C / C++ / MFC

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Re: create many dialogboxes and the amin window is still responsive Stuart Dootson21-Dec-08 2:20 Stuart Dootson 21-Dec-08 2:20  Modeless dialogs[^] are what you want. Re: create many dialogboxes and the amin window is still responsive Mustapha Rédouane21-Dec-08 22:16 Mustapha Rédouane 21-Dec-08 22:16  Thank's bro, that's it, it works now.. Using MFC's socket within the Process' threads AmitCohen22220-Dec-08 23:40 AmitCohen222 20-Dec-08 23:40  Hi all ! I'm using the MFC sockets mechanism for TCP\IP communication (CSocket, Srialization ability etc.) in a Process that spawns some threads. It works fine until I deliver the socket pointer to one of the threads created by this process so that it can use it to send messages through this socket too - the application then fails, and if I understand correctly it is since the only thread allowed to use this socket is the one created it (in my case the main process). I'm looking for an elegant solution to this limitation (I can go around the problem in several ways but it might affect the complexity and run-time of the program). Any suggestions ??? Thanks in advanced, Amit Re: Using MFC's socket within the Process' threads CPallini21-Dec-08 0:05 CPallini 21-Dec-08 0:05  You secondary thread may possibly post messages to the primary one and let the latter do socket processing. 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] Re: Using MFC's socket within the Process' threads Mark Salsbery21-Dec-08 5:19 Mark Salsbery 21-Dec-08 5:19  ...or you can stop using CSocket (it's really only a useful class for the most basic socket application) and use CAsyncSocket instead. If you'll be using the same socket from different threads, you'll want to use events instead of window messages for socket notifications. Mark Mark Salsbery Microsoft MVP - Visual C++ Re: Using MFC's socket within the Process' threads L. Madhavan21-Dec-08 18:50 L. Madhavan 21-Dec-08 18:50  AmitCohen222 wrote: if I understand correctly it is since the only thread allowed to use this socket is the one created it Not exactly, it's got to do with a bug in MFC. See knowledge base Q193101[^] - I had a similar problem and calling AfxSocketInit() in each thread fixed it. Re: Using MFC's socket within the Process' threads Mike O'Neill22-Dec-08 13:25 Mike O'Neill 22-Dec-08 13:25  That bug appears only when linking statically, and is probably not the cause of the problem. For a solution on using a CSocket object in a thread different from the thread that created it, see "How to pass a socket connection between threads in an MFC application in Visual C++" at http://support.microsoft.com/kb/175668[^]. Basically, you need surround the thread hand-off with calls to CAsyncSocket::Detach() and CAsyncSocket::Attach(). Mike Re: Using MFC's socket within the Process' threads L. Madhavan22-Dec-08 19:03 L. Madhavan 22-Dec-08 19:03  Oh yes, I missed that point. You do need to detach the original socket. help me to describe this code plese auralius manurung20-Dec-08 22:02 auralius manurung 20-Dec-08 22:02  plz help me with this code... <br /> int a = 0;<br /> int p = 2;<br /> int q = 3; <br /> <br /> a += p ? q : 0;<br /> what does the last line mean? i need to describe it into normal if-then-else form... thanks all... From Indonesia with love..!! Re: help me to describe this code plese Garth J Lancaster20-Dec-08 22:54 Garth J Lancaster 20-Dec-08 22:54  the form p ? q : 0 is expr1 ? expr2 : expr3 means evaluate expr1. If it is not zero, the value of the whole thing is expr2; otherwise the value is expr3. so, substituting 0 += 2 ? 3 : 0 since 2 ! = 0 0 += 3 a = 3 ... 'g' Re: help me to describe this code plese CPallini20-Dec-08 23:34 CPallini 20-Dec-08 23:34  The code maybe translated into (see documentation [^]): if ( p != 0 ) { a = a + q; } BTW you really need a good C/C++ tutorial. 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] Re: help me to describe this code plese auralius manurung21-Dec-08 2:28 auralius manurung 21-Dec-08 2:28  yaa... you may be right... thank to you guys for the help... From Indonesia with love..!! ListCtrl AticAtac20-Dec-08 14:00 AticAtac 20-Dec-08 14:00  Hi, i am using CListCtrl in Icon-mode. I am setting the item positions manually with ListView_SetItemPosition32(). I am having a strange bug, y-positions between 0xf000 and 0xffff are not set properly ! Is this a known bug or am i doing something wrong ? Re: ListCtrl CPallini20-Dec-08 22:53 CPallini 20-Dec-08 22:53  Could you please post the relevant code? 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] Re: ListCtrl AticAtac24-Dec-08 10:06 AticAtac 24-Dec-08 10:06  The code is pretty easy, i did this inside my CListCtrl class: ... ListView_SetItemPosition32(this->m_hWnd, 0, 0, 0xf100); POINT p; GetItemPosition(0, &p); ... and you will see that p doesn't contain the values i set before! Re: ListCtrl Hamid_RT21-Dec-08 4:44 Hamid_RT 21-Dec-08 4:44  Did you use of debugger? Of one Essence is the human race thus has Creation put the base One Limb impacted is sufficient For all Others to feel the Mace (Saadi ) Re: ListCtrl AticAtac24-Dec-08 10:08 AticAtac 24-Dec-08 10:08  Debugger doesn't help much, because the item-position is sent via SendMessage to ListCtrl. So its something going wrong inside windows api and not a fault of mfc. CBitmap CreateBitmapIndirect() fails Vaclav_20-Dec-08 13:09 Vaclav_ 20-Dec-08 13:09  This simple code fails and there is no extended error message. The BITMAP data is there and correct. CBitmap *bmp = new CBitmap(); if(!bmp-&gt;CreateBitmapIndirect((BITMAP * ) m_Doc-&gt;m_lpBi)) { ..... PS Ignore -&gt; it is "->" in original!!! Any constructive suggestion on how to debug this is appreciated. Thanks for reading. Cheers Vaclav Re: CBitmap CreateBitmapIndirect() fails Stuart Dootson20-Dec-08 13:19 Stuart Dootson 20-Dec-08 13:19  Did you install the CRT and MFC source code? If so, you can step into the MFC implementation code (so long as you're working with a Debug build) and find what Win32 call is failing. That might give you some more information. Only thing I can think of, apart maybe from finding some sample code, to see if there's anything you're missing? Re: CBitmap CreateBitmapIndirect() fails Vaclav_20-Dec-08 15:21 Vaclav_ 20-Dec-08 15:21  This fails in otherwise working MFC document / view program. And no I cannot step into the API. Thanks Re: CBitmap CreateBitmapIndirect() fails Jijo.Raj20-Dec-08 15:33 Jijo.Raj 20-Dec-08 15:33  May be GetLastError() can give you some hints. Just add @err,hr to the watch window to get the last error description. Regards, Jijo. _____________________________________________________ http://weseetips.com[^] Visual C++ tips and tricks. Updated daily. Re: CBitmap CreateBitmapIndirect() fails Mark Salsbery21-Dec-08 5:24 Mark Salsbery 21-Dec-08 5:24  Vaclav_Sal wrote: if(!bmp->CreateBitmapIndirect((BITMAP * ) m_Doc->m_lpBi)) I'm suspicious about that cast - why did you need to cast to a BITMAP*? Based on the limited info, I have a feeling you're not passing the correct structure... Mark Mark Salsbery Microsoft MVP - Visual C++ Re: CBitmap CreateBitmapIndirect() fails Vaclav_21-Dec-08 6:06 Vaclav_ 21-Dec-08 6:06  Mark, As always, you are correct! BITMAP and BITMAPINFO are definitely different! Here is my wrong code if(!m_lpBmpInfo) { m_lpBmpInfo = (BITMAPINFO *)( new char[m_vfs]); ((LPBITMAPINFOHEADER)m_lpBmpInfo)-&amp;gt;biSize = sizeof BITMAPINFOHEADER; } VERIFY(m_lpBmpInfo); // document bitmap header pointer initialization - do only once in the class if(!pDocument-&amp;gt;m_lpBi) { pDocument-&amp;gt;m_lpBi = (BITMAP *)( new char[m_vfs]); ((LPBITMAPINFOHEADER)pDocument-&amp;gt;m_lpBi)-&amp;gt;biSize = sizeof BITMAPINFOHEADER; } VERIFY(pDocument-&amp;gt;m_lpBi); As always - the de-reference symbol is shown as -&amp;gt; should be "->" Now I need to figure out what data is missing from BITMAP. Should be easy. Thanks Mark Have a great holidays. Vaclav Re: CBitmap CreateBitmapIndirect() fails Mark Salsbery22-Dec-08 6:46 Mark Salsbery 22-Dec-08 6:46  If you need a HBITMAP from a BITMAPINFO or BITMAPINFOHEADER, you may want to look into CreateDIBitmap() or CreateDIBSection(). Mark Mark Salsbery Microsoft MVP - Visual C++ C2244 and inheritance error mjackson1120-Dec-08 10:01 mjackson11 20-Dec-08 10:01  I have a simple base class that holds id's for use in sorting other classes. It is a non-templated class in an single hpp file ( indexedObject, see below ) class indexedObject { public: indexedObject() : _mID(BAD_DB_ID) {} indexedObject(dbID id) : _mID(id) {} ~indexedObject(); dbID getID(void); void setID(dbID id); bool operator&lt;(const dbID&amp; param) const; bool operator&gt;(const dbID&amp; param) const; bool operator==(const dbID&amp; param) const; bool operator!=(const dbID&amp; param) const; protected: dbID _mID; }; // indexedObject inline indexedObject::~indexedObject() { _mID = BAD_DB_ID; } inline dbID indexedObject::getID(void) { return _mID; } inline void indexedObject::setID(dbID id) { _mID = id; } inline bool indexedObject::operator&lt;(const dbID&amp; param) const { return (_mID &lt; param); } inline bool indexedObject::operator&gt;(const dbID&amp; param) const { return (_mID &gt; param); } inline bool indexedObject::operator==(const dbID&amp; param) const { return (_mID == param); } inline bool indexedObject::operator!=(const dbID&amp; param) const { return (_mID != param); } I have a templated class that inherits from the base class. template <class _Ty> class fwdCurve : public indexedObject, public broadCaster { blah blah... } When I try to define setID in the derived class template<class _Ty> void fwdCurve<_Ty>::setID(dbID id) I get a C2244: indexedObject::setID : unable to match function definition to an existing declaration I am able to work around this by declaring setID() in the derived class definition and explicitly calling the base class method but why is this happening? I have VS 2005 with SP1 and hotfix KB930859 installed.

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