[英]passing vector from a c++ dll in python ctypes
I have a .dll that was written in c++ with extern "C"
, this function is called BOLHA and returns a double. 我有一个用c ++用extern "C"
编写的.dll,此函数称为BOLHA,并返回一个double。
the problem is that BOLHA has a vector<double>
in the argument. 问题在于BOLHA在参数中有一个vector<double>
。
extern "C" myDLL_API double BOLHA(vector<double> OI);
in fact due the extern "C"
I believe that this vector turns into a pointer and so I tried to load the function as follows. 实际上由于extern "C"
我相信此向量变成了指针,因此我尝试按以下方式加载该函数。
mydll = cdll.LoadLibrary("_DLL.dll")
func = mydll.BOLHA
func.argtypes = [POINTER(c_double)]
func.restype = c_double
returnarray = (c_double * 2)(0.047948, 0.005994)
func(returnarray)
but I get the following error. 但出现以下错误。
[Error -529697949] Windows Error 0xE06D7363
in fact due the extern "C" I believe that this vector turns into a pointer 实际上由于extern“ C”我相信这个向量变成了一个指针
This is wrong. 错了 there is no mechanism that makes this possible by default. 默认情况下,没有机制使之成为可能。 Your BOLHA()
function needs to receive a double*
and then convert it to vector<double>
or just use the raw pointer. 您的BOLHA()
函数需要接收一个double*
,然后将其转换为vector<double>
或仅使用原始指针。
If you want this to work with the vector<double>
signature, you needs something to do the work of converting the pointer to a vector. 如果希望它与vector<double>
签名一起使用,则需要完成将指针转换为矢量的工作。 boost::python
can do that but that would require that the DLL you're working with would be a python module and not just any DLL. boost::python
可以做到这一点,但这需要您使用的DLL是python模块,而不仅仅是任何DLL。
if you have the function: 如果您具有以下功能:
extern "C" myDLL_API double BOLHA(vector<double> OI);
you'll need to declare a new function: 您需要声明一个新函数:
extern "C" myDLL_API double BOLHA_raw(double* ptr, int size) {
vector<double> v(ptr, ptr+size);
return BOLHA(v);
}
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