(Unicode 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.

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#include <CkFtp2W.h>

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

    CkFtp2W ftp;

    ftp.put_Hostname(L"ftp.example.com");
    ftp.put_Username(L"username");
    ftp.put_Password(L"password");

    // Connect and login to the FTP server.
    bool success = ftp.Connect();
    if (success != true) {
        wprintf(L"%s\n",ftp.lastErrorText());
        return;
    }

    // Set the current remote directory to where the file is located:
    success = ftp.ChangeRemoteDir(L"something");
    if (success != true) {
        wprintf(L"%s\n",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(L"test123.txt");
    if (fileSize < 0) {
        wprintf(L"file does not exist\n");
    }
    else {
        wprintf(L"file exists and is %d bytes in size\n",fileSize);
    }

    success = ftp.Disconnect();
    }