struct

问题 I have two different C functions and I would like to use them with ctypes in Python. One function is establishing a connection and returns a pointer to an truct. The pointer shall be used as an argument in the second function to reuse the established connection. C Code: customStruct * connect() { customStruct *obj = connection_helper(); return obj; } void foo(customStruct * obj) { foo_helper(obj); } Python code: from ctypes import * lib = CDLL("./test.dll") obj = lib.connect() lib.foo(obj)

问题 I'm dealing with code, that has multiple structures consisting of string -fields only. For example: struct record { string first; string second; string third; string Nth; }; These are currently all loaded from a database and stored in different map<string, somestruct> -- with a separate method for each. The methods are the same (except for the SQL-queries and field-names) -- the first field of each query becomes the map's index, and the subsequent ones form the structure's fields: void

问题 I have two different C functions and I would like to use them with ctypes in Python. One function is establishing a connection and returns a pointer to an truct. The pointer shall be used as an argument in the second function to reuse the established connection. C Code: customStruct * connect() { customStruct *obj = connection_helper(); return obj; } void foo(customStruct * obj) { foo_helper(obj); } Python code: from ctypes import * lib = CDLL("./test.dll") obj = lib.connect() lib.foo(obj)

问题 The way structures allocate memory is that :- struct mys { int a , b, c ; }; As we can see in structs, when I declare a struct variable say, struct mys var1 , var1 takes the sum of all the basic datatypes inside it. (12 bytes here assuming the word length is 4 bytes) printf("%d",sizeof(var1)) ; output is 4 . In enum, we have, enum myvar{ id1 , id2 , id3 }; and whenever I declare an enum variable and print its size, it only prints the size of integer(4 bytes). And the id1 ,id2, id3 would get 0

问题 I need to create a phonebook in C, with structs and linked-list. Data will be on a file. I'll store data like Name1#Surname1#Date1#Number1 Name2#Surname2#Date1#Number2 Name3#Surname3#Date1#Number3 But I couldn't split by delimiter "#" and use datas in my struct. Here is my code: #include <stdio.h> #include <locale.h> //Veri Yapısı: typedef struct kisi { char isim[50]; char soyisim[50]; int dYili; char telefon[16]; struct kisi *sonraki; }Kisi; int main() { //Türkçe çıktılarda sorun yaşamamak

问题 There is an answer in Creating a linked list without declaring node as a pointer. But I wanted to know if there were any other reasons due to which you can't create nodes as pointers, just so, to be clear. One of the reasons is that the scope of the new nodes will die outside the function-Is there no way you can solve this problem?, and Is there any other reason? 回答1: I've been using a lot of linked lists (and even more complex structures) in which no node was allocated separately on the heap

问题 Im trying to parse a string into a vector of a struct that has different variables in it. This is what I have so far but it doesnt seem to work. struct client { string PhoneNumber; string FirstName; string LastName; string Age; }; int main() { string data = getClientDatabase(); vector <client> clients; parse_string(data, clients); return 0; } string getClientDatabase() { return "(844)615-4504 Sofia Ross 57 \n" "(822)516-8895 Jenna Doh 30 \n" "(822)896-5453 Emily Saks 43 \n" } So this function

问题 We are interfacing with an externally controlled program with defined headers containing enumerations, and structures. We want to be able to interface with multiple versions of this program with as little duplication of code as possible. Each version has the same general enums and structures, but with slight modifications over time. In the ideal setup we could just conditionally include the different versions of the same header (i.e. if interfacing with version 1 #include "version1\progDefs.h

问题 We are interfacing with an externally controlled program with defined headers containing enumerations, and structures. We want to be able to interface with multiple versions of this program with as little duplication of code as possible. Each version has the same general enums and structures, but with slight modifications over time. In the ideal setup we could just conditionally include the different versions of the same header (i.e. if interfacing with version 1 #include "version1\progDefs.h

问题 We are interfacing with an externally controlled program with defined headers containing enumerations, and structures. We want to be able to interface with multiple versions of this program with as little duplication of code as possible. Each version has the same general enums and structures, but with slight modifications over time. In the ideal setup we could just conditionally include the different versions of the same header (i.e. if interfacing with version 1 #include "version1\progDefs.h