C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  class library in c++ Goto page 1, 2  Next          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message pooja Guest Posted: Thu Sep 29, 2005 11:40 am    Post subject: class library in c++ what is a class library and how does it different from c++ header file? Back to top EventHelix.com Guest Posted: Thu Sep 29, 2005 11:53 am    Post subject: Re: class library in c++ In general, a class library would consist of several header files and the associated source files. -- EventStudio System Designer 2.5 - http://www.EventHelix.com/EventStudio Sequence Diagram Based System Design and Modeling Tool Back to top pooja Guest Posted: Fri Sep 30, 2005 9:30 am    Post subject: Re: class library in c++ thanks. Tell me one more thing , that how can I hide my header files and other source file in a class library, so that my client would not be able to open it and can not tamper the classes with in it. Back to top EventHelix.com Guest Posted: Fri Sep 30, 2005 12:08 pm    Post subject: Re: class library in c++ Search Google for "c++ code obfuscator". For source files, you could just ship the object files. -- EventStudio System Designer 2.5 - http://www.EventHelix.com/EventStudio Sequence Diagram Based System Design and Modeling Tool Back to top E. Robert Tisdale Guest Posted: Fri Sep 30, 2005 3:51 pm    Post subject: Re: class library in c++ pooja wrote: Quote: Tell me one more thing, "How can I hide my header files and other source file in a class library so that my client would not be able to open it and can not tamper the classes with in it?" You can't. You *must* distribute the header files which define the public interface for the library. Developers who distribute proprietary libraries distribute object files in library archives and *not* the source files which define the implementation. You can do this too if you can compile your library for every target platform. Back to top pooja Guest Posted: Sat Oct 01, 2005 11:08 am    Post subject: Re: class library in c++ how can I distribute the header files which define the public interface for the library.? how does Developers distribute proprietary libraries distribute object files in library archives and *not* the source files which define the implementation. Tell me the code snippet for it. also teel me the site from where i can get the information Back to top John Harrison Guest Posted: Sat Oct 01, 2005 12:29 pm    Post subject: Re: class library in c++ pooja wrote: Quote: how can I distribute the header files which define the public interface for the library.? how does Developers distribute proprietary libraries distribute object files in library archives and *not* the source files which define the implementation. That depends on your toolset. For instance on Unix you might use the 'ar' command. With Microsoft VC++ you might use the 'lib' command. Quote: Tell me the code snippet for it. also teel me the site from where i can get the information There is no code snippet. You just write the code as normal, make a library from it. Then send the library and the header files to whoever wants to use the library. You get the information by reading the documentation that comes with your compiler and other tools. john Back to top pooja Guest Posted: Mon Oct 03, 2005 6:09 am    Post subject: Re: class library in c++ Can we develop library files and header files in a way so that it can not be tampered by the programmers by using Turbo C and Borland C compiler? Back to top Kai-Uwe Bux Guest Posted: Mon Oct 03, 2005 7:10 am    Post subject: Re: class library in c++ pooja wrote: Quote: Can we develop library files and header files in a way so that it can not be tampered by the programmers by using Turbo C and Borland C compiler? The library file is compiled already. Without access to the sources, your customers will not be inclined to change. (The obvious path of changing a library file is to recompile the source. This path is blocked if your keep the source. Non-obvious paths of changing the binary exist, but the few who can do that, you cannot stop.) As for the headers, your customers would not use the compiler to "tamper" with the header. They would just use their favorite text editor and change it. More likely, however, they would create a different version and then include their file rather than yours. Nothing forces a user to tell the compiler about your header just because he intends to tell the linker about your library. The compiler has no premonitions, it simply does not know about the linker. Also, why would that be of your concern? Keep in mind that, since their version still would have to match the library file, they cannot really depart very much. However, they could put certain identifiers into a different namespace. Actually, your customers might have a very legitimate reason for doing exactly that: it could be the only way to avoid conflicts arising from the use of several libraries. Best Kai-Uwe Bux Back to top pooja Guest Posted: Mon Oct 03, 2005 9:11 am    Post subject: Re: class library in c++ Ok thanks , but still some confussion is there suppose I have created a file "abcd.h" like this //abcd.h #inlcude<iostream.h> class c1 { public: void sum() { cout<<"I am sum function"; } }; now I created another file "file1.cpp" , in which I included this "abcd.h" file. //file1.cpp #include"abcd.h" void main() { c1 obj; obj.sum(); } I want that my customer would also use "abcd.h" header file as I am using it in the above file1.cpp. Tell me how should I distribute "abcd.h" to my programmer using TC as a compiler. Can I Simply copy it on a CD and hand it to the customer or so some other steps are there? Back to top Karl Heinz Buchegger Guest Posted: Mon Oct 03, 2005 11:17 am    Post subject: Re: class library in c++ pooja wrote: Quote: Ok thanks , but still some confussion is there suppose I have created a file "abcd.h" like this //abcd.h #inlcude class c1 { public: void sum() { cout<<"I am sum function"; } }; now I created another file "file1.cpp" , in which I included this "abcd.h" file. //file1.cpp #include"abcd.h" void main() { c1 obj; obj.sum(); } I want that my customer would also use "abcd.h" header file as I am using it in the above file1.cpp. Tell me how should I distribute "abcd.h" to my programmer using TC as a compiler. Can I Simply copy it on a CD and hand it to the customer or so some other steps are there? In this case: copy it to the CD and you are fine. -- Karl Heinz Buchegger [email]kbuchegg (AT) gascad (DOT) at[/email] Back to top pooja Guest Posted: Mon Oct 03, 2005 12:08 pm    Post subject: Re: class library in c++ "In this case: copy it to the CD and you are fine. " and what would be the other case? How to create a header file and packaged it , so that my customer would not be able to the see the functions and their implementation? Back to top Karl Heinz Buchegger Guest Posted: Mon Oct 03, 2005 2:58 pm    Post subject: Re: class library in c++ pooja wrote: Quote: "In this case: copy it to the CD and you are fine. " and what would be the other case? The other case would be to have no function implementations in the header file :-) Quote: How to create a header file and packaged it , so that my customer would not be able to the see the functions and their implementation? Your case was: #inlcude<iostream.h> class c1 { public: void sum() { cout<<"I am sum function"; } }; and you want to ship that to your customer. But this is not the likaly case. You may have some functions the user can see, but this is not the usual case. The much more usual case would be this: abcd.h ****** #ifndef ABCD_H_ #define ABCD_H_ class c1 { public: void sum(); }; #endif abcd.cpp ******** #include #include <abcd.h> void c1::sum() { std::cout << "I am sum function"; } Now you compiler abcd.cpp with the compiler of your choice (and most always needs to be the same compiler your customer uses). If there are more then 1 cpp files, you will want to collect all those object files (the results of all the individual compiler runs) into a library. You then ship to your customer: * the header file he needs (abcd.h in the above example) * the object file (or the library) Now you customer writes: #include "abcd.h" // that is why he needs to have the header file int main() { c1 obj; obj.sum(); } and links it with the object file (or the library) you provide. Things to note: * You have to supply the header file, because your customer needs it * Whatever you write in the header file is visible to your customer. Thus you may want to reduce this to a minimum. This is eg. why I moved the implementation from abcd.h into another file which gets compiled and shipped in its compiled form. * Depending on your platform and/or compiler you might be forced to compile the library for different platforms/compilers and ship a customized version to your customer. -- Karl Heinz Buchegger [email]kbuchegg (AT) gascad (DOT) at[/email] Back to top pooja Guest Posted: Tue Oct 04, 2005 6:23 am    Post subject: Re: class library in c++ Thank you so much. I am really thank full to you for solving my problem so nicely and so beautifully. Karl Heinz Buchegger wrote: Quote: pooja wrote: "In this case: copy it to the CD and you are fine. " and what would be the other case? The other case would be to have no function implementations in the header file :-) How to create a header file and packaged it , so that my customer would not be able to the see the functions and their implementation? Your case was: #inlcude class c1 { public: void sum() { cout<<"I am sum function"; } }; and you want to ship that to your customer. But this is not the likaly case. You may have some functions the user can see, but this is not the usual case. The much more usual case would be this: abcd.h ****** #ifndef ABCD_H_ #define ABCD_H_ class c1 { public: void sum(); }; #endif abcd.cpp ******** #include #include void c1::sum() { std::cout << "I am sum function"; } Now you compiler abcd.cpp with the compiler of your choice (and most always needs to be the same compiler your customer uses). If there are more then 1 cpp files, you will want to collect all those object files (the results of all the individual compiler runs) into a library. You then ship to your customer: * the header file he needs (abcd.h in the above example) * the object file (or the library) Now you customer writes: #include "abcd.h" // that is why he needs to have the header file int main() { c1 obj; obj.sum(); } and links it with the object file (or the library) you provide. Things to note: * You have to supply the header file, because your customer needs it * Whatever you write in the header file is visible to your customer. Thus you may want to reduce this to a minimum. This is eg. why I moved the implementation from abcd.h into another file which gets compiled and shipped in its compiled form. * Depending on your platform and/or compiler you might be forced to compile the library for different platforms/compilers and ship a customized version to your customer. -- Karl Heinz Buchegger [email]kbuchegg (AT) gascad (DOT) at[/email] Back to top pooja Guest Posted: Tue Oct 04, 2005 7:56 am    Post subject: Re: class library in c++ Thanks for clearing my doubts. But there is a problem , that when I execute this code, at run time the compiler shows an error message " undefined symbol c1::sum() in module file1.cpp." I have copied abcd.obj, abcd.h and file1.cpp(in which I have written thye main()) in TCTEMP folder, and in this folder all other necessary libraries, header files are present. So why it is showing this error message? How to solve this problem. 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