 Python ctypes not loading dynamic library on Mac OS X
By : Weller Miranda
Date : March 29 2020, 07:55 AM
around this issue Nope. As the error message says, there's an architecture mismatch between your python and librepeater.dylib file. Use file to check what the architecture of librepeater.dylib is; your python is going to be built using one of the ones not listed.
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Python and C interop: Dynamic resizing of ctypes
By : user4221882
Date : March 29 2020, 07:55 AM
help you fix your problem Here's an example of what we were discussing. This code expects the caller to allocate the buffer. Test code (Windows) code :
// IN: test=pre-allocated buffer.
// IN: size=size of pre-allocated buffer.
// RETURNS: 0 and size set to required size.
// 1 and size set to size used.
__declspec(dllexport) int testout(void *pdata, int *psize)
{
unsigned char * p = (unsigned char *)pdata;
if (*psize < 5)
{
*psize = 5; // set size required
return 0; // fail
}
p[0] = 123;
p[1] = 255;
p[2] = 237;
p[3] = 12;
p[4] = 222;
*psize = 5; // indicate size used
return 1; // pass
}
from ctypes import *
test = CDLL('test')
size = c_int(0)
test.testout.argtypes=[c_void_p,POINTER(c_int)]
print "Result of NULL pointer and zero size:",test.testout(None,byref(size))
print "Returned size:",size.value
mem = (c_ubyte * 2)()
size = c_int(sizeof(mem))
print "sizeof(mem):",size.value
print "Result of small buffer:",test.testout(byref(mem),byref(size))
print "Returned size:",size.value
mem = (c_ubyte * size.value)()
print "Result of exact size buffer:",test.testout(byref(mem),byref(size))
print "Returned size:",size.value
for i in range(size.value):
print mem[i]
mem = (c_ubyte * 20)()
size = c_int(20)
print "Result of bigger buffer:",test.testout(byref(mem),byref(size))
print "Returned size:",size.value
for i in range(size.value):
print mem[i]
Result of NULL pointer and zero size: 0
Returned size: 5
sizeof(mem): 2
Result of small buffer: 0
Returned size: 5
Result of exact size buffer: 1
Returned size: 5
123
255
237
12
222
Result of bigger buffer: 1
Returned size: 5
123
255
237
12
222
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Wrapping blake hash function C implementation into Python using ctypes module, simple python ctypes testvector script al
By : Spacy
Date : March 29 2020, 07:55 AM
This might help you At the end of the function BitSequence * bl(char *input), The return value output is a local variable that won't exist after the function exits.
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 Python Ctypes and FFTW Linking
By : Yang Gao
Date : March 29 2020, 07:55 AM
I wish this helpful for you On the advice of a coworker I searched for and manually deleted all of the fftw related dlls, then made and installed again using the correct flags -fpic. It seems the fftw uninstall script does not completely remove previous versions of fftw.
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ctypes Python dynamic function call
By : Parker
Date : March 29 2020, 07:55 AM
Does that help To invoke the function using it's name as a string, you this can do this code :
...
fName = "printHello"
test[fName]()
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code :
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