c++逐字节读取png文件莫名提前读到文件尾

我想写个控制台程序，逐字节的读取png文件的内容，然后以16进制的形式输出出来，看看png文件里面写了些什么。

但是，总是读完前5个字节，就读到文件尾了。

我自己搞不懂为什么，身边也没有人可以问。希望有热心的好哥哥帮忙解答一下。谢谢~ q(≧▽≦q)

 

下面是我的代码

#include <iostream>
#include<fstream>
#include<string>
using namespace std;
ifstream inFile1;
int main()
{
    cout << "Please Enter the File's Name which You Want to Open.\n";
    string fileName1;
    cin >> fileName1;
    inFile1.open(fileName1);

    char ch;
    int counter = 0;
    int temp = 0;
    inFile1.read(&ch, 1);
    while (!inFile1.eof())
    {
        temp = ch & 0x000000ff;
        cout <<hex<<temp<< "\t";
        counter++;
        if (counter == 5)
        {
            counter = 0;
            cout << endl;
        }
        inFile1.read(&ch, 1);
    }

    if (inFile1.eof())
        cout << "End of file reached.\n";
    else if (inFile1.fail())
        cout << "Input terminated by data mismatch.\n";
    else
        cout << "Input terminated for unknown reason.\n";
    inFile1.close();

    return 0;
}

我这里将fileName1变量的类型改为字符数组后，测试是正常运行的。

修改如下：

参考链接：


#include <iostream>
#include<fstream>
#include<string>
using namespace std;
ifstream inFile1;
int main()
{
    cout << "Please Enter the File's Name which You Want to Open.\n";
//    string fileName1;
    char fileName1[200];
    cin >> fileName1;
    // https://blog.csdn.net/sinat_36219858/article/details/80369255
    inFile1.open(fileName1);

    char ch;
    int counter = 0;
    int temp = 0;
    inFile1.read(&ch, 1);
    while (!inFile1.eof())
    {
        temp = ch & 0x000000ff;
        cout <<hex<<temp<< "\t";
        counter++;
        if (counter == 5)
        {
            counter = 0;
            cout << endl;
        }
        inFile1.read(&ch, 1);
    }

    if (inFile1.eof())
        cout << "End of file reached.\n";
    else if (inFile1.fail())
        cout << "Input terminated by data mismatch.\n";
    else
        cout << "Input terminated for unknown reason.\n";
    inFile1.close();

    return 0;
}

img