Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

MFC Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(MFC) Bidirectional Sockets (TLS or non-TLS, simultaneous reading and writing a connection)

This example demonstrates how to simultaneously read/write on a single socket connection.

Chilkat C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkSocket.h>
#include <CkTask.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkSocket tlsRead;

    // We'll just use an HTTPS server for this example...
    bool bUseTls = true;
    int maxWaitMs = 5000;
    bool success = tlsRead.Connect("www.chilkatsoft.com",443,bUseTls,maxWaitMs);
    if (success != true) {
        strOut.append(tlsRead.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Chilkat classes are thread-safe.  This means that only one method call can be active
    // at a time for a given object instance.  It would seem that this would prevent the possibility
    // to simultaneously read/write a given connection because it would require two method calls
    // to be simultaneously active: one for reading and one for writing.
    // 
    // There's a trick to doing it...
    // 
    // The CloneSocket method is provided to get a new object instance that shares the same socket
    // connection.  This allows for the coarse-grained object-level thread safety to be maintained, 
    // while finer-grained thread-safety mechanisms keep things kosher internally.

    // One object will be used for reading, and the cloned socket is used for writing.
    // It doesn't matter which --  you can use the cloned socket for reading or the original for writing.
    // However.. if you try to read simultneously from both the original and cloned objects at the same
    // time, then one will block until the other finishes.  (This is because of the finer-grained thread
    // safety internally.)  The same is true if you try to write both socket objects simultaneously.

    CkSocket *tlsWrite = tlsRead.CloneSocket();

    // Let's start an async read on the socket.  Nothing will be arriving until we actually send the GET
    // request and the server responds.  This will read until the end of the HTTP response header.
    CkTask *task = tlsRead.ReceiveUntilMatchAsync("\r\n\r\n");
    task->Run();

    // Now send the request.  This should not block because the read is happening on the tlsRead object.
    const char *httpGetReq = "GET / HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n";
    success = tlsWrite->SendString(httpGetReq);
    // Assuming success for the example...

    // Wait for the read task to finish.
    // The true/false returned by Wait applies to the Wait method call, not the task.
    maxWaitMs = 5000;
    success = task->Wait(maxWaitMs);
    if (!success || (task->get_StatusInt() != 7) || (task->get_TaskSuccess() != true)) {
        if (!success) {
            // The task.LastErrorText applies to the Wait method call.
            strOut.append(task->lastErrorText());
            strOut.append("\r\n");
        }
        else {
            // The ResultErrorText applies to the underlying task method call (i.e. the Connect)
            strOut.append(task->status());
            strOut.append("\r\n");
            strOut.append(task->resultErrorText());
            strOut.append("\r\n");
        }

        delete task;
        delete tlsWrite;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Examine the received HTTP response header:
    strOut.append("HTTP response header:");
    strOut.append("\r\n");
    strOut.append(task->getResultString());
    strOut.append("\r\n");

    // We should get a response that looks like this:
    // 	HTTP response header:
    // 	HTTP/1.1 200 OK
    // 	Cache-Control: private
    // 	Content-Length: 7477
    // 	Content-Type: text/html
    // 	Server: Microsoft-IIS/8.5
    // 	Set-Cookie: ASPSESSIONIDSWDSTRTQ=BBNMIKGCHFJNILFFPLDIOGDE; secure; path=/
    // 	X-Powered-By: ASP.NET
    // 	X-Powered-By-Plesk: PleskWin
    // 	Date: Thu, 06 Apr 2017 12:03:30 GMT

    delete task;
    delete tlsWrite;

    // Forget about the remainder of the HTTP response... The example was only to demonstrate
    // simultaneous reading/writing..
    maxWaitMs = 20;
    tlsRead.Close(maxWaitMs);


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.