我知道之前已经问过这个问题。我已经尝试了实现答案，但仍然遇到了这个错误。如果有人有任何建议，我们将非常感激。下面是主文件，头文件和源文件。如果您需要任何其他信息，请与我们联系。谢谢！
的main.cpp
/*
* File: main.cpp
* Author: agoodkind
*
* Reads in a .list file from IMDB
* Prompts user for Actor or Movie lookup
* Iterates through file
* Returns results of query
*
*/
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <string>
#include "ActorResume.h"
using namespace std;
// function prototypes
void printmenu(void);
void createMovieList(fstream &infile);
void movieCastLookup(void);
void costarLookup(ActorResume &, fstream &infile);
int main() {
char choice; //user menu selection
bool not_done = true; // loop control flag
// create input file stream
fstream infile;
// CHANGE BACK TO NON-TEST!!
infile.open("/Users/agoodkind/Documents/CUNY/Analysis_and_Design/Assignments/Assignment1/actorsTEST.2010.list", ios::in);
do {
printmenu();
cin >> choice;
switch(choice)
{
case 'q':
case 'Q':
infile.close();
not_done = false;
break;
case 'a':
case 'A':
createMovieList(infile);
break;
case 'm':
case 'M':
movieCastLookup();
break;
default:
cout << endl << "Error: '" << choice << "' is an invalid selection - try again" << endl;
break;
} //close switch
} // close do() loop
// exit program
while (not_done);
return 0;
} // close main()
/* Function printmenu()
* Input:
* none
* Process:
* Prints the menu of query choices
* Output:
* Prints the menu of query choices
*/
void printmenu(void) {
cout << endl << endl;
cout << "Select one of the following options:" << endl;
cout << "\t****************************" << endl;
cout << "\t List of Queries " << endl;
cout << "\t****************************" << endl;
cout << "\t A -- Look Up Actors' Costars" << endl;
cout << "\t M -- Movie Cast List" << endl;
cout << "\t Q -- Quit" << endl;
cout << endl << "\tEnter your selection: ";
return;
}
/* Function costarLookup()
* Input:
* Actor name
* Process:
* Looks up all actors also in actor's movieList
* Output:
* Prints list of costars
*/
void createMovieList(fstream &infile) {
string actorName; // actor's name to be queried
cout << endl << "Enter Actor Name: ";
cin >> actorName;
ActorResume *ar = new ActorResume(actorName);
// add movie list to ActorCostars ADT created above
// string for readline()
string line;
if (infile.is_open()) { //error checking to ensure file is open
infile.seekg(0, ios::beg); // to be safe, reset get() to beginning of file
while (infile.good()) { //error checking to ensure file is being read AND not end-of-file
bool actor_found = false; // checks if actor name has been found
getline(infile,line);
if (line == actorName) {
actor_found = true;
}
// add movies to actor's movieList
while (actor_found && line[0] == '\t') {
ar.addMovie(line);
}
}
}
costarLookup(*ar, infile);
delete ar;
} // close costarLookup()
void costarLookup(ActorResume actRes, fstream &infile) {
// string for readline()
string line;
// vector to store costar names
vector<string> costars;
if (infile.is_open()) { // error checking to ensure file is open
infile.seekg(0, ios::beg); // reset get() to beginning of file
while (infile.good()) { // error checking to ensure file is being read AND not end-of-file
// while looping through file, store each actor's name
string actorName;
getline(infile,line);
// check if first character is an alphanumeric character
if (line[0] != '\t' && line[0] != NULL) {
actorName = line;
}
// add actors name to list of costars
if (actRes.movieInList(line)) {
costars.push_back(actorName);
}
}
}
if (costars.size() == 0) {
cout << "No costars found";
}
else if (costars.size() > 0) {
cout << "Costars of " << actRes.getActorName() << ": " << endl;
for (int i = 0; i < costars.size(); i++) {
cout << "* " << costars[i];
}
}
}
ActorResume.h
/*
* ActorResume Specification Class
*/
#ifndef ACTORRESUME_H
#define ACTORRESUME_H
#include <iostream>
#include <string>
#include <vector>
#include <cstring>
using namespace std;
// ActorResume declaration
class ActorResume {
private:
string actorName;
vector<string> movieList;
public:
//default constructor
ActorResume() {
// actorName = NULL;
movieList.clear();
}
//typical constructor implemented for creating ActorResume
ActorResume(string aName) {
actorName = aName;
movieList.clear();
}
// member functions
void addMovie(string);
string getActorName();
bool movieInList(string);
// void printMovieList();
};
#endif /* ACTORRESUME_H */
ActorResume.cpp
// ActorResume Implementation
#include <iostream>
#include <string>
#include <vector>
#include <cstring>
#include "ActorResume.h"
/*
* ActorResume function addMovie()
* Input:
* Movie Name
* Process:
* adds movie to movieList
* Output:
* None
*/
void ActorResume::addMovie(string movie) {
movieList.push_back(movie);
// return;
}
/*
* ActorReusme function getActorName()
* Input:
* None
* Process:
* returns actor's name
* Output:
* String of actor's name
*/
string ActorResume::getActorName() {
return actorName;
}
/*
* ActorResume function movieInList()
* Input:
* string to search for
* Process:
* searches movieList vector for string
* Output:
* If movie is found, true
* Else, false
*/
bool ActorResume::movieInList(string movie) {
for(size_t i = movieList.size() - 1; i != (size_t)-1; i--) {
if (movieList[i] == movie) {
return true;
}
}
return false;
}
错误：
main.cpp: In function 'void createMovieList(std::fstream&)':
main.cpp:124: error: request for member 'addMovie' in 'ar', which is of non-class type 'ActorResume*'
答案 0 :(得分：4)
'f'中成员'Foo'的错误请求，属于非类型'Foo *'
错误告诉您需要知道的一切。
ActorResume *ar = new ActorResume(actorName);
ar是指向ActorResume对象的指针，而不是ActorResume对象本身。所以......
ar.addMovie(line);
应该是
ar->addMovie(line);
使用->运算符来反转指针并访问它引用的对象的成员，而不是点运算符。指针没有成员。