一个C++按行读取Unicode 文本文件的例子

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <cwctype>
#include <string>
#include <iostream>
using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
    if (argc == 2) {
        FILE *fp = NULL;
        errno_t err = _wfopen_s(&fp, argv[1], L"rb,ccs=Unicode");
        if (err != 0) {
            cout << "open file " << argv[1] << "failed. error code: " << err << endl;
        }

        wchar_t buf[2048] = {0}; // 假设每一行文本不超过2048字符
        size_t rdCount = fread(buf, 1, 2, fp);
        if (rdCount != 2) { fclose(fp); return 1; }

        if (buf[0] != 0xFF || buf[1] != 0xFE) {
            fseek(fp, 0, SEEK_SET); // 测试Unicode文件标志, 没有Unicode头，跳回文件头
        }

        while (!feof(fp)) {
            if (NULL != fgetws(buf, 2048, fp))
                wcout << buf << endl;    
        }

        fclose(fp);
    }
    return 0;
}