Tcl Requires Chilkat v11.7.0+
Box: Search Files with Offset Pagination

Run the reusable setup once per HttpCurl object, then select names and execute the operation. The setup is repeated here only to make this published example independently runnable. Search within a folder hierarchy. Box search is indexed and may lag recent changes; use returned upload IDs for immediate follow-up requests. Search uses offset pagination, not folder-list markers.
See the Box API guide for setup and the complete workflow.
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load ./chilkat.dll

set success 0

#  Requires Chilkat 11.7.0 or later and a previously unlocked Chilkat bundle.
#  See Global Unlock Sample.
#  Guide: Box API Guide.

set success 0

#  BEGIN ONE-TIME SETUP
#  This block is repeated so each published example can run on its own.
#  In an application, run the setup example once and pass the SAME curl object
#  to operation code below. Do not recreate it for every operation.
#  See Reusable Box HttpCurl Setup.
set curl [new_CkHttpCurl]

CkHttpCurl_SetVar $curl "access_token" "BOX_ACCESS_TOKEN"
CkHttpCurl_SetVar $curl "parent_name" "/"
#  Box's fixed root ID is an implementation detail; callers supply names.
CkHttpCurl_SetVar $curl "parent_id" "0"
set setupCommand [new_CkStringBuilder]

#  Register findParent; registration sends no request.
CkStringBuilder_SetString $setupCommand "curl -X GET \"https://api.box.com/2.0/folders/0/items?limit=1000&fields=id,type,name\" -H \"Authorization: Bearer ACCESS_TOKEN\""
set setupReplacements [CkStringBuilder_Replace $setupCommand "ACCESS_TOKEN" [CkHttpCurl_getVar $curl "access_token"]]
set success [CkHttpCurl_AddFunction $curl "findParent" [CkStringBuilder_getAsString $setupCommand]]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

#  Register findFolder; registration sends no request.
CkStringBuilder_SetString $setupCommand "curl -X GET \"https://api.box.com/2.0/folders/{{parent_id}}/items?limit=1000&fields=id,type,name\" -H \"Authorization: Bearer ACCESS_TOKEN\""
set setupReplacements [CkStringBuilder_Replace $setupCommand "ACCESS_TOKEN" [CkHttpCurl_getVar $curl "access_token"]]
set success [CkHttpCurl_AddFunction $curl "findFolder" [CkStringBuilder_getAsString $setupCommand]]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

#  Register findFile; registration sends no request.
CkStringBuilder_SetString $setupCommand "curl -X GET \"https://api.box.com/2.0/folders/{{folder_id}}/items?limit=1000&fields=id,type,name\" -H \"Authorization: Bearer ACCESS_TOKEN\""
set setupReplacements [CkStringBuilder_Replace $setupCommand "ACCESS_TOKEN" [CkHttpCurl_getVar $curl "access_token"]]
set success [CkHttpCurl_AddFunction $curl "findFile" [CkStringBuilder_getAsString $setupCommand]]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

#  Register findDestination; registration sends no request.
CkStringBuilder_SetString $setupCommand "curl -X GET \"https://api.box.com/2.0/folders/0/items?limit=1000&fields=id,type,name\" -H \"Authorization: Bearer ACCESS_TOKEN\""
set setupReplacements [CkStringBuilder_Replace $setupCommand "ACCESS_TOKEN" [CkHttpCurl_getVar $curl "access_token"]]
set success [CkHttpCurl_AddFunction $curl "findDestination" [CkStringBuilder_getAsString $setupCommand]]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

#  Register getFileDetails; registration sends no request.
CkStringBuilder_SetString $setupCommand "curl -X GET \"https://api.box.com/2.0/files/{{file_id}}?fields=id,sha1,file_version\" -H \"Authorization: Bearer ACCESS_TOKEN\""
set setupReplacements [CkStringBuilder_Replace $setupCommand "ACCESS_TOKEN" [CkHttpCurl_getVar $curl "access_token"]]
set success [CkHttpCurl_AddFunction $curl "getFileDetails" [CkStringBuilder_getAsString $setupCommand]]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

#  Register getEnterprise; registration sends no request.
CkStringBuilder_SetString $setupCommand "curl -X GET \"https://api.box.com/2.0/users/me?fields=enterprise\" -H \"Authorization: Bearer ACCESS_TOKEN\""
set setupReplacements [CkStringBuilder_Replace $setupCommand "ACCESS_TOKEN" [CkHttpCurl_getVar $curl "access_token"]]
set success [CkHttpCurl_AddFunction $curl "getEnterprise" [CkStringBuilder_getAsString $setupCommand]]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

#  Register output rules once. Chilkat 11.7.0 evaluates {{name}} variables
#  when extracting each output, using the current value at that time.
set success [CkHttpCurl_AddOutput2 $curl "findParent" "entries" "name" "{{parent_name}}" 1 "id" "parent_id"]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

set success [CkHttpCurl_AddOutput2 $curl "findFolder" "entries" "name" "{{folder_name}}" 1 "id" "folder_id"]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

set success [CkHttpCurl_AddOutput2 $curl "findFile" "entries" "name" "{{file_name}}" 1 "id" "file_id"]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

set success [CkHttpCurl_AddOutput2 $curl "findDestination" "entries" "name" "{{destination_name}}" 1 "id" "destination_id"]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

set success [CkHttpCurl_AddOutput $curl "getFileDetails" "file_version.id" "file_version_id"]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

set success [CkHttpCurl_AddOutput $curl "getFileDetails" "sha1" "file_sha1"]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

set success [CkHttpCurl_AddOutput $curl "getEnterprise" "enterprise.id" "enterprise_id"]
if {$success != 1} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkHttpCurl $curl
    delete_CkStringBuilder $setupCommand
    exit
}

#  END ONE-TIME SETUP
#  The name lookups below assume each listing fits in one page (1000 items).
#  Parent and destination names select root children; folder_name selects a child
#  of parent_name. "/" selects the root parent. These are not arbitrary paths.

#  BEGIN OPERATION -- keep the configured object when reusing it.
#  Inputs are names. Retain cached IDs when the selected names have not changed.
set parentName "/"
set folderName "images"
if {expr [[CkHttpCurl_getVar $curl "parent_name"] != $parentName]  ||  [expr [$parentName == "/"]  &&  [[CkHttpCurl_VarDefined $curl "parent_id"] == 0]]} then {
    CkHttpCurl_SetVar $curl "parent_name" $parentName
    CkHttpCurl_ClearVar $curl "parent_id"
    CkHttpCurl_ClearVar $curl "folder_id"
    CkHttpCurl_ClearVar $curl "file_id"
    CkHttpCurl_ClearVar $curl "file_version_id"
    CkHttpCurl_ClearVar $curl "file_sha1"
    if {$parentName == "/"} then {
        CkHttpCurl_SetVar $curl "parent_id" "0"
    }

}

if {[CkHttpCurl_getVar $curl "folder_name"] != $folderName} then {
    CkHttpCurl_SetVar $curl "folder_name" $folderName
    CkHttpCurl_ClearVar $curl "folder_id"
    CkHttpCurl_ClearVar $curl "file_id"
    CkHttpCurl_ClearVar $curl "file_version_id"
    CkHttpCurl_ClearVar $curl "file_sha1"
}

CkHttpCurl_SetVar $curl "query" "penguins"
set page [new_CkJsonObject]

set number [new_CkStringBuilder]

set offset 0

set more 1
while {$more == 1} {
    CkStringBuilder_Clear $number
    CkStringBuilder_AppendInt $number $offset
    CkHttpCurl_SetVar $curl "offset" [CkStringBuilder_getAsString $number]
    CkHttpCurl_ClearTargetOutput $curl "*"
    set authorizedCommand1 [new_CkStringBuilder]

    CkStringBuilder_SetString $authorizedCommand1 "curl -X GET \"https://api.box.com/2.0/search?query={{query}}&type=file&ancestor_folder_ids={{folder_id}}&content_types=name&limit=100&offset={{offset}}\" -H \"Authorization: Bearer {{access_token}}\""
    set headerReplacement1 [CkStringBuilder_Replace $authorizedCommand1 "{{access_token}}" [CkHttpCurl_getVar $curl "access_token"]]
    set success [CkHttpCurl_DoYourThing $curl [CkStringBuilder_getAsString $authorizedCommand1]]
    if {expr [$success != 1]  ||  [[CkHttpCurl_get_StatusCode $curl] != 200]} then {
        puts "Box request failed. HTTP status: [CkHttpCurl_get_StatusCode $curl]"
        puts "Failure reason: [CkHttpCurl_get_FailReason $curl]"
        puts [CkHttpCurl_responseBodyStr $curl]
        delete_CkHttpCurl $curl
        delete_CkStringBuilder $setupCommand
        delete_CkJsonObject $page
        delete_CkStringBuilder $number
        delete_CkStringBuilder $authorizedCommand1
        exit
    }

    set success [CkHttpCurl_GetResponseJson $curl $page]
    if {$success != 1} then {
        puts [CkHttpCurl_lastErrorText $curl]
        delete_CkHttpCurl $curl
        delete_CkStringBuilder $setupCommand
        delete_CkJsonObject $page
        delete_CkStringBuilder $number
        delete_CkStringBuilder $authorizedCommand1
        exit
    }

    set count [CkJsonObject_SizeOfArray $page "entries"]
    set i 0
    while {$i < $count} {
        CkJsonObject_put_I $page $i
        puts [CkJsonObject_stringOf $page {entries[i].id}] [CkJsonObject_stringOf $page {entries[i].name}]
        set i [expr $i + 1]
    }
    set pageLimit [CkJsonObject_IntOf $page "limit"]
    set total [CkJsonObject_IntOf $page "total_count"]
    if {$pageLimit <= 0} then {
        puts "Missing or invalid search page limit."
        delete_CkHttpCurl $curl
        delete_CkStringBuilder $setupCommand
        delete_CkJsonObject $page
        delete_CkStringBuilder $number
        delete_CkStringBuilder $authorizedCommand1
        exit
    }

    set offset [expr $offset + $pageLimit]
    set more [expr [$offset < $total]  &&  [$count > 0]]
    if {expr [$more == 1]  &&  [$offset > 9999]} then {
        puts "Search offset limit reached; narrow the query or folder scope."
        delete_CkHttpCurl $curl
        delete_CkStringBuilder $setupCommand
        delete_CkJsonObject $page
        delete_CkStringBuilder $number
        delete_CkStringBuilder $authorizedCommand1
        exit
    }

}

delete_CkHttpCurl $curl
delete_CkStringBuilder $setupCommand
delete_CkJsonObject $page
delete_CkStringBuilder $number
delete_CkStringBuilder $authorizedCommand1