c语言转换字节码,c语言 int与byte[]互相转换

gdb调试

root@ubuntu:/media/mtk6795/alps/sunwave_pub# gcc -g test.c

root@ubuntu:/media/mtk6795/alps/sunwave_pub# gdb ./a.out

GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04

Copyright (C) 2012 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-linux-gnu".

For bug reporting instructions, please see:

...

Reading symbols from /media/mtk6795/alps/sunwave_pub/a.out...done.

(gdb) start

Temporary breakpoint 1 at 0x40054c: file test.c, line 6.

Starting program: /media/mtk6795/alps/sunwave_pub/a.out

Temporary breakpoint 1, main () at test.c:6

6int a =257;

(gdb) n

7int a0=0,a1=0;

(gdb)

8unsigned char * pBuf = NULL ;

(gdb)

9int b=0;

(gdb)

10pBuf = (unsigned char*) malloc(72*128*sizeof(unsigned char));

(gdb)

13 pBuf[0] =(unsigned char)(a & 0xff);

(gdb)

14pBuf[1] = (unsigned char)((a & 0xff00) >> 8);

(gdb)

16 a0 = a%256;

(gdb)

17 a1 = a/256;

(gdb)

19printf("bruce int2byte ==>> pBuf[0]=%d,pBuf[1]=%dn",pBuf[0],pBuf[1]);

(gdb)

bruce int2byte ==>> pBuf[0]=1,pBuf[1]=1

20printf("bruce int2byte ==>> a0=%d,a1=%dn",a0,a1);

(gdb)

bruce int2byte ==>> a0=1,a1=1

23b =(int)(( pBuf[0] & 0xff )|((pBuf[1] & 0xff)<<8));

(gdb)

24printf("bruce byte2int ==>> b=%dn",b);

(gdb)

bruce byte2int ==>> b=257

27return 0;

(gdb)

28}

(gdb)

c语言 int与byte[]互相转换

#include

#include

#include

#include

int main(){

int a =257;

int a0=0,a1=0;

unsigned char * pBuf = NULL ;

int b=0;

pBuf = (unsigned char*) malloc(72*128*sizeof(unsigned char));

//int2byte

pBuf[0] =(unsigned char)(a & 0xff);

pBuf[1] = (unsigned char)((a & 0xff00) >> 8);

a0 = a%256;

a1 = a/256;

printf("bruce int2byte ==>> pBuf[0]=%d,pBuf[1]=%dn",pBuf[0],pBuf[1]);

printf("bruce int2byte ==>> a0=%d,a1=%dn",a0,a1);

//byte2int

b =(int)(( pBuf[0] & 0xff )|((pBuf[1] & 0xff)<<8));

printf("bruce byte2int ==>> b=%dn",b);

return 0;

}