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First thanks a lot JohnGrahm and cas. The tutorial definitely cleared a lot of it up for me (although not sure I understand why it is done this way I will surely concede smart men then me...

Thanks for both replies!! I am a little confused where the default location eclipse is looking then. When I went to the GCC C Linker > Libraries > Libraries (-l) in eclipse all I typed in was...

Thanks to all who have helped. I think that I have found the solution to the issue. As Tater said, there seems to be a library file with a .la extension or maybe the file that has .pc extension. ...

I don't think their are any other files than the 4 header files included that are all .h .
modbus.h
modbus-tcp.h
modbus-rtu.h
modbus-version.h

There are no .o or .lib files

I looked up linking errors. I am confused on what this is because I have provided the file path to the files in question. ( usr/include/modbus ) shows up in my include folder in eclipse for...

Let me preface by saying I am a newbie learning C. I am really pounding my head against the wall. I am using a header file that has a function suchandsuch () when I am calling this function...

Good point Tator and since most of my apps are meant for more embedded platforms I may want to strongly investigate the gui builder and if it is meant for desktop apps may utilize to many resources...

Thanks Anduril462,
I will take a look at what sockets are and if they can reasonably be used to do what I am wanting to do. If you have any good resource sites I can look-up I would be all ears. ...

Thank you for the advice Tator. The systems I design generally are performing only 1 task and really won't be meant for multiple applications so to speak. Any application besides the main app...

Just to make sure we are on the same page. The communication would be from the gui application to the c application running on the same processor

So by your post it seems like it is not so difficult to get a JAVA gui to "talk" to the main c app?

Thanks
I did not see the reply before posting. Should have refreshed!!

Thanks for the response. Not counting OSX would you say that an ANSI C application should work (possibly with minor tweaks) for Linux and Windows? If the answer is yes then why couldn't I build say a...

I appreciate the reply. I am used to programming without an OS (common in industrial environments with dedicated processors to specific tasks) so I am sorry if my question was not stated properly....

I appreciate any advice. I have been programming HMI's and PLC's for a while. I was about to switch to c-programming for portability when I started researching and have not found many gui builders. I...