ifstream总是将"ELF"返回给object

Question

我编写了以下方法来检查我的程序是否与文件IO一起正常工作,但它绝对不起作用.我从inFile得到的只是"ELF",谁能告诉我为什么？我的对象与其他类型的istreams完美搭配.

void testFiles(int ct, char ** args)
{
    if(ct<2){
        cout<<"Invalid number of arguments. Must be two files, one for input, one for output."<<endl;
        return;
    }
    ifstream inFile;
    inFile.open(args[0]);
    Tree<Word,int> x;
    Word *key;
    Word *val;
    cout<<"Tree extracted from file: "<<endl;
    while(inFile.good()&&inFile.is_open()){
        key = new Word();
        val = new Word();
        inFile>>*key;
        inFile>>*val;
        if(!inFile.good()){
            cout<<"Error: incomplete key-value pair:"<<key->getStr()<<endl;
            break;
        }
        cout<<key->getStr()<<" "<<val->getStr()<<endl;
        x[*key] = val->asInt();
        delete key;
        delete val;
    }
    inFile.close();
    ofstream outFile;
    outFile.open(args[1]);
    cout<<"Tree as read from file:"<<endl<<x;
    outFile<<x;
    outFile.close();
}

Answer 1

args [0] 不是你程序的第一个参数.它是可执行文件本身的名称.

发生的事情是你打开自己的可执行文件,而不是命令行中指定的文件,并且由于你的程序是linux二进制文件,你正在读取ELF二进制文件开头的魔术字符串,这是" ELF".

要修复错误,请将args [0]更改为args [1].