c++ - 按字节读取文件

Question

我有一个简单的程序:

#include <cstring>
#include <fstream>

using namespace std;

int main(int argc, char **argv)
{
    cout << "Creating test.txt file..." << endl;

    // Writing to file
    fstream fWrite;
    fWrite.open("./_test_data/test.txt", fstream::out | fstream::trunc);
    if (fWrite.fail()) {
        cout << "Creating test.txt file failed!" << endl;
        fWrite.close();
    } else {
        fWrite << (char) 0x09 << (char) 0x0A << (char) 0x0B;
        fWrite << (char) 0x0C << (char) 0x0D << (char) 0x0E;
        fWrite << flush;

        fWrite.close();
        cout << "test.txt file successfully created." << endl;
    }

    // Reading created file
    cout << "Reading test.txt file..." << endl;
    fstream fRead;
    fRead.open("./_test_data/test.txt", fstream::in);
    if (fRead.fail()) {
        fRead.close();
    } else {
        char character;

        while (true) {
            fRead >> character;

            if (fRead.eof()) {
                cout << (int)character << endl;
                cout << "EOF detected!" << endl;
                break;
            }

            cout << (int)character << endl;
        }
        fRead.close();
    }

    return 0;
}

它应该只按照 09 0A 0B 0C 0D 0E 的顺序写入字节，这样做没问题(通过 hexdump 检查)，但是当读取同一个文件时，它读取第一个字节为 0E (= 十进制的 14)然后是 EOF...

Creating test.txt file...
test.txt file successfully created.
Reading test.txt file...
14
14
EOF detected!

为什么？

Answer 1

使用 fRead.read(&character,1)而不是 fRead >> character .

但您也可以删除 cout << (int)character << endl;在 if 语句中。