Objective-C

Download an FTP File into a BinData

Demonstrates the Chilkat Ftp2.GetFileBd method, which downloads a remote file and appends its bytes to a BinData. The first argument is the remote file path and the second is the BinData. No decoding or line-ending conversion is performed.

Background: Downloading into memory avoids a temporary local file when you intend to hash, parse, or forward the bytes immediately. Because it appends, existing bytes in the BinData are preserved — handy for concatenating several remote files, but clear it first when you want only this one. Since no conversion is applied, this is the safe way to pull content regardless of the current transfer type — which defaults to binary (SetTypeBinary), the recommended setting for essentially every file, text included. The SetTypeAscii mode applies legacy CRLF translation and is rarely needed.

Chilkat Objective-C Downloads

Download Chilkat for Objective-C

Objective-C

#import <CkoFtp2.h>
#import <CkoBinData.h>

BOOL success = NO;

//  Demonstrates the Ftp2.GetFileBd method, which downloads a remote file and appends its bytes to
//  a BinData.  The 1st argument is the remote file path and the 2nd is the BinData.  No decoding
//  or line-ending conversion is performed.

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;
}

//  The BinData is not cleared automatically, so clear it first for replacement behavior.
CkoBinData *bd = [[CkoBinData alloc] init];
success = [ftp GetFileBd: @"public_html/image.png" binData: bd];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

NSLog(@"%@%d%@",@"Downloaded ",[bd.NumBytes intValue],@" bytes into memory.");

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