(Objective-C) SFTP Fsync -- Flush an Open File on the Server

Demonstrates how to flush the contents of an open file on the server. This example only works for servers that implement the fsync@openssh.com extension.

Note: This example requires Chilkat v9.5.0.71 or later.

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#import <CkoSFtp.h>
#import <NSString.h>

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

CkoSFtp *sftp = [[CkoSFtp alloc] init];

// Pass a domain or IP address..
BOOL success = [sftp Connect: @"my-sftp-server.com" port: [NSNumber numberWithInt: 22]];
if (success == YES) {
    success = [sftp AuthenticatePw: @"mySFtpLogin" password: @"mySFtpPassword"];
}

if (success == YES) {
    success = [sftp InitializeSftp];
}

if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Open a file on the server for writing.
NSString *handle = [sftp OpenFile: @"myTest.txt" access: @"writeOnly" createDisp: @"createTruncate"];
if (sftp.LastMethodSuccess != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Write some text to the file:
success = [sftp WriteFileText: handle charset: @"ansi" textData: @"abcdefghijklmnopqrstuvwxyz"];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Make sure the server flushes what we wrote to the disk..
// (this is requires a server that implements the fsync@openssh.com SFTP protocol extension)
success = [sftp Fsync: handle];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// ....
// ....

success = [sftp WriteFileText: handle charset: @"ansi" textData: @"ABCDEFGHIJKLMNOPQRSTUVWXYZ"];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Close the file.
success = [sftp CloseHandle: handle];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");