(Objective-C) File Existence Check

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes.

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoFtp2.h>

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

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

ftp.Hostname = @"ftp.example.com";
ftp.Username = @"username";
ftp.Password = @"password";

// Connect and login to the FTP server.
BOOL success = [ftp Connect];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// Set the current remote directory to where the file is located:
success = [ftp ChangeRemoteDir: @"something"];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// Test to see if the file exists by getting the file size by name. 
// If a -1 is returned, the file does not exist.
int fileSize = [[ftp GetSizeByName: @"test123.txt"] intValue];
if (fileSize < 0) {
    NSLog(@"%@",@"file does not exist");
}
else {
    NSLog(@"%@%d%@",@"file exists and is ",fileSize,@" bytes in size");
}

success = [ftp Disconnect];