[Plugin: Really Simple CAPTCHA] Unable to open [image] for writing

Do you use the latest version of the plugin?

I’d say yes.
Readme.txt: Stable tag: 1.5
really-simple-captcha.php: Version: 1.5

Maybe it’s not the latest version (1.5). Because there is no imagepng() at really-simple-captcha.php line 127 and no fopen() at really-simple-captcha.php line 147 in the version. Try reinstalling it.

Weird…
I just re-installed (deactivated, deleted and re-installed) it.
And in line 126 there is still “imagepng”!

From the Really Simple CAPTCHA.php file:

Author: Takayuki Miyoshi
Version: 1.5
Author URI: https://ideasilo.wordpress.com/

switch ( $this->img_type ) {
case 'jpeg':
$filename = sanitize_file_name( $prefix . '.jpeg' );
imagejpeg( $im, $dir . $filename );
break;
case 'gif':
$filename = sanitize_file_name( $prefix . '.gif' );
imagegif( $im, $dir . $filename );
break;
case 'png':
default:
$filename = sanitize_file_name( $prefix . '.png' );
imagepng( $im, $dir . $filename );
}

Line #144
if ( $fh = fopen( $answer_file, 'w' ) ) {

This is the version I’ve downloaded from my admin panel…??
Do you have something else?

Yes, Really Simple CAPTCHA 1.5 surely has imagepng() at line 126 and fopen() at line 144. But note that what your error message showed was different.

Warning: imagepng() [function.imagepng]: Unable to open ‘/home/…/html/WP/wp-content/uploads/wpcf7_captcha/1746827751.png’ for writing: Permission denied in /home/…/html/WP/wp-content/plugins/really-simple-captcha/really-simple-captcha.php on line 127

Warning: fopen(/home/…/html/WP/wp-content/uploads/wpcf7_captcha/1746827751.txt) [function.fopen]: failed to open stream: Permission denied in /home/…/html/WP/wp-content/plugins/really-simple-captcha/really-simple-captcha.php on line 147

Ok now … I’ve added an extra line with characters on top… that’s why all the line numbers moved by one or two. ?? Should’ve told you that sooner.

So, any idea to as why it does that? Any way to fix this?
No matter what linenumber of code…

Google for “wpcf7_captcha failed to open stream” and I’ve gotten more than 1000 results back…

Thanks.

I think I got it:

Change in really-simple-captcha.php these two lines from whatever it was to 0664.
0664 = read-write by owner and group, read by others

/* Mode of temporary image files */
$this->file_mode = 0644;

/* Mode of temporary answer text files */
$this->answer_file_mode = 0644;

So far, no error message!