我如何在C++工作中获得此计数器功能

Question

我正在尝试设置一个计数器函数，该函数将计算输入文件中的项目数并在消息框中显示答案。我想我很接近，但我似乎无法让它正常工作。这是我的结构。

#pragma region Global Declarations
#include <iostream>
#include <fstream>
#include <iomanip>
struct PetData
{
    int IdNumber;
    char PetType[25];
    double PetPrice;
    //Count and display the number of items in the linked list
    int CountItems;
    PetData * Link;
};
PetData *Headpointer = NULL;
ifstream DataFile;
ofstream FileOut;
//Create a report listing the records
//that currently comprise the linked list
void ListRecords ( char * );
void InsertItem ( int, char[],double, PetData* );
void OutputItem ( PetData*);

#pragma endregion

这是我对柜台的准备

 OutputItem ( Headpointer );
 //FinalMessage->Visible=true;
 Headpointer->ListRecords ( OutPutFileName );
 MessageBox::Show ("Listed Printed To Output File n"
             + Headpointer->CountItems + " Items Were Printed",
             "Report Created", MessageBoxButtons::OK,
             MessageBoxIcon::Information);
         //cleanup
 DataFile.close( );
 FileOut.close( );
 delete CurrentRecordPointer;
 Headpointer = NULL;

感谢您提供的任何帮助。 谢谢

Answer 1

也许你需要类似的东西？

#pragma region Global Declarations

#include <Windows.h>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <sstream>
class LinkedList
{
public:
    struct PetData
    {
        int IdNumber;
        char PetType[25];
        double PetPrice;
        //Count and display the number of items in the linked list        
        PetData * Link;
    };
private:
    PetData *Headpointer;
    ifstream DataFile;
    ofstream FileOut;
    void DeleteItems();
public:
    LinkedList():Headpointer(NULL)
    {        
        OutputItem ( Headpointer );
    };
    ~LinkedList()
    {
        DataFile.close( );
        FileOut.close( );
        DeleteItems();
    }
    //Create a report listing the records
    //that currently comprise the linked list
    void ListRecords (const char * );
    void InsertItem ( int, char[],double, PetData* );    
    void OutputItem ( PetData*);
    int CountItems();    
};

#pragma endregion

        const char * OutPutFileName="out.file";
        LinkedList * list = new LinkedList();        
         //FinalMessage->Visible=true;
         list->ListRecords ( OutPutFileName );
         wstringstream ss;
         ss<<"Listed Printed To Output File n" << list->CountItems() << " Items Were Printed";
         MessageBox(NULL, ss.str().c_str(), TEXT("Report Created"), MB_OK|MB_ICONINFORMATION);
         //cleanup

Answer 2

你有这个：

Headpointer->ListRecords ( OutPutFileName );

这等同于

(*Headpointer).listRecords(OutputFileName);

但 *Headpointer 是一个没有 listRecords 函数的 PetData。该函数在结构外部声明。