Objective-C

Control ASCII Download Line Endings (CrlfMode)

Demonstrates the CrlfMode property, which controls line-ending conversion when downloading in ASCII transfer mode: 0 leaves them as received, 1 converts to CRLF, 2 to LF, and 3 to CR.

Background: When you deliberately download text in ASCII mode, CrlfMode lets you force the saved file's line endings to a specific convention — CRLF for Windows tools, LF for Unix — regardless of what the server sends. It applies only in ASCII mode, so pair it with SetTypeAscii; in the recommended default binary mode, bytes are preserved verbatim and this setting has no effect. Reserve ASCII mode (and this property) for the rare case where line-ending normalization of text is actually wanted.

Chilkat Objective-C Downloads

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Objective-C

#import <CkoFtp2.h>

BOOL success = NO;

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;
}

//  CrlfMode controls line-ending conversion for ASCII-mode downloads:
//    0 = leave line endings as received (default)
//    1 = convert to CRLF
//    2 = convert to LF
//    3 = convert to CR
//  Convert a downloaded text file's line endings to CRLF (useful when saving for Windows).
ftp.CrlfMode = [NSNumber numberWithInt:1];

//  CrlfMode applies only in ASCII transfer mode.
success = [ftp SetTypeAscii];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

success = [ftp GetFile: @"public_html/readme.txt" localPath: @"qa_output/readme.txt"];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Downloaded with CRLF line endings.");

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