以二进制模式将utf16写入文件

本文介绍了以二进制模式将utf16写入文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想用二进制模式写入一个wstring文件与streamstream，但我认为我做错了。这是我试过的：

ofstream outFile（test.txt，std :: ios :: out | std :: ios :: binary）; wstring hello = Lhello; outFile.write（（char *）hello.c_str（），hello.length（）* sizeof（wchar_t））; outFile.close（）;

在例如Firefox中打开test.txt，编码设置为UTF16，它将显示为：

h e l l o

有人能告诉我为什么会发生这种情况吗？

在十六进制编辑器中打开文件我得到： / p>

FF FE 68 00 00 00 65 00 00 00 6C 00 00 00 6C 00 00 00 6F 00 00 00

看起来像是因为某些原因，每个字符之间有两个额外的字节？

解决方案

我怀疑sizeof（wchar_t）是4在你的环境 - 即它写出UTF-32 / UCS-4而不是UTF-16。这确实是十六进制转码的样子。

这很容易测试（只打印出sizeof（wchar_t）），但我很确定它是怎么回事。 / p>

要从UTF-32 wstring到UTF-16，您需要应用正确的编码，因为代理对会发挥作用。

I'm trying to write a wstring to file with ofstream in binary mode, but I think I'm doing something wrong. This is what I've tried:

ofstream outFile("test.txt", std::ios::out | std::ios::binary); wstring hello = L"hello"; outFile.write((char *) hello.c_str(), hello.length() * sizeof(wchar_t)); outFile.close();

Opening test.txt in for example Firefox with encoding set to UTF16 it will show as:

h�e�l�l�o�

Could anyone tell me why this happens?

EDIT:

Opening the file in a hex editor I get:

FF FE 68 00 00 00 65 00 00 00 6C 00 00 00 6C 00 00 00 6F 00 00 00

Looks like I get two extra bytes in between every character for some reason?

解决方案

I suspect that sizeof(wchar_t) is 4 in your environment - i.e. it's writing out UTF-32/UCS-4 instead of UTF-16. That's certainly what the hex dump looks like.

That's easy enough to test (just print out sizeof(wchar_t)) but I'm pretty sure it's what's going on.

To go from a UTF-32 wstring to UTF-16 you'll need to apply a proper encoding, as surrogate pairs come into play.