How2 Seach file for string ???

[skinah]

I'm slowly learning visual c++ and need a little bit of help.

How do I search the contents of a file for a string ?

For example I wish to search a text file say (test.txt) that I know the name of for the words "hello" . I dont know the exact location of the words and dont care about the location, I just need to know if the file contains "hello" and then execute some commands if it exsists.

Any help would be apreeciated and source code to pull apart also helps me heaps.

 

[hcexi]

You can use STL stuff... X-)

#include <string>
#include <fstream>
#include <iostream>

int main()
{
	std::ifstream file( &quot;c:\\test.txt&quot; );
	if ( ! file )
		return 1;

	bool found = false;

	do
	{
		std::string line;
		std::getline( file, line );
		if ( line.find( &quot;hello&quot; ) != std::string::npos )
			found = true;			

	} while( file && ! found );

	if ( found )
		std::cout << &quot;we got it!\a&quot; << std::endl;

	return 0;
}

 

[jvff]

Do it the hard way:

Include the header(

#include <stdio.h>

)
Declarate the buffer(

char a;

)
Declarate the exit(

bool exit;

)
Declarate the position(

unsigned long int pos;

)
Open a file (

FILE *b = fopen("C:\\file", "r");

)
Make it loop while it doesn't find the text(

while((exit == FALSE) && (a != EOF))
{
    a = fgetc(b);
    pos++;
    if(a == 't')
    {
        a = fgetc(b);
        if(a == 'e')
        {
            a = fgetc(b);
            if(a == 'x')
            {
                a = fgetc(b);
                if(a == 't')
                {
                    exit = TRUE;
                    pos--;
                }
            }
        }
    }
}

)
Then you will know the "text" starts at pos. You may even continue what you will do in the ifs. All together it'll be like this:

#include <stdio.h>

char a;
bool exit;
unsigned long int pos;

FILE *b = fopen(&quot;C:\\file&quot;, &quot;r&quot;);

while((exit == FALSE) && (a != EOF))
{
    a = fgetc(b);
    pos++;
    if(a == 't')
    {
        a = fgetc(b);
        if(a == 'e')
        {
            a = fgetc(b);
            if(a == 'x')
            {
                a = fgetc(b);
                if(a == 't')
                {
                    exit = TRUE;
                    pos--;
                }
            }
        }
    }
}

;-) Thank you,

JVFF (Janito Vaqueiro Ferreira Filho)

 

[DavesTips]

I assume this is a joke - when you want to find something else you write a new program... Hope that this helped! ;-)