Problem with memcpy

Applications Programming
1

Hi ,

I am having records in a file like

00412772784705041008FRUITFUL STRWBRRY
00412772784703041008FRUITFUL STRWBERE
00000570632801448078 X

i have declared a structure like

typedef struct \{
 char Uname[16];
 char Pname[4];
 char Sname[17];

} person;

I am using reading the file one line by line and i am doing memcpy to 
store the line into the structure

memset\(person,0,sizeof\(person\)\);
memcpy\(person,line1,37\) -- here line1 has the line from the file the above three lines i mentioned

The problem is that ,for 1 and 2 line i am getting the correct result , For third  line it is storing
withthe space as well. 

my Sname for line 3 contains 

"             X   "

but it should be as 

"X                "

i used trim function on sname like trim\(person.Sname\). If i do this is is storing as a single character
as "X" ..

 But i need the  the 17 character string  it should be as

"X "

any way can we do this ??..

Please help ..

Thanks in Advance,
Arun
2

What you are doing is correcting the data, not reading it. You memcpy is correct.
If you must change the data, try this

if (person.Sname[0]==' ')
{
    char tmp[18]={0x0};
    char *p=person.Sname;
    while(*p==' ') p++;
    sprintf(tmp, "%-17s", p);
    memcpy(person.Sname, 17, tmp);
}
3

Thanks jim ..

i tried this , it is showing access vilolation error at the memcpy line . I tried with debugging . I can able to find the error only at memcpy line . Can you please help me to correct this.

It is compiling , but the error is comming at runtime

Thanks,
Arun

4

Hi,

actualy Jimi made an error :D;) in his code the sintax from memcpy is like
this

void * memcpy ( void * destination, const void * source, size_t num );

i think you notice the diference.

try to write memcpy(person.Sname, tmp, 17 );

5

Are you trying to remove leading blanks and then adding them to the end of the array of characters stored in the struct person. :confused:
Post the source code you are using to accomplish this.