Error "(null).dll was not found"

New to FreeBASIC? Post your questions here.
Iczer
Posts: 37
Joined: Jul 04, 2017 18:09

Error "(null).dll was not found"

Postby Iczer » Dec 31, 2017 11:59

I'm tried to compile latest pcre (v 8.41) and libxml2 (v 2.9.7) libs to replace my current {pcre (v 8.39) and libxml2 (v 2.9.3)} with mingw-w64 (x86_64-7.2.0-win32-seh-rt_v5-rev1) and CMake. Somehow it got successful.
new pcre libs got pretty same size, but libxml2 become much smaller.
I replaced original libs with fresh-baked and fbide compiled my application without any complains.
But after i run my application, I got "This application failed to start because (null).dll was not found." error.
Trying to debug i returned original libs back, but runtime error persist. How I can debug this problem? I think some path was changed, so at compile time everything OK, but at runtime cannot find some library... but why library name is (null)?..
srvaldez
Posts: 1560
Joined: Sep 25, 2005 21:54

Re: Error "(null).dll was not found"

Postby srvaldez » Dec 31, 2017 12:17

this may be a silly question so please don't be offended, after restoring the dll's did you recompile your application?
dkl
Site Admin
Posts: 3196
Joined: Jul 28, 2005 14:45
Location: Germany

Re: Error "(null).dll was not found"

Postby dkl » Dec 31, 2017 12:29

I think I saw this before with libfoo.dll.a import libraries when the LIBRARY "foo.dll" part was missing from the .def file passed to dlltool. In that case it depends on how the DLL and its import library (if any) are built.

You could try running objdump (from MinGW-w64 toolchain) on the executable:
> objdump -x myexe.exe
...
The Import Tables (interpreted .idata section contents)
...
DLL Name: KERNEL32.dll
...
DLL Name: msvcrt.dll
...


It should list the DLL dependencies. Maybe it's possible to see one of pcre or libxml2 (while the other is (null).dll, unless both are (null).dll).
Iczer
Posts: 37
Joined: Jul 04, 2017 18:09

Re: Error "(null).dll was not found"

Postby Iczer » Dec 31, 2017 12:31

yes - I even tried to recompile with "-g" option and debug, but got "No debug info found. Compile with the -g option."

dkl
I will try that, thanks!
Iczer
Posts: 37
Joined: Jul 04, 2017 18:09

Re: Error "(null).dll was not found"

Postby Iczer » Dec 31, 2017 12:53

there was not pcre section (i think because it static library?) but culprit was sqlite dll actually:

Code: Select all

   DLL Name: (null)
   vma:  Hint/Ord Member-Name Bound-To
   138cd0      31  sqlite3_busy_timeout
   138ce8      35  sqlite3_close
   138cf8      41  sqlite3_column_bytes16
   138d12      42  sqlite3_column_count
   138d2a      56  sqlite3_column_text
   138d40      57  sqlite3_column_text16
   138d58      89  sqlite3_errmsg
   138d6a      90  sqlite3_errmsg16
   138d7e      91  sqlite3_errstr
   138d90      92  sqlite3_exec
   138da0      98  sqlite3_finalize
   138db4      99  sqlite3_free
   138dc4     100  sqlite3_free_table
   138dda     104  sqlite3_get_table
   138dee     106  sqlite3_initialize
   138e04     119  sqlite3_mprintf
   138e16     127  sqlite3_open
   138e26     129  sqlite3_open_v2
   138e38     137  sqlite3_prepare_v2
   138e4e     145  sqlite3_reset
   138e5e     183  sqlite3_step


so now I should deal with sqlite? It exist in "windows\system32" directory and registered with : \regsvr32.exe /s /n " & sSQLiteDLL_PathTo_Installed & "
Iczer
Posts: 37
Joined: Jul 04, 2017 18:09

Re: Error "(null).dll was not found"

Postby Iczer » Dec 31, 2017 14:27

problem solved - as dkl said - LIBRARY "sqlite3.dll" section was missing from sqlite3.def file, so remake it, recompiled and error disappeared
thanks!

Return to “Beginners”

Who is online

Users browsing this forum: No registered users and 1 guest