Objective-C

Async FTP Progress Info

See more FTP Examples

Demonstrates checking for progress info updates when running a task asynchronously. This example demonstrates an FTP download. Objective-C

#import <CkoFtp2.h>
#import <NSString.h>
#import <CkoTask.h>

BOOL success = NO;

//  This example assumes the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

CkoFtp2 *ftp = [[CkoFtp2 alloc] init];

ftp.Hostname = @"ftp.someFtpServer.com";
success = [ftp ConnectOnly];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

ftp.Username = @"myLogin";
ftp.Password = @"myPassword";
success = [ftp LoginAfterConnectOnly];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  Change to the remote directory where the file is located.
//  This step is only necessary if the file is not in the root directory
//  for the FTP account.
success = [ftp ChangeRemoteDir: @"someRemoteDirectory"];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

NSString *localFilename = @"/temp/romeo.xml";
NSString *remoteFilename = @"romeo.xml";

//  --------------------
//  Download a file
//  --------------------

//  Call the async version of the GetFile method to return a task object.
//  The task object is loaded, but is in the Inert state -- meaning it is
//  not yet scheduled to run on Chilkat's background thread pool.
CkoTask *task = [ftp GetFileAsync: remoteFilename localPath: localFilename];
if (ftp.LastMethodSuccess == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  Before starting the task, tell it to keep an in-memory log of what would've been
//  ProgressInfo callbacks.
task.KeepProgressLog = YES;

//  Schedule the task for running on the thread pool.  This changes the task's state
//  from Inert to Live.
success = [task Run];
if (success != YES) {
    NSLog(@"%@",task.LastErrorText);

    return;
}

//  The application is now free to do anything else
//  while the file is being downloaded.

//  For this example, we'll simply sleep and periodically
//  check to see if the download is finished, and report the progress
//  along the way.
int curPctDone = 0;
NSString *name = 0;
NSString *value = 0;

while (task.Finished != YES) {

    if ([task.PercentDone intValue] != curPctDone) {
        curPctDone = [task.PercentDone intValue];
        NSLog(@"%d%@",curPctDone,@" percent done");
    }

    //  Check the progress info log.
    //  Emit any log entries..
    while (([task.ProgressLogSize intValue] > 0)) {
        //  Get the 1st entry, emit it, and then remove it..
        name = [task ProgressInfoName: [NSNumber numberWithInt: 0]];
        value = [task ProgressInfoValue: [NSNumber numberWithInt: 0]];

        //  Entries reporting the received byte count will have the name "RcvByteCount"
        //  Entries reporting the current bytes-per-second will have the name "RcvBytesPerSec"

        NSLog(@"%@%@%@",name,@": ",value);
        [task RemoveProgressInfo: [NSNumber numberWithInt: 0]];
    }

    //  Sleep 100 ms.
    [task SleepMs: [NSNumber numberWithInt: 100]];

}

//  Just in case there are any remaining entries...
while (([task.ProgressLogSize intValue] > 0)) {
    //  Get the 1st entry, emit it, and then remove it..
    name = [task ProgressInfoName: [NSNumber numberWithInt: 0]];
    value = [task ProgressInfoValue: [NSNumber numberWithInt: 0]];
    NSLog(@"%@%@%@",name,@": ",value);
    [task RemoveProgressInfo: [NSNumber numberWithInt: 0]];
}

//  A finished task could be one that was canceled, aborted, or truly finished.  

//  If the task was "canceled", it was canceled prior to actually starting.  This could
//  happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
//  background thread pool scheduler.  

//  If the task was "aborted", it indicates that it was canceled while running in a background thread.  
//  The ResultErrorText will likely indicate that the task was aborted.

//  If the task "completed", then it ran to completion, but the actual success/failure of the method
//  is determined by the result obtained via a GetResult* method.  (A "completed" task will
//  have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
//  been aborted or canceled:
if ([task.StatusInt intValue] != 7) {
    NSLog(@"%@",@"Task did not complete.");
    NSLog(@"%@%@",@"task status: ",task.Status);

    return;
}

//  The GetFile method returns a boolean.  Therefore, after the task is finished,
//  we can get the boolean result by calling GetResultBool.  This is the return value had
//  we called GetFile synchronously.
success = [task GetResultBool];
if (success != YES) {
    //  The task's ResultErrorText contains what would have been in the LastErrorText property had
    //  the GetFile method been called synchronously.
    NSLog(@"%@",task.ResultErrorText);
}
else {
    NSLog(@"%@",@"File downloaded asynchronously.");
}

success = [ftp Disconnect];