Tcl

Get GMail Message Metadata

See more GMail REST API Examples

Demonstrates how to get the metadata for each message in a list of message IDs. Tcl

load ./chilkat.dll

set success 0

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

set http [new_CkHttp]

CkHttp_put_AuthToken $http "ACCESS_TOKEN"

CkHttp_put_Accept $http "application/json"

# Let's say we have the following JSON containing a list of message ID's

# {
#   "messages": [
#     {
#       "id": "1712bc1dc22da2a2",
#       "threadId": "1712bc1dc22da2a2"
#     },
#     {
#       "id": "1712b94fa2168040",
#       "threadId": "1712b94fa2168040"
#     },
#     {
#       "id": "1711e4bd96ded05e",
#       "threadId": "1711e4bd96ded05e"
#     },
#     {
#       "id": "1711de0d119e751e",
#       "threadId": "1711de0d119e751e"
#     },
#     {
#       "id": "1711c81a43050f59",
#       "threadId": "1711c81a43050f59"
#     },
#     {
#       "id": "1711c2c1516abce5",
#       "threadId": "1711c2c1516abce5"
#     },
#     {
#       "id": "1711c161e655c915",
#       "threadId": "1711c161e655c915"
#     },
#     {
#       "id": "171199c6e454558c",
#       "threadId": "171199c6e454558c"
#     },
#     {
#       "id": "17119474c8aa248e",
#       "threadId": "17119474c8aa248e"
#     }
#   ],
#   "nextPageToken": "16710921492249671162",
#   "resultSizeEstimate": 309
# }

# Normally your program would have the above JSON in a string variable (obtained from a previous call to get
# a list of message IDs from a GMail mailbox).  In this example, we'll load the JSON from a file.
set jsonMsgIds [new_CkJsonObject]

set success [CkJsonObject_LoadFile $jsonMsgIds "qa_data/json/gmail_message_ids.json"]

set resp [new_CkHttpResponse]

set i 0
set count_i [CkJsonObject_SizeOfArray $jsonMsgIds "messages"]
while {$i < $count_i} {
    CkJsonObject_put_I $jsonMsgIds $i
    set id [CkJsonObject_stringOf $jsonMsgIds "messages[i].id"]

    # Get the metadata for this message ID.
    CkHttp_SetUrlVar $http "id" $id

    set success [CkHttp_HttpNoBody $http "GET" "https://www.googleapis.com/gmail/v1/users/userId/messages/{$id}?format=metadata" $resp]
    if {$success == 0} then {
        puts [CkHttp_lastErrorText $http]
        delete_CkHttp $http
        delete_CkJsonObject $jsonMsgIds
        delete_CkHttpResponse $resp
        exit
    }

    puts "Response Status Code: [CkHttpResponse_get_StatusCode $resp]"

    set jsonResponse [new_CkJsonObject]

    CkJsonObject_Load $jsonResponse [CkHttpResponse_bodyStr $resp]
    CkJsonObject_put_EmitCompact $jsonResponse 0
    puts [CkJsonObject_emit $jsonResponse]

    if {[CkHttpResponse_get_StatusCode $resp] != 200} then {
        puts "Failed."
        delete_CkHttp $http
        delete_CkJsonObject $jsonMsgIds
        delete_CkHttpResponse $resp
        delete_CkJsonObject $jsonResponse
        exit
    }

    set i [expr $i + 1]
}

# Use this online tool to generate parsing code from sample JSON: 
# Generate Parsing Code from JSON

delete_CkHttp $http
delete_CkJsonObject $jsonMsgIds
delete_CkHttpResponse $resp
delete_CkJsonObject $jsonResponse