(NSArray)writeToFile: issue

hi all,
have been struggling few days , need help. (nsarray) writetofile: fails. have written test code closely emulates code trying write. takes instance of class, places in nsarray, writes nsurl. measure, file @ given nsurl first read.
here code. (xcode(4.3.3), command line tool. file, "h.txt" words "this test" exists in folder called "testplist" on desktop.

code:

    #import <foundation/foundation.h>    @interface testclass : nsobject    @property(strong)nsstring * code;  @property(strong)nsstring * desc;        @end    @implementation testclass  @synthesize code, desc;        @end    int main(int argc, const char * argv[])  {        @autoreleasepool {                   nsstring * path = [nsstring stringwithstring:@"/users/m/desktop/testplist/h.txt"];                              testclass * 1 = [[testclass alloc]init];           [one setcode:@"123"];          [one setdesc:@"foo bar"];          nsarray *arrwithclass = [nsarray arraywithobject:one];                              nsurl * url = [nsurl fileurlwithpath:path];          nslog(@"url:%@",url);                              nsstring *filecontents = [nsstring stringwithcontentsofurl:url                                                            encoding:nsutf8stringencoding                                                               error:nil];                    nslog(@"file contents: %@", filecontents);                              bool success = [arrwithclass writetourl:url                                        atomically:yes];          if (success == yes)              nslog(@"suceeded");          else {              nslog(@"failed");          }                                }      return 0;  }      

output:
2012-07-15 15:35:33.138 testplistmaker[996:403] url:file://localhost/users/m/desktop/testplist/h.txt
2012-07-15 15:35:33.140 testplistmaker[996:403] file contents: test.
2012-07-15 15:35:33.140 testplistmaker[996:403] failed

appreciate input.

 

see reference doc nsarray's writetoxxx methods. types of objects (i.e. classes) supported? object 1 of supported types?

property list programming guide. read "what property list" heading under "about property lists".

 

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