[Solved] mainwindow.obj:-1: error: LNK2001: unresolved external symbol

[MohammadReza]

Hello friends.

I got into a trouble & i dont know the right solution. I searched & tried more suggestion but they dont work! :(
i cleaned,build,rebuild, delete build directory, run qmake,etc more & more.
I confused!
These are the error:

!http://upload7.ir/imgs/2014-03/91601961016608413478.jpg(http://upload7.ir/imgs/2014-03/91601961016608413478.jpg)!

please help me.
Thanks a lot.
Ya Ali.

[hpollak]

It seams like the linker couldn't find the pcap library.

Have you set the LIB in your qmake correct?

Something like:

INCLUDEPATH += c:/pcap/include
LIBS += -L c:/pcap/Lib -lwpcap ....

[MohammadReza]

Thanks for your response dear hpollak.
I installed both mcvs-opengl 32bit & 64bit.
i can solve these errors for 32bit (By declartion non-static variable !!! )
how can i solve these similar errors for x64.
Also, I've added INCLUDEPATH & LIBS but the errors are shown.

[MohammadReza]

finally i could solve one of my problem!
if you use winpcap in your program, you must add -lwsock32 in LIBS to your .pro file. like this:

@
LIBS += -LC:/WpdPack/Lib -lwpcap -lpacket -lwsock32
@

source: http://www.qtcentre.org/threads/48269-Using-Wsock32-lib-with-QT