C ++ MAC OS X无法写入〜/ Library / Application Support / <appname>

Question

If i save files inside the .app bundle, it saves OK, but apple recommends saving files inside the Application Support under

~/Library/Application Support/appname

or

~/Library/Application Support/bundleid

I tried both, but I am always getting an exception. I am getting a path to the Application Support, which is

/Users/myname/Library/Application Support/com.company.appname/

or

/Users/myname/Library/Application Support/AppName/

com.company.appname is specified correctly inside my info.plist , and AppName is product AppName.app , so the paths seems correct.

{
    FilepathProcessor::pathForFile(fpath, "menustate", ".sav", 
                                   PATH_TO_DESTINATION_SAVE_LOAD_FOLDER);

    std::ofstream file;
    file.exceptions(std::ofstream::eofbit | std::ofstream::failbit | 
                    std::ofstream::badbit);
    INFO_ARG("prepare to save to '%s'", fpath.c_str());

    try {
        file.open(fpath.c_str(), std::ios::out | std::ios::binary | 
                  std::ios::trunc);
        ERROR_IF_ARG(!file.is_open(), "couldnt open file for saving at '%s'",
                     fpath.c_str(), return);

        //will pass this point

        //exception happens by first write
        WRITE_INT_TO_BINFILE(file, episode);

        //...

    } 
    catch (std::ofstream::failure e) {
        ERROR_IF_ARG(true, "exception %s", e.what(), return);
    }
    file.close();
}

Output :

INFO : prepare to save to '/Users/myname/Library/Application
       Support/com.comapny.appname/menustate.sav' [CALLED BY : saveToFile]

ERROR! 
    Text : exception basic_ios::clear

Answer 1

The directory is not automatically created for you. Before saving the file, you first need to check if the directory exists, and if not, you need to create the directory.