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I have a dialog based MFC app that uses AfxBeginThread to create five threads from the same class. I can communicate to the main program from each of the five threads with SendMessage. From each of the five threads I know the threadId of the other four threads. What I would like to know is how to have thread one send a message to thread two and so on until thread four sends a message back to thread one. I've used PostThreadMessage to do the above and the return code is OK, but no message shows up. Where are the messages?
Thanks,
Clay
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Are your threads actually processing messages? Do you have a message pump somewhere? Calling PeekMessage/GetMessage?
...if you're under 8 or younger. Chris Maunder, the Lounge
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The class has the following members:
CSupervisor::CSupervisor()
CSupervisor::~CSupervisor()
BOOL CSupervisor::InitInstance()
int CSupervisor::ExitInstance()
int CSupervisor::Run()
BOOL CSupervisor::PreTranslateMessage(MSG* pMsg)
void CSupervisor::OnReceivedCommand(WPARAM wParam, LPARAM lParam)
This is probably where I'm confused on the existance of a message pump?
Clay
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Derived from? CWinThread? Worker thread or user interface thread? Look at the VC Help on CWinThread, this should bring you on the right track soon.
...if you're under 8 or younger. Chris Maunder, the Lounge
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What kind of communication do you want to implement between the threads? For example, do you want to send a notice or data? Does one thread waits for one or more of the other threads between executing a procedure?
Kuphryn
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The thread class is derived from CWinThread and is of user-interface type. Notice, to start with just as a proof of concept for the program. No, the threads do not have to wait, they could be processing other info.
Clay
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As an aside using SendMessage() back to the main thread or another thread is a really bad idea, and could potentially result in a deadlock. Use PostMessage() and if you need synchronization use CEvent's and WaitForSingleObject().
Also read the articles by Mr. Newcomer here at CP about UI Threads etc.
Neville Franks, Author of ED for Windows. www.getsoft.com
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I have a dll, whose main class is derived from COleControlModule. When I try to build the dll, I get a link error:
error LNK2001: unresolved external symbol "public: virtual struct CRuntimeClass * __thiscall CMyDll::GetRuntimeClass(void)const " (?GetRuntimeClass@CMyDll@@UBEPAUCRuntimeClass@@XZ)
Do I need to override & implement the GetRuntimeClass() function? But the function is declared virtual in the CObject class, not virtual funcname() = 0; or something. So as far as I know, I don't need to implement it.
I didn't try to call this function from my own dll anywhere, so I am at a loss to determine why this is happening when in all the other dlls or other projects that I made, I got by without having to think about this function.
Any help or pointers would be appreciated.
Thanks very much.
Regards,
Rohit Sinha
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Do the function signatures match? Implement a dummy that calls the base class implementation.
...if you're under 8 or younger. Chris Maunder, the Lounge
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It turned out I had forgotten to include the IMPLEMENT_DYNAMIC macro in my implementation file.  This was revealed when I tried to follow your suggestion to implement a dummy function. Actually I tried to reimplement the same function to see what happens, and was told that the function was already declared, and on double clicking the error, was taken to the DECALRE_DYNAMIC macro. This was all I needed to have my ears pulled.
Thanks very much. 
Regards,
Rohit Sinha
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I am currently working on a graphical interface for an application designed to recreate a physical model of a ventilation system.
I believe that the tree control in Visual C++ might be useful as a means of modelling a ventilation system, in that ventilation elements in the system could be included as items in the tree, with all the appropriate interconnections.
I am very new to Visual C++ and am fairly unfamiliar with the functionality of the tree control. Is it possible to use it to build your own tree in such a way or is it only used for displaying existing file systems etc. Also could each element in the tree be assigned a particular set of parameters via other interface dialogues? Could these parameters then be used to make mathematical calculations, based on the position of the element within the tree, relative to other elements?
Can anyone suggest other non-MS controls which may be useful?
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the tree control is a general purpose control designed for displaying hierarchical data ... you can do whatever you want with it as far as what it shows is concerned ... detecting clicks on items and position within the tree is easy to do and i guess you could use the position to perform calcs
"... and so i said to him ... if it don't dance (or code) and you can't eat it either f**k it or throw it away"
biz stuff about me
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thank you, Lauren that's good news.
Do you know a good place to find information on the functions used by the tree control or tutorials on how to use it?
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look in msdn ... search for CTreeCtrl
"... and so i said to him ... if it don't dance (or code) and you can't eat it either f**k it or throw it away"
biz stuff about me
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Also, be sure to look here
Shog9
------
If you really what to get shitfacde tell a crowded bar that is is yourt borthday and hife your wallet. you ka will many more friends.
- David Wulff, Brithday selebrations, 9/19/02
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Even if you go this route, you might want to consider people that will be suing the application, and weather or not they will be able to equate the treeview model to the bransvhing out of ducts. The treeview kind of forces everything into a left-justified list model and I could see where that might confuse people that are used to looking at ductwork that flows in a wider range of motion.
Depending upon the intent of your application you might want to go to another type of control, one that is more two-dimensional, or at very least give the user a small line drawn map to indicate where they are in the schematic when they click on part of the treeview.
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Ray Cassick wrote:
people that will be suing
I hope this doesn't happen.
Tree's don't have to be like the MS Tree control. One that isn't which I'm very impressed with is: http://www.teemach.com/products/teetree/tree%20galery.htm[^]
There are many Graph components around, which may be a better route to head down for this application.
Neville Franks, Author of ED for Windows. www.getsoft.com
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Neville Franks wrote:
I hope this doesn't happen.
Darn spelling
That is a great link by the way.. I really did not know that you could do so many things with the tree control...
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Is it possible to embeed a CHtmlView into a dialog so that I can show html pages that I load from disk. If you can't put a CHtmlView into a dialog is there another way to do it?
Thanks in advance.
- monrobot13
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u can :
http://www.microsoft.com/msj/0100/c++/c++0100.asp
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Thanks much for the info!
- monrobot13
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Hi,
I'm trying to use Embedded VC++ 3.0, with the Pocket Pc Emulator, I can generate a typical Hello World application, and it goes fine but...
I want to download a file to the emulator and read it, I have used the "remote file viewer", it seems that the file is copied where I want, but when I'm going to read the file from my application, it gives me one error, like "it doesn't exists", should I write the full path from my computer, or the pocket Pc one ?
Another problem, comes with the S309PictureBox, I need to display a jpg image on my application, but it's impossible to register that OCX... any clue, or alternative way of doing that ?
I have tried to install EVC++ 4.0... but I get no connection with the emulator  (((
Thanks in advance for your help, greetings
Braulio
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Hi,
I need to use CoInitializeEx. It's definition is in objbase.h, and wrapped in a preproc directive...
#if (_WIN32_WINNT >= 0x0400 ) || defined(_WIN32_DCOM) // DCOM
I cannot find info in _WIN32_WINNT anywhere in MSDN, or on this site. Am I meant to define this manually myself? Or it it defined elsewhere?
Thanks
Jon
Signature space for rent. Apply by email to....
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You define it yourself to specify which version of winnt you are targeting.
0x0400 = NT4
0x0500 = W2k
0x0501 = XP
PS: I think it defaults to the WINVER setting
...if you're under 8 or younger. Chris Maunder, the Lounge
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This is a macro used to target your app for specific platforms depending on the value. By default, Win NT 3.51 is targeted. If you want to target a version of NT greater than that, you need to define it.
_WIN32_WINNT = 0x0400 => NT 4
_WIN32_WINNT = 0x0500 => Win2k
_WIN32_WINNT = 0x0600 => Win XP (??? not sure here)
You can define the value in StdAfx.h, or at the top of the file which includes the required header file. But then you'll have to remember which files you defined them, and remember to update each of them if your target platform changes, so it's better to do it in StdAfx.h.
Regards,
Rohit Sinha
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