some wrong with the code about evpp HOT 46 CLOSED

Please paste the exact error discriptions.

from evpp.

Linking CXX executable ../bin/evmc_test
../lib/libevpp_concurrentqueue.so.0.3.2.1: undefined reference to evpp::DNSResolver::OnResolved()' ../lib/libevpp_concurrentqueue.so.0.3.2.1: undefined reference to evpp::DNSResolver::ClearTimer()'

from evpp.

centos 7
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-123.el7.x86_64", arch: "amd64", family: "unix"

from evpp.

lib directory
libevmc.so libevpp_boost.so libevpp_concurrentqueue.so libevpp.so
libevmc.so.0.3 libevpp_boost.so.0.3 libevpp_concurrentqueue.so.0.3 libevpp.so.0.3
libevmc.so.0.3.2.1 libevpp_boost.so.0.3.2.1 libevpp_concurrentqueue.so.0.3.2.1 libevpp.so.0.3.2.1
libevmc_static.a libevpp_boost_static.a libevpp_concurrentqueue_static.a libevpp_static.a

from evpp.

Do you use the compile script tools/debug-build.sh or tools/release-build.sh to build?
I cannot reproduce the problem.

My env is:

[weizili@dtrans3 ~/git/evpp/tools]$ cat /etc/redhat-release 
CentOS Linux release 7.2.1511 (Core) 
[weizili@dtrans3 ~/git/evpp/tools]$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC) 

from evpp.

I try to use tools/debug-build.sh，and it just set path

[ 60%] Building CXX object test/CMakeFiles/evpp_unittest.dir/__/3rdparty/gtest/src/gtest_main.cc.o
Linking CXX executable ../bin/evpp_unittest
../lib/libevpp.so.0.3.2.1: undefined reference to evpp::DNSResolver::OnResolved()' ../lib/libevpp.so.0.3.2.1: undefined reference to evpp::DNSResolver::ClearTimer()'

from evpp.

Try to add link_directories(${LIBRARY_OUTPUT_PATH}) into CMakeLists.txt of the root directory.

@@ -49,6 +49,8 @@ endif (CMAKE_BENCHMARK_TESTING)
 set (EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)
 set (LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib)
 
+link_directories(${LIBRARY_OUTPUT_PATH})
+
 #set (MACOSX_RPATH ${LIBRARY_OUTPUT_PATH})
 set (CMAKE_MACOSX_RPATH 0)

from evpp.

if i alreay get libevmc_static.a libevpp_boost_static.a libevpp_concurrentqueue_static.a libevpp_static.a
and
g++ testserver.cpp -o server -levpp --std=c++11 to compile your demo code

from evpp.

use -L /the/path/to/library for gcc

from evpp.

[root@localhost evpp-master]# g++ testserver.cpp -o server -L /home/project/evpp-master/lib -levpp -lglog --std=c++11
/home/project/evpp-master/lib/libevpp.so: undefined reference to evpp::DNSResolver::OnResolved()' /home/project/evpp-master/lib/libevpp.so: undefined reference to evpp::DNSResolver::ClearTimer()'

from evpp.

Got it. Do you use libevent1.4?

Please pull the latest codes and try again.

from evpp.

2.0

from evpp.

OK.

1. Please pull the latest codes and try again.
2. Tell me the exact version of your libevent. My libevent version is 2.0.21

from evpp.

ok， i find “#if LIBEVENT_VERSION_NUMBER >= 0x02010500 ” in libevent_headers.h
so i confirm libevent version in my computer,libevent-2.0.so.5.0.1
the issue maybe the libevent version,and hope u fix the problem

from evpp.

Try this command rpm -qa|grep libevent and paste the output.

from evpp.

ls -al /usr/local/lib | grep libevent
lrwxrwxrwx. 1 root root 21 Mar 24 09:59 libevent-2.0.so.5 -> libevent-2.0.so.5.0.1
-rwxr-xr-x. 1 root root 1106029 Mar 24 09:59 libevent-2.0.so.5.0.1
-rw-r--r--. 1 root root 603088 Apr 26 09:50 libevent.a

from evpp.

rpm -qa|grep libevent
i dont install libevent with yum ,just cmake and make && make install

from evpp.

Please try to use yum to install libevent sudo yum install libevent-devel. Or use a higher version of libevent >= 2.0.15.

I don't have ENV to test if you can't show me the exact version of your libevent.

from evpp.

i reinstall libevet using 3rdparty/libevent-release-2.1.8-stable
cmake . and make

from evpp.

Does it work now?

from evpp.

std::cout.setf(std::ios_base::hex,std::ios_base::basefield);
std::cout << LIBEVENT_VERSION_NUMBER << std::endl;

2010800

still [ 53%] Built target evpp_static
Linking CXX executable ../bin/evpp_unittest
../lib/libevpp.so.0.3.2.1: undefined reference to evpp::DNSResolver::OnResolved()' ../lib/libevpp.so.0.3.2.1: undefined reference to evpp::DNSResolver::ClearTimer()'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/evpp_unittest] Error 1
make[1]: *** [test/CMakeFiles/evpp_unittest.dir/all] Error 2

from evpp.

Do you pull the latest code?

$ git log
commit 02a40d0059c46861e01e8aa0fc6df003b1277f2e
Author: weizili <[email protected]>
Date:   Tue Apr 25 19:42:24 2017 +0800

    Fix issue https://github.com/Qihoo360/evpp/issues/39

from evpp.

Linking CXX executable ../bin/evmc_test
../lib/libevpp_concurrentqueue.so.0.3.2.2536: undefined reference to evhttp_connection_get_addr' ../lib/libevpp_concurrentqueue.so.0.3.2.2536: undefined reference to evhttp_connection_set_timeout_tv'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/evmc_test] Error 1
make[1]: *** [apps/CMakeFiles/evmc_test.dir/all] Error 2

commit 02a40d0
Author: weizili [email protected]
Date: Tue Apr 25 19:42:24 2017 +0800

from evpp.

Which version of libevent do you link aganst?
Please paste the output of ldd libevpp_concurrentqueue.so.0.3.2.2536.
We strongly suggest you to use sudo yum install libevent-devel to install libevent.

from evpp.

linux-vdso.so.1 =>  (0x00007fffa6ffe000)
libevent-2.0.so.5 => /usr/local/lib/libevent-2.0.so.5 (0x00007f160d276000)
libglog.so.0 => /usr/local/lib/libglog.so.0 (0x00007f160d046000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f160ce2a000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f160cb22000)
libm.so.6 => /lib64/libm.so.6 (0x00007f160c820000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f160c609000)
libc.so.6 => /lib64/libc.so.6 (0x00007f160c247000)
/lib64/ld-linux-x86-64.so.2 (0x00007f160d72d000)

from evpp.

std::cout.setf(std::ios_base::hex,std::ios_base::basefield);
std::cout << LIBEVENT_VERSION_NUMBER << std::endl;

2010800

from evpp.

I commented code in CMakeLists.txt
#add_subdirectory (apps)
#add_subdirectory (test)
#add_subdirectory (examples)
#add_subdirectory (benchmark)

get result
[ 16%] Built target evpp
[ 33%] Built target evpp_boost
[ 50%] Built target evpp_boost_static
[ 66%] Built target evpp_concurrentqueue
[ 83%] Built target evpp_concurrentqueue_static
[100%] Built target evpp_static

so i just test echodemo on website
g++ echo.cpp -o echo --std=c++11 -levpp -lglog
/usr/local/lib/libevpp.so: undefined reference to evhttp_connection_get_addr' /usr/local/lib/libevpp.so: undefined reference to evhttp_connection_set_timeout_tv'

why http？

from evpp.

evpp is library for TCP/UDP/HTTP protocols.

I guess that you use header files from libevent-2.1.8 when compiling, but link against a libevent.so from libevent-2.0.x.

Please paste the output of ldd /usr/local/lib/libevpp.so

from evpp.

linux-vdso.so.1 =>  (0x00007ffffc7fe000)
libevent-2.0.so.5 => /usr/local/lib/libevent-2.0.so.5 (0x00007f0389523000)
libglog.so.0 => /usr/local/lib/libglog.so.0 (0x00007f03892f3000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f03890d7000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f0388dcf000)
libm.so.6 => /lib64/libm.so.6 (0x00007f0388acd000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f03888b6000)
libc.so.6 => /lib64/libc.so.6 (0x00007f03884f4000)
/lib64/ld-linux-x86-64.so.2 (0x00007f03899d6000)
libunwind.so.8 => /usr/local/lib/libunwind.so.8 (0x00007f03882db000)

from evpp.

/usr/local/lib/libevent-2.0.so.5 is compiled from libevent-2.1.8???

from evpp.

std::cout.setf(std::ios_base::hex,std::ios_base::basefield);
std::cout << LIBEVENT_VERSION_NUMBER << std::endl;

2010800

from evpp.

Paste the output of nm /usr/local/lib/libevent-2.0.so.5 | grep evhttp_connection_set_timeout

from evpp.

Paste the output of strings /usr/local/lib/libevent-2.0.so.5 | grep 2.

from evpp.

strings libevent-2.0.so.5 | grep evhttp_connection_set_timeout
evhttp_connection_set_timeout
evhttp_connection_set_timeout
evhttp_connection_set_timeout

2.0.10-stable？

from evpp.

Yes, that's the problem.
You said you have reinstalled libevet using 3rdparty/libevent-release-2.1.8-stable. But you linked against with libevent-2.0.10.
Your ENV massed up totally.

from evpp.

strings libevent.a | grep 2.
2.1.8-beta not stable

from evpp.

But you link against libevent.so not libevent.a

from evpp.

Please clean up your ENV, and use sudo yum install libevent-devel to reinstall libevent

from evpp.

ok

from evpp.

why TCPClient has no send function

from evpp.

You will get a ConnectionCallback when TCPClient established a connection with the remote server, in which you can hold the TCPConn, and you can use TCPConn to send message.

from evpp.

#include <evpp/tcp_client.h>
#include <evpp/buffer.h>
#include <evpp/tcp_conn.h>
#include

int main() {
std::string addr = "127.0.0.1:9099";
evpp::EventLoop loop;
evpp::TCPClient client(&loop,addr,"demo");
client.SetConnectionCallback([](const evpp::TCPConnPtr& ptr) {
std::cout << "connect to server." << std::endl;
ptr->Send("hello,server.");
});
client.SetMessageCallback([](const evpp::TCPConnPtr& ptr,evpp::Buffer* buf) {
std::cout << buf->ToString() << std::endl;});
client.Connect();
}

from evpp.

All the operations are nonblocking, so you need to call loop.Run().
Please see : https://github.com/Qihoo360/evpp/blob/master/examples/tcp/tcp_client.cc

from evpp.

Thanks, I appreciate for ur patience

from evpp.

You are welcome.

from evpp.

请清理你的ENV，并使用sudo yum install libevent-devel重新安装libevent

clean up your ENV

how clean up my ENV

from evpp.