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copied!<p>Try storing a file that's name begins with a period in some folder and then setting the file's hidden flag.</p> <p>a good place to put the hidden file would be an obscurely named file in the base of the users folder (~/), there are many obscure hidden files there so it is hard to know which one's you can and can't delete. example path: <em>~/.xdarwinprofile</em> or something equally official sounding.</p> <p>here is some code that should work to hide the file:</p> <pre><code>#include <assert.h> #include <stdio.h> #include <stddef.h> #include <string.h> #include <sys/attr.h> #include <sys/errno.h> #include <unistd.h> #include <sys/vnode.h> typedef struct attrlist attrlist_t; struct FInfoAttrBuf { u_int32_t length; fsobj_type_t objType; union { char rawBytes[32]; struct { FileInfo info; ExtendedFileInfo extInfo; } file; struct { FolderInfo info; ExtendedFolderInfo extInfo; } folder; } finderInfo; }; typedef struct FInfoAttrBuf FInfoAttrBuf; - (int)SetFileInvisibility:(NSString *)filePath state:(BOOL)isInvisible) { attrlist_t attrList; FInfoAttrBuf attrBuf; char *path = [filePath cStringUsingEncoding: NSUTF8StringEncoding]; memset(&attrList, 0, sizeof(attrList)); attrList.bitmapcount = ATTR_BIT_MAP_COUNT; attrList.commonattr = ATTR_CMN_OBJTYPE | ATTR_CMN_FNDRINFO; int err = getattrlist(path, &attrList, &attrBuf, sizeof(attrBuf), 0); if (err != 0) return errno; // attrBuf.objType = (VREG | VDIR), inconsequential for invisibility UInt16 flags = CFSwapInt16BigToHost(attrBuf.finderInfo.file.info.finderFlags); if (isInvisible) flags |= kIsInvisible; else flags &= (~kIsInvisible); attrBuf.finderInfo.file.info.finderFlags = CFSwapInt16HostToBig(flags); attrList.commonattr = ATTR_CMN_FNDRINFO; err = setattrlist(path, &attrList, attrBuf.finderInfo.rawBytes, sizeof(attrBuf.finderInfo.rawBytes), 0); return err; } </code></pre> <p>I modified this code from the answer to this question, you may find more helpful information there: <a href="https://stackoverflow.com/questions/2958991/how-to-make-a-file-invisible-in-finder-using-objective-c">How to make a file invisible in Finder using objective-c</a></p> <p>I have not tested this code but it should work. In fact, it is possible the code is unnecessary and just saving the file with a dot in front of the filename will work.</p> <p>If you have administrator privileges you can execute a sudo chmod on the file and set it to read only if you want, but you shouldn't make your app ask the user for their password. </p>

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