从midi文件读取字节时出现问题

Question

我想读取midi文件的单个字节，我写了一个简单的程序来尝试这样做：

ifstream file{"D:\Descargas\OutFile.midi" };

if (!file.is_open())
    cout << "Not open" << endl; // It passes this test

char c;
for (unsigned i = 0; i < 100; ++i) {
    file >> c;
    cout << c << endl; // Output is -52, but it must output 4D which is 77 in decimal
}

但正如我写的那样，输出效果并不好，我也不知道自己哪里出错了。

Answer 1

您需要将输出配置为以十六进制打印，并使用JSONArray people = new JSONArray(jsondata); int index = 0; for (int i = 0; i < people.length(); i++) { JSONObject tmpObj = people.getJSONObject(i); string name = tmpObj.getString("full_name"); if (name == "John") { index = i; break; } } JSONObject johnObjExample = people.getJSONObject(index); string johnName = johnObjExample.getString("full_name"); int id = johnObjExample.getInt("id"); String name = johnObjExample.getString("full_name"); String sex = johnObjExample.getString("sex"); String location = johnObjExample.getString("location"); 将每个数字填充到宽度0。此外，您需要将字符2强制转换为c，以便它不会以字母形式输出：

int

Answer 2

实际上必须转义\字符。