Tcl

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. Tcl

load ./chilkat.dll

set success 0

# Azure File Service Example: Download a Binary File to Memory
# See:  https://docs.microsoft.com/en-us/rest/api/storageservices/get-file

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

set rest [new_CkRest]

# Connect to the Azure Storage Blob Service
set bTls 1
set port 443
set bAutoReconnect 1
# In this example, the storage account name is "chilkat".
set success [CkRest_Connect $rest "chilkat.file.core.windows.net" $port $bTls $bAutoReconnect]
if {$success == 0} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    exit
}

# Provide Azure Cloud credentials for the REST calls.
set azAuth [new_CkAuthAzureStorage]

CkAuthAzureStorage_put_AccessKey $azAuth "AZURE_ACCESS_KEY"
# The account name used here should match the 1st part of the domain passed in the call to Connect (above).
CkAuthAzureStorage_put_Account $azAuth "chilkat"
CkAuthAzureStorage_put_Scheme $azAuth "SharedKey"
CkAuthAzureStorage_put_Service $azAuth "File"
# This causes the "x-ms-version: 2021-08-06" header to be automatically added.
CkAuthAzureStorage_put_XMsVersion $azAuth "2021-08-06"
set success [CkRest_SetAuthAzureStorage $rest $azAuth]

# Note: The application does not need to explicitly set the following
# headers: x-ms-date, Authorization.  These headers
# are automatically set by Chilkat.

# Send a GET request to download the file "penguins.jpg" to a BinData object.
# (The share name is "pip")
set bdFileContents [new_CkBinData]

set success [CkRest_FullRequestNoBodyBd $rest "GET" "/pip/wildlife/antarctic/penguins.jpg" $bdFileContents]
if {$success == 0} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkAuthAzureStorage $azAuth
    delete_CkBinData $bdFileContents
    exit
}

# When successful, the response status will be 200.
# If a non-success status code is returned, then the bdFileContents actually contains the XML error message.
if {[CkRest_get_ResponseStatusCode $rest] != 200} then {
    # Examine the request/response to see what happened.
    puts "response status code = [CkRest_get_ResponseStatusCode $rest]"
    puts "response status text = [CkRest_responseStatusText $rest]"
    puts "response header: [CkRest_responseHeader $rest]"
    set sbXmlErr [new_CkStringBuilder]

    CkStringBuilder_AppendBd $sbXmlErr $bdFileContents "utf-8" 0 0
    puts "response body (if any): [CkStringBuilder_getAsString $sbXmlErr]"
    puts "---"
    puts "LastRequestStartLine: [CkRest_lastRequestStartLine $rest]"
    puts "LastRequestHeader: [CkRest_lastRequestHeader $rest]"
    delete_CkRest $rest
    delete_CkAuthAzureStorage $azAuth
    delete_CkBinData $bdFileContents
    delete_CkStringBuilder $sbXmlErr
    exit
}

puts "Size of the downloaded file = [CkBinData_get_NumBytes $bdFileContents]"

# See the online reference documentation for the BinData class for ways
# to access the bytes.

CkBinData_WriteFile $bdFileContents "qa_output/penguins.jpg"

delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkBinData $bdFileContents
delete_CkStringBuilder $sbXmlErr