合并两个文件，无效使用非静态数据成员
Combining Two Files, Invalid use of nonstatic data member
#include <iostream>
#include <string>
class DVD {
public:
char m_strTitle[25];
int m_nYearOfRelease;
char m_strGenre[25];
char m_strRentalStatus[50];
}
void Print()
{
using namespace std;
cout << "Title" << DVD::m_strTitle << "YearOfRelease" << DVD::m_nYearOfRelease << "Genre" << DVD::m_strGenre
<< "RentalStatus" << DVD::m_strRentalStatus << endl;
}
这是我的第一个文件，它生成了 5 个无效使用非静态数据成员错误，我不太确定这意味着什么，所以如果有人能指出我正确的方向，那将不胜感激。我还想将其与另一个文件相结合，其中我声明了 10 种 DVD 类型，通常我会将它们全部作为一个文件，但我需要为我的作业做的问题是我创建一个包含 10 张 DVD 的数组并使用输入文件中的信息填充它们，所以这也是我制作的输入文件。
#include <iostream>
#include <cstring>
// Set the Info for 10 DVDs
void SetInfo(const char* strTitle, int nYearOfRelease, const char* strGenre, const char* strRentalStatus) {
strncpy(m_strTitle, strTitle, 25);
m_nYearOfRelease = nYearOfRelease;
strncpy(m_strGenre, strGenre, 25);
strncpy(m_strRentalStatus, strRentalStatus, 50);
}
int main() {
// Declare 10 DVDs
DVD cInception;
cInception.SetInfo("Inception", 2010, "Action", "In stock");
DVD cFightClub;
cFightClub.SetInfo("Fight Club", 1999, "Action/Suspense", "Due back November12th");
DVD cPulpFiction;
cPulpFiction.SetInfo("Pulp Fiction", 1994, "Action", "In Stock");
DVD cTheDarkKnight;
cTheDarkKnight.SetInfo("The Dark Knight", 2008, "Drama", "In Stock");
DVD cAmericanHustle;
cAmericanHustle.SetInfo("American Hustle", 2013, "Drama", "Due back December1st");
DVD cSilverLiningsPlaybook;
cSilverLiningsPlaybook.SetInfo("Silver Linings Playbook", 2012, "Drama/Romance", "In Stock");
DVD cTheHungerGames;
cTheHungerGames.SetInfo("The Hunger Games", 2012, "Adventure", "Due Back Today at 12pm");
DVD cFurious7;
cFurious7.SetInfo("Furious 7", 2015, "Action", "One Left in Stock");
DVD cSavingPrivateRyan;
cSavingPrivateRyan.SetInfo("Saving Private Ryan", 1998, "Drama/War", "Discontinued");
DVD cGladiator;
cGladiator.SetInfo("Gladiator", 2000, "Action", "In Stock");
// Print out DVD Info
cInception.Print();
cFightClub.Print();
cPulpFiction.Print();
cTheDarkKnight.Print();
cAmericanHustle.Print();
cSilverLiningsPlaybook.Print();
cTheHungerGames.Print();
cFurious7.Print();
cSavingPrivateRyan.Print();
cGladiator.Print();
return0;
}
您需要
void Print() {...}定义移动到DVD类定义中，以便它可以充当成员函数。然后，您不需要为每个成员DVD::前缀。
关于文件：让它工作的最简单方法是将第一个代码片段放入头文件中，第二个是源文件，您可以在其中#include该头。
你也忘记了类定义之后;，我看到了return0;，在这一点上，我停下来进一步看。
您必须将
Print()定义移动到DVD定义中，或者在DVD定义中声明它并在Print()之前添加DVD::前缀。
您不能在该上下文中使用DVD类成员来处理问题，您必须在该原则中重建Print函数以将其指定为类成员DVD SetInfo
void DVD::Print()
{
using namespace std;
cout << "Title" << m_strTitle << "YearOfRelease" << m_nYearOfRelease << "Genre" << m_strGenre <<
"RentalStatus" << m_strRentalStatus << endl;
}
整个声明定义代码。
#include <iostream>
#include <string>
class DVD
{
public:
char m_strTitle[25];
int m_nYearOfRelease;
char m_strGenre[25];
char m_strRentalStatus[50];
void Print();
void SetInfo(const char *strTitle, int nYearOfRelease, const char *strGenre, const char *strRentalStatus);
};
void DVD::Print()
{
using namespace std;
cout << "Title" << m_strTitle << "YearOfRelease" << m_nYearOfRelease << "Genre" << m_strGenre <<
"RentalStatus" << m_strRentalStatus << endl;
}
// Set the Info for 10 DVDs
// Also DVD class member function
void DVD::SetInfo(const char *strTitle, int nYearOfRelease, const char *strGenre, const char *strRentalStatus)
{
strncpy(m_strTitle, strTitle, 25);
m_nYearOfRelease = nYearOfRelease;
strncpy(m_strGenre, strGenre, 25);
strncpy(m_strRentalStatus, strRentalStatus, 50);
}
int main()
{
//Declare 10 DVDs
DVD cInception;
cInception.SetInfo("Inception", 2010, "Action", "In stock");
DVD cFightClub;
cFightClub.SetInfo("Fight Club", 1999, "Action/Suspense", "Due back November12th");
DVD cPulpFiction;
cPulpFiction.SetInfo("Pulp Fiction", 1994, "Action", "In Stock");
DVD cTheDarkKnight;
cTheDarkKnight.SetInfo("The Dark Knight", 2008, "Drama", "In Stock");
DVD cAmericanHustle;
cAmericanHustle.SetInfo("American Hustle", 2013, "Drama", "Due back December1st");
DVD cSilverLiningsPlaybook;
cSilverLiningsPlaybook.SetInfo("Silver Linings Playbook", 2012, "Drama/Romance", "In Stock");
DVD cTheHungerGames;
cTheHungerGames.SetInfo("The Hunger Games", 2012, "Adventure", "Due Back Today at 12pm");
DVD cFurious7;
cFurious7.SetInfo("Furious 7", 2015, "Action", "One Left in Stock");
DVD cSavingPrivateRyan;
cSavingPrivateRyan.SetInfo("Saving Private Ryan", 1998, "Drama/War", "Discontinued");
DVD cGladiator;
cGladiator.SetInfo("Gladiator", 2000, "Action", "In Stock");
//Print out DVD Info
cInception.Print();
cFightClub.Print();
cPulpFiction.Print();
cTheDarkKnight.Print();
cAmericanHustle.Print();
cSilverLiningsPlaybook.Print();
cTheHungerGames.Print();
cFurious7.Print();
cSavingPrivateRyan.Print();
cGladiator.Print();
return 0; // fix return statement member
}
将程序创建为不同的翻译单元。
类声明必须采用 DVD.h 格式
#ifndef __DVD_H__
#define __DVD_H__
#include <iostream>
#include <string>
class DVD
{
public:
char m_strTitle[25];
int m_nYearOfRelease;
char m_strGenre[25];
char m_strRentalStatus[50];
void Print();
void SetInfo(const char *strTitle, int nYearOfRelease, const char *strGenre, const char *strRentalStatus);
};
#endif /* __DVD_H__ */
在DVD中定义DVD类方法.cpp
#include "DVD.h"
void DVD::Print()
{
using namespace std;
cout << "Title" << m_strTitle << "YearOfRelease" << m_nYearOfRelease << "Genre" << m_strGenre <<
"RentalStatus" << m_strRentalStatus << endl;
}
// Set the Info for 10 DVDs
// Also DVD class member function
void DVD::SetInfo(const char *strTitle, int nYearOfRelease, const char *strGenre, const char *strRentalStatus)
{
strncpy(m_strTitle, strTitle, 25);
m_nYearOfRelease = nYearOfRelease;
strncpy(m_strGenre, strGenre, 25);
strncpy(m_strRentalStatus, strRentalStatus, 50);
}
比在主要.cpp
#include <iostream>
#include <string>
#include "DVD.h"
int main()
{
//Declare 10 DVDs
DVD cInception;
cInception.SetInfo("Inception", 2010, "Action", "In stock");
DVD cFightClub;
cFightClub.SetInfo("Fight Club", 1999, "Action/Suspense", "Due back November12th");
DVD cPulpFiction;
cPulpFiction.SetInfo("Pulp Fiction", 1994, "Action", "In Stock");
DVD cTheDarkKnight;
cTheDarkKnight.SetInfo("The Dark Knight", 2008, "Drama", "In Stock");
DVD cAmericanHustle;
cAmericanHustle.SetInfo("American Hustle", 2013, "Drama", "Due back December1st");
DVD cSilverLiningsPlaybook;
cSilverLiningsPlaybook.SetInfo("Silver Linings Playbook", 2012, "Drama/Romance", "In Stock");
DVD cTheHungerGames;
cTheHungerGames.SetInfo("The Hunger Games", 2012, "Adventure", "Due Back Today at 12pm");
DVD cFurious7;
cFurious7.SetInfo("Furious 7", 2015, "Action", "One Left in Stock");
DVD cSavingPrivateRyan;
cSavingPrivateRyan.SetInfo("Saving Private Ryan", 1998, "Drama/War", "Discontinued");
DVD cGladiator;
cGladiator.SetInfo("Gladiator", 2000, "Action", "In Stock");
//Print out DVD Info
cInception.Print();
cFightClub.Print();
cPulpFiction.Print();
cTheDarkKnight.Print();
cAmericanHustle.Print();
cSilverLiningsPlaybook.Print();
cTheHungerGames.Print();
cFurious7.Print();
cSavingPrivateRyan.Print();
cGladiator.Print();
return 0; // fix return statement member
}
要使用文件，我们必须定义新的DVD类方法
// Defile new class method
void DVD::SetInfo(std::istream& stream)
{
// Read title
stream.getline(m_strTitle, 25);
// Read year of release
stream >> m_nYearOfRelease
// Read genre
stream.getline(m_strGenre, 25);
// Read rental status
stream.getline(m_strRentalStatus, 50);
}
所以在主要.cpp我们得到了这个
#include <iostream>
#include <string>
#include "DVD.h"
int main()
{
std::ifstream input_file("filename.txt");
DVD cInception;
cInception.SetInfo(input_file);
DVD cFightClub;
cFightClub.SetInfo(input_file);
DVD cPulpFiction;
cPulpFiction.SetInfo(input_file);
DVD cTheDarkKnight;
cTheDarkKnight.SetInfo(input_file);
DVD cAmericanHustle;
cAmericanHustle.SetInfo(input_file);
DVD cSilverLiningsPlaybook;
cSilverLiningsPlaybook.SetInfo(input_file);
DVD cTheHungerGames;
cTheHungerGames.SetInfo(input_file);
DVD cFurious7;
cFurious7.SetInfo(input_file);
DVD cSavingPrivateRyan;
cSavingPrivateRyan.SetInfo(input_file);
DVD cGladiator;
cGladiator.SetInfo(input_file);
//Print out DVD Info
cInception.Print();
cFightClub.Print();
cPulpFiction.Print();
cTheDarkKnight.Print();
cAmericanHustle.Print();
cSilverLiningsPlaybook.Print();
cTheHungerGames.Print();
cFurious7.Print();
cSavingPrivateRyan.Print();
cGladiator.Print();
return 0; // fix return statement member
}
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