Question

我创建了一个FSEvent来处理文件更改。我的问题是，我第一次保存文件（它发生在Microsoft文件，例如“.docx”，“。xls”...文件），事件被触发两次。我需要显示用户消息，并显示两次。这是我的源代码：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
NSString *application_directory = [paths objectAtIndex:0];  
NSString *folder_path = [NSString stringWithFormat:@"%@/%@", application_directory, path];

CFStringRef file_path_ref = (CFStringRef) folder_path;

CFArrayRef pathsToWatch = CFArrayCreate(NULL, (const void **)&file_path_ref, 1, NULL);
void *appPointer = (void *)self;
FSEventStreamContext context = {0, appPointer, NULL, NULL, NULL}; // could put stream-specific data here.
CFAbsoluteTime latency = 3.0; /* Latency in seconds */

//Create the stream, passing in a callback 
stream = FSEventStreamCreate(NULL,
                             &mycallback,
                             &context,
                             pathsToWatch,
                             kFSEventStreamEventIdSinceNow, 
                             latency,
                             kFSEventStreamCreateFlagUseCFTypes 
                             );

FSEventStreamScheduleWithRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
FSEventStreamStart(stream);
CFRunLoopRun();

这是回调方法：

void mycallback(ConstFSEventStreamRef streamRef,
            void *clientCallBackInfo,
            size_t numEvents,
            void *eventPaths,
            const FSEventStreamEventFlags eventFlags[],
            const FSEventStreamEventId eventIds[]){

int i;

for (i=0; i<numEvents; i++) 
{   
    DirectoryWatcher *directory_watcher = (DirectoryWatcher *)clientCallBackInfo;

    NSFileManager *file_manager = [NSFileManager defaultManager];

    Common *common = [[Common alloc] init];
    NSString *file_path = [common filePathByNameAndId:directory_watcher.file_name file_id:directory_watcher.file_id];

    NSDictionary *fileAttributes = [file_manager attributesOfItemAtPath:file_path error:NULL];
    [common release];

    NSDate *modified_date = [fileAttributes objectForKey:@"NSFileModificationDate"];
    NSDate *saved_date = [[NSUserDefaults standardUserDefaults] objectForKey:@"kFeedLastModified"];

    [[NSUserDefaults standardUserDefaults] setObject:modified_date forKey:@"kFeedLastModified"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    if (![modified_date isEqualToDate: saved_date])
     {
         Common *common = [[Common alloc] init];
         if([common networkConectivityAvailable])
         {
             //HERE IS MY USER MESSAGE
         }
         else
         {
             NSLog(@"Retry this flow when internet is restored.");
         }

         [common release];
     } 
}    }

Answer 1

听起来微软在写出文件时做了一些愚蠢的事情......实际上，你永远不会指望每个应用程序的行为一致和/或正确。

我的建议是只显示一个警报（如果还没有显示）（即可以解决从Microsoft应用程序触发的多个FSEvents的问题）。或者将警报排队并按顺序显示它们，确保仅在适当时显示后续警报（即，当已经过了一定的时间或后续操作是在不同的文件上时等）。

保存文件时，FSEvent将触发两次

1 个答案: