/// <summary>
/// Asynchronously uploads the specified image to Google Images,
/// and returns the URL of the results page.
/// </summary>
/// <param name="imagePath">Path to the image file</param>
/// <param name="includeFileName">Whether to send the image file name to Google</param>
/// <param name="resizeOnUpload">Whether to resize large images</param>
/// <param name="cancelToken">Allows for cancellation of the upload</param>
/// <returns>String containing the URL of the results page</returns>
public static async Task <string> Search(string imagePath, bool includeFileName, bool resizeOnUpload, CancellationToken cancelToken)
{
// Load the image, resizing it if necessary
byte[] data = LoadImageData(imagePath, resizeOnUpload);
// Prevent auto redirect (we want to open the
// redirect destination directly in the browser)
var handler = new HttpClientHandler();
handler.AllowAutoRedirect = false;
using (var client = new HttpClient(handler))
{
var form = new MultipartFormDataContentCompat();
form.Add(new StringContent(BinaryToBase64Compat(data)), "image_content");
if (includeFileName)
{
form.Add(new StringContent(Path.GetFileName(imagePath)), "filename");
}
var response = await client.PostAsync("https://images.google.com/searchbyimage/upload", form, cancelToken);
if (response.StatusCode != HttpStatusCode.Redirect)
{
throw new IOException("Expected redirect to results page, got " + (int)response.StatusCode);
}
string resultUrl = response.Headers.Location.ToString();
return(resultUrl);
}
}
public async Task GoogleImageSearch(string imagePath, bool includeFileName, CancellationToken cancelToken)
{
if (memStream == null)
{
return;
}
byte[] data = memStream.ToArray();
// Prevent auto redirect (we want to open the
// redirect destination directly in the browser)
var handler = new HttpClientHandler();
handler.AllowAutoRedirect = false;
using (var client = new HttpClient(handler))
{
var form = new MultipartFormDataContentCompat();
form.Add(new StringContent(BinaryToBase64Compat(data)), "image_content");
if (includeFileName)
{
form.Add(new StringContent(Path.GetFileName(imagePath)), "filename");
}
var response = await client.PostAsync("https://images.google.com/searchbyimage/upload", form, cancelToken);
if (cancelToken.IsCancellationRequested)
{
return;
}
if (response.StatusCode != HttpStatusCode.Redirect)
{
MessageBox.Show("Expected redirect to results page, got " + (int)response.StatusCode);
return;
}
string resultUrl = response.Headers.Location.ToString();
TryOpenBrowser(resultUrl);
}
}
