txt中的内容是4E6574776F726B205365637572697479
但是运行后的不是txt中的十六进制内容，
#include<iostream.h>
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
typedef unsigned char BYTE;
typedef unsigned int DWORD; /* 32 bit data type */
BYTE hex_value(BYTE value)
{
return ( ((value & 0x7f) >= 'A') ? (value - 7) : value) & 0x0f;
}
void compress(BYTE *dest, BYTE *source, DWORD pair)
{
while (pair)
{
pair--;
*dest = (hex_value(*source++) << 4);
*dest++ += hex_value(*source++);
}
}
int main()
{
FILE *fp;
unsigned char buffer[50];
unsigned char buf2[25];
if((fp=fopen("f1.txt","ab+"))==NULL)
{
cout<<"Cannot open the des_plain.txt"<<endl;
exit(0);
}
fread(buffer,32,1,fp);
compress(buf2,buffer,16);
for(int i=0;i<16;i++)
{
printf("%02x",buf2[i]);
}
fclose(fp);
return 0;
}
read_txt.cpp E:\VCtest