(Objective-C) Directory Existence Check

How to test if a directory exists on an FTP server.

A good way to check to see if a directory already exists is to try to "cd" to that remote directory by calling ChangeRemoteDir. If it succeeds, then the directory exists. If not, then it does not exist. An alternative method is to set the ListPattern = "*" and then iterate over the files/directories, looking for the directory.

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#import <CkoFtp2.h>
#import <NSString.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 = @"login";
ftp.Password = @"password";

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

// Does the "temp" directory exist?
BOOL dirExists;
dirExists = [ftp ChangeRemoteDir: @"/temp"];
if (dirExists == YES) {
    NSLog(@"%@",@"Yes, the temp directory exists.");
    //  Yes, it exists. Restore the current remote dir:
    success = [ftp ChangeRemoteDir: @".."];
    if (success != YES) {
        NSLog(@"%@",ftp.LastErrorText);
        return;
    }

}

// Alternatively, you may set the ListPattern = "*" and 
//  look for the directory:
ftp.ListPattern = @"*";

int i;
int n;
n = [[ftp GetDirCount] intValue];
if (n < 0) {
    // Failed to get directory listing based on ListPattern
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

if (n > 0) {
    for (i = 0; i <= n - 1; i++) {
        BOOL isDir;
        isDir = [ftp GetIsDirectory: [NSNumber numberWithInt: i]];
        if (isDir == YES) {
            NSString *fname = 0;
            fname = [ftp GetFilename: [NSNumber numberWithInt: i]];
            if (fname == @"temp") {
                NSLog(@"%@",@"Found temp directory!");
                success = [ftp Disconnect];
                return;
            }

        }

    }

}

success = [ftp Disconnect];