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Re: [Wireshark-dev] 回复: how to use the wire shark source code to developapplication ?
From: Pascal Quantin <pascal.quantin () gmail com>
Date: Sun, 30 Mar 2014 13:55:57 +0200

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2014-03-30 11:54 GMT+02:00 我想不无聊 <237825552 () qq com>:

If i define the  variable in the wireshark directory and i use it in the
/wiretap and  /epan/dissectors whether or not should i use the  WS_DLL_PUBLIC
macro,and by the way i use the wireshark 1.6.5 edition,then what should i
do.


If you use Wireshark 1.6.5 source code, you must declare your structure as
WS_VAR_IMPORT instead of extern, and add it to wtap.def file. Something
like:
WS_VAR_IMPORT performance* performance_test;

and in wtap.def:
performance_test DATA

You can look at other examples of the use of WS_VAR_IMPORT in the source
code.

Regards,
Pascal.

PS: there is no need to send multiple emails to the mailing list with the
same question over and over.


------------------ 原始邮件 ------------------
*发件人:* "Pascal Quantin";<pascal.quantin () gmail com>;
*发送时间:* 2014年3月30日(星期天) 下午5:06
*收件人:* "Developer support list for Wireshark"<wireshark-dev () wireshark org>;

*主题:* Re: [Wireshark-dev] how to use the wireshark source code to
developapplication?


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:

//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;
}performance;
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!

Hi,

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.

Regards,
Pascal.

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