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

Excel Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
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

 

 

 

(Excel) Receive Text until CRLF

Demonstrates receiving text on a socket connection up to and including when an expected CRLF arrives. The example sends an HTTP HEAD request to an HTTP server and then reads the response header using ReceiveToCRLF and ReceiveUntilMatch.

Download Excel Class Modules

Chilkat Excel Class Modules

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

Dim socket As Chilkat.Socket
Set socket = Chilkat.NewSocket

' Connect using TLS to www.chilkatsoft.com
' We could also use a normal TCP connection also by specifying port 80 with useTls = False.

useTls = True

maxWaitMillisec = 20000

success = socket.Connect("www.chilkatsoft.com",443,useTls,maxWaitMillisec)
If (success <> True) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

' Tell the socket object that all text is to be sent in the utf-8 encoding,
' and the text received is assumed to be utf-8.
socket.StringCharset = "utf-8"

' Send an HTTP HEAD request:
success = socket.SendString("HEAD / HTTP/1.1" & vbCrLf & "Host: www.chilkatsoft.com" & vbCrLf & vbCrLf)
If (success <> True) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

' Wait a maximum of 4 seconds while no data is forthcoming:
socket.MaxReadIdleMs = 4000

' To explain MaxReadIdleMs further:  In Chilkat, a max "idle timeout" is the max time to wait
' while no additional data arrives on the socket.  Imagine if 10MB of data will be received
' where the 1st CRLF occurs at the very end.  As long as the data continues arriving and does not
' halt for more than 4000ms, then the ReceiveToCRLF will continue receiving.  It is only after
' the connection becomes idle for more than 4000ms that the app will giveup and fail the read.

' Get the 1st response line, which should be "HTTP/1.1 200 OK"

responseStatusLine = socket.ReceiveToCRLF()
If (socket.LastMethodSuccess <> True) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

Debug.Print "StatusLine: "; responseStatusLine

' Now get the 1st line of the response header:

responseHeaderLine = socket.ReceiveToCRLF()
If (socket.LastMethodSuccess <> True) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

Debug.Print "HeaderLine: "; responseHeaderLine

' Now read the remainder of the response header by reading until a double CRLF is seen:

remainderOfHeader = socket.ReceiveUntilMatch(vbCrLf & vbCrLf)
If (socket.LastMethodSuccess <> True) Then
    Debug.Print socket.LastErrorText
    Exit Sub
End If

Debug.Print "Remainder: "; remainderOfHeader

' Close the connection with the server
' Wait a max of 20 seconds (20000 millsec)
success = socket.Close(20000)

 

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