things that work quite right, "Memory File Mapping" or "Named pipes", there you open a file in memory and you send that to the other proccess, quite fast and quite good for simple communication.
But... If you want something more complex, you can use COM, and use a Sink interface.
If you need more help, please ask me, Bye !
Braulio
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I want App A to Tell App B to do something.
i.e. I want the 2 processes to communicate. App A and App B are both written by me so I can make modifications ot the code if required. can anyone help.
Maliha
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There are several IPC (inter-process communication) methods. If you only need to transfer a simple block of data, WM_COPYDATA should work fine. Check out the Threads & IPC section here at CodeProject for more.
--Mike--
http://home.inreach.com/mdunn/
Trillian: What are you supposed to do with a manically depressed robot?
Marvin: You think you've got problems. What are you supposed to do if you are a manically depressed robot?
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I tried using WM_COPYDATA. But there is a problem:
You need a handle to the destination Window. Where do I get that? How do I know what the handle of the window in another process is? I tried using HWND_BROADCAST but then other applications started to catch the message and crashed. (Outlook.exe crashed and so did explorer)
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You can enumerate all the windows on the system - if you know the class name or the caption, you can figure out which is the right one.
Christian
As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.
Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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What 's a best directX book I can read !
I 'm a beginer of directX
I focus about directMusic & directShow
thanks
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Hi all,
I am new to C++ and I have to say my biggest hurdle is getting my head around what operations I can do with the various var types. It seems everytime I try and do anything with a CString I get an error telling my 'can't convert CString to char *' or various errors all along these lines.
Anyway I think I am starting to get there 
I need to extract a substring from a CString.
i.e.
CString = "This is a test string"
say i need to get the word test out and store it in an word array.
I know what position it starts and i know what position it ends, so I of course know how many chars I need.
What should I use to get that word from the CString and stick it in
say word_array[word_count]???
Any pointers are greatly appreciated,
Cheers Dudes,
Tryhard
Down Under
PS - Thanks to all who have replied to my previous posts
esp. C.G. Thanks Dude, very helpfull
Tryhard
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To get a substring out of a CString you can use left, mid, or right. For example, in the above example you could use
CString s = "This is a test string";
CString y = s.Mid(10, 4);
As usual, you can use SetBuffer and ReleaseBuffer in order to get the underlying data if you need to.
Christian
As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.
Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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I WANT TO INSERT A MICROSOFT LISTVIEW6.0 IN MY HTML PAGE,SO I CAN INITIALIZE IT WITH DATABASE DATA,AND I CAN GET USER'S SELECTION,HOW CAN I DO???
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STOP SHOUTING
Christian
As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.
Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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Sorry for shouting,but can you help me?
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Sorry, no. I'm not sure this is the right forum, I doubt it's a C++ question.
Christian
As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.
Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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Hey,
Could any one please tell me any idea on how can i solve this problem. I made a list box in which files can be added and can also be zipped. However, all of this is done in a while loop so the dialog isn't receivng any messages, kind of freezing until the loop is done. I would like to be able to click Cancel but it's not working. I tried inserting this in the middle of the loop:
CWinApp* pApp = AfxGetApp();
MSG msg;
while ( PeekMessage ( &msg, NULL, 0, 0, PM_NOREMOVE ))
pApp->PumpMessage();
but it makes it a lot slower and while the files are being zipped this won't work.
I created a worker thread but the problem is that i need to call functions like:
next = m_files.GetNextItem(next-1 ,LVNI_SELECTED );
which are non static so the compiler will give me an error. It won't work either with GUI thread. Any suggesions on how to fix this?
Thanks alot.
Regards,
Eric
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Pass the HWND of the list control to your worker thread. You can then use the straight APIs to access the list (sending messages is safe between threads in the same process), or make a local CListCtrl variable and attach it to the window handle, if you prefer using CListCtrl methods.
UINT ThreadProc(void* pv)
{
CListCtrl list;
list.Attach ( (HWND) pv );
list.Detach();
return retcode;
}
--Mike--
http://home.inreach.com/mdunn/
Trillian: What are you supposed to do with a manically depressed robot?
Marvin: You think you've got problems. What are you supposed to do if you are a manically depressed robot?
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Hey Michael, thanks a lot for replying. I'll try that. Thanks again.
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How can i read RGB (0...255) data from Bitmap for each pixel?
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Do you mean Bitmap (GDI+) or CBitmap (MFC) or HBITMAP (Win32) ?
MFC has GetPixel/SetPixel. You can select a bitmap into a DC and then use those. If you meant something else, just say.
Christian
As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.
Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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