Already have a TXT file, specific format is as follows:
Number (11) the title author publishing date number
Then use the program for a number, (manually enter any number)
Use STRCMP than number and file all the number (find file whether there is a number of books), if the same will delete this whole line!!!!! This how to do ah, help!
Two kinds of thinking, a row to delete an existing file, or create a new file does not include the same number line, ask for help!!!!!!
Thank you very much!

CodePudding user response:

Read the file line by line, judgment

CodePudding user response:

All read
All write back does not skip deleting rows data

CodePudding user response:

Fyi:

//to sort the contents of the file 1 and heavy, as a result, save to file 2 
#include  
#include  
#include  
1024//# define MAXCHARS can deal with the biggest line width, including the end-of-line \ n and string tail \ 0 
Int MAXLINES=10000, MAXLINES2; 
Buf, char * * buf2; 
Int c, n, hh, I, L; 
The FILE * f; 
Char ln [MAXCHARS]; 
Int ignore_case=0; 
Int icompare (const void * arg1, const void * arg2) {
Return stricmp ((char *) arg1, arg2 (char *)); 
} 
Int the compare (const void * arg1, const void * arg2) {
Return STRCMP ((char *) arg1, arg2 (char *)); 
} 
Int main (int arg c, char * * argv) {
If (argc<3) {
Printf (" Unique line. Designed by [email protected]. The 2012-08-20 \ n "); 
Printf (" SRC Usage: % s. TXT uniqued. TXT [-] I \ n ", argv [0]). 
return 1; 
} 
If (argc> 3) ignore_case=1;//if there is a command line parameter 3, ignore case 
F=fopen (argv [1], the "r"); 
If (NULL==f) {
Printf (" Can not find the file % s! \ n ", argv [1]); 
return 1; 
} 
Buf=(char *) malloc (MAXLINES * MAXCHARS); 
If (NULL==buf) {
The fclose (f); 
Printf (" Can not malloc LINES * (% d % d CHARS)! The \ n ", MAXLINES, MAXCHARS); 
return 2; 
} 
N=0; 
Hh=0; 
i=0; 
While (1) {
If (NULL==the fgets (ln, MAXCHARS, f)) break;//
Hh++; 
L=strlen (ln) - 1; 
If (' \ n '!=ln [L]) {//long row behind ignore content 
Printf (" % s Line % d long (& gt; % d), spilth ignored. \ n ", argv [1], hh, MAXCHARS); 
While (1) {
C=fgetc (f); 
If (' \ n '==c | | EOF==c) break;//
} 
} 
While (1) {//removes white Spaces at the end of each line '\ n' and 
If (=='\ n' ln [L] | | '==ln [L]) {
Ln [L]=0; 
L -; 
If (L<0) break;//
} the else break;//
} 
If (L>=0) {
Strcpy (buf + I, ln); I +=MAXCHARS; 
n++; 
If (n>={MAXLINES) 
MAXLINES2=MAXLINES * 2; 
If (MAXLINES2==1280000) MAXLINES2=2500000; 
Buf2=(char *) realloc (buf, MAXLINES2 * MAXCHARS); 
If (NULL==buf2) {
Printf (" Can not malloc LINES * (% d % d CHARS)! The \ n ", MAXLINES2, MAXCHARS); 
Printf (" WARNING: Lines & gt; % d ignored. \ n ", MAXLINES); 
break;//
} 
Buf=buf2; 
MAXLINES=MAXLINES2; 
} 
} 
} 
The fclose (f); 
If (n> 1) {
If (ignore_case) tree (buf, n, MAXCHARS, icompare); 
The else tree (buf, n, MAXCHARS, compare); 
} 
F=fopen (argv [2], "w"); 
If (NULL==f) {
Free (buf); 
Printf (" Can not create the file % s! \ n ", argv [2]); 
return 2; 
} 
Fprintf (f "% s \ n", buf); 
If (n> 1) {
If (ignore_case) {
Hh=0; 
L=MAXCHARS; 
For (I=1; iBuf if (stricmp (const char *) + hh, buf (const char *) + L)) {
Fprintf (f "% s \ n", buf + L); 
} 
Hh=L; 
L +=MAXCHARS; 
} 
} else {
Hh=0; 
L=MAXCHARS; 
For (I=1; iBuf if (STRCMP (const char *) + hh, buf (const char *) + L)) {
Fprintf (f "% s \ n", buf + L); 
} 
Hh=L; 
L +=MAXCHARS; 
} 
} 
} 
The fclose (f); 
Free (buf); 
return 0; 
}