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Fseek() and fgets()
Message
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
00124862
Message ID:
00124865
Vues:
17
>Hello All,
>I have an app that needs to fopen an ascii file,
>fgets() pulls out the first string.
>I manipulate the data here and then;
>I need to overwrite the line with the new info.
>All this inside a DO while Not feof() loop;
>
>I am not using fputs() to write the line becuase various
>sources of these ascii files may have different carriage returns so I have determined before hand what the return is and store it in a variable. THis way I can =fwrite(maniupateed data + variable)
>
>My problem is I am not successfully moving down with the file
>pointer thus never gettting to FEOF().
>
>I know the length of each record and I also have a counter as I go down the file. SO, I could do an fseek() to the top of the fiel and then move down by string length * the counter.
>
>How do I do this?
>Thanks,
>Sandy

The more reliable way is to built string moving through the file:
DO WHILE NOT FEOF()
cString=cString+manipulate(fgets())+'neseccary carriage returns"
ENDDO
When this loop is over, you Fcreate() new file and Fwrite() this string there. The source file can be deleted afterward
Edward Pikman
Independent Consultant
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