file i/o

This is a discussion on file i/o within the C++ Programming forums, part of the General Programming Boards category; what search method and what replacing method should i use to search a file for occurances of a word and ...

  1. #1
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    file i/o

    what search method and what replacing method should i use to search a file for occurances of a word and then replace those occurances with another word?

  2. #2
    Registered User blight2c's Avatar
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    can you just use getline() then run it through a loop? or am i outta my league?

  3. #3
    Xei
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    This is what I use

    The function that I use is this:
    You may have to create this into a Prototype function or else put inside of a Class.

    int msovf::Instr(LPCSTR String,LPCSTR Search)
    {
    CHAR *sResult;
    int iLocation;
    sResult = strstr(String,Search);
    iLocation = sResult - String;
    if(iLocation < 0)
    {
    return -1;
    }
    return iLocation;
    }


    The 'strstr' call searches for text... basically. So you do something like this:

    int x = Instr("Where did my car go!?","car");
    Then I believe it should return a 12(in this case, otherwise the location of whatever you are looking for). If the instance is not found it should return a -1. I hope that this works to help you with whatever you need it for.

  4. #4
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    Use grep instead of programming yourself.
    Hello, everyone.

  5. #5
    Xei
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    What is grep?

  6. #6
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    i kinda have to code it the old school way :P

    here what i have to date :P
    doesnt work yet :P
    Code:
    #include <iostream.h>
    #include <fstream.h>
    #include <string.h>
    
    int main()
    {
    	char filename[20], wordtofind[20], wordtoreplace[20], input[200];
    	int length=0,length2=0, count=0, count2=0, temp;
    	cout<<"Enter the name of file: ";
    	cin>>filename;
    	cin.ignore(20,'\n');
    	cout<<"Enter word to search for: ";	
    	cin.getline(wordtofind,20);
    	cout<<"Enter word to replace it with: ";
    	cin.getline(wordtoreplace,20);
    	length=strlen(wordtofind);
    	fstream file;
    	file.open(filename,ios::nocreate|ios::in|ios::out);
    	if(file.fail()){
    		cout<<"File could not be openend"<<endl;
    		return (0);
    	}
    	else{
    		while(cin.getline(input,200,'\n'))
    		{
    			length2=strlen(input);
    			for(count=0;count<length2;count++)
    			{
    				if(input[count]==wordtofind[0]){
    					temp=count;
    					for(count2=0;count2<=length;count2++)
    					{
    						if(input[temp++]!=wordtofind[count2])
    							break;
    						if(count2==length)
    						{
    							file<<wordtoreplace;
    						}
    					}
    					
    				}
    			}
    		}
    		}
    	file.close();
    
    	return (0);
    }

  7. #7
    Registered User billholm's Avatar
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    Smile gogogo!

    Refrain from using grep

    Coding it urself is much more exciting. It helps sharpen ur skills.

  8. #8
    Xei
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    What? oldschool way? Why?

    I guess you could just use CopyMemory to copy the string into an array then check it byte by byte... until you find alternatives.

    But still... why what you call oldschool?

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