C#

BatchModify - Add a Label to each Message in Search Results

See more GMail REST API Examples

Searchs GMail for messages meeting a criteria and adds a label to each message found. C#

bool success = false;

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

Chilkat.Http http = new Chilkat.Http();
http.AuthToken = "GMAIL-ACCESS-TOKEN";

string userId = "me";
http.SetUrlVar("userId",userId);

string query = "subject:questions";
http.SetUrlVar("query",query);

string url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages?q={$query}";

Chilkat.StringBuilder sb = new Chilkat.StringBuilder();
success = http.QuickGetSb(url,sb);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.LoadSb(sb);
json.EmitCompact = false;
Debug.WriteLine(json.Emit());

if (http.LastStatus != 200) {
    Debug.WriteLine("Failed.");
    return;
}

//  If successful, the received JSON looks like this:
//  {
//    "messages": [
//      {
//        "id": "166f583051d36144",
//        "threadId": "166f583051d36144"
//      },
//      {
//        "id": "166f5815e1f36144",
//        "threadId": "166f5815e1f36144"
//      },
//  	...
//      {
//        "id": "166f580639e36144",
//        "threadId": "166f580639e36144"
//      },
//      {
//        "id": "15dbc2e28ec789c6",
//        "threadId": "15dbc2e28ec789c6"
//      }
//    ],
//    "nextPageToken": "13434766102274844688",
//    "resultSizeEstimate": 103
//  }
//  

//  Next, we'll be sending an HTTP POST to add the label "questions" to each message in the
//  search results.  The JSON to be sent for the batchModify is this:

//  	{
//  	  "ids": [
//  	    string
//  	  ],
//  	  "addLabelIds": [
//  	    string
//  	  ],
//  	  "removeLabelIds": [
//  	    string
//  	  ]
//  	}

//  We'll omit "removeLabelIds" because we're not removing any labels.
//  We are parsing the JSON search results, and at the same time building the batchModify JSON.

Chilkat.JsonObject json2 = new Chilkat.JsonObject();

int i = 0;
int numMessages = json.SizeOfArray("messages");
while ((i < numMessages)) {
    json.I = i;
    string id = json.StringOf("messages[i].id");
    json2.I = i;
    json2.UpdateString("ids[i]",id);
    i = i + 1;
}

//  We need the id of the label (not the name).
//  I know the name of the label is "questions", but I need to know the id.
//  See this example: Get Label Id by Name
//  The id of my label named "questions" is "Label_43"
string labelId = "Label_43";
json2.UpdateString("addLabelIds[0]",labelId);
json2.UpdateNewArray("removeLabelIds");

json2.EmitCompact = false;
Debug.WriteLine(json2.Emit());

//  Send the batchModify
url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/batchModify";
Chilkat.HttpResponse resp = new Chilkat.HttpResponse();
success = http.HttpJson("POST",url,json2,"application/json",resp);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("status = " + Convert.ToString(resp.StatusCode));

//  A 204 response status indicate success.
if (resp.StatusCode != 204) {
    Debug.WriteLine(resp.BodyStr);
    Debug.WriteLine("Failed.");
    return;
}

//  The 204 response has an empty response body..

Debug.WriteLine("BatchModify success!");