Debug Loadlibrary Error

ZhangNovember 20, 20061 0 0 0 LoadLibrary is one of the mostly used yet unbelieveably complex APIs in Windows, if not the one. Russ Osterlundhas a full MSDN loadlibrary error 193 article discussing LoadLibrary, yet he only touches the surface of the

Loadlibrary Error Code 126

problem (how it works under normal condition.) Mike Grier is one of the most talented developers I loadlibrary error 126 minecraft have worked with in Microsoft. He devoted a full series on the intricacyof LoadLibrary. Yet he has to put it to a halt due to the complexity of loadlibrary error 14001 the problem. For developers that outside of the loader team, they don't have to understand all the intricacy of LoadLibrary (though they do need to understand how it works, the dos and don'ts of LoadLibrary, etc.). But then LoadLibrary fails, they do need to figure out why it fails. There are times that this is just

Loadlibrary Error 1114

hard to figure out why, especially when the binary depends on other dlls that they don't have source code available. Fortunately, the loader team recognized the problem, and provided a built-in trace log to debug obsure LoadLibrary failures. The trace log is called "loader snaps" internally. You can turn on loader snaps using gflags.exe. gflags.exe is part of Debugging Tools for Windows. You can download it from http://www.microsoft.com/whdc/devtools/debugging/default.mspx. To enable loader snaps, run "gflags.exe -i your-app-without-path.exe +sls" You have to run your application under debugger to see the loader snaps. You can use debuggers in the Debugging Tools for Windows package. An example is shown at the bottom of this article. If there is any failures, you will see "failed" in loader snaps. Be warned that loader snaps may have enormous output. You may want to isolate the problem before turning on loader snaps. gflags.exe can also turn on all kinds of debugging capabilities, please refer to MSDN http://technet2.microsoft.com/WindowsServer/en/library/00d4872f-eeb3-4a6e-910a-299ad55aed631033.mspx?mfr=truefor more information. An example of loader snaps: D:\Tools>c:\de

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System Loadlibrary Error

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find another, you should check the library's dependencies and make sure that the directory in which the missing library resides is part of the load http://mindspill.net/computing/linux-notes/debugging-load-library-path-issues/ library path. One example of this problem, that I experienced recently, occurred when the Magick.so library was unable to open the libMagick.so.10 library. The error message was as follows: Can't load '/usr/lib/perl5/site_perl/5.8.7/i686-linux/auto/Image/Magick/Magick.so' for module Image::Magick: libMagick.so.10: cannot open shared object file: No such file or directory at /usr/lib/perl5/5.8.7/i686-linux/DynaLoader.pm line 230. at (eval 113) line 1 Compilation failed in require at loadlibrary error (eval 113) line 1. BEGIN failed--compilation aborted at (eval 113) line 1. Find out library dependencies with ldd The ldd command will check the dependencies of a library. ldd /the/library/path/libWhatever.so Using the above example problem: username@localhost [~]# ldd /usr/lib/perl5/site_perl/5.8.7/i686-linux/auto/Image/Magick/Magick.so libMagick.so.10 => not found libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x0099a000) libz.so.1 => /usr/lib/libz.so.1 (0x00111000) libtiff.so.3 => /usr/lib/libtiff.so.3 (0x00121000) libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x00d54000) libXext.so.6 => loadlibrary error 126 /usr/X11R6/lib/libXext.so.6 (0x001f4000) libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x0016e000) libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x00910000) libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x0039d000) libXt.so.6 => /usr/X11R6/lib/libXt.so.6 (0x005bc000) libpthread.so.0 => /lib/tls/libpthread.so.0 (0x004cc000) libm.so.6 => /lib/tls/libm.so.6 (0x00216000) libc.so.6 => /lib/tls/libc.so.6 (0x00bda000) libdl.so.2 => /lib/libdl.so.2 (0x00177000) /lib/ld-linux.so.2 (0x002c2000) You can see in that the libMagick.so.10 library was not found. Locate the library with find or locate or slocate or by any other means Find the location of the library that couldn't be found by ldd. The chances are that the library will be in a subdirectory of /usr. Continuing with the above example... username@localhost [~]# find /usr -name "libMagick.so.10" /usr/local/lib/libMagick.so.10 Add the library to the load library path with ldconfig In the words of the man page, ldconfig will configure dynamic linker run time bindings. Add your missing library to the bindings with the following command: ldconfig /path/to/add For our libMagick example, this would be: username@localhost [~]# ldconfig /usr/local/lib You can see a list of librarys that are being used with the -p flag. username@localhost [~]# ldconfig -p 907 libs found in cache `/etc/ld.so.cache' libzvt.so.2 (libc6) => /usr/lib/libzvt.so.2 libzvt.so (libc6) => /usr/l