Using nsdata to read and write binary files

Reference Article : Http://blog.codingmylife.com /? P = 85

# Import <Foundation/Foundation. h> int main (INT argc, const char * argv []) {ngutoreleasepool * Pool = [[ngutoreleasepool alloc] init]; nsstring * Path = @ "/users/billchen/desktop/f1.rtf"; nsstring * temp = @ "Hello Friend"; int I = 100; float F = 98.3333f; nsmutabledata * Writer = [[nsmutabledata alloc] init]; [Writer appenddata: [temp datausingencoding: nsutf8stringencoding]; [Writer appendbytes: & I length: sizeof (I)]; // & indicates the access address [Writer appendbytes: & F length: sizeof (f)]; [Writer writetofile: path atomically: Yes]; [Writer release]; int II; float ff; nsstring * ttemp; nsdata * reader = [nsdata datawithcontentsoffile: path]; ttemp = [[nsstring alloc] initwithdata: [READER subdatawithrange: nsmakerange (0, [temp length])] encoding: nsutf8stringencoding]; [READER getbytes: & II Range: nsmakerange ([temp length], sizeof (ii)]; [READER getbytes: & FF range: nsmakerange ([temp length] + sizeof (II), sizeof (ff)]; nslog (@ "string :%@ INT: % I float: % F ", ttemp, II, ff); [temp release]; [ttemp release]; [path release]; [pool drain]; return 0 ;}

• & Used to retrieve addresses and pointers
• Nsmakerange is used to generate the nsange

Returned results:

 
[Switching to process 13606 Thread 0x0] 13:24:04. 962 demo09 [13606: 903] string: Hello friend INT: 100 float: 98.333298