C++ on Ubuntu

orrt · 03-23-2010, 12:19 AM

Hi everyone,

I'm writing a project in which I've defined several variables in a header file, included that header file in the main cpp file and tried to print the values of the defines from the main cpp file. When I do try to print them they get printed if I've run a function which also included the header file. I've shortened the code but it'll still work.

Please find the 3 files below:

Code:

------------------------- main.cpp -------------------------

#include "LinuxHardwareInfo.h"
#include <stdio.h>




int main (int argc, char* argv[]) 
{

printf("\n\n\n\n------------AA----HDD_SERIAL--AA---->> %s", HDD_SERIAL);
printf("\n\n\n\n----A-- ADDRESS OF HDD_SERIAL-A-->> %p\n", HDD_SERIAL );

	createStorageFiles();

printf("\n\n\n\n--------BB--HDD_SERIAL----BB--->> %s", HDD_SERIAL);
printf("\n\n\n\n----B- ADDRESS OF HDD_SERIAL--B-->> %p\n", HDD_SERIAL );

	return 0;
}


------------------------- end of main.cpp -------------------------


----------------------- LinuxHardwareInfo.cpp -----------------------

#include <stdio.h>
#include "LinuxHardwareInfo.h"

void createStorageFiles(void)
{


printf("\n\n\n\n-createStorageFiles- HDD_SERIAL-00->> %s",  HDD_SERIAL);

printf("\n\n\n\ncreateStorageFiles ADDRESS OF H HDD_SERIAL-0->> %p\n",  HDD_SERIAL);


printf("\n\n\n\ncreateStorageFiles- HDD_FIRMWARE-11->> %s",  HDD_FIRMWARE);

printf("\n\n\n\ncreateStorageFiles- ADDRESS OF HDD_FIRMWARE -1->> %p\n",  HDD_FIRMWARE);


printf("\n\n\n\ncreateStorageFiles- HDD_SERIAL_C-22->> %s",  HDD_SERIAL_C);

printf("\n\n\n\n----createStorageFiles--- ADDRESS OF HDD_SERIAL_C------2-->> %p\n",  HDD_SERIAL_C);


}

-------------------- end of LinuxHardwareInfo.cpp -------------------

----------------------- LinuxHardwareInfo.h -----------------------

#ifndef LINUXHARDWAREINFO_H
#define LINUXHARDWAREINFO_H


#define HDD_SERIAL_C "zzz yyy"
#define HDD_SERIAL "Serial Number"
#define HDD_FIRMWARE "nhhhj"
void createStorageFiles(void);

#endif

-------------------- end of LinuxHardwareInfo.h -------------------


-------------------- outputs -------------------

------------AA-------------HDD_SERIAL-----------AA----------------->> 



------A--------- ADDRESS OF HDD_SERIAL-------A----------->> 0x80487c0




---------createStorageFiles--------- HDD_SERIAL-----------00---------------->> Serial Number



----createStorageFiles--- ADDRESS OF H HDD_SERIAL------0---------->> 0x80488ec




---------createStorageFiles--------- HDD_FIRMWARE -----------11---------------->> nhhhj



----createStorageFiles--- ADDRESS OF HDD_FIRMWARE -----1---------->> 0x80489a1




---------createStorageFiles--------- HDD_SERIAL_C-----------22---------------->> zzz yyy



----createStorageFiles--- ADDRESS OF HDD_SERIAL_C------2---------->> 0x8048a51




------------BB-------------HDD_SERIAL-----------BB----------------->> 



------B--------- ADDRESS OF HDD_SERIAL-------B----------->> 0x80487c0\

orrt · 03-23-2010, 12:49 AM

Its ok its working now. I included the "LinuxHardwareInfo.h" file last and it started working. I don't know why but if someone else does I'd really like to know.

grail · 03-23-2010, 02:17 AM

orrt ... not sure why you are having either issue??

I used your code without createStorageFiles(); in the main and remarked out in the header and all worked
swimmingly.
I am also able to put the headers in any order I choose.

orrt · 03-23-2010, 06:14 PM

Quote:

Originally Posted by grail

orrt ... not sure why you are having either issue??

I used your code without createStorageFiles(); in the main and remarked out in the header and all worked
swimmingly.
I am also able to put the headers in any order I choose.

Thanks for the reply and it works on Windows

. I'm running Ubuntu 8.10 and the probelm is back. I really don't know what is wrong. I'm using the GNU C++ compiler and this is my command line:

g++ main.cpp LinuxHardewareInfo.cpp LinuxHardwareInfo.h -o sysinfo

I'm really stumped on this one.

grail · 03-23-2010, 07:54 PM

I did the same on ubuntu 9.10 and as i said it worked fine. Are you getting any error from the compile command you submitted?

Maybe try just: g++ main.cpp LinuxHardewareInfo.cpp

This will produce the old favourite a.out. See how that goes?

orrt · 03-23-2010, 08:16 PM

Quote:

Originally Posted by grail

I did the same on ubuntu 9.10 and as i said it worked fine. Are you getting any error from the compile command you submitted?

Maybe try just: g++ main.cpp LinuxHardewareInfo.cpp

This will produce the old favourite a.out. See how that goes?

Thanks but yes, I tried that but to no avail. I also tried:

g++ LinuxHardwareinfo.h -c

followed by:

g++ main.cpp LinuxHardwareInfo.cpp LinuxHardwreInfo.h.gch -o sysinfo

but it still didn't work.

Interestingly enough it works when I change all references that have anything to do with the HDD_SERIAL define and function to "HDD_SERIALZZ" and "getHDDSerialZZ(...)". I think that there must have been a name clash or something with "HDD_SERIAL".

I would like to investigate this further after the deadline for this particular project has passed. But if there was a nameclash wouldn't the compiler have picked it up?