C ++ WriteFile Unicode字符 [英] c++ WriteFile unicode characters
问题描述
我正在尝试使用WriteFile函数将wstring写入UTF-8文件。
我希望文件包含这些字符ÑÁ,但我得到这个 ...。
I'm trying to write a wstring into a UTF-8 file using WriteFile function. I want the file to have these characters "ÑÁ" but I'm getting this "�".
这里是代码
#include <iostream>
#include <cstdlib>
#include <sstream>
#include <string>
#include <fstream>
#include <windows.h>
#include <wchar.h>
#include <stdio.h>
#include <winbase.h>
using namespace std;
const char filepath [] = "unicode.txt";
int main ()
{
wstring str;
str.append(L"ÑÁ");
wchar_t* wfilepath;
// Create a file to work with Unicode and UTF-8
ofstream fs;
fs.open(filepath, ios::out|ios::binary);
unsigned char smarker[3];
smarker[0] = 0xEF;
smarker[1] = 0xBB;
smarker[2] = 0xBF;
fs << smarker;
fs.close();
//Open and write in the file with windows functions
mbstowcs(wfilepath, filepath, strlen(filepath));
HANDLE hfile;
hfile = CreateFileW(TEXT(wfilepath), GENERIC_WRITE, 0, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
wstringbuf strBuf (str, ios_base::out|ios::app);
DWORD bytesWritten;
DWORD dwBytesToWrite = (DWORD) strBuf.in_avail();
WriteFile(hfile, &strBuf, dwBytesToWrite, &bytesWritten, NULL);
CloseHandle(hfile);
}
我使用以下命令行在cygwin上进行编译:
g ++ -std = c ++ 11 -g Windows.C -o Windows
I compile it on cygwin using this command line:
g++ -std=c++11 -g Windows.C -o Windows
推荐答案
您需要先将UTF-16数据转换为UTF-8,然后再将其写入文件。
You need to convert the UTF-16 data to UTF-8 before writing it to the file.
并且无需使用以下命令创建文件 std :: ofstream
,将其关闭,然后使用 CreateFileW()
重新打开。只需打开文件一次,然后写所有您需要的文件即可。
And there is no need to create the file with std::ofstream
, close it, and re-open it with CreateFileW()
. Just open the file once and write everything you need.
尝试一下:
#include <iostream>
#include <cstdlib>
#include <string>
//#include <codecvt>
//#include <locale>
#include <windows.h>
#include <wchar.h>
#include <stdio.h>
using namespace std;
LPCWSTR filepath = L"unicode.txt";
string to_utf8(const wstring &s)
{
/*
wstring_convert<codecvt_utf8_utf16<wchar_t>> utf16conv;
return utf16conv.to_bytes(s);
*/
string utf8;
int len = WideCharToMultiByte(CP_UTF8, 0, s.c_str(), s.length(), NULL, 0, NULL, NULL);
if (len > 0)
{
utf8.resize(len);
WideCharToMultiByte(CP_UTF8, 0, s.c_str(), s.length(), &utf8[0], len, NULL, NULL);
}
return utf8;
}
int main ()
{
wstring str = L"ÑÁ";
// Create a UTF-8 file and write in it using Windows functions
HANDLE hfile = CreateFileW(filepath, GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hfile != INVALID_HANDLE_VALUE)
{
unsigned char smarker[3];
DWORD bytesWritten;
smarker[0] = 0xEF;
smarker[1] = 0xBB;
smarker[2] = 0xBF;
WriteFile(hfile, smarker, 3, &bytesWritten, NULL);
string strBuf = to_utf8(str);
WriteFile(hfile, strBuf.c_str(), strBuf.size(), &bytesWritten, NULL);
CloseHandle(hfile);
}
return 0;
}
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