如何从文件中提取文本范围 [英] How to extract a range of text from a file

问题描述

我正在尝试从输入文件"Test.txt"中提取一系列文本
范围从存储在pfst [0]中的字符串的出现开始到存储在pfet [0]中的字符串的开始.最终的o/p存储在文件"PerformSectionExtract.txt"中.

字符串值在解析之前可以正常打印，但是在进入解析机制之后，可以打印NULL值.以下是我的代码:

Hi,

I am trying to extract a range of text from an input file "Test.txt"
The range starts from the occurrence of a string stored in pfst[0] till the string stored in pfet[0]. The final o/p is stored in the file "PerformSectionExtract.txt".

The string values prints fine before the parsing, but NULL values are printed after entering the parsing mechanism. Below is my code :

char pfst[1500][50];
char pfet[1500][50];

char fileOrig[MAX_PATH] = "Test.txt";
char fileRepl2[MAX_PATH] = "PerformSectionExtract.txt";

FILE *fp1, *fp2, *fp3, *fp4;
fp1 = fopen(fileOrig,"r+");
fp4 = fopen(fileRepl2,"w+");



while(fgets(buffer,MAX_LEN_SINGLE_LINE+2,fp1))
		{
strcpy(buffer2,buffer);
length= strlen(pfst[0])-1;

if(strncmp(buffer2, pfst[0], length ) == 0 )
	{
	 found2=1;
	}
 if(found2 ==1)
	{
        sprintf(buffer4,"       %s",buffer);
        fputs(buffer4,fp4);
	   if(strstr(buffer,pfet[0]) != NULL)
		{
		found2 = 0;
		count2++;
                }
	}
}

当我对字符串进行如下硬编码时，代码可以正常工作

The code works fine when I hard code the string as below

if(strncmp(buffer2, "string entered here", length ) == 0 )

但是，这不会达到目的..:-(

预先感谢，
Faez

But, this won''t serve the purpose.. :-(

Thanks in advance,
Faez

推荐答案

这里有一些基本的代码可以正常工作，而无需到处复制缓冲区.我相信您可以轻松地使其适应您的需求.我不得不猜测您输入文件的实际内容，因此我还在下面添加了文件内容.

Here is some basic code that works without the necessity of copying buffers all over the place. I am sure you can easily adapt it to your needs. I have had to guess at the actual content of your input file so I have added the file contents below also.

FILE    *fpIn, *fpOut;
char    pfst[10][50];
char    pfet[10][50];
char    buffer[MAX_LEN_SINGLE_LINE];
int     length;
char*   tok;
int     found = 0;

fpIn = fopen("Test.txt", "r");
fpOut = fopen("PerformSectionExtract.txt","w");
    
while(fgets(buffer, MAX_LEN_SINGLE_LINE, fpIn))
{
    if(strncmp(buffer,"PERFORM",7) == 0 )
    {
        fputs("       ", fpOut);
        fputs(buffer, fpOut);
        tok = strtok(buffer + 8, ".\n");
        if (tok != NULL)
        {
            sprintf(pfst[0], "%s SECTION", tok);
            sprintf(pfet[0], "%s -EXIT", tok);
//          i++, j++, p++;
        }
        continue;
    }
    length = strlen(pfst[0]);

    if(strncmp(buffer, pfst[0], length ) == 0 )
    {
        found = 1;
    }
    if (found == 1)
    {
        fputs("       ", fpOut);
        fputs(buffer, fpOut);
        if(strstr(buffer, pfet[0]) != NULL)
        {
            found = 0;
//          count2++;
        }
    }
}

Test.txt

Test.txt

PERFORM test1

blah blah blah
test1 SECTION
test1 1
test1 2
test1 3
test1 -EXIT

ignored stuff 1
ignored stuff 2
ignored stuff 3

PERFORM nextTest
more ignored stuff 1
more ignored stuff 2
more ignored stuff 3

nextTest SECTION
nextTest 1
nextTest 2
nextTest 3
nextTest -EXIT

PerformSectionExtract.txt

PerformSectionExtract.txt

PERFORM test1
test1 SECTION
test1 1
test1 2
test1 3
test1 -EXIT
PERFORM nextTest
nextTest SECTION
nextTest 1
nextTest 2
nextTest 3
nextTest -EXIT

是否可以共享将字符串值分配给

Can you share the code where you have assigned string value to

pfst[0]

和

pfet[0]

这篇关于如何从文件中提取文本范围的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！