(C# UWP/WinRT) 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.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

ftp.Hostname = "ftp.example.com";
ftp.Username = "login";
ftp.Password = "password";

// Connect and login to the FTP server.
bool success = await ftp.ConnectAsync();
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

// Does the "temp" directory exist?
bool dirExists;
dirExists = await ftp.ChangeRemoteDirAsync("/temp");
if (dirExists == true) {
    Debug.WriteLine("Yes, the temp directory exists.");
    //  Yes, it exists. Restore the current remote dir:
    success = await ftp.ChangeRemoteDirAsync("..");
    if (success != true) {
        Debug.WriteLine(ftp.LastErrorText);
        return;
    }

}

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

int i;
int n;
n = await ftp.GetDirCountAsync();
if (n < 0) {
    // Failed to get directory listing based on ListPattern
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

if (n > 0) {
    for (i = 0; i <= n - 1; i++) {
        bool isDir;
        isDir = await ftp.GetIsDirectoryAsync(i);
        if (isDir == true) {
            string fname;
            fname = await ftp.GetFilenameAsync(i);
            if (fname == "temp") {
                Debug.WriteLine("Found temp directory!");
                success = await ftp.DisconnectAsync();
                return;
            }

        }

    }

}

success = await ftp.DisconnectAsync();