Am using a Dev c++ compiler, to compile a c code. (I am a beginner)
When I compile, it says 'some' header files are missing.
How can i include those header files in my system, so as to be utilized by the program??
Thanks
A header such as <sys/sem.h> which is used for the function semget() among other things, is not generally available in Windows. It's a POSIX header, and Windows does not implement the POSIX standard out of the box.
You should maybe look at the Win32 API instead, for instance a function like CreateSemaphore().
The problem is that you are trying to use the Linux API on Windows. Here is what is going on: Every operating system has its own set of libraries for programmers to use to make programs on that platform. In this instance, you are attempting to use Linux libraries on Windows. Windows doesn't have a code location called sys/ipc or sys/sem.
Furthermore, since you said you are a beginner, try finding another tutorial. sys/ipc.h and sys/sem.h are not for beginners, are are libraries typically used for communication between processes. These concepts are way beyond you right now haha :P
Here is a better place to start: http://www.cprogramming.com/tutorial/c-tutorial.html
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Since this is my first question after years of finding answers in this site, id like to say a big thanks to everyone.
I want to use FANN in an embedded platform, and i am using UVision 4 to code in C.
Since i am a C/C++ rookie, i cant figure out if i can / how i can use that library.
When i try to simply include the files, i get this error:
FANN\fann.h(51): error: #5: cannot open source input file "sys/time.h": No such file or directory
which makes sense because i am not compiling for windows platform.
Can i use the FANN library for embedded C? If so, how to include it?
Thanks
You have to write your own "sys/time.h" for your embedded system. It must offer everything the original one does to be compatible with your external library. Wether you write one from scratch or wrap something around an existing code base which is compatible to your embedded device is up to you.
You can also have a look at this SO question.
If you're not compiling on windows you'll have no problem - simply include sys/time.h like this :
#include <sys/time.h>
Note the < and > character, these will make sure that your header is looked up within $PATH.
If your compiler still wont find that header you will need to install libc, on debian this can be done with tools like apt-get
I'm attempting to compile a sample c file that was given to me, but unfortunately, it's missing several libraries as some of the include files cannot find them. Namely: stropts.h, netdb.h, sys/socket.h, sys/ioctl.h, netinet/in.h, pthread.h, and unistd.h.
I've researched where I could fix these problems, but surprisingly there have been little to no results on this problem strangely. The Visual Studio command prompt isn't able to compile it until I can find these libraries. Anything I need to download/ link to fix this?
Those header files are not part of standard C or C++. Do not attempt to download the headers from other sources; even if you can get them to compile, they won't link properly since you don't have the implementations of the functions declared therein in a static library or DLL.
The simple fact of the matter is that the code you're trying to compile was written for Unix/Unix-like systems and it's not portable to Windows. You'll need to either significantly rewrite the code to use the equivalent Windows functionality or a 3rd-party platform-independent library (e.g. Winsock or Boost sockets for sockets), compile it on a Unix system (you could use a virtual machine if you want), or use a Unix compatibility layer such as Cygwin.
My program is written in C. I want to use library winnt.h, but I don't use Windows anymore.
Seems like a strange question; you should probably clarify which function(s) you actually need from winnt.h so that you can learn the Linux equivalent. winnt.h isn't really a general purpose "library", it's just an interface to built in Windows-specific functions.
With that as a major caveat, you may get some degree of what you want by attempting to run your app with the help of Wine. See http://www.winehq.org/ If you're just trying to run an existing app, that's may be a reasonable solution. If you're trying to make a Linux version of your app, though, that won't help you very much.
No, well you could but it's not going to do any good - the.h file just declares functions that are defined in libs that are only on windows
No. You can't.
winnt.h contains lots of macros that depend on a Windows environment and a lot of function declarations that only exist in Windows-specific libraries. So, it's not really useful (or possible) to use winnt.h on Linux.
That said, you can use Winelib, which includes most of the functionality exposed by those Windows-specific headers, and you can get those features by linking your program with Winelib. In general, this is probably not a good idea, because Winelib is relatively unstable (the functionality of a given API function may be absent, incomplete, buggy, or incompatible compared to the native Windows version). It is a much better idea to look for a Linux-native alternative to what you need.
What parts of winnt.h do you want to use? Of course, if you need some nice macroses or type definitions from it, you can freely copy it to your own header file (of course, with dependencies). But if you include all winnt.h file to your program in linux environment, you will get tons of error messages. One of the reasons for it is pronounced by Martin Beckett in his reply.
I'm attempting to utilize the socket.h functions within Windows. Essentially, I'm currently looking at the sample code at https://beej.us/guide/bgnet/html/multi/clientserver.html#datagram. I understand that socket.h is a Unix function -- is there anyway I can easily emulate that environment while compiling this sample code? Does a different IDE / compiler change anything?
Otherwise, I imagine that I need to utilize a virtualized Linux environment, which may be best anyways as the code will most likely be running in a UNIX environment.
Thanks.
You have two options:
Use Cygwin (Unix emulation library).
Port to Winsock (Windows standard library).
Cygwin: lets you compile your Unix sources mostly untouched, but ties you to the Cygwin emulation library. This have two implications: general performance -no only network- will probably be less than optimal; and the target environment must have (at run time) the Cygwin DLL installed.
Winsock: this requires you to replace sys/socket.h (BSD sockets library, UNIX standard for the TCP/IP stack) with winsock2.h, and rewrite some parts of the code - not much, but some.
Some related questions with valuable info:
Differences between winsock and BSD socket implementations
Some Issues About Cygwin[Linux in Windows] (socket,thread,other programming and shell issues)
Examples for Winsock?
I think you are looking for Winsock library.
Writing cross platform network applications is not easy with what the BSD standard provides you. Sure it will work but you'll have to make some replacements like replacing ioctl (if needed) with ioctlsocket (on windows). More differences here.
My advice is to use a library that hides these ugly differences and provides a unified way of communicating. I personally use ACE. You have plenty of examples that show you how to create a server and a client. Copy from the samples and see how they do it there. Their mailing lists are of great help also (don't forget to use the PRF - see the source tree for the Problem-Report-Form). You can borrow the books for more information. Important note: by using ace you can use ACE wrapper functions like socket, setsockopt, ioctl etc. without worry that they will not work. Unfortunately this adds a library dependency which is not always an option. But ACE has more powerfull features which I'm sure you'll like once you discover them. Hints: Reactor, Proactor.
So, I'm working on some network programming in C, and it would seem that I am missing a bunch of standard C/C++ header files. For example, sys/socket.h is not there. A few otheres are missing too like netdb.h, and unistd.h. Is there a pack I need to install to get these on windows?
Thanks
All these headers are from POSIX, not ANSI C, or ISO C++. You won't find them in Windows without installing some sort of compatibility layer, like Cygwin, or porting your application to Windows API, or use some macros and wrappers to map similar functions (i.e. #define strtok_r strtok_s).
none of those are standard c or c++ headers. On windows, socket definitions are in winsock2.h
you probably won't find it because it is a commonly used linux header file. You can find it in linux-libc-dev, if you really want it.
As others said, you're using the POSIX headers and definitions for Socket. Check out MSDN for the headers and structures that are defined on Windows: http://msdn.microsoft.com/en-us/library/ms740506.aspx. The calls are pretty much the same, but this will give you all the microsoft-specific syntax.