ifstream读取二进制文件

使用ifstream读取二进制文件的步骤如下：
1. 包含头文件：`#include <fstream>`
2. 创建流对象：`ifstream ifs;`
3. 打开文件：`ifs.open("filename", ios::in | ios::binary);`
4. 判断文件是否打开成功：`ifs.is_open();`
5. 读取文件：定义一个字符数组作为缓冲区，然后使用`ifs.read(buffer, len);`方法来读取文件内容。
6. 处理读取到的内容，例如输出到控制台或进行其他操作。
7. 关闭文件：`ifs.close();`

下面是一个示例代码：

#include <iostream>
#include <fstream>

int main() {
    std::ifstream ifs("filename", std::ios::in | std::ios::binary);
    if (!ifs.is_open()) {
        std::cout << "文件打开失败" << std::endl;
        return 0;
    }

    char buffer<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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