Working with strings in FM

[paul.s...@telenet.be]

Hi All,


This question might be lower than basic, but after countless number of attempts I don't care to be laughed at. It still remains a mist to me how strings behave in FM. There is a long list of string functions available, but alas no added lines of code of how to apply it in FM.

strcpy( str0, "RED, GREEN, BLUE");
This works,   setCtlTextv( 100, "    %s", str0);   reads correctly. But there are only 20 predefined variables in FM...

Therefore:
when I create a new char variable such as   char aa[ 256];
it reads shifted repeats from other char variables. What is wrong?

Since FM is C+ based, but not entirely works as C+, examples of C+ are rejected in the compiler.

- - - - - - - - - - - - - - - - - - - - - -

Question:
Would there be somebody so kind to list up some elementary, but in FM working examples of
1.   How to simply put a line of text into a variable, other than the 20 predefined ?
2.   And eventual: practical example of how to extract a selection, how to convert a character into a number, etc... ?


Thanks in advance !
Paul

[Duncan Suss]

Hi Paul,

My understanding is that you'd use malloc() and free() for this.

http://www.filtermeister.com/wiki/index.php?page=malloc

On the wiki page for malloc, there's this snippet of code:

%ffp

OnFilterStart:

{

    // Allocate a string for

    // 255 characters

    char* buffer_1 = malloc(255);

    // ... I think you could use

    // strcpy( buffer_1, "RED, GREEN, BLUE");

    // setCtlTextv( 100, "    %s", buffer_1);

    free(buffer_1);

}

I hope this helps - it's been a long time since I did any FM coding, my apologies if this is the wrong way to do it.

Duncan

[paul.s...@telenet.be]

Thanks Duncan,

I have made several attempts including minor variations, but immediately a warning of memory acces violation appears, with an ultimate crash of Photoshop if you force to continu. In the best case, the text I tried for testing appeared correctly, but not without all these warnings. So we still missing something essential, or maybe this feature in FM might be limited to the 20 premade str0 to str19?

I can work arround those string functions and look for different solutions, but nonetheless I would like to get these strings see to work!

Again, does somebody still have somewhere some code that works like it should do, to use as a basic example?


Regards,
Paul

---

Van: "Duncan Suss" <dunc...@gmail.com>
Aan: "FilterMeister Mailing List (FMML)" <filter...@googlegroups.com>
Verzonden: Zaterdag 25 februari 2023 14:17:23
Onderwerp: [FMML2] Re: Working with strings in FM

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[Duncan Suss]

Paul - I just remembered something which might be a partial explanation of what you are seeing.

Windows introduced a security feature called "DEP" (data execution protection, I think) that prevents programs from running code which they generated dynamically into memory. I don't remember when this was introduced - somewhere between XP and 7 I think.

Sorry I can't be any more help - I don't have a PC with a host for FM these days.

Duncan

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[paul.s...@telenet.be]

In anyway, thanks for the info!
As told I will find a solution to work this around and obtain the same goal.

Beside this, does anybody have some examples or old material from working with text features in FM? A lot of string functions are listed in the Wiki, but as far I can see there are no decent demo codes available.

To bring some news: I recently succeeded to develop a technique for stable speed measurements of functions and pieces of code in FM. Since the concept is a comparison between an empty scan with a similar scan including the test object, the results are device independent. The name I sticked on it is called the 'Time increase factor', or Ti for short. It works really very precise, with a repeatability near 1 procent. It revealed already some interesting surprises! I'm actually further finishing this tool. Within some weeks I will post some results. I would like to add these Ti factors step by step in the Wiki. It's undoubtedly of great help to make the right choices in building a new filter with maximized response and creates at least awareness of the speed penalty you get when the coding is messy.


Greetings to all,
Paul

---

Van: "Duncan Suss" <dunc...@gmail.com>
Aan: "FilterMeister Mailing List (FMML)" <filter...@googlegroups.com>

Verzonden: Zaterdag 4 maart 2023 15:58:02
Onderwerp: Re: [FMML2] Re: Working with strings in FM

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[paul.s...@telenet.be]

Hi John - Thanks for your response.
Don't you have some examples that demonstrates text items with this?

Greetings

---

Van: "John Weldy" <jwe...@frontiernet.net>
Aan: "paul simoens" <paul.s...@telenet.be>
Verzonden: Dinsdag 7 maart 2023 15:30:40

Onderwerp: Re: [FMML2] Re: Working with strings in FM

Hi Paul -- Just reading your note and more than likely you have tried this, but I have always used putArrayString and getArrayString FM calls to handle strings.   I shall be interested in your work.  I am an active listener on FMML, but rarely make comments.  Good luck with your efforts.

Cheers

John

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