convert a utf16 to utf8 to use in fopen

[yogish]

Hi,
i am converting a ascii to utf16 using following code.


void asciitounicode(unsigned short *unicode,char *str)
{
char *tmpstr;
unsigned short *tmpunicode = unicode;
tmpstr = (char *)str;

while( *tmpstr!= '\0' )
{
*tmpunicode = (unsigned short)*tmpstr;
tmpstr++;
tmpunicode ++;
}
*tmpstr= '\0';
}

now a want to convert the utf16 to utf8 so that it can be used in fopen which supports utf8 string.

thanks.

 

[yogish]

i want to open a file in korean name using fopen.
so i am converting it to utf16 .Then i want to convert utf16 to utf8 so i can use it in fopen.
Do anyone have a sample code for this?

 

[Mikuro]

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.

 

[yogish]

const char * filepath = "/Volumes/TigerNew/abcd";
unsigned short *unifilepath;
asciitounicode(unifilepath,filepath);
NSString *nstr = [[NSString alloc] initWithBytes:unifilepath length:length encoding:NSUTF8StringEncoding];

fopen([nstr UTF8String],"r");

Will the above code work?

 

[Mikuro]

If asciitounicode() returns UTF16 data, you will need to pass UTF16 string encoding to initWithBytes. I'm not sure whether you should use NSUnicodeStringEncoding, NSUTF16BigEndianStringEncoding or NSUTF16LittleEndianStringEncoding, since I don't know exactly what asciitounicode() does.

Aside from that, yeah, that looks about right.

 

[yogish]

thank you for the information.
is there any api to convert a ascii string directly to utf16 or utf8?

 

[Mikuro]

UTF8 is backwards-compatible with ASCII. That means any ASCII string is valid as a UTF8 string, so there is no need to convert it.

You can also use those same NSString methods I mentioned to convert from just about any text encoding to just about any other. Check the NSString documentation for more info on the available string encodings.