From c3b92c920dd1060e9ab00678d0c7c88cc6dbbbb0 Mon Sep 17 00:00:00 2001 From: David Hendriks <davidhendriks93@gmail.com> Date: Thu, 31 Oct 2019 10:19:01 +0000 Subject: [PATCH] updated ctypes attempt. next step is trying to figure out how to pass a pointer through something via something --- ctypes/compile.sh | 2 ++ ctypes/libmean.so.1 | Bin 0 -> 7528 bytes ctypes/main.py | 28 +++++++++++++++++ ctypes/mean.c | 5 +++ ctypes/mean.h | 3 ++ python-c-api_solution/demomodule.c | 47 +++++++++++++++++++++++++++-- 6 files changed, 83 insertions(+), 2 deletions(-) create mode 100644 ctypes/compile.sh create mode 100755 ctypes/libmean.so.1 create mode 100644 ctypes/main.py create mode 100644 ctypes/mean.c create mode 100644 ctypes/mean.h diff --git a/ctypes/compile.sh b/ctypes/compile.sh new file mode 100644 index 0000000..736d146 --- /dev/null +++ b/ctypes/compile.sh @@ -0,0 +1,2 @@ +# Compile a shared library +gcc -shared -o libmean.so.1 mean.c \ No newline at end of file diff --git a/ctypes/libmean.so.1 b/ctypes/libmean.so.1 new file mode 100755 index 0000000000000000000000000000000000000000..1ede0ce64eb59a8cf19dfffde096fbdf7fe4c32d GIT binary patch literal 7528 zcmeHMU2IfE6rSz2Q2Mvak6L~bR#O#Ju0=r#SZOI+E`$QsHbFzZ+;(@{Ci?@scOxYP zHv$G@8XF&s`k;L=@}e<5D2XxhV+c_bHO2(q8VyN_7y+XxFI~@>JKu75cGsU5pE}9C zXXcypotb;?%-u6*UkvZ+uJZW=ieEe>xHVbrA|0w@)jg_0qC>Qa`E*|@nx$^dovxDF z{&_A0DMUyDJO+2=nq-q?NLC;x)s#*v30@UxF>gZgCKL~HuhNICl~#q|$KmUe>epq9 z(t~7OE_<&!5w4$652;J&LxT4-@zkSBJO6YGDurG(UM0We)chgg9v*iIU4FW@@9r1% zUxZs`u7C6X?Ke)oGrV}!%DT(H?&Kl3pC5&JJik+CL%xpcj@69Kr>l;xt>GW9fA;h1 zN6(DkY>K`1_R%Yc_O1Bkhu@UPNuf;XB`j11Z>xZ>sDSglLUidRMnF(37NKCMsB28( zOT;P-XMZlDCp>@`qFA=X7l<S3eLkS@1j!(IP`7`#)UOkhN?)l9VOhh8RMN^gcG|Hl zVT~q79bv^t2x~`Qj}?igqr;;aCz|f->58Y4(LQ@H9(DW5_gF)RZ8l)XM~_5BB5Egv z6^+=AO=AsaGVV|WB_lKm>=Uf-gKB=K)P4Zos_<szAK++D1w!(XcrCE+QKmgO?>Uqk z9-P+_%8Up1y4*Z|z1DoSX1qQm%#&xGs{D86@h@vHfF|<mU!t!3{U_)iSlL0fom7iW zK*1buA0wdO9IrV<(%d*>zH-%BN+uuUCYfv;$WO(Lz{(SnGH`*d+-VbkBP))tXZ?P2 z^(^ttbF+T)l^f={=`E)3qWS%-(@X}h)VT&5*kC1lx%O+MCbEy3$J^iKT0hUH!F;v- zD{4)*=kxh#lWrGl&QaUP)5-C~e!oB_x4G&A*J7l>#9M)d;TgL1+_)78a&2FjYmL0> zZUvq{H*i7vugGI;O?3E{`!}~xh2O!Y*?hi(<Ykg0B+rxe97!(xP2l1?(kpz2gTCbr z^J^#QMKhQ8V2(KQ+tU>6Zff2csDGh0C$=ox{Lteq_c4$8G;J|LdRRM*Gj~5-n`kV# zhdP^rFIROn&a-I%R+uYu9+>mMoCoGSFz10e56pR>f(H<{B2H~kdWhQ_RU7g5Qq@NM zyIi#qb1YMB#K9b=a6$hcv-uRaZ>V4wVSSqlW;qV#(yD^qI=3l~DOs;%vyz1vSjE?T zhT?KYbzt1nE-V%(3I6T8JD-9b)&GA9oSXIWa6Z`H)wL<Ks(&z>bh4oh#yX>Q&DyMN ztv$B3&1hX`tX=Kmx`ooVpH3J!cYAyNqN?ydigAD8Jrv{B0`IFBuPOMw7%x2sa=)KW zyt!(xrd#*ZYMCgDFDT?iyevPRnz25M@p|zQ7MQ2QFB%H@1P@H}X%tgs^_vRky<+`< zz&bC+gOnc$c_CT%i-iK`J#VL<PRc?%KXbpI&f8cA#rmb^WLN(#ubQm$Hmepl^LhvG z^D5d6lbWBK6h5Wl_bMFU3E0~}6`$wauC}%4mUyXu_?*w<;=2PooJa79Qa`^*c)9sk zdaie+okp<_9})~u!OjO#zw~{5BJt9E$9aY8@8w&<MVWQ=lhiMLzcYk~=+eu4da!bN zlSYY`=1mq69@33a`;iK`NqD(DOCRBj%Iu@(q<*O%Y-LB!`@{$@Hy<&Sb}~*j7Bhy# zoz#rwB&;D$&SWUZ5=mLZ@zkIlw<1m|ow4lfVKJ0S9E?YuXvEm?#KsNfm1NS#veRjM zjFK}>dQ8O9b|Pv;vWdhPQ9Lb~B`Q+oG!IS5vbuXad%{+D_cl%@ZF_ciXU~o<f+=|f z(28VI)`*>qa2m;?B%c*F70uk%E3ECi_H6CkW$o$iekR;!^>uFD6(&=~StU13<>r<+ zOI1D-^>_IzZz{^ocBvc{=cTlym@qP93CA8J>7-pbf?6`=M2+EO))>r=#v^M+BSN-D z?97NTB4bHny3$DtBOQ&~3<^W0*^Gm6#~4mI!f>L8=`QDCq*F3kW<*Dn%SR$aMa!kS zzIPd@lU+M8Iz;2A9JWlua?;J9oSQIc0VL?9mRaHd4dOV3V*?dd6n+Qsd)T6x(>{N~ zp#DE8RsbLI3*?iEk2nHx2h6rng<}`+5#K=8(!Sxs<8l>z#3>zwv2F12`wNNqh*V@z z=Fk)-)z~)ph>su<AL;YQ_?%y6oA|6AP!59h{5?Th?pU&-ZXc8M@^gw0iTpb_XhZJP z_=pc6;V<yfhO{;Qq#7SmP7Y*}7#Gm6&R1~);ts@>&{yWs6#To#&kz42E`h{6LD1V- zjbG`15b*W!k86CyIgm#|R8k**oN$f}us#s~=NP1->!S_%7U=}&0v~bHsej3TkGQ<{ zz(;(A|DpD>bE)9DF)rRC=So=xe8gc>JSi$6dB1Z5AM!)$^70Guni>H61Qx)9{8Zy3 zerQ&F=;?g4Kc@=oVE*`@BvgT~+yS~cPc_C`3y50*|6vUW-z%|py{dcF_-`u5^LOAu ny6`;k3-1ri-OHa=3GyrkQk`0pBIok_0Z!FZ`PvnQyUza$Vw*R~ literal 0 HcmV?d00001 diff --git a/ctypes/main.py b/ctypes/main.py new file mode 100644 index 0000000..d5549a5 --- /dev/null +++ b/ctypes/main.py @@ -0,0 +1,28 @@ +# https://solarianprogrammer.com/2019/07/18/python-using-c-cpp-libraries-ctypes/ +# https://gist.github.com/elyezer/7099291 + +# https://www.geeksforgeeks.org/turning-a-function-pointer-to-callable/ +# https://stackoverflow.com/questions/9420673/is-it-possible-to-compile-c-code-using-python +# https://documentation.help/Python-3.2.1/ctypes.html + +import ctypes +import os +import subprocess + +def buildLibrary(): + + # store the return code of the c program(return 0) + # and display the output + s = subprocess.check_call("bash compile.sh", shell=True) + print("return code:\n{}".format(s)) + +buildLibrary() + + +libmean = ctypes.CDLL("libmean.so.1") # loads the shared library +libmean.mean.restype = ctypes.c_double # define mean function return type +print(libmean.mean) +print(libmean.mean(ctypes.c_double(10), ctypes.c_double(3))) # call mean function needs cast arg types +libmean.mean.argtypes = [ctypes.c_double, ctypes.c_double] # define arguments types +print(libmean.mean(10, 3)) # call mean function does not need cast arg types +print(type(libmean.mean(10, 5))) \ No newline at end of file diff --git a/ctypes/mean.c b/ctypes/mean.c new file mode 100644 index 0000000..12d80b0 --- /dev/null +++ b/ctypes/mean.c @@ -0,0 +1,5 @@ +#include "mean.h" + +double mean(double a, double b) { + return (a+b)/2; +} \ No newline at end of file diff --git a/ctypes/mean.h b/ctypes/mean.h new file mode 100644 index 0000000..a52ef61 --- /dev/null +++ b/ctypes/mean.h @@ -0,0 +1,3 @@ + +// Returns the mean of passed parameters +double mean(double, double); \ No newline at end of file diff --git a/python-c-api_solution/demomodule.c b/python-c-api_solution/demomodule.c index 1657aca..d323623 100644 --- a/python-c-api_solution/demomodule.c +++ b/python-c-api_solution/demomodule.c @@ -32,6 +32,30 @@ static PyObject *DemoLib_MakeStr(PyObject *self, PyObject *args) { return Py_BuildValue("s", result); } + +static PyObject *DemoLib_AddNumberWithPointer(PyObject *self, PyObject *args) { + int *number_1; + int *number_2; + if (!PyArg_ParseTuple(args, "ii", &number_1, &number_2)) { + return NULL; + } + + int result; + int (*pf) (int, int); + pf = &add_number; + result = add_number_using_pointer(pf, number_1, number_2); + return Py_BuildValue("i", result); +} + + + + + + + + + + // module's function table static PyMethodDef DemoLib_FunctionsTable[] = { { @@ -39,16 +63,35 @@ static PyMethodDef DemoLib_FunctionsTable[] = { DemoLib_AddNumber, // C wrapper function METH_VARARGS, // received variable args (but really just 1) "adds two numbers" // documentation - }, { + }, + + + { + "add_number_with_pointer", // name exposed to Python + DemoLib_AddNumberWithPointer, // C wrapper function + METH_VARARGS, // received variable args (but really just 1) + "adds two numbers via a pointer function" // documentation + }, + + + { "make_str", // name exposed to Python DemoLib_MakeStr, // C wrapper function METH_VARARGS, // received variable args (but really just 1) "adds two strings" // documentation - }, { + }, + + + { NULL, NULL, 0, NULL } }; + + + + + // modules definition static struct PyModuleDef DemoLib_Module = { PyModuleDef_HEAD_INIT, -- GitLab