C++ ifstream在從文本文件中讀取數據時追加垃圾數據

Question

char* readFromFile(char* location) 
{ 
    int total = 0; 
    ifstream ifile = ifstream(location); 
    ifile.seekg(0, ifile.end); 
    total = ifile.tellg(); 

    cout << "Total count" << total << endl; 
    char* file = new char[total+1]; 

    ifile.seekg(0, ifile.beg); 

    ifile.read(file, total+1); 

    cout <<"File output" << endl<< file << "Output end"<<endl; 

    return file; 
} 

這裏是打印文件數據，但它也附加了一些垃圾數值。我應該如何解決它？

Answer 1

read只是讀取了一定數量的字節，它並沒有終止該序列。雖然cout期望一個空終止的序列，因此它會繼續打印位於數組之後的隨機內存，直到它運行到0.因此，您需要分配一個額外的字符，然後用空字符填充它。

char* readFromFile(char* location) 
{ 
    int total = 0; 
    ifstream ifile = ifstream(location); 
    ifile.seekg(0, ifile.end); 
    total = ifile.tellg(); 

    cout << "Total count" << total << endl; 
    char* file = new char[total+1]; 

    ifile.seekg(0, ifile.beg); 

    ifile.read(file, total); //don't need the +1 here 

    file[total] = '\0'; //Add this 

    cout <<"File output" << endl<< file << "Output end"<<endl; 

    return file; 
}