這些函數的使用都很簡單，總結一下，等下次使用一目瞭然。俗話說：好記性不如爛筆頭，記錄下來就是效率。
以下源代碼是本人測試的源文件，附帶講解註釋。
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/*****************************************************
** 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];
/*1.最簡單的用法*/
string = "china 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);
/*
**執行結果:
**1.ret=3, buf1=china, buf2=beijing, digit=123
**可以看出,sscanf的返回值是讀取的參數個數
*/
/*2.取指定長度的字符串*/
string = "123456789";
sscanf(string, "%5s", buf1);
printf("2.string=%s\n", string);
printf("2.buf1=%s\n\n", buf1);
/*
**執行結果:
**2.buf1=12345
*/
/*3.取到指定字符爲止的字符串*/
string = "123/456";
sscanf(string, "%[^/]", buf1);
printf("3.string=%s\n", string);
printf("3.buf1=%s\n\n", buf1);
/*
**執行結果:
**3.buf1=123
*/
/*4.取到指定字符集爲止的字符串*/
string = "123abcABC";
sscanf(string, "%[^A-Z]", buf1);
printf("4.string=%s\n", string);
printf("4.buf1=%s\n\n", buf1);
/*
**執行結果:
**4.buf1=123abc
*/
/*5.取僅包含指定字符集的字符串*/
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);
/*
**執行結果:
**5.buf1=123, buf2=abc, buf3=ABC
*/
/*6.獲取指定字符中間的字符串*/
string = "ios<android>wp7";
sscanf(string, "%*[^<]<%[^>]", buf1);
printf("6.string=%s\n", string);
printf("6.buf1=%s\n\n", buf1);
/*
**執行結果:
**6.buf1=android
*/
/*7.指定要跳過的字符串*/
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);
/*
**執行結果:
**7.buf1=ios, buf2=android
*/
/*8.分割以某字符隔開的字符串*/
string = "android-iphone-wp7";
/*
**字符串取道'-'爲止,後面還需要跟着分隔符'-',
**起到過濾作用,有點類似於第7點
*/
sscanf(string, "%[^-]-%[^-]-%[^-]", buf1, buf2, buf3);
printf("8.string=%s\n", string);
printf("8.buf1=%s, buf2=%s, buf3=%s\n\n", buf1, buf2, buf3);
/*
**執行結果:
**8.buf1=android, buf2=iphone, buf3=wp7
*/
/*9.提取郵箱地址*/
string = "Email:[email protected]";
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);
/*
**執行結果:
**9.buf1=Email, buf2=beijing, buf3=sina, buf4=com.cn
*/
/*10.過濾掉不想截取或不需要的字符串--補充,
**在%號後面加一*號,代表過濾這個字符串,不讀取
*/
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);
/*
**執行結果:
**10.android wp7
*/
}
int main(int argc, char **argv)
{
sscanf_test();
return 0;
}
/*
**測試程序
**環境:
**Linux ubuntu 2.6.32-24-generic-pae #39-Ubuntu SMP Wed Jul 28 07:39:26 UTC 2010 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:[email protected]
9.buf1=Email, buf2=beijing, buf3=sina, buf4=com.cn
10.string=android iphone wp7
10.buf1=android, buf2=wp7
*/
原文博客地址：http://blog.csdn.net/gzshun/article/details/7081736