cTYPES manipulating Python and C + + dll-pass struct pointers

CMakeLists.txt

# project (project name) project (blog-3123958139-1) # add_library (link library name SHARED link library code) add_library (Dll_ shared Dll_.cpp)

Dll_.cpp

#include <iostream>using namespacestd;//C + + struct-Body definitionstructCpp_struck_ {//stock Code, String    Char*stock_name_; //date, array of strings    Char*stock_date_[]; //Open and low four set price, floating-point array    Doublestock_open_[]; Doublestock_high_[]; Doublestock_low_[]; Doublestock_close_[]; //volume, floating-point array    Doublestock_volume_[]; //length, integral type    intStock_len_; intMa_len_;};//declaring a function exported as a standard C formatextern "C" {//passing in struct pointers, outgoing struct-body pointersCpp_struck_ *dll_function_1 (Cpp_struck_ *py_struck_pointer_) {    /** Data Processing Section ... * * **/Cpp_struck_*Cpp_struck_pointer_; Cpp_struck_pointer_=Py_struck_pointer_; returncpp_struck_pointer_;}}

test_dll_.py

ImportTushare fromcTYPESImport*#Download test DataSh_data_frame_ = Tushare.get_hist_data ('SH') Stock_name_='SH'Stock_date_=Sh_data_frame_.index.valuesstock_open_= sh_data_frame_['Open'].valuesstock_high_= sh_data_frame_[' High'].valuesstock_low_= sh_data_frame_[' Low'].valuesstock_close_= sh_data_frame_['Close'].valuesstock_volume_= sh_data_frame_['Volume'].valuesstock_len_=Len (sh_data_frame_) Ma_len_= 2#print old data as a comparisonPrint("Old_date_ =", List (stock_date_))Print("Old_open_ =", List (stock_open_))#python struct-body definitionclasspy_struct_ (Structure): _fields_= [("stock_name_", c_wchar_p),#Note that the string format needs to be c_wchar_p instead of c_char_p("Stock_date_", C_wchar_p *stock_len_), ("Stock_open_", c_double *stock_len_), ("Stock_high_", c_double *stock_len_), ("Stock_low_", c_double *stock_len_), ("Stock_close_", c_double *stock_len_), ("stock_volume_", c_double *stock_len_), ("Stock_len_", C_int), ("Ma_len_", C_int)]#python struct instantiation, initializingPy_struct_1 =py_struct_ () py_struct_1.stock_name_=Stock_name_py_struct_1.stock_date_= (C_wchar_p * stock_len_) (*stock_date_) Py_struct_1.stock_open_= (C_double * stock_len_) (*Stock_open_)#Incoming Pointer instancePy_struct_1_pointer_ =ByRef (py_struct_1)#Get DLL HandleH_dll_ =Cdll ('c:\\users\\perelman\\. Clion2016.1\\system\\cmake\\generated\\blog-3123958139-1-6c04ac5e\\6c04ac5e\\debug\\libdll_.dll')#defines the DLL return value type as a python struct-body pointerH_dll_.dll_function_1.restype =POINTER (py_struct_)#returns the DLL struct-body pointerCpp_struct_pointer_ =h_dll_.dll_function_1 (py_struct_1_pointer_)#structure pointer fetching contentCpp_struct_contents_ =cpp_struct_pointer_.contents#save result as Python list formatNew_date_ = [] forValueinchCpp_struct_contents_.stock_date_: New_date_.append (value)Print("New_date_ =", New_date_)#save result as Python list formatNew_open_ = [] forValueinchCpp_struct_contents_.stock_open_: New_open_.append (value)Print("New_open_ =", New_open_)

cTYPES manipulating Python and C + + dll-pass struct pointers