Objective-C

Get an FTP Listing Entry's Size (32-bit)

Demonstrates the Chilkat Ftp2.GetSize method, which returns the size in bytes of a cached directory-listing entry as a 32-bit integer. The only argument is a zero-based index. It returns -1 when the index is invalid or the size is unavailable.

Background: The size comes from the cached listing, so reading it for every entry costs no extra round trips. A 32-bit result cannot represent files past about 2 GB, so use GetSize64 (or GetSizeStr) when large files are possible. Directories often report no meaningful size and come back as -1, which is why the -1 case is worth handling rather than printing blindly.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the Ftp2.GetSize method, which returns the size in bytes of a cached
//  directory-listing entry as a 32-bit integer.  The only argument is a zero-based index.

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

ftp.Hostname = @"ftp.example.com";
ftp.Username = @"myFtpLogin";

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
ftp.Password = @"myPassword";

success = [ftp Connect];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

success = [ftp ChangeRemoteDir: @"public_html"];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  GetDirCount retrieves the directory listing on the first call and returns the number of
//  entries.  A negative return indicates failure.
int n = [[ftp GetDirCount] intValue];
if (n < 0) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

int i;
for (i = 0; i <= n - 1; i++) {
    NSString *name = [ftp GetFilename: [NSNumber numberWithInt: i]];

    //  GetSize returns -1 when the index is invalid or the size is unavailable (for example for a
    //  directory).  Use GetSize64 for files that may exceed 2 GB.
    int fileSize = [[ftp GetSize: [NSNumber numberWithInt: i]] intValue];
    NSLog(@"%@%@%d%@",name,@"  ",fileSize,@" bytes");
}

success = [ftp Disconnect];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}