Dynamic filename via concatenation?

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

Hi All,

For writing data to .cvs text, it would be useful to be able to change the filename dynamically via concatenation. Currently, I have to rename the already saved file every time or place it in a different folder to avoid overwriting.

For example, I use the filename

"Pix2Text_00",

"Pix2Text_01", etc...

to have an incrementing numbering.

Or another possibility would be to use date and time as a prefix

strdate( str0); strtime( str1);

"2026/04/07-17:24-Pix2Text"

to never have a duplicate filename.

I haven't managed to get this to work as a path. Is there a solution or workaround possible within FM?

In short, this is the method:

- Pixel values ​​are scanned and placed in an Array.

- The Array is read to a pointer and written to a file.

int iA0; 

void* iv00; 

allocArray( 0, x, y, 0, 4); 

... 

putArray( 0, x, y, 0, src( ix0, iy0, 0)); 

iv00 = fopen( "C:\\FM\\TestData\\Pix2Text_00.txt", "w"); 

... 

iA0 =getArray( 0, ix0, iy0, 0); 

fprintf( iv00, "%d,", iA0);

Kind regards,

Paul Simoens

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[Duncan Suss]

Hi Paul,

Have you tried using strcat to add a simple prefix (or suffix) to the filename? By simple, I mean NOT  "2026/04/07-17:24-Pix2Text" which contains some characters that are very likely to upset the compiler or the operating system or both. Try no slashes and no colons - e.g. "2026_04_07_17_24_Pix2Text" 

It's been a long time since I wrote any FM or C code, the problem might be way deeper than just the characters you chose to name the file.

Regards,

Duncan

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

Working with strings remains a blind spot for me due the missing of concrete examples (of this kind).

Key is to concatenate a filename that will be accepted as a path.

I found this in the FM-Wiki. Can some of you complete this to a working example?

E.g. "Pix2Text_" + ctl( 0) +".txt"

becomes "Pix2Text_00.txt" ?

To be used as:

iv00 = fopen( "C:\\FM\\TestData\\Pix2Text_00.txt", "w"); 

- - - - - - -

Syntax

char* strcat(char *dest, const char* src)

Arguments

dest

The destination string to which the source string is to be appended.

src

The source string to be appended on the destination.


Regards, Paul

---

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Van: "Duncan Suss" <dunc...@gmail.com>
Cc: "filtermeister" <filter...@googlegroups.com>
Verzonden: Woensdag 8 april 2026 14:34:45
Onderwerp: Re: [FMML2] Dynamic filename via concatenation?

[Duncan Suss]

I don't have a PC with FM installed these days, but I might be able to put together some code in C that could point you the right direction. It'll take me a couple of days - if anyone else can help you will likely get a faster and better piece of test code.

Duncan

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