如何打开文件&用c解析它？ [英] how to open file & parse it in c?

问题描述

我正在尝试打开此文件（final.txt）&阅读内容



？c0001

？f260

？L

D11

H30

R0000

C0040

1X1100000100010B300300003003

181100202900027部分否

181100202900097 [PRTNUM]

1e5504002400030B

1X1100002300010L300003

191100202000030数量

191100202000080 [QUANTY]
1e5504001500040B

1X1100001400010L300003

1X1100001400150L003090

191100202000170P.O.No

191100202000220 [PONUMB]

1e5504001500180B

191100201200030供应商

1e3304000700030B

1X1100000600010L300003

181100200300030Serial

181100200300090 [序列号]

171100300900190Rev

171100300300190 [REV]

171100300900240Units

171100300300240 [UNITS]

1X1100000100180L003130

Q0001

E





来自我只想阅读[ PRTNUM]，[QUANTY]，[PONUMB]，[SERIAL]，[UNITS]并将其替换为另一个文件中的其他内容。

我写了以下c程序

 fPOut = fopen（  final.txt ，  r）; 
 
  if （fPOut）
 
 {
 
 printf（ 文件为\ n \ n）; 
 
  do  
 
 
 {
 
 scanf（ ％c，& a [ 1 ]） ; 
 fgets（cString， 2000 ，fPOut）; 
 
 
 char * cStart = strchr（cString，'  ['）; 
 cStart ++; 
 char * cEnd = strtok（cString， ]）; 
 cEnd = '  \0'; 
 printf（ ％s，cStart）; 
 i ++; 
 
 
} 
 
  while （i< b）; 
 
} 
 
 
 fclose（fPOut）; 
 
} 

但它不起作用请帮忙。

解决方案

那是因为你假设你会在每一行找到'['和']'字符。你应该这样做：

  char  * cStart = strchr（cString，'  ['）; 
  if （cStart）
 {
  //  找到开括号 
 * cStart ++ = '  \0' ;  //  将字符串拆分为[ 
  char  * cEnd = strchr（cStart，' ]'）; 
  //  您可以在这里查看找到的近括号 
  //  如果不是则抛出异常 
 * cEnd = '  \0';  //  终止关键字 
 printf（  键：％s，值：％s，cString，cStart）; 
} 
  //  继续循环 

hi i'm trying to open this file(final.txt) & read the contents

c0001
f260
L
D11
H30
R0000
C0040
1X1100000100010B300300003003
181100202900027Part No
181100202900097[PRTNUM]
1e5504002400030B
1X1100002300010L300003
191100202000030Quantity
191100202000080[QUANTY]
1e5504001500040B
1X1100001400010L300003
1X1100001400150L003090
191100202000170P.O.No
191100202000220[PONUMB]
1e5504001500180B
191100201200030Supplier
1e3304000700030B
1X1100000600010L300003
181100200300030Serial
181100200300090[SERIAL]
171100300900190Rev
171100300300190[REV]
171100300900240Units
171100300300240[UNITS]
1X1100000100180L003130
Q0001
E


from which i only want to read [PRTNUM], [QUANTY], [PONUMB],[SERIAL],[UNITS] and replace them with the other contents in another file.
i've write following c program

fPOut = fopen("final.txt", "r");

    if(fPOut)

  {

     printf("The file is\n\n");

  do


  {

     scanf("%c", &a[1]);
     fgets(cString ,2000 ,fPOut);


    char* cStart = strchr(cString, '[');
    cStart++;
    char* cEnd = strtok(cString, "]");
    cEnd = '\0';
    printf("%s",cStart);
    i++;


  }

    while(i<b);

  }


      fclose(fPOut);

   }

but it is not working please help.

解决方案

That is because you are assuming you will find the '[' and ']' characters in each line. You should do it like this:

    char* cStart = strchr(cString, '[');
    if (cStart)
    {
        // open bracket found
        *cStart++ = '\0'; // split the string at [
        char* cEnd = strchr(cStart, ']');
        // you could check here for the close bracket being found
        // and throw an exception if not
        *cEnd = '\0'; // terminate the keyword
        printf("Key: %s, Value: %s",cString, cStart);
    }
// continue the loop

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