(Tcl) HTTP multipart/form-data Upload

Demonstrates how to upload files to an HTTP server using a multipart/form-data POST.

Chilkat Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set http [new_CkHttp]

set req [new_CkHttpRequest]

CkHttpRequest_put_HttpVerb $req "POST"
CkHttpRequest_put_ContentType $req "multipart/form-data"
CkHttpRequest_put_Path $req "rcvFormDataUpload.aspx"

# Send an "Expect: 100-continue" header in the request.
# This causes the HTTP server to end a 100-continue response
# immediately after receiving the HTTP header.  The client
# (Chilkat) will receive this intermediate response, and if
# it's not an error response, it knows that the HTTP server will
# accept the data that is forthcoming.
# The alternative is to get an error response after trying to upload
# the entire contents of the files.
CkHttpRequest_AddHeader $req "Expect" "100-continue"

# Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST
# To allow Chilkat to determine the content-type automatically based on file-extension,
# call AddFileForUpload instead.

# The 1st arg is the filename passed in the HTTP request.
# The 2nd arg is the path in the local filesytem.
# The file is not loaded into memory.  It is streamed directly from the file
# when the HTTP POST is sent.
set success [CkHttpRequest_AddFileForUpload2 $req "starfish.jpg" "c:/qa_data/starfish.jpg" "image/jpg"]
if {$success != 1} then {
    puts [CkHttpRequest_lastErrorText $req]
    delete_CkHttp $http
    delete_CkHttpRequest $req
    exit
}

set success [CkHttpRequest_AddFileForUpload $req "something.pdf" "c:/qa_data/something.pdf"]
if {$success != 1} then {
    puts [CkHttpRequest_lastErrorText $req]
    delete_CkHttp $http
    delete_CkHttpRequest $req
    exit
}

# Its also possible to add a file from a string:
set success [CkHttpRequest_AddStringForUpload $req "test.xml" "test.xml" "<abc>This is the test.xml content</abc>" "utf-8"]
# We'll assume success since no files are involved..

# This sends the HTTP request (with 3 files being uploaded) to
# http://www.mywebserver123abc.com/rcvFormDataUpload.aspx
# resp is a CkHttpResponse

set resp [CkHttp_SynchronousRequest $http "www.mywebserver123abc.com" 80 0 $req]
if {[CkHttp_get_LastMethodSuccess $http] != 1} then {
    puts [CkHttp_lastErrorText $http]
} else {
    puts "HTTP response status: [CkHttpResponse_get_StatusCode $resp]"
    # See the online reference documentation for 
    # other information that can be obtained from the response object.
    delete_CkHttpResponse $resp

}

# To send using SSL/TLS, do this instead.
# This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx
set resp [CkHttp_SynchronousRequest $http "www.mywebserver123abc.com" 443 1 $req]
if {[CkHttp_get_LastMethodSuccess $http] != 1} then {
    puts [CkHttp_lastErrorText $http]
} else {
    puts "HTTP response status: [CkHttpResponse_get_StatusCode $resp]"
    # See the online reference documentation for 
    # other information that can be obtained from the response object.
    delete_CkHttpResponse $resp

}


delete_CkHttp $http
delete_CkHttpRequest $req