[英]structures with functions and python ctypes
我有一个ac库我想用python 2.7 ctypes包装。
typedef struct SRSLTE_API{
void *ptr;
uint32_t R;
uint32_t K;
uint32_t framebits;
bool tail_biting;
float gain_quant;
int16_t gain_quant_s;
int (*decode) (void*, uint8_t*, uint8_t*, uint32_t);
int (*decode_f) (void*, float*, uint8_t*, uint32_t);
void (*free) (void*);
uint8_t *tmp;
uint8_t *symbols_uc;
}srslte_viterbi_t;
如何在python中创建此结构? 这就是我现在拥有的。
from ctypes import *
class srslte_viterbi_t(Structure):
_fields_ = [("ptr", c_void_p),
("R", c_uint),
("K", c_uint),
("framebits", c_uint),
("tail_biting", c_bool),
("gain_quant", c_float),
("gain_quant_s", c_short),
("decode", POINTER(c_int)),
("decode_f", POINTER(c_int)),
("free", c_void_p),
("tmp", POINTER(c_ubyte)),
("symbols_uc", POINTER(c_ubyte))
]
viterbi_t = srslte_viterbi_t(None, c_uint(0), c_uint(0), c_uint(0),
c_bool(False), c_float(0.0), c_short(0), None, None, None, None, None)
此结构编译但未给出正确的结果。 我担心我没有正确分配解码功能? 什么是线
int (*decode) (void*, uint8_t*, uint8_t*, uint32_t);
无论如何做一个结构?
这是结构的正确定义:
from ctypes import *
class srslte_viterbi_t(Structure):
_fields_ = [
('ptr',c_void_p),
('R',c_uint32),
('K',c_uint32),
('framebits',c_uint32),
('tail_biting',c_bool),
('gain_quant',c_float),
('gain_quant_s',c_int16),
('decode',CFUNCTYPE(c_int,c_void_p,POINTER(c_uint8),POINTER(c_uint8),c_uint32)),
('decode_f',CFUNCTYPE(c_int,c_void_p,POINTER(c_float),POINTER(c_uint8),c_uint32)),
('free',CFUNCTYPE(None,c_void_p)),
('tmp',POINTER(c_uint8)),
('symbols_uc',POINTER(c_uint8))]
viterbi_t = srslte_viterbi_t()
实例化时,结构由ctypes
零初始化。
结构中的解码行是函数指针。 CFUNCTYPE
用于定义函数指针返回类型和参数。
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