可能重复:
Reading from text file until EOF repeats last line
c++ EOF running one too many times?为什么C++ ifstream的读取与重复记录
我写一个简单的C++代码读取和写入二进制文件,但我发现ifstream会两次读取记录。我不知道这是如何发生,但我尝试编译在Windows和Linux与mingw32的代码,相同的情况下
ofstream outfile;
int data[5];
outfile.open("abc.out", ios::out | ios::trunc | ios::binary);
data[0] = data[1] = 1;
data[2] = data[3] = 2;
data[4] = -1;
cout << "ORIGINAL DATA:" << data[0] << " " << data[1] << " " << data[2] << " " << data[3] << " " << data[4] << endl << endl;
outfile.write((char *)&data[0], 5*sizeof(int));
outfile.close();
ifstream infile;
infile.open("abc.out", ios::in | ios::binary);
data[0] = data[1] = data[2] = data[3] = data[4] = 0;
while (!infile.eof())
{
infile.read((char *)&data[0], 5*sizeof(int));
cout << data[0] << " " << data[1] << " " << data[2] << " " << data[3] << " " << data[4] << endl;
}
这里是输出
原始数据:1 1 2 2 -1
1 1 2 2 -1
1 1 2 2 -1
'infile.eof()'只*后返回true *无法读取,因此该循环运行一次太多。 – 2012-04-08 07:06:02
谢谢博佩尔松,但我还是不知道如何解决这个问题。读“从文本文件中读取直到EOF重复最后一行”,我尝试下面的代码 而(真){ ... 如果(infile.eof())破; } 但仍然无法正常工作 – user1285419 2012-04-08 07:09:29
@user - 您可以测试EOF,或检查read'的'的返回值,决定写信给COUT之前(暗示,暗示!)。 – 2012-04-08 07:13:50