On 09/08/2011 03:33 p.m., Ricardo Aráoz wrote:
> On 09/08/2011 02:38 p.m., MB Software Solutions, LLC wrote:
>> On 8/9/2011 1:23 PM, John Weller wrote:
>>> I think that is a much better idea! You have more control and it is only
>>> reading a line at a time so there will not be any memory issues (famous last
>>> words :-) )
>> The last time I wrote any LLFF code, it was in BASIC and/or PASCAL over
>> 15 years ago! lol
>>
>> Looks like I'll use FOPEN to get the handle and FREAD to read each line.
>> How do I determine the number of lines (without using ALINES)...would
>> be it the number of bytes returned from FREAD divided by the record
>> length? Also, would I use FSEEK to increment along the file inside a
>> loop like so?
>>
>> liRecLength = 550
>> liHandle = fopen("myfile.txt")
>> do while not feof(liHandle)
>> lcLine = fread(liHandle,liRecLength)
>> * now do whatever processing on the lcLine variable
>> enddo
>>
>>
>> Does that look about right? tia!
>
> You might also try :
>
> create cursor MyCursor (fileContents m)
> append blank
> append memo fileContents from 'myfile.txt' overwrite
>
> set memowidth to 8192 && if your file has lines bigger than 8192 chars
> you are screwed!
> for LineNo = 1 to MemLines(filecontents)
> LineBeingProcessed = MLINE(fileContents, /LineNo)/
> && Process the line
> endfor
>
> If this last for loop is too slow check out _MLINE in your VFP help
> which is a much faster (less readable) method.
>
> I always find it easier this way than with fread()
Forgot to tell you that with this approach I can forget about somebody
else accessing/modifying the file at the same time I'm processing it,
VFP solves that and gives me a copy of the file in a memo field where I
can work without worries.
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