Deleting text

[Unregistered]

How do I delete a line of text in a text file without deleteing the entire file? Would switching to binary mode and then back to text help?

Thanks
Jeff

[Garfield]

Good question. You might try fputs with a whole slew of blank spaces. But, I don't think that'll work. And I don't know of any functions.

But try writing a lot of blank spaces to a line and see what happens.

--Garfield

[gliptic]

You could read in the whole file, copy the text after the line to the line and shorten down the file.

Pseudo code:

data = FileRead(sizeof(file));
memcpy(&data[startofline], &data[endofline], sizeof(file)-endofline);

FileWrite(data, sizeof(file)-startofline);

[bigtamscot]

If you know the full line of text in the file, as gliptic says read file.
I would suggest using the original file and a new file. Even if you knew the first field was unique e.g. refernece number, you should be able to delete the relevant line accordingly

 old_fp = fopen("oldfile.txt", "r")
new_fp = fopen("newfile.txt", "w")

while((fgets(str, record_length, old_fp))!= EOF)
{
    if(strcmp(known_textinfile, str))
    {
         fputs(str, new_fp);
    }
}

Ofcourse you will have to manipulate the code to your own specifications, new line characters ext.