DllNotFoundException utilisant Mono P/Invoke: Pourquoi?

Question

Je continue d'obtenir DllNotFoundExceptions lorsque j'essaie d'appeler ma bibliothèque native à partir de C# (en utilisant Mono). J'ai une bibliothèque native, pour laquelle j'ajoute des bindings.

C'est ce que je vois:

$ grep DllImport generated/NativeLibrawLoader.cs | head -n 1 
[DllImport("libfspotraw.dll")] 



$ cat libfspotraw-sharp.dll.config 
<configuration> 
    <dllmap dll="libglib-2.0-0.dll" target="libglib-2.0.so.0"/> 
    <dllmap dll="libgobject-2.0-0.dll" target="libgobject-2.0.so.0"/> 
    <dllmap dll="libgthread-2.0-0.dll" target="libgthread-2.0.so.0"/> 
    <dllmap dll="libatk-1.0-0.dll" target="libatk-1.0.so.0"/> 
    <dllmap dll="libgtk-win32-2.0-0.dll" target="libgtk-x11-2.0.so.0"/> 
    <dllmap dll="libgdk-win32-2.0-0.dll" target="libgdk-x11-2.0.so.0"/> 
    <dllmap dll="libgdk_pixbuf-2.0-0.dll" target="libgdk_pixbuf-2.0.so.0"/> 
    <dllmap dll="libfspotraw.dll" target="/opt/gnome//lib/f-spot/libfspotraw.so.0"/> 
</configuration> 

Et un extrait du journal de strace:

5856 1247991911.215674 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.215814 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.215923 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.215992 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.216083 open("/opt/gnome//lib/f-spot/libfspotraw.so.0", O_RDONLY) = 25 
5856 1247991911.216154 read(25, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000\277\0\0004\0\0\0\\"..., 512) = 512 
5856 1247991911.216226 fstat64(25, {st_mode=S_IFREG|0755, st_size=923041, ...}) = 0 
5856 1247991911.216320 mmap2(NULL, 806536, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 25, 0) = 0x2a26000 
5856 1247991911.216431 mmap2(0x2a99000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 25, 0x72) = 0x2a99000 
5856 1247991911.216506 mmap2(0x2a9f000, 310920, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2a9f000 
5856 1247991911.216563 close(25)  = 0 
5856 1247991911.217258 munmap(0x2a26000, 806536) = 0 
5856 1247991911.217333 open("/opt/gnome//lib/f-spot/libfspotraw.so.0.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.217476 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.217548 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.217640 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.217708 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.217798 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.217866 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.218135 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.218215 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.218307 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.218398 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.218490 open("/opt/gnome//lib/f-spot/libfspotraw.so.0", O_RDONLY) = 25 
5856 1247991911.218556 read(25, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000\277\0\0004\0\0\0\\"..., 512) = 512 
5856 1247991911.218653 fstat64(25, {st_mode=S_IFREG|0755, st_size=923041, ...}) = 0 
5856 1247991911.218741 mmap2(NULL, 806536, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 25, 0) = 0x2a26000 
5856 1247991911.218809 mmap2(0x2a99000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 25, 0x72) = 0x2a99000 
5856 1247991911.218872 mmap2(0x2a9f000, 310920, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2a9f000 
5856 1247991911.218924 close(25)  = 0 
5856 1247991911.219514 munmap(0x2a26000, 806536) = 0 
5856 1247991911.219583 open("/opt/gnome//lib/f-spot/libfspotraw.so.0.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.219697 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.219769 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.219859 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.219927 open("./lib/opt/gnome//lib/f-spot/libfspotraw.so.0.so.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.220584 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0", O_RDONLY) = -1 ENOENT (No such file or directory) 
5856 1247991911.220666 open("lib/opt/gnome//lib/f-spot/libfspotraw.so.0.la", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) 
5856 1247991911.224316 write(1, "\33[93m"..., 5) = 5 
5856 1247991911.224531 gettimeofday({1247991911, 224545}, NULL) = 0 
5856 1247991911.224583 gettimeofday({1247991911, 224595}, NULL) = 0 
5856 1247991911.224625 gettimeofday({1247991911, 224637}, NULL) = 0 
5856 1247991911.224667 gettimeofday({1247991911, 224679}, NULL) = 0 
5856 1247991911.224737 write(1, "[Warn 10:25:11.224]"..., 20) = 20 
5856 1247991911.224825 write(1, "\33[0m"..., 4) = 4 
5856 1247991911.224949 write(1, " Caught an exception - /opt/gnome"..., 1024) = 1024 
5856 1247991911.225511 write(1, "amming/Gnome/f-spot/src/PhotoImag"..., 248) = 248 
5856 1247991911.225674 write(1, "\n"..., 1) = 1 

Il apparaît comme si elle trouve la bibliothèque, mais ignore alors ce fait et continue pour sonder toutes sortes de fichiers inexistants. Quelqu'un sait-il pourquoi?

Answer 1

Vous pouvez toujours déboguer ces problèmes avec cette astuce (comme indiqué sur la page de manuel):

MONO_LOG_LEVEL = "debug" MONO_LOG_MASK = "dll" glue.exe mono

Answer 2

D'accord, je l'ai compris. Apparemment, il donne également une exception DllNotFoundException s'il y a une erreur de liaison avec la bibliothèque native. Donc, essayez toujours d'utiliser d'abord la bibliothèque native du code natif, avant de l'invoquer. Cela montrera les erreurs.