I was very excited to try out the new feature in VS 2012 ultimate that allows you to run whole load tests with coded web tests.
Unfortunatly, I've ran into a bit of a problem. While trying to debug a web test I've generated (and edited afterwards), I keep getting an NullReferenceException on a simple declaration line. I simply cannot wrap my head around why this occurs. Here's the code:
[Priority(0)]
public class CreateSessionCoded : WebTest
{
public string[] SessionID;
public string[] SessionTime;
public string[] CreatedTime;
public CreateSessionCoded()
{
this.Context.Add("Parameter1", "");
this.PreAuthenticate = true;
}
public override IEnumerator<WebTestRequest> GetRequestEnumerator()
{
//string CurrentITR = this.Context.WebTestIteration.ToString();
SessionID[this.Context.WebTestIteration] = Guid.NewGuid().ToString();
SessionTime[this.Context.WebTestIteration] = System.DateTime.UtcNow.ToString();
CreatedTime[this.Context.WebTestIteration] = System.DateTime.Now.ToString();
...
The code goes on, but the part where I get the NRE is at the last two lines where I try to assign values to my SessionTime and CreatedTime parameters.
It doesn't happen when assigning to the SessionID, so it's not about the WebTestIteration in any way. It also happens if I try to assign a different string (any casual string such as, say, "blabla") to the same parameters.
I'd really appreciate any help! Thanks in advance! :)
You define three arrays:
public string[] SessionID;
public string[] SessionTime;
public string[] CreatedTime;
But, they aren't initialized before you attempt to use them.
Basically, you are doing this:
string[] foo;
foo[1] = "bar";
And you need to do this:
string[] foo = new string[10]; // sized appropriately
foo[1] = "bar";
Related
In my properties, I have several bools called Username, Frames, Time, and Rerecords. Also, there is a string called StringFormat. I will explain further in a moment.
I have an object called User with variables(is this the right word?) User.Username, User.Frames, User.Time, User.Rerecords. Each variable is a string, int, int, int respectively.
Finally, I have a method:
public void Display(string stringFormat, params object[] args)
{
// stringFormat = Properties.Settings.Default.Format
lbl_Display.Text = string.Format(stringFormat, args);
}
I wish uses the User variables as the args IF the property variables of the same names are True.
How can I do this? Currently, my research has lead me here, but it hasn't been of any help.
Any help would be greatly appreciated. Thank you.
Edit:
I did it with some spaghetti code, to simulate the response:
public void Display()
{
// spaghetti code - Fix later
NumberConverter nc = new NumberConverter();
List<bool> settings = new List<bool>
{
Properties.Settings.Default.Username,
Properties.Settings.Default.Frames,
Properties.Settings.Default.Time,
Properties.Settings.Default.Rerecords
};
List<string> args = new List<string> { };
if (settings[0])
args.Add(compList[listIndex].Username);
if (settings[1])
args.Add(compList[listIndex].Frames.ToString());
if (settings[2])
args.Add(nc.FormatTime(compList[listIndex].Frames));
if (settings[3])
args.Add(compList[listIndex].Rerecords.ToString());
lbl_Display.Text = string.Format(Properties.Settings.Default.Format, args.Cast<object>().ToArray());
}
I'm trying to build a PostScript to PDF Converter using Ghostscript.Net.
The Args that GetArgs return, are the ones I usually use to call gswin32c.exe and they work fine.
But every time i call Process, i get an error Saying "An error occured when call to 'gsapi_init_with_args' is made: -100". Googling that error didn't bring anything up so I thought I might ask here.
Are there differnet arguments to consider when calling the .dll directly with Ghostscript.net? Or did I made a mistake somewhere else?
Here's my class:
public class PdfConverter
{
#region Private Fields
private List<GhostscriptVersionInfo> _Versions = GhostscriptVersionInfo.GetInstalledVersions(GhostscriptLicense.GPL | GhostscriptLicense.AFPL | GhostscriptLicense.Artifex);
#endregion
#region Private Properties
private GhostscriptVersionInfo Version { get; set; }
#endregion
#region Construction
public PdfConverter()
{
Version = GhostscriptVersionInfo.GetLastInstalledVersion();
}
#endregion
#region Public Members
public bool ConvertToPdf(DirectoryInfo dir)
{
var d = dir;
if(!d.Exists)
return false;
var postScriptFiles = d.GetFiles("*.ps");
var pdfFiles = postScriptFiles.Select(psf => new FileInfo(Path.ChangeExtension(psf.FullName, ".pdf")));
foreach(var file in postScriptFiles) {
//ThreadPool.QueueUserWorkItem(new WaitCallback((o) => {
Process(file, new FileInfo(Path.ChangeExtension(file.FullName, ".pdf")));
//}));
}
pdfFiles.ForEach(pdf => pdf?.Refresh());
return pdfFiles.All(pdf => pdf.Exists);
}
#endregion
#region Private Helpers
private void Process(FileInfo inputFile, FileInfo outputFile)
{
Console.WriteLine($"Converting {inputFile} to {outputFile}");
var proc = new GhostscriptProcessor(Version, true);
proc.Process(GetArgs(inputFile, outputFile).ToArray(), new ConsoleStdIO(true, true, true));
}
private IEnumerable<string> GetArgs(FileInfo inputFile, FileInfo outputFile)
{
return new [] {
$"-q ",
$"-sDEVICE=pdfwrite",
$"-dSAFER",
$"-dNOPAUSE",
$"-dBATCH",
$"-sPAPERSIZE=a4",
$"-dEmbedAllFonts=true",
$"-dAutoRotatePages=/None",
$"-sOutputFile=\"{outputFile.FullName}\"",
$"-dCompatibilityLevel#1.4",
$"-c .setpdfwrite",
$"-f \"{inputFile.FullName}\""
};
}
#endregion
}
Edit:
I forgot to mention: To implement it i had to make my own GhostsdcriptStdIO class. I admit that I'm not entirely sure if I did this right. Although it does get instanciated without exceptions, and override StdOut(...) get's called, and the output is written to the console as expected. override void StdError(...) get's called as well. And also written to the console as expeted.
The Output of the error btw is:
"**** Could not open the file "c:\temp\test.pdf""
"**** Unable to open the initial device, quitting."
Here's my ConsoleStdIO class:
public class ConsoleStdIO : Ghostscript.NET.GhostscriptStdIO
{
#region Construction
public ConsoleStdIO(bool handleStdIn, bool handleStdOut, bool handleStdError) : base(handleStdIn, handleStdOut, handleStdError) { }
#endregion
#region Overrides
public override void StdError(string error)
{
var foo = Encoding.Default.GetBytes(error);
var lenght = foo.Length;
using (var err = Console.OpenStandardError()) {
if(err.CanWrite)
err.Write(foo, 0, lenght);
}
}
public override void StdIn(out string input, int count)
{
byte[] bytes = new byte[0];
using(var stdInput = Console.OpenStandardInput()) {
stdInput.Read(bytes, 0, count);
}
input = Encoding.Default.GetString(bytes);
}
public override void StdOut(string output)
{
var foo = Encoding.Default.GetBytes(output);
var lenght = foo.Length;
using (var err = Console.OpenStandardError()) {
if(err.CanWrite)
err.Write(foo, 0, lenght);
}
}
#endregion
}
Again: doing the same operation with the exact same files and arguments using gswin32c.exe works fine.
Happy Hacking
Error -100 is gs_error_Fatal, which means 'something catastrophic went wrong'. Its an indication that the program failed to start up properly and we can't tell why. The back channel may contain more information.
And indeed, the back channel tells you what's wrong:
**** Could not open the file "c:\temp\test.pdf
**** Unable to open the initial device, quitting.
Ghostscript is unable to open the output file, which means it can't open the pdfwrite device (because that requires an output file) so it aborts the operation.
There could be a number of reasons why Ghostscript can't open the output file. The first thing I'd do is trim down the number of arguments;
You don't want -q (quiet) when you are trying to debug a problem, you want all the information you can get.
I'd remove -dSAFER at least to start with, because that prevents Ghostscript accessing directories outside the current working directory and certain 'special' ones. It may well prevent you accessing the temp directory.
You don't need to set EmbedAllFonts when its the same value as the default.
You could drop the CompatibilityLevel (and note that you've used a # there instead of an =) switch, and the AutoRotatePages while getting this to work.
The "-c .setpdfwrite -f" string has been pointless for years but people still keep using it. All that does these days is slow down the start of processing, ditch it.
Finally you can try changing the backslash ('\') characters to forward slash ('/') in case your string handling is messing that up, or use double backslashes (I'd use the forward slash myself).
You should also check that c:\test\temp.pdf doesn't exist, or if it does exist is not read-only or already open in a different application.
So I solved the problem...
After taking KenS' advice I could run the application without Ghostscript (not Ghostscript.NET) giving me any errors. But it did not produce an actual PDF File.
So KenS's answer did not quite solve the problem, but since 'less is more' and since he took the time to talk to me on IRC to verify that my args in itself were correct, I'll give the answer points nonetheless.
What actually solved my was the following:
Here my original GetArgs(...)
private IEnumerable<string> GetArgs(FileInfo inputFile, FileInfo outputFile)
{
return new [] {
$"-sDEVICE=pdfwrite",
$"-dNOPAUSE",
$"-dBATCH",
$"-sPAPERSIZE=a4",
#"-sFONTPATH=" + System.Environment.GetFolderPath(System.Environment.SpecialFolder.Fonts),
$"-sOutputFile={outputFile.FullName}",
$"{inputFile.FullName}",
};
}
Someone in #csharp pointed out to me, that in c, the first argument is always the name of the command. So he suggested to just put "gs" as the first argument (as a dummy) and try... And that's what actually solved my problem.
So this is how the working GetArgs(...) looks:
private IEnumerable<string> GetArgs(FileInfo inputFile, FileInfo outputFile)
{
return new [] {
$"gs",
$"-sDEVICE=pdfwrite",
$"-dNOPAUSE",
$"-dBATCH",
$"-sPAPERSIZE=a4",
#"-sFONTPATH=" + System.Environment.GetFolderPath(System.Environment.SpecialFolder.Fonts),
$"-sOutputFile={outputFile.FullName}",
$"{inputFile.FullName}",
};
}
On my form I have a button click
private void button1_Click(object sender, EventArgs e)
{
do something
}
How on the click would I load my do something from a text file, for example my text file looks like this:
MessageBox.Show("hello");
label1.Text = "Hello";
on click it does everything in my text file, if possible.
Here is a very simple example, just to prove this is possible. Basically, you use CodeDomProvider to compile source at runtime, then execute using reflection.
var provider = CodeDomProvider.CreateProvider("C#");
string src=#"
namespace x
{
using System;
public class y
{
public void z()
{
Console.WriteLine(""hello world"");
}
}
}
";
var result = provider.CompileAssemblyFromSource(new CompilerParameters(), src);
if (result.Errors.Count == 0)
{
var type = result.CompiledAssembly.GetType("x.y");
var instance = Activator.CreateInstance(type);
type.GetMethod("z").Invoke(instance, null);
}
Edit
As #Agat points out, the OP seems to require a sort of scripting framework (it makes use of label1, a property of the current object), whereas my answer above obviously does not provide that. The best I can think of is a limited solution, which would be to require dependencies to be specified explicitly as parameters in the "script". Eg, write the scripted code like this:
string src = #"
namespace x
{
using System.Windows;
public class y
{
public void z(Label label1)
{
MessageBox.Show(""hello"");
label1.Text = ""Hello"";
}
}
}
";
Now you can have the caller examine the parameters, and pass them in from the current context, again using reflection:
var result = provider.CompileAssemblyFromSource(new CompilerParameters(), src);
if (result.Errors.Count == 0)
{
var type = result.CompiledAssembly.GetType("x.y");
var instance = Activator.CreateInstance(type);
var method = type.GetMethod("z");
var args = new List<object>();
// assume any parameters are properties/fields of the current object
foreach (var p in method.GetParameters())
{
var prop = this.GetType().GetProperty(p.Name);
var field = this.GetType().GetField(p.Name);
if (prop != null)
args.Add(prop.GetValue(this, null));
else if (field != null);
args.Add(field.GetValue(this));
else
throw new InvalidOperationException("Parameter " + p.Name + " is not found");
}
method.Invoke(instance, args.ToArray());
}
Like the other answers have stated, it isn't an easy thing to implement and can possibly be done through reflection depending on how advanced your scripts are.
But no one #BrankoDimitrijevic mentioned Roslyn and it is a great tool. http://msdn.microsoft.com/en-us/vstudio/roslyn.aspx
It hasn't been updated in quite awhile (Sept.2012) and doesn't have all of the features of C# implemented, however, it did have a lot of it implemented when I played around with this release.
By adding your assembly as a reference to the scripting session, you're able to gain access to all of your assembly's types and script against them. It also supports return values so you can return any data that a scripted method generates.
You can find what isn't implemented here.
Below is a quick and dirty example of Roslyn that I just wrote and tested. Should work right out of box after installing Roslyn from NuGet. The small bloat at the initialization of the script engine can easily be wrapped up in a helper class or method.
The key is passing in a HostObject. It can be anything. Once you do, your script will have full access to the properties. Notice that you just call the properties and not the host object in the script.
Basically, your host object will contain properties of the data you need for your script. Don't necessarily think of your host object as just a single data object, but rather a configuration.
public class MyHostObject
{
public string Value1 { get; set; }
public string Value2 { get; set; }
}
public class RoslynTest
{
public void Test()
{
var myHostObject = new MyHostObject
{
Value1 = "Testing Value 1",
Value2 = "This is Value 2"
};
var engine = new ScriptEngine();
var session = engine.CreateSession(myHostObject);
session.AddReference(myHostObject.GetType().Assembly.Location);
session.AddReference("System");
session.AddReference("System.Core");
session.ImportNamespace("System");
// "Execute" our method so we can call it.
session.Execute("public string UpdateHostObject() { Value1 = \"V1\"; Value2 = \"V2\"; return Value1 + Value2;}");
var s = session.Execute<string>("UpdateHostObject()");
//s will return "V1V2" and your instance of myHostObject was also changed.
}
}
No. You can not.
At least in any simple way.
The thing you want is something like eval('do something') from javascript.
That's not possible to do with C#. C# is a language which needs compilation before execution unlike javascript (for instance).
The only way to implement that is to build your own (pretty complicated as for beginner) parser and execute it in such way.
UPDATED:
Actually, as JDB fairly noticed, that's really not the only way. I love programming! There are so many ways to make a freakky (or even sometimes that really can be necessary for some custom interesting tasks (or even learning)!) code. he he
Another approach I've got in my mind is building some .cs file, then compiling it on-the-fly and working with it as some assembly or some other module. Right.
i am trying to output a log of methods and their actions if taken and results into a "MyAppLog_ListView" the columnsHeaders of the lisftview Are
Record#______MethodName__________MethodsOutput
1 ______GetCurrentTime______success(21:10)
2 ______DoSplitString_______faild(not in right Format)
3......................................etc'...
this helps me debuging my program as it's over 1500 lines of code and atleast for me
it's getting a little too complex , the question is what is the right way to store methods name in a string
public void MyMethod()
{
do stuff
if (comleted) MyAppLog_ListView_AddRecord(string for the methods name, outputSucces)
else if (faild) MyAppLog_ListView_AddRecord(string for the methods name, outputFail)
}
how do i get MyMethod().Name to store in a string ?
ReEdit :
As to SidAhmeds Answer :
public void MyMethodName()
{
do stuff
string Mnam = MethodBase.GetCurrentMethod().Name;
if (comleted) MyAppLog_ListView_AddRecord(Mnam , outputSucces);
else if (faild) MyAppLog_ListView_AddRecord(Mnam , outputFail);
}
Or you could use reflection to do it :
System.Reflection.MethodBase.GetCurrentMethod().Name;
StackTrace st = new StackTrace();
var methodName = st.GetFrame(0).GetMethod().Name;
public void FindCityName()
{
string url = "http://maps.google.com/maps/geo?q=39.920794,32.853902&output=json&oe=utf8&sensor=true&key=MYKEY";
var w = new WebClient();
Observable.FromEvent<DownloadStringCompletedEventArgs>(w, "DownloadStringCompleted").Subscribe(r =>
{
var deserialized = JsonConvert.DeserializeObject<RootObject>(r.EventArgs.Result);
string s = deserialized.Placemark[0].AddressDetails.Country.SubAdministrativeArea.Locality.LocalityName;
/// setCity() and City=s produce the same thing
setCity(s);
City = s;
//foreach (var item in deserialized.Placemark)
//{
// //MessageBox.Show(item.AddressDetails.Country.SubAdministrativeArea.Locality.LocalityName);
// City = (string)item.AddressDetails.Country.SubAdministrativeArea.Locality.LocalityName;
//}
//Problem here >>>>>
////MessageBox.Show(City);
});
w.DownloadStringAsync(new Uri(url));
}
Problem:
I am working on a windows phone 7 application and I need to find the "City Name" from GPS coordinates in order to move forward...
I found the code above on the internet and tried it. I can see the city name by using these codes(Message.Box(City) show exactly what I want, the city name). However, this line of code
deserialized.Placemark[0].AddressDetails.Country.SubAdministrativeArea.Locality.LocalityName;
which gives me the city name seems to give a volatile string value.
For example, I created a method which assigns the value of string variable "s" to the string field of my class, name City. If I try to get the City's content after calling FindCityName() method, I see that City's content is not updated.
Again, same thing happens then I call the code line under the comment "Problem here >>>>>" that MessageBox.Show(City) shows nothing new...
Can someone explain me the reason of my problem?
you put this question on my blog as well, but I will answer it here. I feel a bit responsible for putting up the sample code in the first place ;-)
I am going to assume the class containing your code looks like this:
public class MyClass
{
private void MyMethod()
{
FindCityName();
MessageBox.Show(City);
}
private void FindCityName()
{
// Code omitted - see your question
}
private string City;
}
There is nothing volatile about the string. Your problem is asynchronicity. If you look carefully you will see that I use an observable that fires when the DownloadStringCompleted is fired. The code inside Observable.Event is only called when the download is finished but that happens asynchronously. But what I assume you do is call the FindCityName method and then directly trying to access results like I show in the MyMethod method. That's like directly wanting the result after firing the request. The results are not in yet! It's like a web page downloading - it takes a while. You can fix that with a callback, something like this:
public class MyClass
{
private void MyMethod()
{
FindName();
}
public void FindCityName()
{
string url = "http://maps.google.com/maps/geo?q=39.920794,32.853902&output=json&oe=utf8&sensor=true&key=MYKEY";
var w = new WebClient();
Observable.FromEvent<DownloadStringCompletedEventArgs>(w, "DownloadStringCompleted").Subscribe(r =>
{
var deserialized = JsonConvert.DeserializeObject<RootObject>(r.EventArgs.Result);
City = deserialized.Placemark[0].AddressDetails.Country.SubAdministrativeArea.Locality.LocalityName;
DoneDownloading();
});
w.DownloadStringAsync(new Uri(url));
}
private string City;
private void DoneDownloading
{
MessageBox.Show(City);
}
}
Does that help?
I would recommend you to use this Google Map API
http://maps.googleapis.com/maps/api/geocode/json?latlng=39.920794,32.853902&sensor=true
And once you get JSON response in your request. You can parse easily with NEWTONSOFT for wp7
WebClient wc = new WebClient();
var json = (JObject)JsonConvert.DeserializeObject(wc.DownloadString(url));
var locality= json["results"]
.SelectMany(x => x["address_components"])
.FirstOrDefault(t => t["types"].First().ToString() == "locality");
var name = locality!=null ? locality["long_name"].ToString() : "";