blocks|key|1782440|text|如果你使用的是Cocoa，那么使用NSString就相当简单了。只需使用-initWithBytes:length:encoding：(或者可能是-initWithCString:encoding:)加载UTF16数据，然后通过对结果调用UTF8String来获得UTF8版本。然后，只需使用新的UTF8字符串作为参数来调用fopen。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1782441|你绝对可以用UTF-8字符串来调用fopen，不管是哪种语言--不过在OSX上用C%2B%2B是无能为力的--对不起。|1782442|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If you're using Cocoa it's fairly easy with NSString. Just load the UTF16 data in using -initWithBytes:length:encoding: (or perhaps -initWithCString:encoding:) and then get a UTF8 version by calling UTF8String on the result. Then, just call fopen with your new UTF8 string as the param.

You can definitely call fopen with a UTF-8 string, regardless of language - can't help with C++ on OSX though - sorry.

blocks|key|1782539|text|Mac+OS+X中的POSIX+API可用于UTF-8字符串。为了将wchar_t字符串转换为UTF8，可以使用Mac中的CoreFoundation框架。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1782540|下面是一个类，它将从wchar_t字符串包装UTF-8生成的字符串。|1782541|class+Utf8
{
public:
++++Utf8(const+wchar_t*+wsz):+m_utf8(NULL)
++++{
++++++++//+OS+X+uses+32-bit+wchar
++++++++const+int+bytes+=+wcslen(wsz)+*+sizeof(wchar_t);
++++++++//+comp_bLittleEndian+is+in+the+lib+I+use+in+order+to+detect+PowerPC/Intel
++++++++CFStringEncoding+encoding+=+comp_bLittleEndian+?+kCFStringEncodingUTF32LE
+++++++++++++++++++++++++++++++++++++++++++++++++++++++:+kCFStringEncodingUTF32BE;
++++++++CFStringRef+str+=+CFStringCreateWithBytesNoCopy(NULL,+
+++++++++++++++++++++++++++++++++++++++++++++++++++++++(const+UInt8*)wsz,+bytes,+
++++++++++++++++++++++++++++++++++++++++++++++++++++++++encoding,+false,+
++++++++++++++++++++++++++++++++++++++++++++++++++++++++kCFAllocatorNull
++++++++++++++++++++++++++++++++++++++++++++++++++++++++);

++++++++const+int+bytesUtf8+=+CFStringGetMaximumSizeOfFileSystemRepresentation(str);
++++++++m_utf8+=+new+char[bytesUtf8];
++++++++CFStringGetFileSystemRepresentation(str,+m_utf8,+bytesUtf8);
++++++++CFRelease(str);
++++}+++

++++~Utf8()+
++++{+
++++++++if(+m_utf8+)
++++++++{
++++++++++++delete[]+m_utf8;
++++++++}
++++}

public:
++++operator+const+char*()+const+{+return+m_utf8;+}

private:
++++char*+m_utf8;
};|code-block|syntax|javascript|1782542|用法：|1782543|const+wchar_t+wsz+=+L"Here+is+some+Unicode+content:+éà€œæ";
const+Utf8+utf8+=+wsz;
FILE*+file+=+fopen(utf8,+"r");|1782544|这将适用于读取或写入文件。|1782545|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

POSIX API in Mac OS X are usable with UTF-8 strings. In order to convert a wchar_t string to UTF-8, it is possible to use the CoreFoundation framework from Mac OS X. 

Here is a class that will wrap an UTF-8 generated string from a wchar_t string.

<pre><code>class Utf8
{
public:
 Utf8(const wchar_t* wsz): m_utf8(NULL)
 {
 // OS X uses 32-bit wchar
 const int bytes = wcslen(wsz) * sizeof(wchar_t);
 // comp_bLittleEndian is in the lib I use in order to detect PowerPC/Intel
 CFStringEncoding encoding = comp_bLittleEndian ? kCFStringEncodingUTF32LE
 : kCFStringEncodingUTF32BE;
 CFStringRef str = CFStringCreateWithBytesNoCopy(NULL, 
 (const UInt8*)wsz, bytes, 
 encoding, false, 
 kCFAllocatorNull
 );

 const int bytesUtf8 = CFStringGetMaximumSizeOfFileSystemRepresentation(str);
 m_utf8 = new char[bytesUtf8];
 CFStringGetFileSystemRepresentation(str, m_utf8, bytesUtf8);
 CFRelease(str);
 } 

 ~Utf8() 
 { 
 if( m_utf8 )
 {
 delete[] m_utf8;
 }
 }

public:
 operator const char*() const { return m_utf8; }

private:
 char* m_utf8;
};
</code></pre>

Usage:

<pre><code>const wchar_t wsz = L"Here is some Unicode content: éà€œæ";
const Utf8 utf8 = wsz;
FILE* file = fopen(utf8, "r");
</code></pre>

This will work for reading or writing files.

I'm looking to the equivalent of Windows <a href="http://msdn.microsoft.com/fr-fr/library/yeby3zcb.aspx" rel="noreferrer"><code>_wfopen()</code></a> under Mac OS X. Any idea?

I need this in order to port a Windows library that uses <code>wchar*</code> for its File interface. As this is intended to be a cross-platform library, I am unable to rely on how the client application will get the file path and give it to the library.

_wfopen equivalent under Mac OS X

Windows

我正在寻找Mac下的视窗，你有什么想法吗？我需要它来移植一个使用wchar*作为File接口的Windows库。由于这是一个跨平台库，我无法依赖于客户端应用程序如何获取文件路径并将其提供给库。

问Mac下的_wfopen等效项
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