Object files linking error

[joekibz]

Problem:

I have an MFC application .

It compiles OK but whenever i build it i get numerous link errors telling me that the functions defined have already been defined in the .obj files .

What is the problem?

 

[ArkM]

numerous link errors: for example?...

 

[Salem]

Sounds like you have code in header files, and have included those header files in several source files (and thus now have multiple copies of the functions).



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[joekibz]

Salem's reply :

Sounds like you have code in header files, and have included those header files in several source files (and thus now have multiple copies of the functions).

joekibz:

Yeah , its an MFC dialog application with several child dialogs . There is one main header file which i have included in in most of the dialogs .
Question:
How would you recommend i go about troubleshooting this problem ?

 

[ArkM]

Start from the beginning, present examples of diagnostic messages...

 

[cpjust]

Does your header file have #ifndef guard statements?
Ex:

#ifndef MY_WONDERFUL_HEADER_INCLUDED
#define MY_WONDERFUL_HEADER_INCLUDED

// Put all the header stuff here...

#endif // MY_WONDERFUL_HEADER_INCLUDED

 

[joekibz]

ArkM here are some of the messages ...

error LNK2005: "struct pcap_if * hegre" (?hegre@@3PAUpcap_if@@A) already defined in ifdef.obj

ifdefDlg.obj : error LNK2005: "struct pcap * diz" (?diz@@3PAUpcap@@A) already defined in ifdef.obj

mehead.obj : error LNK2005: "struct pcap_if * hegre" (?hegre@@3PAUpcap_if@@A) already defined in ifdef.obj

mehead.obj : error LNK2005: "struc