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Re: how to use the wireshark source code to develop application?
From: Pascal Quantin <pascal.quantin () gmail com>
Date: Sun, 30 Mar 2014 11:06:04 +0200

Le 30 mars 2014 08:58, "我想不无聊" <237825552 () qq com> a écrit :

I want to store some information about packets and transmit among
files,so i create a file in wireshark root directory,named performance.h:

#include <glib.h>
typedef struct performance_s
gfloat time[100];
       gfloat delay[100];
guint32 packetSize[100];
guint32 payload;
guint32 index;
guint32 temp_size;
gfloat temp_time;
extern peformance* performance_test;

in the file ,i declare a struct and declare a pointer to it,then i want
to use the variable "performance_test" in file
wiretap/libpcap.c, epan/dissectors/packet-ieee80211.c,so i define
the variable "peformance_test" in performance.c in wireshark root directory
 and include the head file
in wiretap/libpcap.c, epan/dissectors/packet-ieee80211.c ,but once i use
the variable in these two files,when i compile the wireshark project,it
come up with one error:undefined reference to 'peformance_test'.

it looks like the variable peformance_test should be defined and used in
the same file ,if i want to use it in different files,i think i should
modify the makefile.common to change the compile process ,but i don't know
how .could someone help me fix it,please!


Assuming you work on the master branch (Wireshark 1.11.X), if you want to
use in libwireshark a variable defined in libwiretap, you should export the
symbol with the WS_DLL_PUBLIC macro instead of using extern. Do not forget
to include ws_symbol_export.h file also.
You can search in the code for examples of the use of this macro.

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