not sure how to save fscanf to file

[cujo401]

I have a script to read a file that has text on lines. The script is supposed to take the text and make them into space delimited and save the new text to a new file. I am able to only accomplish this with 1 line from the text file. I am new to c++, and have been using Herbert Schildt's C++ book. My other problem I am trying to solve is that the file I am using I wont know how many lines of text I will be converting. I have tried different loops none seem to work. here is a sample of what I've written if any one has any ideals, I would really appreciate the assistance. This is not a test for class or anything:

int main(void)
{
FILE *data;
FILE *TestFile;
// FILE *dataholder;

int i;
int j;
int k;
int x = 0;
char ch;
char str[4], str2[6], str3[6], str4[6];

if((data=fopen("file.txt", "r")) == NULL) {
printf("cannot open file.\n");
}

if((TestFile=fopen("testing.txt", "w")) ==NULL) {
printf("cannot open file.\n");
}

{
fscanf(data, "%[DAT]%[C]%d%[T]%d%[F]%d" , str, str2, &i, str3, &j, str4, &k);
cout << str<<" "<< str2<<i<<" "<< str3<<j<<" "<< str4<<k;
}

fclose(data);
fclose(TestFile);
return 0;
}

[kc0arf]

Hello,

I do not remember the exact syntax, but you need to loop until you reach the end of file. Otherwise your program just makes one iteration.

Christian

[frrossk]

I guess you want something like this:

...
while (!feof (data))
{
fscanf(data, "%s%s%d%s%d%s%d" , str, str2, &i, str3, &j, str4, &k);
fprintf (TestFile, "%s\t%s\t%d\t%s\t%d\t%s\t%d\n", str, str2, i, str3, j, str4, k);
}
...

Anyway, why are you mixing C and C++ instructions?

[cujo401]

I guess you want something like this:

...
while (!feof (data))
{
fscanf(data, "%s%s%d%s%d%s%d" , str, str2, &i, str3, &j, str4, &k);
fprintf (TestFile, "%s\t%s\t%d\t%s\t%d\t%s\t%d\n", str, str2, i, str3, j, str4, k);
}
...

Anyway, why are you mixing C and C++ instructions?

yeah, I actually rewrote it all in C++ here is the new script, in this script the file sample2.txt, I manually delimited with spaces but will not be able to do in the final process. Where sample2 is the file resolve will be used. Any ideals for this?

[frrossk]

Let's see if I get it right: you get a txt file, that contains data in a xxxyyyzzz format, and you want to write it in a file, in a format like xxx yyy zzz ?
If so, and if your data has some particular characteristics (I saw some ADT, Pxx and Dyyy in saple2.txt file), I would use some string functions (strtok, for example)

[1o0oBhP]

have you not tried the ANSI c++ string class (using <string>)?

Then you could add the space quite easily:

string str;

str += " "; // add the space, you will need to get the data into str first but ill leave that up to you!

[cujo401]

I am very new to c++ and don't know that structure (strtok), but to answer your question, that is what I am trying to accomplish (get a txt file, that contains data in a xxxyyyzzz format, and write it in a file, in a format like xxx yyy zzz). I also want the new file contents to be displayed. That format ADT Pxx Dyyy Annn, one other thing is that the variables of P D and A may change in length, will this make a difference in how I set the array length?

[frrossk]

one other thing is that the variables of P D and A may change in length

That's why I am talking about strtok :). It's a string manipulation function; it seems to me to be the simplest solution for what you want...
As long as your variables change in lenght, another solution can be this: read the fiel char by char; first 3 chars will be the ADT; write them to the output file; if a char = P, then here begin the 2nd variable; write every char to the output file; read chars until you read a D, here begin the 3rd variable, etc...

[cujo401]

ok thanks I try it