man 1 nm

https://web.archive.org/web/20160316222941/https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/nm.1.html

For example:

    nm -gU /usr/local/Cellar/cairo/1.12.16/lib/cairo/libcairo-trace.0.dylib

Use [otool][1]:

    otool -TV your.dylib

OR

    nm -g your.dylib

  [1]: http://www.manpagez.com/man/1/otool/

Use `nm -a your.dylib`

It will print all the symbols including globals

Use Mach-OView for viewing all the Symbols in dylib

https://sourceforge.net/projects/machoview/

I get a error message while updating my service reference:

_Custom tool warning: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information._

How can I retrieve the LoaderException property?

**Update:** My errors went away when I reimported the domain object projects. I have no idea why this fixed the issue, but I&#39;m happy it&#39;s working.

How to retrieve the LoaderException property?

In Java I am told that when doing a null check one should use == instead of .equals(). What are the reasons for this?

Java null check why use == instead of .equals()

So I&#39;ve been trying to get dynamic libraries to work in my XCode project under Mac OS X. So far no joy.

I am able to load the dylib file, but when I call dlsym to get the function pointer, it returns 0 and dlerror says symbol not found.

So I am wondering if there is a simple way to list the symbols that are exported from a dylib file. Any ideas would be great.

How to print a list of symbols exported from a dynamic library

So I've been trying to get dynamic libraries to work in my XCode project under Mac OS X. So far no joy.
I am able to load the dylib file, but when I call dlsym to get the function pointer, it returns 0 and dlerror says symbol not found.
So I am wondering if there is a simple way to list the symbols that are exported from a dylib file. Any ideas would be great.

I&#39;m new to Objective C. I have basic knowledge in C, including the concept of pointers. I have two basic questions:

 1. Can someone explain the difference between assign,copy, and retain with some analogy?
 2. How do you handle a function which returns pointer variable, and how do you perform messaging through a return pointer?

Objective C - Assign, Copy, Retain

##The setup...
Trying to set up a clean Mac os X 10.6 install to develop python/django and I didn&#39;t remember running into this on 10.5.

After installing MySQL from the installer on `mysql-5.5.8-osx10.6-x86_64.dmg` I ran

    $ sudo pip install MySQL-python

and it seemed to go smoothly (output below)

    Downloading/unpacking MySQL-python
      Downloading MySQL-python-1.2.3.tar.gz (70Kb): 70Kb downloaded
      Running setup.py egg_info for package MySQL-python
        warning: no files found matching &#39;MANIFEST&#39;
        warning: no files found matching &#39;ChangeLog&#39;
        warning: no files found matching &#39;GPL&#39;
    Installing collected packages: MySQL-python
      Running setup.py install for MySQL-python
        building &#39;_mysql&#39; extension
        gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -pipe -Dversion_info=(1,2,3,&#39;final&#39;,0) -D__version__=1.2.3 -I/usr/local/mysql/include -I/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c _mysql.c -o build/temp.macosx-10.6-universal-2.6/_mysql.o -Os -g -fno-common -fno-strict-aliasing -arch x86_64
        In file included from _mysql.c:36:
        /usr/local/mysql/include/my_config.h:325:1: warning: &quot;SIZEOF_SIZE_T&quot; redefined
        In file included from /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:9,
                         from pymemcompat.h:10,
                         from _mysql.c:29:
        /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/pymacconfig.h:33:1: warning: this is the location of the previous definition
        In file included from _mysql.c:36:
        /usr/local/mysql/include/my_config.h:419:1: warning: &quot;HAVE_WCSCOLL&quot; redefined
        In file included from /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:8,
                         from pymemcompat.h:10,
                         from _mysql.c:29:
        /System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/pyconfig.h:803:1: warning: this is the location of the previous definition
        gcc-4.2 -Wl,-F. -bundle -undefined dynamic_lookup build/temp.macosx-10.6-universal-2.6/_mysql.o -L/usr/local/mysql/lib -lmysqlclient_r -lpthread -o build/lib.macosx-10.6-universal-2.6/_mysql.so -arch x86_64
        warning: no files found matching &#39;MANIFEST&#39;
        warning: no files found matching &#39;ChangeLog&#39;
        warning: no files found matching &#39;GPL&#39;
    Successfully installed MySQL-python
    Cleaning up...

after this I tried:

    $ python -c &quot;import MySQLdb&quot;

and it crapped out on me with:

    Traceback (most recent call last):
      File &quot;&lt;string&gt;&quot;, line 1, in &lt;module&gt;
      File &quot;/Library/Python/2.6/site-packages/MySQLdb/__init__.py&quot;, line 19, in &lt;module&gt;
        import _mysql
    ImportError: dlopen(/Library/Python/2.6/site-packages/_mysql.so, 2): Library not loaded: libmysqlclient.16.dylib
      Referenced from: /Library/Python/2.6/site-packages/_mysql.so
      Reason: image not found

##So on to my question...

What did I do wrong?/What else do I need to do?

Googling (and searching here) for this returns a lot of results getting this error message with Ruby not too many with Python tho.


Python: MySQLdb and &quot;Library not loaded: libmysqlclient.16.dylib&quot;

How can I do an HTTP GET from a Un*x shell script on a stock OS X system? (installing third-party software is not an option, for this has to run on a lot of different systems which I don&#39;t have control on).

For example if I start the Mercurial server locally doing a *hg serve*:

    ... $ hg serve 

And then, from a Linux that has the *wget* command I do a wget:


    ... $  wget http://127.0.0.1:8000
    --2010-12-31 22:18:25--  http://127.0.0.1:8000/
    Connecting to 127.0.0.1:8000... connected.
    HTTP request sent, awaiting response... 200 Script output follows
    Length: unspecified [text/html]
    Saving to: `index.html

And on the terminal in which I launched the *&quot;hg serve&quot;* command, I can indeed see that an HTTP GET made its way:

    127.0.0.1 - - [30/Dec/2010 22:18:17] &quot;GET / HTTP/1.0&quot; 200 -

So on Linux one way to do an HTTP GET from a shell script is to use *wget* (if that command is installed of course).

What other ways are there to do the equivalent of a *wget*?  I&#39;m looking, in particular, for something that would work on stock OS X installs.



OS X: equivalent of Linux&#39;s wget

I install XAMPP server on MAC OS 10.6 it was working fine.
After a lot of days I checked it, but not working this time, localhost not opening this time.

after some R&amp;D I reinstall XAMPP server after uninstall

When I start the apache after reinstall it giving port 80 running a another webserver Then I restart system, then apache start ok, but same local host not working

Then I check Web Sharing in my System Preference then it was already Tuned Off ...

Please anybody tell me where I am wrong?

XAMPP Apache Webserver localhost not working on MAC OS

In my iPhone app, I have many ASCII arts which I need to insert into the database.

I am using the simulator and pasting the textpic in the textview to insert the ASCII art to database.

Here the clipboard of simulator once pastes the art properly but when I copy another art then too it pastes the previous art into textview. 

How to solve this problem? Is there a work around for this or any better approach?


Copy from Mac OS X does not copy to iPhone Simulator

Are dynamic libraries supported on iOS (iPhone/iPad)?  

In Xcode, I tried to create a **New project** -&gt; **Framework &amp; Library** -&gt; **Cocoa Library (dynamic)**. In the project settings, I set the **Base SDK** to `iOS device 4.1` and target to `iOS4.1`, but it has a build error:

&gt; target specifies product type &#39;com.apple.product-type.library.dynamic&#39;, but there&#39;s no such product type for the &#39;iphonesimulator&#39; platform&quot;. 

The build i selected is **Simulator -&gt; Debug -&gt; i386**.


Can you build dynamic libraries for iOS and load them at runtime?

When trying to run an executable I&#39;ve been sent in Mac OS X, I get the following error

    dyld: Library not loaded: libboost_atomic.dylib
      Referenced from: /Users/&quot;Directory my executable is in&quot;
      Reason: image not found
    Trace/BPT trap:5

I have installed the boost libraries and they are located in `/opt/local/lib`. I think the problem has something to do with the executable only looking in the directory it is in as when I paste the &#39;libboost_atomic.dylib&#39; in there, it doesn&#39;t mind about it anymore. Unfortunately then it complains it can&#39;t find the next boost library.

Is there an easy way to fix this?

dyld: Library not loaded ... Reason: Image not found

When using an embedded framework (dyld) in Xcode 6.0.1 with deployment target less that iOS 8 I get:

 - Build is successful
 - Runtime library loading error

Error:

    dyld: Library not loaded: @rpath/ObjectiveLyricsTouch2.framework/ObjectiveLyricsTouch2        
    Referenced from: /private/var/mobile/Containers/Bundle/Application/DC65ACA9-98E5-46CD-95F8-829D3416F6C0/musiXmatch.app/musiXmatch
    Reason: image not found
    (lldb) 


Xcode 6 and Embedded Frameworks only supported in iOS8

Xcode 7
In Target &gt; BuildPhases &gt; Link Binary With Libraries &gt; tap + button

When choosing frameworks to add, you cannot find *.dylib, you&#39;ll see *.tbd instead. 

What is the reason for this? 


**For people who need dylib, follow from this [post][1]

1. Choose &quot;Add other&quot;
2. Once in the file selection window do &quot;CMD&quot;+Shift+G (Go to folder) &amp; type /usr/lib/
3. From /user/lib you can find the *.dylib files


  [1]: https://stackoverflow.com/questions/30815806/swift-2-ios-9-libz-dylib-not-found

Why Xcode 7 shows *.tbd instead of *.dylib?

I have a dynamic libray libtest.dylib that is installed in `/PATH/lib`, and an execution binary, myapp, that uses the dylib installed in `/PATH/bin`. 

I can run `myapp` to find the dylib as follows (https://stackoverflow.com/questions/3146274/is-it-ok-to-use-dyld-library-path-on-mac-os-x-and-whats-the-dynamic-library-s):

    DYLD_LIBRARY_PATH=&quot;/PATH/lib&quot; myapp 

I think I can use `install_name_tool` to update the library and executable so that the library can be found with rpath. I used the hints in this post - https://stackoverflow.com/questions/17202313/how-can-i-specify-the-rpath-in-a-dylib. 

In lib, I executed this command to add rpath.

    install_name_tool -id &quot;@rpath/libtest.dylib&quot; libtest.dylib
    install_name_tool -add_rpath &quot;@executable_path/../lib/&quot; libtest.dylib

In bin, I executed `install_name_tool -add_rpath &quot;@executable_path/../lib/&quot; myapp`.

However, when I executed `myapp` in `bin` directory, I have the error messages.

    dyld: Library not loaded: libtest.dylib
      Referenced from: /PATH/bin/./myapp
      Reason: image not found
    Trace/BPT trap: 5

`otool -l myapp` shows the rpath is correctly updated in myapp.

    Load command 16
              cmd LC_RPATH
          cmdsize 40
             path @executable_path/../lib/ (offset 12)

The same is true with libtest.dylib

    Load command 13
              cmd LC_RPATH
          cmdsize 40
             path @executable_path/../lib/ (offset 12)

What might be wrong? 

## ADDED

Of course, I can use ` cc -install_name` when compile and link time, but I wanted to know how to do the same thing my modifying the generatd dylib and execution binary. 

From the lib:

    cc -install_name &quot;@loader_path/../lib/libtest.dylib&quot; -dynamiclib -o libtest.dylib test.c

Or, the install_name can use @rpath:

    cc -install_name &quot;@rpath/libtest.dylib&quot; -dynamiclib -o libtest.dylib test.c

From the bin:

    cc -I../lib -c main.c
    cc -o main main.o ../lib/libtest.dylib -Wl,-rpath -Wl,@loader_path/../lib

Or just one line:

    cc -I../lib -L../lib -o main main.c -ltest -Wl,-rpath -Wl,@loader_path/../lib

Content Type	Original Author	Original Content on Stackoverflow
Question	Gerald	View Question on Stackoverflow
Solution 1 - Macos	MK.	View Answer on Stackoverflow
Solution 2 - Macos	linuxbuild	View Answer on Stackoverflow
Solution 3 - Macos	Omkar Ramtekkar	View Answer on Stackoverflow
Solution 4 - Macos	Sahil Doshi	View Answer on Stackoverflow

How to print a list of symbols exported from a dynamic library

Macos Problem Overview

Macos Solutions

Solution 1 - Macos

Solution 2 - Macos

Solution 3 - Macos

Solution 4 - Macos

Java null check why use == instead of .equals()

How to retrieve the LoaderException property?

Attributions