Text File Manipulation

[compman9902]

Hello, and thank you for taking the time to read this post. Here is my problem: every time i try to open up a text file, in a program, and try to add something to the end of it on a new line, then it erases the entire file and only puts in the single line. Thank you very much in advance for your help and dedication to these forums.



--Parker Woods
--MonsterHackz DEV Team

[gpraghuram]

Hi,
Then it means u are opening the file in write mode.
Open the file in append mode if u want add any info o open in read mode if u only want to read info.
Thanks
Raghuram

[compman9902]

Hi,
Then it means u are opening the file in write mode.
Open the file in append mode if u want add any info o open in read mode if u only want to read info.
Thanks
Raghuram

That was very......helpful
could I please have some code with that?
just, use this example:

ofstream filesave ("C:\\my text file.txt");
if (filesave.is_open())
{
filesave << testToBeAdded;
filesave.close();
}
else
{
cout << "The File Was Unable To Open For An Unknown Reason." << endl;
cout << "                  Program Terminated" << endl;
system("PAUSE");
return 0;
}
 

thanks

[compman9902]

That was very......helpful
could I please have some code with that?
just, use this example:

ofstream filesave ("C:\\my text file.txt");
if (filesave.is_open())
{
filesave << testToBeAdded;
filesave.close();
}
else
{
cout << "The File Was Unable To Open For An Unknown Reason." << endl;
cout << "                  Program Terminated" << endl;
system("PAUSE");
return 0;
}
 

thanks

Well, I just figureed out how to append text files. But, now the question is a little bit harder: How do I add the line of text that I want to the end of the file? Every time I run the program, it just rewirtes the first line. How do I fix this?



--Parker Woods
--MonsterHackz DEV Team

[ilikepython]

Well, I just figureed out how to append text files. But, now the question is a little bit harder: How do I add the line of text that I want to the end of the file? Every time I run the program, it just rewirtes the first line. How do I fix this?



--Parker Woods
--MonsterHackz DEV Team

You could use the fseek() function. Look at this:
http://www.cplusplus.com/reference/c...dio/fseek.html

[bluesteel]

Well, I just figureed out how to append text files. But, now the question is a little bit harder: How do I add the line of text that I want to the end of the file? Every time I run the program, it just rewirtes the first line. How do I fix this?



--Parker Woods
--MonsterHackz DEV Team

Well, i have done it, not in a very practical way but anyway.
I used fopen("Filename","mode"); where mode was the mode it would be opened, i used "r+" because it let you open without erasing and you could also edit.
To get to the end, i used some functions, although i know it is quite impractical but at least it does work.

FILE *myfile;
if((myfile=fopen("File.txt","r+"))==NULL)printf("File could not be opened");
else {
while(!feof(myfile)){//while it is not the end
fgetc(myfile);
}
}

Then you will get to the end.
You can also write '\n' so that you write in the following line.
For that i use fwrite().
The syntax is fwrite("Text",int length,int times,file);
you would use it in this way:
fwrite("Hello World",11,1,myfile);
The second parameter is not exactly the size, it's the length in bytes, but since a character is a byte, then you can say it's the size in number of words.
If you want to write a value stored in an array write & before the name of the string

[compman9902]

Well, i have done it, not in a very practical way but anyway.
I used fopen("Filename","mode"); where mode was the mode it would be opened, i used "r+" because it let you open without erasing and you could also edit.
To get to the end, i used some functions, although i know it is quite impractical but at least it does work.

FILE *myfile;
if((myfile=fopen("File.txt","r+"))==NULL)printf("File could not be opened");
else {
while(!feof(myfile)){//while it is not the end
fgetc(myfile);
}
}

Then you will get to the end.
You can also write '\n' so that you write in the following line.
For that i use fwrite().
The syntax is fwrite("Text",int length,int times,file);
you would use it in this way:
fwrite("Hello World",11,1,myfile);
The second parameter is not exactly the size, it's the length in bytes, but since a character is a byte, then you can say it's the size in number of words.
If you want to write a value stored in an array write & before the name of the string

These are all great solutions, but I do not want to use fopen() or fseek(). I only can use fstream. Sorry, and thank you for you help.