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C# UWP/WinRT Examples

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(C# UWP/WinRT) Search for Files in Google Drive

This example follows the same methodology for listing all files in Google Drive in pages, but applies a search filter. It shows how to apply a query parameter for filtering the file results. See the Google Drive Files list for more optional HTTP parameters.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

bool success = true;

//  It 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.

Chilkat.AuthGoogle gAuth = new Chilkat.AuthGoogle();
gAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN";

Chilkat.Rest rest = new Chilkat.Rest();

//  Connect using TLS.
bool bAutoReconnect = true;
success = await rest.ConnectAsync("www.googleapis.com",443,true,bAutoReconnect);

//  Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth);

//  Get 5 results per page for testing.  (The default page size is 100, with a max of 1000.
rest.AddQueryParam("pageSize","5");

//  Our search filter is to list all files containing ".jpg" (i.e. all JPG image files)
rest.AddQueryParam("q","name contains '.jpg'");

Chilkat.JsonObject json = new Chilkat.JsonObject();
int i;
int numFiles;

//  Send the request for the 1st page.
string jsonResponse = await rest.FullRequestNoBodyAsync("GET","/drive/v3/files");

int pageNumber = 1;
string pageToken;
bool bContinueLoop = rest.LastMethodSuccess && (rest.ResponseStatusCode == 200);

while (bContinueLoop == true) {

    Debug.WriteLine("---- Page " + Convert.ToString(pageNumber) + " ----");

    //  Iterate over each file in the response and show the name, id, and mimeType.
    json.Load(jsonResponse);

    numFiles = json.SizeOfArray("files");
    i = 0;
    while (i < numFiles) {
        json.I = i;
        Debug.WriteLine("name: " + json.StringOf("files[i].name"));
        Debug.WriteLine("id: " + json.StringOf("files[i].id"));
        Debug.WriteLine("mimeType: " + json.StringOf("files[i].mimeType"));
        Debug.WriteLine("-");
        i = i + 1;
    }

    //  Get the next page of files.
    //  If the "nextPageToken" is present in the JSON response, then use it in the "pageToken" parameter
    //  for the next request.   If no "nextPageToken" was present, then this was the last page of files.
    pageToken = json.StringOf("nextPageToken");
    bContinueLoop = false;
    bool bHasMorePages = json.LastMethodSuccess;
    if (bHasMorePages == true) {
        rest.ClearAllQueryParams();
        rest.AddQueryParam("pageSize","5");
        rest.AddQueryParam("pageToken",pageToken);
        rest.AddQueryParam("q","name contains '.jpg'");

        jsonResponse = await rest.FullRequestNoBodyAsync("GET","/drive/v3/files");
        bContinueLoop = rest.LastMethodSuccess && (rest.ResponseStatusCode == 200);
        pageNumber = pageNumber + 1;
    }

}

if (rest.LastMethodSuccess != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

//  A successful response will have a status code equal to 200.
if (rest.ResponseStatusCode != 200) {
    Debug.WriteLine("response status code = " + Convert.ToString(rest.ResponseStatusCode));
    Debug.WriteLine("response status text = " + rest.ResponseStatusText);
    Debug.WriteLine("response header: " + rest.ResponseHeader);
    Debug.WriteLine("response JSON: " + jsonResponse);
    return;
}


 

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