# Undefined symbol: wav\_write\_sample **URL:** \ **Category:** GNU Radio\ **Created:** [August 17, 2014, 4:24pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588 "2014-08-17T16:24:16Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [August 17, 2014, 4:24pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/1 "2014-08-17T16:24:16Z")
Hello, I am developing a block. Now it is a copy of Wav File Sink block. It compiles fine but in the GRC gives me the error: ImportError: /usr/local/lib/libgnuradio-MLABlocks.so: undefined symbol: \_ZN2gr6blocks16wav\_write\_sampleEP8\_IO\_FILEsi This is the block: [https://github.com/qarlosalberto/wav-sink](https://github.com/qarlosalberto/wav-sink) \*I have done: sudo ldconfig \*\* I have serched in the mailing list, but I haven’t solved the problem. Thank you. ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 17, 2014, 4:55pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/2 "2014-08-17T16:55:14Z")
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Carlos, you seem to be setting up linking correctly (if you’re not even requiring more GNU Radio modules than actually necessary in your main CMakeLists.txt); however try doing ldd /usr/local/lib/libgnuradio-MLABlocks.so and check whether the library really is linked against libgnuradio-blocks. Greetings, Marcus On 17.08.2014 16:23, Carlos Alberto Ruiz Naranjo wrote: > \*I have done: sudo ldconfig \*\* I have serched in the mailing list, > but I haven’t solved the problem. > > Thank you. > > \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Discuss-gnuradio > mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJT8MIYAAoJEAFxB7BbsDrLZxkIAIZH8g/2c25J0Z21gfhsrDTJ JP03eU4udk0PieBoYE3c3ghUwHN4zoOHyAoIG7cll6wiAmwUzJfyd+4kguG0cblK Rhfp+iW4MM8+xCXwp6mwng6T2iAlniPJvhOy7AJvIImIHqqdA2B/tCCg9P+qrkCP GaBiqnW31TCatMfrOwxtpT+/2kgKPQKT2BvvmPvcsC72FpTVe3a3VPeL+lZgSG6j h2u4WRF82VeuL9hSl993BikNt9DkvQSFhrITorhhoCB9jl9vgDGBw9qKK5JMaWN1 oGMwNT6+9lyWtdVQXp/kqgAP5c2+W9bgEkFRdjn/dVOWcOkFF5aJuwCZeaYabXg= =lIHc -----END PGP SIGNATURE----- ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 17, 2014, 5:08pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/3 "2014-08-17T17:08:22Z")
Hello Marcus, It is the out: carlos@carlos-PC:~/Escritorio/gr-MLABlocks/build$ ldd /usr/local/lib/libgnuradio-MLABlocks.so linux-vdso.so.1 =\> (0x00007fff3b5fe000) libboost\_system.so.1.53.0 =\> /usr/lib/x86\_64-linux-gnu/libboost\_system.so.1.53.0 (0x00007f6bdf7a2000) libgnuradio-runtime-3.7.2.1.so.0.0.0 =\> /usr/local/lib/libgnuradio-runtime-3.7.2.1.so.0.0.0 (0x00007f6bdf4f1000) libgnuradio-pmt-3.7.2.1.so.0.0.0 =\> /usr/local/lib/libgnuradio-pmt-3.7.2.1.so.0.0.0 (0x00007f6bdf2a9000) libstdc++.so.6 =\> /usr/lib/x86\_64-linux-gnu/libstdc++.so.6 (0x00007f6bdefa5000) libm.so.6 =\> /lib/x86\_64-linux-gnu/libm.so.6 (0x00007f6bdeca1000) libgcc\_s.so.1 =\> /lib/x86\_64-linux-gnu/libgcc\_s.so.1 (0x00007f6bdea8a000) libc.so.6 =\> /lib/x86\_64-linux-gnu/libc.so.6 (0x00007f6bde6c2000) libvolk.so.0.0.0 =\> /usr/local/lib/libvolk.so.0.0.0 (0x00007f6bde37c000) libboost\_filesystem.so.1.53.0 =\> /usr/lib/x86\_64-linux-gnu/libboost\_filesystem.so.1.53.0 (0x00007f6bde165000) libboost\_thread.so.1.53.0 =\> /usr/lib/x86\_64-linux-gnu/libboost\_thread.so.1.53.0 (0x00007f6bddf4f000) libpthread.so.0 =\> /lib/x86\_64-linux-gnu/libpthread.so.0 (0x00007f6bddd32000) librt.so.1 =\> /lib/x86\_64-linux-gnu/librt.so.1 (0x00007f6bddb29000) /lib64/ld-linux-x86-64.so.2 (0x00007f6bdfbf1000) liborc-0.4.so.0 =\> /usr/lib/x86\_64-linux-gnu/liborc-0.4.so.0 (0x00007f6bdd8aa000) Should be linked libgnuradio-blocks, right? 2014-08-17 16:54 GMT+02:00 Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 17, 2014, 5:46pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/4 "2014-08-17T17:46:32Z")
yes, should be linked against libgnuradio-blocks.so. So something goes wrong when setting the link libraries. In your main CMakeLists.txt, can you try to delete the BLOCK, GRU and GR entries (I don’t think that these exist as GNU Radio submodules; how did they get there?) and try again? Greetings, Marcus On 17.08.2014 17:05, Carlos Alberto Ruiz Naranjo wrote: > /usr/local/lib/libgnuradio-runtime-3.7.2.1.so.0.0.0 (0x00007f6bdf4f1000) > libgnuradio-pmt-3.7.2.1.so.0.0.0 =\> > /usr/local/lib/libgnuradio-pmt-3.7.2.1.so.0.0.0 (0x00007f6bdf2a9000) > libstdc++.so.6 =\> /usr/lib/x86\_64-linux-gnu/libstdc++.so.6 > (0x00007f6bdefa5000) > libm.so.6 =\> /lib/x86\_64-linux-gnu/libm.so.6 (0x00007f6bdeca1000) > libgcc\_s.so.1 =\> /lib/x86\_64-linux-gnu/libgcc\_s.so.1 > (0x00007f6bdea8a000) > libc.so.6 =\> /lib/x86\_64-linux-gnu/libc.so.6 (0x00007f6bde6c2000) > libvolk.so.0.0.0 =\> /usr/local/lib/libvolk.so.0.0.0 > (0x00007f6bde37c000) > libboost\_filesystem.so.1.53.0 =\> > /usr/lib/x86\_64-linux-gnu/libboost\_filesystem.so.1.53.0 > (0x00007f6bde165000) ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 18, 2014, 2:13pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/5 "2014-08-18T14:13:15Z")
Carlos, the functions in wavfile.cc are not publicly exported. We might want to change that, since wavfile.h is actually publicly visible. You can try and add the BLOCKS\_API macro in wavfile.h. That will probably fix your troubles. If so, please submit a patch & pull request. M ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 17, 2014, 8:17pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/6 "2014-08-17T20:17:51Z")
I have: - Ubuntu 13.10 - Kernel: 3.11.0-19-generic - GNURadio 3.7.2.1 2014-08-17 17:45 GMT+02:00 Marcus Müller [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 19, 2014, 8:18pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/7 "2014-08-19T20:18:56Z")
It runs. I have done a pull request. Thank you all 😉 2014-08-18 14:12 GMT+02:00 Martin B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 21, 2014, 10:45am UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/8 "2014-08-21T10:45:24Z")
Hello, I am creating a new block (modified wavfile\_sink). Now it is only a copy-paste of wavfile\_sink. I have this error in GRC: Traceback (most recent call last): File “/home/carlos/Escritorio/ESA/apt\_rec\_v01.py”, line 111, in tb = apt\_rec\_v01() File “/home/carlos/Escritorio/ESA/apt\_rec\_v01.py”, line 68, in **init** self.noaa\_dec\_0 = sat\_observer.wavfile\_sink(“/tmp/bien.wav”, 1, 11025, 16) AttributeError: ‘module’ object has no attribute ‘wavfile\_sink’ This is the code: [https://github.com/qarlosalberto/MLABlock](https://github.com/qarlosalberto/MLABlock) \*\* With sudo ldconfig doesnt run. Thank you. 2014-08-19 20:16 GMT+02:00 Carlos Alberto Ruiz Naranjo \< removed\_email\_address@domain.invalid\>: ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 21, 2014, 12:05pm UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/9 "2014-08-21T12:05:52Z")
I have cleaned the build directory, later: cmake … make sudo make install I have the same error :S 2014-08-21 11:35 GMT+02:00 Martin B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [August 21, 2014, 11:36am UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/10 "2014-08-21T11:36:34Z")
On 08/21/2014 10:44 AM, Carlos Alberto Ruiz Naranjo wrote: > ``` > self.noaa_dec_0 = sat_observer.wavfile_sink("/tmp/bien.wav", 1, > > ``` > > 11025, 16) > AttributeError: ‘module’ object has no attribute ‘wavfile\_sink’ Could be a SWIG issue – try clearing the build dir and starting again. M ---
**Author:** ![Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/34f0e0/32.png) [@Carlos\_Alberto\_Ruiz](https://www.ruby-forum.com/u/Carlos_Alberto_Ruiz)\ **Post date:** [September 5, 2014, 1:47am UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588/11 "2014-09-05T01:47:16Z")
Hello, I have exported the functions in the include file: ``` BLOCKS_API bool wavheader_complete(FILE *fp, unsigned int ``` byte\_count); But when I use gr::blocks::wavheader\_complete(d\_fp, byte\_count); In GRC I have the error: AttributeError: ‘module’ object has no attribute ‘noaa\_analog\_decoder\_f’ Do you know what is the problem? :S 2014-08-21 12:04 GMT+02:00 Carlos Alberto Ruiz Naranjo \< removed\_email\_address@domain.invalid\>: