On the usage of sscanf in C language _c language

Name:
sscanf ()-Reads data from a string that matches the specified format.

Copy Code code as follows:

Function Prototypes:
Int sscanf (String str, String fmt, mixed var1, mixed var2 ...);
int scanf (const char *format [, argument] ...);

Description:
SSCANF is similar to scanf and is used for input, except that the latter takes the screen (stdin) as the input source, with a fixed string as the input source.
The format can be one or more {%[*] [width] [{h | l | I64 | L}]type | ' ' | '/T ' | '/n ' | Non-% symbol}
Note:
1, * can also be used in the format, (that is,%*d and%*s) with an asterisk (*) indicates that skipping this data is not read. (that is, do not read this data into the parameter)
2. {A|b|c} indicates that A,b,c is selected, [d], that it can have D or not d.
3. Width represents the reading breadth.
4, {h | l | I64 | L}: The size of the parameter, usually H represents a single-byte Size,i 2 byte size,l represents 4 byte size (double exception), and L64 represents 8 byte size.
5, type: This is a lot of, is%s,%d and so on.
6, Special:%*[width] [{h | l | I64 | L}]type indicates that the condition is filtered out and the value is not written to the target parameter

Support for collection operations:
%[a-z] means to match any character in a to Z, greedy (as many matches as possible)
%[ab '] Match A, B, ' a member, greedy sex
%[^a] matches any character that is not a, greedy
Here is an example program

Copy Code code as follows:

/*****************************************************
* * NAME:SSCANF.C
* * Author:gzshun
* * version:1.0
* * DATE:2011-12
* * DESCRIPTION:SSCANF function
******************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void Sscanf_test (void);
static void Sscanf_test (void)
{
int ret;
Char *string;
int digit;
Char buf1[255];
Char buf2[255];
Char buf3[255];
Char buf4[255];
The simplest use of/*1.
string = "Beijing 123";
ret = sscanf (String, "%s%s%d", Buf1, Buf2, &digit);
printf ("1.string=%s\n", string);
printf ("1.ret=%d, buf1=%s, buf2=%s, digit=%d\n\n", ret, BUF1, buf2, digit);
/*
* * Execution Results:
**1.ret=3, Buf1=china, buf2=beijing, digit=123
* * You can see that the return value of the SSCANF is the number of parameters read
*/
/*2. Take a string of the specified length.
string = "123456789";
SSCANF (String, "%5s", BUF1);
printf ("2.string=%s\n", string);
printf ("2.buf1=%s\n\n", BUF1);
/*
* * Execution Results:
**2.buf1=12345
*/
/*3. The string to which the specified character is taken.
string = "123/456";
SSCANF (String, "%[^/]", BUF1);
printf ("3.string=%s\n", string);
printf ("3.buf1=%s\n\n", BUF1);
/*
* * Execution Results:
**3.buf1=123
*/
/*4. The string to which the specified character set is taken * *
string = "123abcABC";
SSCANF (String, "%[^a-z]", BUF1);
printf ("4.string=%s\n", string);
printf ("4.buf1=%s\n\n", BUF1);
/*
* * Execution Results:
**4.buf1=123abc
*/
/*5. Takes a string containing only the specified character set */
string = "0123abcABC";
SSCANF (String, "%[0-9]%[a-z]%[a-z]", Buf1, Buf2, BUF3);
printf ("5.string=%s\n", string);
printf ("5.buf1=%s, buf2=%s, buf3=%s\n\n", Buf1, Buf2, BUF3);
/*
* * Execution Results:
**5.buf1=123, BUF2=ABC, BUF3=ABC
*/
/*6. Gets the string in the middle of the specified character */
string = "ios<android>wp7";
SSCANF (String, "%*[^&LT;]&LT;%[^&GT;]", BUF1);
printf ("6.string=%s\n", string);
printf ("6.buf1=%s\n\n", BUF1);
/*
* * Execution Results:
**6.buf1=android
*/
/*7. Specifies the string to skip.
string = "Iosvsandroid";
SSCANF (String, "%[a-z]vs%[a-z]", BUF1, BUF2);
printf ("7.string=%s\n", string);
printf ("7.buf1=%s, buf2=%s\n\n", Buf1, BUF2);
/*
* * Execution Results:
**7.buf1=ios, Buf2=android
*/
/*8. Split a string separated by a character.
string = "android-iphone-wp7";
/*
* * string via '-', followed by the delimiter '-',
* * played a role in filtering, somewhat similar to the 7th
*/
SSCANF (String, "%[^-]-%[^-]-%[^-]", Buf1, Buf2, BUF3);
printf ("8.string=%s\n", string);
printf ("8.buf1=%s, buf2=%s, buf3=%s\n\n", Buf1, Buf2, BUF3);
/*
* * Execution Results:
**8.buf1=android, Buf2=iphone, buf3=wp7
*/
/*9. Extract Email Address * *
string = "email:beijing@sina.com.cn";
SSCANF (String, "%[^:]:%[^@]@%[^."). %s ", Buf1, Buf2, BUF3, BUF4);
printf ("9.string=%s\n", string);
printf ("9.buf1=%s, buf2=%s, buf3=%s, buf4=%s\n\n", Buf1, Buf2, BUF3, BUF4);
/*
* * Execution Results:
**9.buf1=email, Buf2=beijing, Buf3=sina, buf4=com.cn
*/
/*10. Filter out strings that you don't want to intercept or need--supplement,
* * After the% plus a * number, which represents filtering this string, does not read
*/
String = "Android iphone wp7";
SSCANF (String, "%s%*s%s", BUF1, BUF2);
printf ("10.string=%s\n", string);
printf ("10.buf1=%s, buf2=%s\n\n", Buf1, BUF2);
/*
* * Execution Results:
**10.android wp7
*/
}
int main (int argc, char **argv)
{
Sscanf_test ();

return 0;
}
/*
* * Test Program
* * Environment:
**linux ubuntu 2.6.32-24-generic-pae #39-ubuntu SMP Wed June 07:39:26 UTC i686 Gnu/linux
**GCC version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
**
gzshun@ubuntu:~/c/sscanf$ gcc Sscanf.c-o sscanf
gzshun@ubuntu:~/c/sscanf$./sscanf
1.string=china Beijing 123
1.ret=3, Buf1=china, buf2=beijing, digit=123
2.string=123456789
2.buf1=12345
3.string=123/456
3.buf1=123
4.string=123abcabc
4.buf1=123abc
5.string=0123abcabc
5.buf1=0123, BUF2=ABC, BUF3=ABC
6.string=ios<android>wp7
6.buf1=android
7.string=iosvsandroid
7.buf1=ios, Buf2=android
8.string=android-iphone-wp7
8.buf1=android, Buf2=iphone, buf3=wp7
9.string=email:beijing@sina.com.cn
9.buf1=email, Buf2=beijing, Buf3=sina, buf4=com.cn
10.string=android iphone wp7
10.buf1=android, buf2=wp7
*/