C++从文件中读取对象的数组属性

• Z时代
• 2024-01-10
• 分类：问答

我有一个类，我想读对象到一个对象数组，但我有一个属性我的类（长数据[4];）的问题。我不知道我怎么读它。在阅读方法中，我想从文件中读取所有属性，并创建一个数据元素向量，并向构造函数添加从文件读取的向量。C++从文件中读取对象的数组属性

//Class: 
class Utilitati{ 
    const int id; 
    float PretUtilitati; 
    char * NumeUtilitati; 
    int Numarachizitii; 
    long data[4]; --This is the problem(I dont know how can i read it) 
//Constructor: 
    Utilitati(float PretUtilitati, char * NumeUtilitati, int Numarachizitii, long data[]) :id(3){ 
     this->PretUtilitati = PretUtilitati; 
     this->NumeUtilitati = new char[strlen(NumeUtilitati) + 1]; 
     strcpy(this->NumeUtilitati, NumeUtilitati); 
     this->Numarachizitii = Numarachizitii; 
     for (int i = 0; i < Numarachizitii; i++) 
      this->data[i] = data[i]; 
    } 
Data must be a vector from file. 
//Read Method: 
void citireFisier(char *numeFisier, Utilitati ** vectUtilitati) 
{ 
    FILE* file = fopen(numeFisier, "r+"); 
    if (!file) 
     cout << "\nEroare citire!" << endl; 
    else 
    { 
     int contor = 0; 
     float PretUtilitati; 
     char NumeUtilitati[20]; 
     int Numarachizitii; 
     long data[4]; 
     while (!feof(file)) 
     { 
      fscanf(file, "%f%s%i%l", &PretUtilitati, &NumeUtilitati, &Numarachizitii, &data); 
      Utilitati* NewUtilitati = new Utilitati(PretUtilitati, NumeUtilitati, Numarachizitii,data); 
      vectUtilitati[contor++] = NewUtilitati; 
     } 
    } 
} 

The file has the next format: 
    100 //float PretUtilitati 
    Gaze //char * NumeUtilitati; 
    3  // int Numarachizitii; 
    20171012 //long data[0]; 
    20151012 ////long data[2]; 
    20011023 ///long data[Numarachizitii]; 

回答：

fscanf(file, "%f%s%i%ld%ld%ld%ld", 
    &PretUtilitati, &NumeUtilitati, &Numarachizitii, 
    &data[0], &data[1], &data[2], &data[3]); 

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