Hello.
I didn't find any CoreFoundation mailing list, so I post my question
about CFStringEtCStringPtr() here in Cocoa mailing list.
My problem is that CFStringGetCStringPtr( ..., kCFStringEncodingUTF8)
doesn't convert a string passed through its first parameter and returns
0 on English system.
However, on Japanese system, it returns a pointer to converted string
correctly.
The first parameter points to a string which is a path in English. There
is no Japanese characters.
Because the 2nd parameter is one of 8 bit encoding, it didn't work
before on Japanese system, where it was called like :
CFStringGetCStringPtr( ..., CFStringGetSystemEncoding() )
The encoding method on a Japanese system is
kCFStringEncodingMacJapanese
<http://developer.apple.com/documentation/CoreFoundation/Reference/CFStringRef/Reference/reference.html#//apple_ref/doc/c_ref/kCFStringEncodingMacJapanese>
So, I forced the 2nd parameter to kCFStringEncodingUTF8 and thought that
it would work on English system also.
However, on an English system, of which system encoding is
kCFStringEncodingMacRoman
<http://developer.apple.com/documentation/CoreFoundation/Reference/CFStringRef/Reference/reference.html#//apple_ref/doc/c_ref/kCFStringEncodingMacRoman>
It doesn't convert its 1st parameter and returned 0.
So, I had to call another CFStringGetCStringPtr() with
CFStringGetSystemEncoding() as its 2nd parameter.
Is it a bug? Usually English encoding is the most trouble-free encoding
method which can be converted to UTF8. So, I expected that it would work
with kCFStringEncodingUTF8.
Or.. can anyone tell me why it doesn't work?
My whole source code which contains this fix is like
char *fullPath;
char outPath[512];;
Boolean conversionResult;
CFStringEncoding encodingMethod;
// This is for ensuring safer operation. When
CFStringGetCStringPtr() fails,
// it tries CFStringGetCString().
encodingMethod = CFStringGetSystemEncoding();
// 1st try for English system
fullPath = (char*)CFStringGetCStringPtr(mstr, encodingMethod);
if( fullPath == NULL )
{
// 2nd try for Japanese system
encodingMethod = kCFStringEncodingUTF8;
fullPath = (char*)CFStringGetCStringPtr(mstr, encodingMethod);
}
// for safer operation.
if( fullPath == NULL )
{
CFIndex length = CFStringGetLength(mstr);
fullPath = (char *)malloc( length + 1 );
conversionResult = CFStringGetCString(mstr, fullPath, length,
kCFStringEncodingUTF8 );
strcpy( outPath, fullPath );
free( fullPath );
}
else
strcpy( outPath, fullPath );
Thank you.
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