file-access

问题 I am running into an issue with a FileSystemWatcher when multiple files are placed into the watched directory. I want to parse the file as soon as it is placed in the directory. Typically, the first file parses fine, but adding a second file to the directory causes an access issue. Occasionally, the first file doesn\'t even parse. There is only one application running and watching this directory. Eventually, this process will be running on multiple machines and they will be watching a shared

问题 Basically, I would like to check if I have rights to open the file before I actually try to open it; I do not want to use a try/catch for this check unless I have to. Is there a file access property I can check before hand? 回答1: I have done this countless times in the past, and nearly every time I've done it I was wrong to even make the attempt. File permissions (even file existence) are volatile — they can change at any time. Thanks to Murphy's Law this especially includes the brief period

问题 Is there local file manipulation that\'s been done with JavaScript? I\'m looking for a solution that can be accomplished with no install footprint like requiring Adobe AIR. Specifically, I\'d like to read the contents from a file and write those contents to another file. At this point I\'m not worried about gaining permissions and am just assuming I already have full permissions to these files. 回答1: If the user selects a file via <input type="file"> , you can read and process that file using