January 2004 - openSUSE Programming - openSUSE Mailing Lists

SuSE-9.0 /usr/include/wx/html/htmlproc.h left out of wxGTK-devel package
by Mark Gray 07 Jan '04

07 Jan '04

Since feedback(a)suse.com no longer exists, and I cannot use feedback.cgi from my shell account, I thought I ought to report this here in hopes someone from SuSE might see it. While this might not be the only bug in wxGTK-devel (I am still working my way through the samples) /usr/include/wx/html/htmlproc.h is not packaged up to be installed in the wxGTK-devel package (which causes html/test/test.cpp to fail to compile) Copying htmlproc.h from the source package to /usr/include/wx/html/ fixes the problem. (wxGTK is a fast, very powerful and beautiful collection of widgets by the way.)

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Re: (C++) Saving / reading structures to / from disk
by Ged 07 Jan '04

07 Jan '04

Hi Davi, I understand what you mean. however this also gives the same output file as before. My main problem is getting the data back into the program after I have exited and restarted. This is what I have been stuck with for the past few days. I'm beginning to think its not possible (although I know it is) as nobody, including experienced coders on c++ forums seems to be able to get it to work. If you get a second, could you compile the code and run the program, you'll see what I mean. Thanks, Ged. On Tuesday 06 January 2004 19:32, davicastro(a)terra.com.br wrote: > The main error is at: > > void save_data(StockItem * tosave) > .... > fout.write((char *) &tosave, sizeof(tosave)); > > sizeof(tosave) is the same of sizeof(StockItem *), and probably 4 bytes. > Furthermore, you should not use the & before tosave, since it is already > a pointer (array). The same mistake occurs in the load code. > If you want to store a C array you should also store its size (and also > pass it as argument to others functions). If you want to fix this code, you > should read some more about C pointers and arrays until everything get > clear. Then it will be straightforward. > > []s > Davi > -=SuSE Linux 9.0=-

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Someone tell me
by bruno berisso summers 07 Jan '04

07 Jan '04

where I can reed a good guie about programing in UNIX? Thankes and sorry about mi inglish _________________________________________________________________ Charla con tus amigos en línea mediante MSN Messenger: http://messenger.latino.msn.com/

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emacs starts faster than qt "Hello World!" -- Does anyone use wxGTK?
by Mark Gray 06 Jan '04

06 Jan '04

The good news with SuSE-9.0 is that emacs starts almost instantly once you remove unneeded startup files from site-lib (my compliments to GNU and SuSE). The bad news is that qt applications start up slower with every release -- the example "Hello World!" takes 5-10 seconds to start. I just got through compiling the examples for the wxGTK c++, library, and I am thoroughly impressed with how fast they start. Does anyone on this list use wxGTK in "real" world applications?

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(C++) Saving / reading structures to / from disk
by ged.suse＠ntlworld.com 05 Jan '04

05 Jan '04

Hi all, I hate to ask like this as I normally like to work things out for myself, but I am running out of ideas....and hair !!! I am writing a stock inventory program using structures. The program data is initially populated by hand, and then there is an option to save the array of structures to disk. If the program is exited, the data will need to be inserted back into the program, hence the load function. My main problem is, I can't get these 2 functions to work. I have been working on this section for nearly 3 days now, and do not seem to be getting anywhere. I do not know any programmers to ask for help, so am relying on forums, but I have only been programming for about 2-3 months, so its difficult to implement what advise people give you. The program compiles, and I think the problem may lie in the way the data is being passed to the functions, but I am not experienced enough yet to solve it. Would anyone be able to get these functions working for me please. I have a lot more code to put into this program, but I can't move on until this part is complete. Like I said, I would not normally ask like this, but I am running out of options. Thanks to anyone who can help me, my code so far is as follows: #include <iostream> #include <fstream> using namespace std; struct StockItem { int code; char desc[20]; float price; } stock[125]; /*struct bill_line { StockItem product; float weight; float cost; }; struct bill { bill_line items[20]; int num_lines; };*/ void disp_menu(void); struct StockItem enter_data(); void see_stock(StockItem stock[125], int num_items); void save_data(StockItem * tosave); StockItem *load_data(StockItem toload[]); int main() { //StockItem stock[125]; int ans; int num_items = 0; do { do { disp_menu(); cin >> ans; } while((ans < 1) || (ans > 6)); switch (ans) { case 1: stock[num_items] = enter_data(); num_items++; break; case 2: see_stock(stock, num_items); break; case 3: save_data(stock[ctr]); break; case 4: { //StockItem temp[125]; StockItem *eerrmm = load_data(stock); break; } default: break; } } while(ans != 5); return 0; } void disp_menu() { cout << "\n*** The Corner Shop ***\n\n"; cout << "Select an option: \n\n"; cout << "\t1. Enter new stock " << endl; cout << "\t2. See current stock " << endl; cout << "\t3. Save stock to disk " << endl; cout << "\t4. Load stock from disk " << endl; cout << "\t5. Exit \n" << endl; cout << "option> "; } StockItem enter_data() { StockItem stock_item; cout << "\n\nWhat is the product code: "; cin >> stock_item.code; cout << "What is the product description: "; fflush(stdin); cin.getline(stock_item.desc, 20); cout << "What is the product price: "; cin >> stock_item.price; return (stock_item); } void see_stock(StockItem stock[125], int num_items) { int ctr; char ret; cout << "\n\nHere is the stock listing:\n\n"; for(ctr = 0; ctr < num_items; ++ctr) { cout << "Item " << ctr + 1 << endl; cout << "Product Code: " << stock[ctr].code << endl; cout << "Product Description: " << stock[ctr].desc << endl; cout << "Price: " << stock[ctr].price << endl; cout << "------------------------------------------------\n"; } cout << "Press any key to return to the menu"; if(cin >> ret) return; } //Problem sections void save_data(StockItem * tosave) { ofstream fout("items.txt", ios::binary); if(!fout) { cout << "\n*** Error opening file ***\n"; } fout.write((char *) &tosave, sizeof(tosave)); fout.close(); } StockItem *load_data(StockItem * toload) { ifstream fin("items.txt", ios::binary); if(!fin) { cout << "\n*** Error opening file ***\n"; } fin.read((char *) &toload, sizeof(toload)); fin.close(); cout << toload; return toload; } ----------------------------------------- Email provided by http://www.ntlhome.com/

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any resource for Linux C++
by Ivan Sergio Borgonovo 04 Jan '04

04 Jan '04

I need to learn how to deal with threads, daemons and redirection in C++. I'll surely have to learn more about *nix particularly Linux and C++. I'm expecially looking for simple code samples and libraries. A framework of a multi threaded C++ daemon will be a perfect starting. With the exception of http://www.boost.org/ I didn't find anything interesting. Also any pointer to C++ and Linux mailing lists will be welcome. THX

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A good book on C programming?
by Gavin Henry 02 Jan '04

02 Jan '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, During my degree, BEng (Hons) Electronics and Communications Engineering, we did C programming every year, but I never kept it up, as I had no interest and didn't see the point. But now I really want to get back into it as I see a point with GNU/Linux. I want to get my old skills back and write something or help on some projects etc. I need some good books. I used to have one called "A Book On C", but sold it, and I have been reading various tutorials on the web and the many devoted websites. Anyone have any recommendations? One more question, should I go for C or C++? Which will benefit me more with GNU/Linux? Thanks for your time, Gavin. - -- Regards http://www.magicfx.co.uk http://www.suretecsystems.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/7e1UgNqd7Kng8UoRAqnYAKDWL9XQcMVkiUpLJheJQbx5nHDT/ACgzCM9 BCo4TWvJOFuyj9r815nIv50= =x9hf -----END PGP SIGNATURE-----

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Re: [suse-programming-e] SuSE-9.0 gcc-3.3.1 optimization turns off important warning
by Mark Gray 01 Jan '04

01 Jan '04

Marcus Meissner <meissner(a)suse.de> writes: > On Wed, Dec 31, 2003 at 09:22:36AM -0500, Mark Gray wrote: [snip] >> It is the toupper that turns it off then: >> >> markgray@soyo:/usr/src/packages/BUILD/bug> cat xx.c >> #include <ctype.h> >> >> void strupr_OLD (char *s) >> { >> while (*s) { >> *s++ = toupper(*s); >> } >> } >> >> markgray@soyo:/usr/src/packages/BUILD/bug> gcc -O2 -Wall -c xx.c >> markgray@soyo:/usr/src/packages/BUILD/bug> >> >> (This is also 9.0 btw) > Hmm. Probably because *s++ = toupper(*s); is translated by a macro to: > > *s++ = (__extension__ ({ int __res; if (sizeof (*s) > 1) { if (__builtin_constant_p (*s)) { int __c = (*s); __res = __c < -128 || __c > 255 ? __c : (*__ctype_toupper_loc ())[__c]; } else __res = toupper (*s); } else __res = (*__ctype_toupper_loc ())[(int) (*s)]; __res; })); > > Might be to hard for the compiler to spot the problem. As an assembly language programmer, I find it highly amusing that such a macro generates so few machine instructions :-)

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