i am trying to read from a binary file.
hexcode of the binary:
ff d8 ff d2 44 54 39 02 23 03 05
half the times i get this as teh out put:Code:char buf[20]; fread(buffer,sizeof(char),4,in); buf[0]=buf[0]&0xff; buf[1]=buf[1]&0xff; printf(" %x %x",buf[0],buf[1]);
ff d8
rest of teh times :
ffffffff ffffffd8
compiler i am using is dmc;
i want the output to be consistently ff d8 all of the times.what do i need to do for that?
Code:printf("ff d8");
Quzah.
Hope is the first step on the road to disappointment.
ok thats one way to do it.HIGHLY COMMENDABLE.
what if i dont know what the first two bits r and still want the output to be consistent?**
(**dont tell me i need to try out multiple times and then finally when i do have an idea of what the first 2 bits r i use printf( firstbit,secondbit) for consistency.)
try something along these lines:
%x makes printf expect an int but you send a char....so you sent 3 bytes less than expected.Code:char buf[20]; fread(buffer,sizeof(char),4,in); int num1=buf[0]&0xff; int num2=buf[1]&0xff; printf(" %x %x",num1,num2);
Some speculations: because printf wants an int but gets a char, it will access some memory that hasnt been initiallized or is even used by you.
STL Util a small headers-only library with various utility functions. Mainly for fun but feedback is welcome.
i think that should help.
thank you.
Declare buf[] as unsigned char instead?
