Making "read from file" less blocky.

Bob Sneidar bobsneidar at iotecdigital.com
Sun Aug 4 23:26:06 EDT 2019


The trick is to create an independent process. A standalone that listens for messages. Pass it some parameters and go on about your business. Multithreaded computing on demand. AppleScript or open process doesn’t matter. 

Sent from my iPhone

> On Aug 3, 2019, at 19:09, Dar Scott Consulting via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Alas, only read from socket allows a message to be sent upon completion. The step siblings read from file, read from process and read from driver do not.
> 
> Here are a few things you might do:
> 
> 1. Try making the file loading very fast and don't do it in the background. Change the cursor if need be.  Try using URL with file: or binfile:, maybe that is fast.
> 
> 2. Use a "send loop" to read in portions and update a progress bar. You can get help here on how to do that.
> 
> 3. Process the file lazily and bring in parts as needed.
> 
> 4. Figure out how to make the file read through networking. Somehow. Maybe.
> 
> 
>> On Aug 3, 2019, at 6:56 PM, Tom Glod via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> Hey folks,
>> 
>> I'm having trouble finding a combination of settings that allows my file
>> loading  to seem to happen in the background.
>> 
>> repeat while read_result is not "eof"
>>        read from file ThisFile for (1024 * 1000) bytes
>>        put the result into read_result
>>        put it after IntoThisVariable
>>        add length(it) to amount_read
>>        TSTProgress amount_read,ExpectedSize,"%","Loading File ..."
>> (Progress Indicator Handler)
>>        wait 10 milliseconds with messages
>>     end repeat
>> 
>> no matter what I try, its still sluggish, and it seems like messages are
>> still accumilating instead of being processed by the engine.
>> 
>> Am I missing something?  Normally waiting with messages sufficiently frees
>> the engine to allow the UI to remain responsive.
>> 
>> Thanks,
>> 
>> Tom
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