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 <CkFtp2.h>

void ChilkatSample(void)
    {
    CkFtp2 ftp;

    bool success;

    //  Any string unlocks the component for the 1st 30-days.
    success = ftp.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        printf("%s\n",ftp.lastErrorText());
        return;
    }

    ftp.put_Hostname("ftp.***.com");
    ftp.put_Username("***");
    ftp.put_Password("***");

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

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

    ftp.Disconnect();
    }