write the files in root directory in jailbreak phone,permitted?

问题

my phone was jailbreak,I want to write the files in /var/mobile/Documents/, I using the NSFileManager to working,but it cant working, I print the error log was "The operation couldn’t be completed. Operation not permitted", ok,I think NSFileManager just can using in sandbox maybe that I using the C(fread and fwrite), but also the file just can read,cant write,how to fix it,I just want write the file to the outside of the sandbox directory in my app?

回答1:

Have you tried doing with the default C standard IO method? This has worked perfectly for me in the past:

FILE *file = fopen("/debugging_private_data.txt", "w");
if(!file){
    // log an error opening file
} else {
    fprintf(file, "My value: %d\n", x);
    fclose(file);
}

This creates the file debugging_private_data.txt at the root directory. If you can write there (have root permission), you can write anywhere I guess.

来源：https://stackoverflow.com/questions/20113402/write-the-files-in-root-directory-in-jailbreak-phone-permitted