iPhone: Fontconfig error: Cannot load default config file - iphone

Question

I have the following problem:
I included a static library of FontConfig libfontconfig.a into my iPhone project.
The application is building and i can run it on the device but when I do a call to a method that needs some functions of this library the application crashes with the following error
Fontconfig error: Cannot load default config file
terminate called throwing an exception
I read that this error normally occurs when FontConfig cannot find the fonts.conf file that is normally located in /etc/fonts.
But I cannot move that file to this directory of the iPhone. Has anyone a solution? Just copying the file to the application bundle did not help, as well.
I would appreciate any help.

Answer 1

I finally found a way to solve this problem. I set an Environment Variable FONTCONFIG_FILE and FONTCONFIG_PATH that define the locations of the fonts.conf file and the path that was before /etc/fonts. So I can add the fonts directory to the project and define the path #runtime.
The Environment Variables have to be set in your code before you call a method that needs a functionality of FontConfig. I set it after starting my Application in the AppDelegate.
Here is the code I added:
//Get the directory of your Application
NSString *bundlePath = [[NSBundle mainBundle] resourcePath];
//Create a String with the location of your fonts.conf file
NSString *fontconfigFile= [bundlePath stringByAppendingString:
[NSString stringWithFormat:#"/fonts/fonts.conf"]];
//Create a String with the path of the FontConfig configuration path
NSString *fontconfigPath= [bundlePath stringByAppendingString:
[NSString stringWithFormat:#"/fonts"]];
//Set the Environment Variables
setenv("FONTCONFIG_FILE", [fontconfigFile UTF8String], 0);
setenv("FONTCONFIG_PATH", [fontconfigPath UTF8String], 0);
In a second step I had then to modify my fonts.conf file. I added the fonts directory to FC/fonts and the cache directory to FC/cache of my project and adjusted the fonts.conf file on two parts.
I changed the first part:
<!-- Font directory list -->
<dir>/usr/share/fonts</dir>
<dir>/usr/X11R6/lib/X11/fonts</dir>
<dir>~/.fonts</dir>
to:
<!-- Font directory list -->
<dir>FC/fonts</dir>
and the second part:
<!-- Font cache directory list -->
<cachedir>/opt/local/fc1407cd/var/cache/fontconfig</cachedir>
<cachedir>~/.fontconfig</cachedir>
to:
<!-- Font cache directory list -->
<cachedir>FC/cache</cachedir>
Then it did not crash anymore.