Month: October 2015

Screen Size for iOS, Android and Windows Phone from C# with Xamarin in Shared Code.

To get the screen size from either iOS, Android, or Windows Phone you could use the following examples:

//ANDROID
int intHeight = (int)Resources.DisplayMetrics.HeightPixels / Resources.DisplayMetrics.Density;
int intWidth = (int)Resources.DisplayMetrics.WidthPixels / Resources.DisplayMetrics.Density;
 
//IOS
int intHeight = UIScreen.MainScreen.Bounds.Height; 
int intWidth = UIScreen.MainScreen.Bounds.Width;
 
//WINPHONE
int intHeight = Window.Current.Bounds.Height; 
int intWidth = Window.Current.Bounds.Width;

To get screen size from any one of the platforms in a shared code base you could include conditional compile directives as follows:

 
int intHeight = 0;
int intWidth = 0;
 
#if __ANDROID__
	intHeight = (int)Resources.DisplayMetrics.HeightPixels / Resources.DisplayMetrics.Density;
	intWidth = (int)Resources.DisplayMetrics.WidthPixels / Resources.DisplayMetrics.Density;
#end if 
 
#if __IOS___
	intHeight = UIScreen.MainScreen.Bounds.Height; 
	intWidth = UIScreen.MainScreen.Bounds.Width;
#endif
 
#if WINDOWS_PHONE_APP
	intHeight = Window.Current.Bounds.Height; 
	intWidth = Window.Current.Bounds.Width;
#endif

Making a cURL call to Metamind.io from C#

I had the need to make cURL calls from C# to a call several Metamind.io classifiers I built for an AI proof of concept project.  I struggled a bit getting the headers and syntax correct so I thought I’d share the result in hopes that it may help someone else with a similar need.  I found a few cURL wrappers for C# but found those to be heavy, complicated and unnecessary after much experimentation.

Although this example is specific to Metamind, I think the same general idea would work for any cURL call.

Here is the method that calls the service:

public async Task<string[]> CallCurlService(string strClassifierID, string strImagePath)
{
    string[] strRetval;
 
    var client = new HttpClient();
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", mstrCredentials);
 
    StringContent stringContent = new StringContent("{\"classifier_id\":" + strClassifierID + ",\"image_url\":\"" + strImagePath + "\"}");
    HttpResponseMessage response = await client.PostAsync(mstrMetamindUrl, stringContent);
 
    HttpContent responseContent = response.Content;// Get the response content.
 
    using (var reader = new StreamReader(await responseContent.ReadAsStreamAsync()))// Get the stream of the content.
    {
        JObject jsonResult = JObject.Parse(await reader.ReadToEndAsync());
        string strResult = jsonResult.ToString();
        string strCategory = jsonResult["predictions"].First["class_name"].ToString();
        string strProbability = Math.Round(((double)jsonResult["predictions"].First["prob"] * 100), 2).ToString() + "%";
        strRetval = new string[] { strCategory, strProbability };
    }
 
    return strRetval;
}