PureBasic

Google Drive - Upload File

See more Google Drive Examples

This example demonstrates how to upload a file to Google Drive. The assumption is that the file can be loaded into memory and uploaded. It is also possible to stream large files to Google Drive, but the code required is a little more complex. PureBasic

IncludeFile "CkBinData.pb"
IncludeFile "CkAuthGoogle.pb"
IncludeFile "CkRest.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkJsonArray.pb"

Procedure ChilkatExample()

    success.i = 0

    success = 1

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

    ; This example uses a previously obtained access token having permission for the 
    ; Google Drive scope. 
    ; See Get Google Drive OAuth2 Access Token

    gAuth.i = CkAuthGoogle::ckCreate()
    If gAuth.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkAuthGoogle::setCkAccessToken(gAuth, "GOOGLE_DRIVE_ACCESS_TOKEN")

    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect using TLS.
    bAutoReconnect.i = 1
    success = CkRest::ckConnect(rest,"www.googleapis.com",443,1,bAutoReconnect)

    ; Provide the authentication credentials (i.e. the access token)
    CkRest::ckSetAuthGoogle(rest,gAuth)

    ; -------------------------------------------------------------------------
    ; A multipart upload to Google Drive needs a multipart/related Content-Type
    CkRest::ckAddHeader(rest,"Content-Type","multipart/related")

    ; Specify each part of the request.

    ; The 1st part is JSON with information about the file.
    CkRest::setCkPartSelector(rest, "1")
    CkRest::ckAddHeader(rest,"Content-Type","application/json; charset=UTF-8")

    ; Construct the JSON that will contain the metadata about the file data to be uploaded...
    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckAppendString(json,"name","starfish.jpg")
    CkJsonObject::ckAppendString(json,"description","A picture of a starfish.")
    CkJsonObject::ckAppendString(json,"mimeType","image/jpeg")

    ; To place the file in a folder, we must add a parents[] array to the JSON
    ; and add the folder ID.  
    ; In a previous example (see Lookup Google Drive Folder ID
    ; we showed how to find the folder ID for a folder in Google Drive.

    ; Use the folder ID we already looked up..
    folderId.s = "1Fksv-TfA1ILii1YjXsNa1-rDu8Cdrg72"

    parents.i = CkJsonArray::ckCreate()
    If parents.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckAppendArray2(json,"parents",parents)

    CkJsonArray::ckAddStringAt(parents,-1,folderId)

    CkRest::ckSetMultipartBodyString(rest,CkJsonObject::ckEmit(json))

    ; The 2nd part is the file content, which will contain the binary image data.
    CkRest::setCkPartSelector(rest, "2")
    CkRest::ckAddHeader(rest,"Content-Type","image/jpeg")

    jpgBytes.i = CkBinData::ckCreate()
    If jpgBytes.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkBinData::ckLoadFile(jpgBytes,"qa_data/jpg/starfish.jpg")

    ; Add the data to our upload
    CkRest::ckSetMultipartBodyBd(rest,jpgBytes)

    jsonResponse.s = CkRest::ckFullRequestMultipart(rest,"POST","/upload/drive/v3/files?uploadType=multipart")
    If CkRest::ckLastMethodSuccess(rest) = 0
        Debug CkRest::ckLastErrorText(rest)
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkJsonObject::ckDispose(json)
        CkJsonArray::ckDispose(parents)
        CkBinData::ckDispose(jpgBytes)
        ProcedureReturn
    EndIf

    ; A successful response will have a status code equal to 200.
    If CkRest::ckResponseStatusCode(rest) <> 200
        Debug "response status code = " + Str(CkRest::ckResponseStatusCode(rest))
        Debug "response status text = " + CkRest::ckResponseStatusText(rest)
        Debug "response header: " + CkRest::ckResponseHeader(rest)
        Debug "response JSON: " + jsonResponse
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkJsonObject::ckDispose(json)
        CkJsonArray::ckDispose(parents)
        CkBinData::ckDispose(jpgBytes)
        ProcedureReturn
    EndIf

    CkJsonObject::ckLoad(json,jsonResponse)

    ; Show the full JSON response.
    CkJsonObject::setCkEmitCompact(json, 0)
    Debug CkJsonObject::ckEmit(json)

    ; A successful response looks like this:
    ; {
    ;   "kind": "drive#file",
    ;   "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
    ;   "name": "starfish.jpg",
    ;   "mimeType": "image/jpeg"
    ; }

    ; Get the fileId:
    Debug "fileId: " + CkJsonObject::ckStringOf(json,"id")


    CkAuthGoogle::ckDispose(gAuth)
    CkRest::ckDispose(rest)
    CkJsonObject::ckDispose(json)
    CkJsonArray::ckDispose(parents)
    CkBinData::ckDispose(jpgBytes)


    ProcedureReturn
EndProcedure