(Objective-C) Co:Z SFTP Binary File Download (from z/OS IBM Mainframe)

Demonstrates how to download a binary file, such as a .zip, from a Co:Z SFTP server on a z/OS IBM Mainframe.

Note: This requires Chilkat v9.5.0.76 or greater.

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#import <CkoSFtp.h>
#import <NSString.h>
#import <CkoSFtpDir.h>

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

CkoSFtp *sftp = [[CkoSFtp alloc] init];

// Connect to the SSH server.  
NSString *hostname = @"sftp.example.com";
int port = 22;
BOOL success = [sftp Connect: hostname port: [NSNumber numberWithInt: port]];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

success = [sftp AuthenticatePw: @"myLogin" password: @"myPassword"];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

success = [sftp InitializeSftp];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// To download a binary file from the Co:Z SFTP server, 
// we must switch to binary mode in the following unconventional way.
// We pretend to fetch a directory listing for "/+mode=binary"
// This has the effect of putting the server in binary mode for transfers.
NSString *handle = [sftp OpenDir: @"/+mode=binary"];
if (sftp.LastMethodSuccess != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Download the "directory listing" (but it's not actually a directory listing, and we'll just discard it.)
CkoSFtpDir *dirListing = [sftp ReadDir: handle];
if (sftp.LastMethodSuccess != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Close the directory handle:
success = [sftp CloseHandle: handle];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Download the binary file:
NSString *localFilePath = @"c:/temp/test.zip";
NSString *remoteFilePath = @"test.zip";
success = [sftp DownloadFileByName: remoteFilePath localFilePath: localFilePath];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");