使用C语言实现以下功能

[zcp0317]

格式化文件的字段提取
输入:竖线分割的文件，格式：

字段1|字段2|流水号1(字段3)|字段4|···|字段26
字段1|字段2|流水号2(字段3)|字段4|···|字段26
·······

输出：冒号分割的文件，文件名随便，内容为输入文件的字段1，字段2，和字段7
格式：
字段1:字段2：字段3(输入文件的字段8)
字段1:字段2：字段3(输入文件的字段8)


我的思路是：
1.用fopen打开文件，
2.用fgets实现逐行读取，具体是，找到每行中字符‘|’的位置，然后两个‘|’之间的字符串写入到新的文件中，不知道这样可不可以？还有具体怎么实现啊？？？

[lirg8405]

可以，你先实现下，遇问题了再问

[qianfoyuan]

比如 :
char *pszStr = "I love you" | "ZhuJingmin" | "Saint Valentine's Day" | "1234";
char *pszTemp = NULL;

pszTemp = strtok(pszStr,"|");
while(NULL != pszTemp)
{
printf("%s\n",pszTemp);
pszTemp = strtok(NULL,"|");
}
即可完成字符串分割.
strtok 函数在 string 类中,所以你要加上 #include <string.h>

[zcp0317]

[Quote=引用 2 楼 cstdingjw 的回复:]

比如 :
char *pszStr = "I love you" | "ZhuJingmin" | "Saint Valentine's Day" | "1234";
char *pszTemp = NULL;

pszTemp = strtok(pszStr,"|");
while(NULL != pszTemp)
{
printf("%s\n",pszTemp);
……
[/Quote]


那我想提取其中的某一段该怎么办呢？

[AnYidan]

那我想提取其中的某一段该怎么办呢？

你必须知道其位置或内容！

[zcp0317]

[Quote=引用 4 楼 anyidan 的回复:]

那我想提取其中的某一段该怎么办呢？

你必须知道其位置或内容！
[/Quote]
比如我是想提取第2段和第5段的内容，我的想法是判断出1个“|”和第4个“|”的位置，然后再通过这个位置来提取。但现在我的问题是，我不知道知道了位置之后该怎么进行提取操作，不太懂哎，还有那个判断“|”位置用strstr()函数就可以么？

[「已注销」]

既然格式是固定的，直接如下
int 字段1,字段2,...字段26;
FILE * fpin=fopen(fnin,"rb");
fscanf(fpin,"%d|%d|%d|%d|···|%d",&字段1,&字段2...,&字段26);
按格式按行读入，输出时同理，用fprintf
打开要写入的文件，然后
fprintf(fpin,"%d:%d:%d",字段1,字段2,字段8);
。。结束

[赵4老师]

#include <stdio.h>
FILE *fi,*fo;
static char ln[1000];
static char f1[100];
static char f2[100];
static char f3[100];
static char f8[100];
void main {
 fi=fopen("in.txt","r");
 fo=fopen("out.txt","w");
 while (1) {
    if (NULL==fgets(ln,1000,fi)) break;
    if (4==sscanf(ln,"%[^|]|%[^|]|%[^|]|%*[^|]|%*[^|]|%*[^|]|%*[^|]|%[^|]|",f1,f2,f3,f8)) {
        fprintf(fo,"%s:%s:%s(%s)\n",f1,f2,f3,f8);
    } else break;
 }
 fclose(fo);
 fclose(fi);
}

[zcp0317]

if (4==sscanf(ln,"%[^|]|%[^|]|%[^|]|%*[^|]|%*[^|]|%*[^|]|%*[^|]|%[^|]|",f1,f2,f3,f8)) {
fprintf(fo,"%s:%s:%s(%s)\n",f1,f2,f3,f8);
} else break;

这一段是什么意思啊？？？

[赵4老师]

Format Specification Fields: scanf and wscanf Functions
A format specification has the following form:

%

• [width] [{h | l | I64 | L}]type
  
  
  To read strings not delimited by space characters, a set of characters in brackets ([ ]) can be substituted for the s (string) type character. The corresponding input field is read up to the first character that does not appear in the bracketed character set. If the first character in the set is a caret (^), the effect is reversed: The input field is read up to the first character that does appear in the rest of the character set.
  
  Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]. This is a common scanf function extension, but note that the ANSI standard does not require it.
  
  An asterisk (*) following the percent sign suppresses assignment of the next input field, which is interpreted as a field of the specified type. The field is scanned but not stored.
  
  

[赵4老师]

sscanf
Read formatted data from a string.

int sscanf( const char *buffer, const char *format [, argument ] ... );


Routine Required Header Compatibility
sscanf <stdio.h> ANSI, Win 95, Win NT


Return Value

This function returns the number of fields successfully converted and assigned; the return value does not include fields that were read but not assigned. A return value of 0 indicates that no fields were assigned. The return value is EOF for an error or if the end of the string is reached before the first conversion.

[dtmjg]

你先实现下，遇问题了再问