C / C++ / MFC

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STL valarray usage David Leikis13-Jun-02 10:23 David Leikis 13-Jun-02 10:23  I am attempting to use the valarray STL in an MFC app, but I get a compiler error immediately from within the valarray include. I am copying the code sample provided on MSDN at the following location: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcstdlib/html/vclrf_valarray_pow.asp In particular, the compiler states that "there are not enough parameters in the Min/Max macros"; with just the include file, no code at all! So, MFC can't even build the include! I am trying to build an RMS average function for a number of points and it would be great if I could use the speed optimization built into the valarray. If I build the example code from above within a console app, it works well without any errors and it functions also.... Is there something within MFC that is predefining these macros that interferes with the valarray include? Can this be done as a library function so that I could reference the class that I am attempting to build? Thanks in advance for any help, Dave Leikis Re: STL valarray usage Joaquín M López Muñoz13-Jun-02 12:20 Joaquín M López Muñoz 13-Jun-02 12:20  I guess this is a problem having to do with <windows.h> and the STL headers defining differently min and max. Try #undefining min and max before including the header for valarray. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed? redeemer13-Jun-02 9:20 redeemer 13-Jun-02 9:20  thanks Re: How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed? Ans: you can set the parent window as parent to the dialog or disable te window and enalbe it when the dialog is closed loket13-Jun-02 9:43 loket 13-Jun-02 9:43  . Re: How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed? Ans: you can set the parent window as parent to the dialog or disable te window and enalbe it when the dialog is closed redeemer13-Jun-02 9:39 redeemer 13-Jun-02 9:39  How do i set the parent window as parent to the dialog? In the CreateDialog, i give it a parent window, but i can still use the parent window even when the dialog isn't closed. <b></b> Rama Krishna Vavilala13-Jun-02 10:10 Rama Krishna Vavilala 13-Jun-02 10:10  Now this is turning into a game Re Marc Richarme13-Jun-02 13:13 Marc Richarme 13-Jun-02 13:13  Rama Krishna wrote: Now this is turning into a game Yup.. and that message wasn't easy to reply to. Cheers, Marc Click to see my *real* signature Re: How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed? Tim Smith13-Jun-02 9:43 Tim Smith 13-Jun-02 9:43  thanks Thanks for what? Or are you trying to ask a question? Tim Smith I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk? Re: How do i create a dialog from a resource file where the parent window can't be used untill the dialog has been closed? redeemer13-Jun-02 10:06 redeemer 13-Jun-02 10:06  Thanks for reading my thread. Passing an object from VB to VC++ ActiveX control 13-Jun-02 8:36 13-Jun-02 8:36  Hi, I have a Visual C++ ActiveX control and a VB project who is using it and I would like to know how I can pass an object from the control to VB. The VC++ control "knows" that object from #import but I cannot write it as a parameter type because it's not a COM standard. I have used a VARIANT type to pass the object to the Control from VB and it seems to work, but I just can't figure out how to make it work the other way around. Any help would be appreciated. Thanks, Re: Passing an object from VB to VC++ ActiveX control 13-Jun-02 9:20 13-Jun-02 9:20  O.k. Thanks for nothing. I just figured it out. I just use LPUNKNOWN and then after casting it i copy all the data. Deleting STL list elements moredip13-Jun-02 8:38 moredip 13-Jun-02 8:38  Hi all, So I have a list< double* >, which contains arrays which were created with something like new double[4]. When I'm done with the list I need to free all of the elements. At first I tried this: list< double* > ::iterator it = my_list.begin(); while( it != my_list.end() ) delete [](*it); but that didn't work, with MFC saying the pointer was still valid, I think because the list still contained references to the element. So I figured the best way would be to walk thru the list, removing, then deleting, elements as I go. But I'm a little unsure about the behaviour of iterators in this situation. For example after the following code: list< double* > ::iterator my_it = my_list.begin(); my_list.pop_front(); Would my_it stil be valid? Where would it be pointing to? I need to figure out the quickest way to safely []delete all elements in the list. Any pointers? TIA, Pete Re: Deleting STL list elements moredip13-Jun-02 9:06 moredip 13-Jun-02 9:06  Doh! this code: while( it != my_list.end() ) delete [](*it); should have been: while( it != my_list.end() ) delete [](*it++); I guess I'm too used to good old for loops well, I can now just run thru the list, deleting all the elements, then just delete the list. This is probably the quickest way.... right? Pete Re: Deleting STL list elements Oz Ben Eliezer13-Jun-02 9:09 Oz Ben Eliezer 13-Jun-02 9:09  Try the following: list< double* >::iterator i; while ((i = my_list.begin()) != my_list.end()) { double *p = *i; my_list.pop_front(); delete [] p; } Re: Deleting STL list elements moredip13-Jun-02 9:18 moredip 13-Jun-02 9:18  That looks like it would work, but I'm not sure if it's the quickest way to do it, calling begin() every time... Re: Deleting STL list elements jbarton13-Jun-02 10:20 jbarton 13-Jun-02 10:20  I like to use something like: while ( ! my_list.empty() ) { delete [] my_list.front(); my_list.pop_front(); } Best regards, John Re: Deleting STL list elements moredip13-Jun-02 10:19 moredip 13-Jun-02 10:19  Yeah, that looks nice Do you think it'd be quicker this way... for( i = my_list.size(); i >= 0; i-- ) { delete [] my_list.front(); my_list.pop_front(); } Im guessing the lack of a function call would speed it up, what do you think? Pete Re: Deleting STL list elements jbarton13-Jun-02 10:34 jbarton 13-Jun-02 10:34  The speed difference would be insignificant. The members of list are generally inlined, so don't add any function call overhead. John Re: Deleting STL list elements moredip13-Jun-02 10:40 moredip 13-Jun-02 10:40  >>The speed difference would be insignificant. Whereas the time wasted while I try to understand my 'efficient' function in two weeks would be significant... I think I'll go with your version Thanks John Re: Deleting STL list elements jbarton13-Jun-02 10:56 jbarton 13-Jun-02 10:56  My original reply was written assuming that you can't change the type of the list. If you can change the type of the list, I would do that instead. I would use: list< vector< double > > my_list. Then, when you erase any elements inside the list, the vector will automatically clean up after itself. John Re: Deleting STL list elements moredip13-Jun-02 10:59 moredip 13-Jun-02 10:59  I _could_ change the type, but it would be more [bureaucratic] effort than it's worth. Thanks anyway, Pete Re: Deleting STL list elements Christian Graus13-Jun-02 12:36 Christian Graus 13-Jun-02 12:36  For future reference though, a vector of doubles in a list would have been a much nicer solution. I usually delete pointers if I need to carry them ( because of polymorphism ) using a for_each and a function object that calls delete on everything in my container. Christian I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002 Half the reason people switch away from VB is to find out what actually goes on.. and then like me they find out that they weren't quite as good as they thought - they've been nannied. - Alex, 13 June 2002 Re: Deleting STL list elements Rama Krishna Vavilala13-Jun-02 12:49 Rama Krishna Vavilala 13-Jun-02 12:49  Even I don't see much sense in storing double* instead of double in a vector. It will also cause Heap fragmentation and your code may cause more page faults as each double may be scattered all over the memory. Unless you have very important reason against it, change it to double. Re: Deleting STL list elements moredip13-Jun-02 12:54 moredip 13-Jun-02 12:54  Well, it seems that it would be worth the effort, based on all of your posts. I shall get to it... Thanks for the advice everyone Midi Song Length using MCI (non-MFC) 13-Jun-02 8:08 13-Jun-02 8:08  Hello. This problem has been plaguing me and I can't seem to find an answer. I am programming a Win32 App using the Win32 API. I am using MCI to play a midi and I need to figure out how long the song is. Does anyone know how to do this or can anyone direct me to a resource that would show me? I've tried many things but I just can't seem to figure it out. Thanks in advance.

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