eVC++ String manipulation **RESOLVED**

[rabhen]

Hi there,
i am hoping someone can help me, i am writing a proggy in eVC++ the problem i have is i am trying to manipulate an array of character. i am setting the value of the array to NULL and then reading in the values from a file (17 characters at a time, though this causes problems and i find that 18 characters which includes the CR/LF characters on the end of the line) and placing the data from the file into the array.
then i want to append a few more characters on the end of this string. the problem i have, is that even though i initialise the array (as far as i know) the last few characters that appear in the array before it is re-initialised remain there and the characters i appent to the string get lost when i write the string to another file.
Below is a copy of the code i have:


void CNewForm::OnbtnComplete()
{int numread, numwritten;
char pList[21];
char NewVal[]="ZX";


(stream2 = fopen("\\temp\\sequence.txt","r+"));
//switch data between files. prove it can be done.
while (!feof(stream2))
{
pList[0]=NULL;
numread = fread( pList, sizeof( char ), 18 , stream2 );
strncat(pList,NewVal,2);
numwritten=fwrite(pList, sizeof(char), 21, stream);
}
fclose(stream);
fclose(stream2);


CDialog::OnOK();

}

note: Stream is opened earlier in the program as a w+ or a+ format depending on whether the file exists or not.

Please help me!

R

[jim mcnamara]

Try:

instead of this which is bad idea
pList[0]=NULL;
use this
memset(pList,0x00,sizeof(pList));

TO clobber the \n char:

for(char *buf=pList;*buf;buf++) {
         if(*buf=='\n') {
                      *buf=0x00;
                      break;
         }
}

Now you can stick more chars att the end of the array with strcat() and no have an embedded newline.

[rabhen]

thanks Jim,

i did manage to solve this issue a couple of hours back by using the

fprintf(stream, "%s%s\n",pList,NewVal);

seemed to give me the results i needed which is a good thing.

but i will try it out with your suggestions too..

R