python - How CFFI use the c file in a certain directory? -


i learning call c in python program cffi , write c file named 'add.c' below :

float add(float f1, float f2) {     return f1 + f2; }

and python file named 'demo.py' call add method in 'add.c':

from cffi import ffi  ffi = ffi() ffi.cdef("""    float(float, float); """)  c = ffi.verify("""    #include 'add.c'  """, libraries=[] )  sum = c.add(1.9, 2.3) print sum

when run demo.py, error add.c file cannot found. why file add.c cannot found , how can fix it?

i able reproduce error following specific error message.

__pycache__/_cffi__x46e30051x63be181b.c:157:20: fatal error: add.c: no such file or  directory     #include "add.c"

it seems cffi trying compile file inside __pycache__ subdirectory, while add.c in current directory. fix use relative path 

 #include "../add.c"

however, once fixed that, declaration incorrect, fixed well, , following code produces correct results.

from cffi import ffi  ffi = ffi() ffi.cdef("""    float add(float f1, float f2); """)  c = ffi.verify("""    #include "../add.c"  """, libraries=[] )  sum = c.add(1.9, 2.3) print sum

Comments

Post a Comment

Popular posts from this blog

apache - Remove .php and add trailing slash in url using htaccess not loading css -

i have add following code htaccess file removing .php extension , add trailing slash urls. worked fine reduced page loading speed , css code not loading @ all. pages ugly. please help rewriteengine on rewritebase / ## hide .php extension snippet # externally redirect /dir/foo.php /dir/foo rewritecond %{the_request} ^[a-z]{3,}\s([^.]+)\.php [nc] rewriterule ^ %1/ [r,l] # add trailing slash rewritecond %{request_filename} !-f rewritecond %{request_uri} !/$ rewriterule . %{request_uri}/ [l,r=301] # internally forward /dir/foo /dir/foo.php rewritecond %{request_filename} !-d rewritecond %{request_filename}.php -f rewriterule ^(.*?)/?$ $1.php [l] we can rewrite urls using .htaccess files. before writing in .htaccess files need verify kind of server using. can check server adding a <?php phpinfo(); ?> in php page. ensure mod_rewrite module enabled in apache server. can identified checking phpinfo included page. common methods used url rewriting follows ...
Read more

inno setup - TLabel or TNewStaticText - change .Font.Style on Focus like Cursor changes with .Cursor -

is possible change .font.style on focus tlabel or tnewstatictext happens cursor when use .cursor ? there no built-in support track mouse hovering in inno setup @ time. however, intercepting window procedure of controls can track yourself. following example need innocallback library: [setup] appname=my program appversion=1.5 defaultdirname={pf}\my program outputdir=userdocs:inno setup examples output [files] source: "innocallback.dll"; destdir: "{tmp}"; flags: dontcopy [code] #ifdef unicode #define aw "w" #else #define aw "a" #endif const gwl_wndproc = -4; wm_mousemove = $0200; type wparam = uint_ptr; lparam = longint; lresult = longint; twindowproc = function(hwnd: hwnd; umsg: uint; wparam: wparam; lparam: lparam): lresult; function setcapture(hwnd: hwnd): hwnd; external 'setcapture@user32.dll stdcall'; function releasecapture: bool; external 'releasecapture@user32.dll stdcall'; func...
Read more