wchar_t to NSString NSString to wchar_t

wchar_t在mac intel下就是UTF-32LE，所以

wchar_t wchar[] = L"汉字";
NSString *str = [[NSString alloc] initWithBytes:wchar length:
wcslen(wchar) encoding:NSUTF32LittleEndianStringEncoding];

在iPhone中wchar_t 是32位的，所以转化的时候需要用NSUTF32StringEncoding。

下面就是转化的代码：

NSString *string = @"中国";

wchar_t *str = (wchar_t *)[string cStringUsingEncoding:NSUTF32StringEncoding];

eg.

    NSString *str = [[NSString alloc] initWithBytes:token->token().c_str() length:wcslen(token->token().c_str())*4 encoding:NSUTF32LittleEndianStringEncoding];

    NSLog(@"str = %@",str);

------------------------------------------------------------------------------------------------------------------------

wchar_t * token = (wchar_t *)[ccTokencStringUsingEncoding:NSUTF32StringEncoding];