Re: Multi programming language - C# Discussion Boards

OriginalGriff4-Jun-20 6:35

4-Jun-20 6:35

We are still more than willing to help those that are stuck: but that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.

So we still need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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Advanced TypeScript Programming Projects

Pete O'Hanlon4-Jun-20 21:43

Pete O'Hanlon

4-Jun-20 21:43

Dammit, when I completed this exercise in my head, it told me that I had a syntax error on line 32. Darn. I have to debug my head now.

OriginalGriff4-Jun-20 21:50

4-Jun-20 21:50

Put a breakpoint on Line 30: A shot of tequila.
Carefully examine all variables: A tot of whisky per variable.
Single step your code: G&T.

Repeat until code is fixed or you are unable to concentrate.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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Advanced TypeScript Programming Projects

Pete O'Hanlon4-Jun-20 22:02

Pete O'Hanlon

4-Jun-20 22:02

Doh! I should have thought of that. Good call.

Multi programming language

Patrice T5-Jun-20 13:33

Patrice T

5-Jun-20 13:33

You show no attempt to solve the problem yourself, you have no question, your main effort is pasting the requirement, you just want us to do your HomeWork.
We do not do your HomeWork.
HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and to help your teacher to check your understanding of the courses you have taken and also the problems you have at applying them.
Any failure of you will help your teacher spot your weaknesses and set remedial actions.
Any failure of you will help you to learn what works and what don't, it is called 'trial and error' learning.
So, give it a try, reread your lessons and start working. If you are stuck on a specific problem, show your code and explain this exact problem, we might help.

Patrice

“Everything should be made as simple as possible, but no simpler.” Albert Einstein

Member 148535394-Jun-20 5:38

Member 14853539

4-Jun-20 5:38

Question: 1
Suppose using controls in Visual Studio you have developed the layout for a calculator in design mode as shown
below, and given names of button Add, Subtract, Multiply and divide as Plusbtn, Subbtn, Mulbtn and Divbtn
respectively. Names for TextBox labeled First Number, Second Number and Result are textBox1, textBox2 and
textBox3 respectively. If a number is entered in TextBox1 and TextBox2, clicking the buttons should produce result
of respective operation in TextBox3. Complete the code

Richard Deeming4-Jun-20 5:45

Richard Deeming

4-Jun-20 5:45

No, we are NOT going to do your homework for you.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

OriginalGriff4-Jun-20 6:34

4-Jun-20 6:34

We are more than willing to help those that are stuck: but that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.

So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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Advanced TypeScript Programming Projects

Pete O'Hanlon4-Jun-20 21:42

Pete O'Hanlon

4-Jun-20 21:42

Okay, I've completed the code in my head. That was fun. Now what?

OriginalGriff4-Jun-20 21:48

4-Jun-20 21:48

Write an article on it? Laugh | :laugh:

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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F-ES Sitecore5-Jun-20 2:37

F-ES Sitecore

5-Jun-20 2:37

If I was doing a course that asked me to create text boxes called textBox1, textBox2 etc, I would find a better course.

Are there any good apple ipad c# compilers?

Patrice T5-Jun-20 13:35

Patrice T

5-Jun-20 13:35

Patrice

“Everything should be made as simple as possible, but no simpler.” Albert Einstein

Ultra9603-Jun-20 1:20

Ultra960

3-Jun-20 1:20

I have been having trouble finding a good compiler for my iPad.

Re: Are there any good apple ipad c# compilers?

OriginalGriff3-Jun-20 1:25

How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

3-Jun-20 1:25

You won't find a compiler for C# on iPad - Apple are rather restrictive, and use ObjectiveC for apps.

You can use C# to write for Apple devices, but you will need Xamarin to do it - it's included in the last couple of versions of Visual Studio.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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arnold_w2-Jun-20 5:31

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

2-Jun-20 5:31

I need to parse numerical expressions, e.g. (UInt32)(512 * 1024) that we can assume comes from a WinForm TextBox during runtime. I tried using the following:

DataTable loDataTable = new DataTable();
DataColumn loDataColumn = new DataColumn("Eval", typeof(double), expression);
loDataTable.Columns.Add(loDataColumn);
loDataTable.Rows.Add(0);
return (UInt32)(double)(loDataTable.Rows[0]["Eval"]);

but this doesn't work because of the cast. So instead I tried the following, which is based on possible to execute code contained in a string ? - C# / C Sharp[^] :

public static bool parseDifficultExpression(string difficultExpression, out UInt32 parsedValue)
{
    try
    {
        string[] usingList = new string[] { "System",
                                            "System.Text",
                                            "System.Diagnostics" };
        string methodAsString = "    returnValue = " + difficultExpression + ";";
        string notUsed = "";
        parsedValue = (UInt32)Utilities.executeMethodAsString(usingList, methodAsString, notUsed, typeof(UInt32));
        return true;
    }
    catch (Exception)
    {
        parsedValue = 0xFFFFFFFF;
        return false;
    }
}

public static object executeMethodAsString(string[] usingList, string methodAsString, object args, Type returnType)
{
    string[] importList = new string[] { "System.dll" };
    string namespaceName = "myNameSpace";
    string className = "myClass";
    string methodName = "myMethod";

    //Create method
    CodeMemberMethod pMethod = new CodeMemberMethod();
    pMethod.Name = methodName;
    pMethod.Attributes = MemberAttributes.Public;
    pMethod.Parameters.Add(new CodeParameterDeclarationExpression(args.GetType(), "args"));
    pMethod.ReturnType = new CodeTypeReference(typeof(UInt32));
    string completeMethod =
        returnType + " returnValue = new " + returnType + "();" + "\r\n" +
        "try {"                                                 + "\r\n" +
            methodAsString                                      + "\r\n" +
        "} catch {"                                             + "\r\n" +
        "    returnValue = new " + returnType + "();"           + "\r\n" +
        "}"                                                     + "\r\n" +
        "return returnValue;";
    pMethod.Statements.Add(new CodeSnippetExpression(completeMethod));

//    Here you can look at what the assembled method looks like
//    Console.WriteLine(completeMethod);

    CodeTypeDeclaration pClass = new CodeTypeDeclaration(className);
    pClass.Attributes = MemberAttributes.Public;
    pClass.Members.Add(pMethod);
    CodeNamespace pNamespace = new CodeNamespace(namespaceName);
    pNamespace.Types.Add(pClass);
    for (int i = 0; i < usingList.Length; i++)
    {
        pNamespace.Imports.Add(new CodeNamespaceImport(usingList[i]));
    }

    CodeCompileUnit pUnit = new CodeCompileUnit();
    pUnit.Namespaces.Add(pNamespace);
    CompilerParameters pParams = new CompilerParameters(importList);
    pParams.GenerateInMemory = true;
    CompilerResults pResults = (new CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom(pParams, pUnit);

    if ((pResults.Errors != null) && (0 < pResults.Errors.Count))
    {
        foreach (CompilerError pError in pResults.Errors)
        {
            Debug.WriteLine(pError.ToString());
        }
        return null;
    }
    else
    {
        object typeInstance = pResults.CompiledAssembly.CreateInstance(namespaceName + "." + className);
        MethodInfo methodInfo = typeInstance.GetType().GetMethod(methodName);
        return methodInfo.Invoke(typeInstance, new object[] { args });
    }
}

This works fine, except that the line

CompilerResults pResults = (new CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom(pParams, pUnit);

is extremely slow (about 80 ms) to execute. Does anybody know a workaround to achieve what I want in fast execution time?

OriginalGriff2-Jun-20 5:50

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

2-Jun-20 5:50

Have you considered using an expression evaluator? A Tiny Expression Evaluator[^] for example.
Might be quicker than loading a whole compiler each time you want an expression ...

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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arnold_w2-Jun-20 9:40

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

2-Jun-20 9:40

It doesn't seem to be able to handle casts either, whenever I cast something in the "command prompt" (started by double-clicking TinyExe.exe) it gives me "Unexpected token '' found. Expected EOF".

arnold_w2-Jun-20 22:59

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

2-Jun-20 22:59

I tried to speed it up by doing all (several hundred) my conversions in the same method, so that instead of compiling several hundred times I compile just once but the method will be a lot larger. Well, this works fine until there's an illegally formatted string which creates a compile error... It is really so impossible to interpret casts in a fast way?

arnold_w3-Jun-20 2:39

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

3-Jun-20 2:39

I also tried the following, which is based on .net assembly - C# CompilerResults GenerateInMemory? - Stack Overflow[^], but it appears to compile even slower (I measured 208 ms):

public static class MyClass
{
    public static void Example()
    {
        Stopwatch watch = System.Diagnostics.Stopwatch.StartNew();
        dynamic instance = CompileSource(
            "namespace Test" +
            "{" +
            "    public class DynamicCompile" +
            "    { " +
            "       public void logHelloThere()" +
            "       {" +
            "           System.Diagnostics.Debug.WriteLine(\"Hello there\");" +
            "       }" +
            "    }" +
            "}").TryLoadCompiledType("Test.DynamicCompile");
        instance.logHelloThere();
        long elapsedMs = watch.ElapsedMilliseconds;
        Debug.WriteLine("Elapsed: " + elapsedMs);
    }


    public static CompilerResults CompileSource(string sourceCode)
    {
        var csc = new CSharpCodeProvider(
            new Dictionary<string, string>() { { "CompilerVersion", "v4.0" } });

        var referencedAssemblies =
                AppDomain.CurrentDomain.GetAssemblies()
                .Where(a => !a.FullName.StartsWith("mscorlib", StringComparison.InvariantCultureIgnoreCase))
                .Where(a => !a.IsDynamic) //necessary because a dynamic assembly will throw and exception when calling a.Location
                .Select(a => a.Location)
                .ToArray();

        var parameters = new CompilerParameters(referencedAssemblies);

        return csc.CompileAssemblyFromSource(parameters, sourceCode);
    }


    public static object TryLoadCompiledType(this CompilerResults compilerResults, string typeName, params object[] constructorArgs)
    {
        if (compilerResults.Errors.HasErrors)
        {
            Debug.WriteLine("Can not TryLoadCompiledType because CompilerResults.HasErrors");
            return null;
        }

        var type = compilerResults.CompiledAssembly.GetType(typeName);

        if (null == type)
        {
            Debug.WriteLine("Compiled Assembly does not contain a type [" + typeName + "]");
            return null;
        }
        return Activator.CreateInstance(type, constructorArgs);
    }
}

Gerry Schmitz3-Jun-20 6:40

Gerry Schmitz

3-Jun-20 6:40

You're creating a rather poor interpreter; it's not going to run like a compiler. I think you need a "calculator" class.

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

arnold_w3-Jun-20 9:30

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

3-Jun-20 9:30

There are several different ways to evaluate arithmetic expressions (just google), but all the ones I've tried have not been able to handle a simple cast, e.g.:

1 + (int)1

kalberts3-Jun-20 10:10

kalberts

3-Jun-20 10:10

None of the calculators I have had over the last 40 years have handled casts. Have you tried simply strip off the casts? Maybe a calculator library would work then.

Re: How can I compile code in runtime faster than CSharpCodeProvider()).CreateCompiler().CompileAssemblyFromDom?

arnold_w3-Jun-20 10:34

Converting InAppBilling.Plugin to Amazon

3-Jun-20 10:34

Yes, the casts can be stripped off unless they are there for a reason.

Exoskeletor2-Jun-20 3:52

Exoskeletor

2-Jun-20 3:52

Hello Guys,
I have create a Android application in Xamarin and i would like to also have in on Amazon store.
It uses in App purchases
Currently im implementing those purchases with this code:

public async Task<bool> WasItemPurchased(string productId)  
{  
var billing = CrossInAppBilling.Current;  
var result = false;  
try  
{  
var connected = await billing.ConnectAsync(ItemType.InAppPurchase);  
  
if (!connected)  
{  
//Couldn't connect  
return false;  
}  
  
//check purchases  
var verify = new InAppBillingVerify();  
var purchases = await billing.GetPurchasesAsync(ItemType.InAppPurchase, verify);  
  
//check for null just incase  
if (purchases?.Any(p => p.ProductId == productId) ?? false)  
{  
//Purchase restored  
Preferences.Set(productId, true);  
return true;  
}  
else  
{  
//no purchases found  
//Toast.MakeText(this, GetString(Resource.String.Options_RestoreUnavailable), ToastLength.Long);  
return false;  
}  
}  
catch (InAppBillingPurchaseException purchaseEx)  
{  
var message = string.Empty;  
switch (purchaseEx.PurchaseError)  
{  
case PurchaseError.AppStoreUnavailable:  
RestorePurchasesStatusMessage = GetString(Resource.String.Options_PaidFunctions_ErrorAppStoreUnavailable);  
break;  
case PurchaseError.BillingUnavailable:  
RestorePurchasesStatusMessage = GetString(Resource.String.Options_PaidFunctions_ErrorBillingUnavailable);  
break;  
case PurchaseError.PaymentInvalid:  
RestorePurchasesStatusMessage = GetString(Resource.String.Options_PaidFunctions_ErrorPaymentInvalid);  
break;  
case PurchaseError.PaymentNotAllowed:  
RestorePurchasesStatusMessage = GetString(Resource.String.Options_PaidFunctions_ErrorPaymentNotAllowed);  
break;  
case PurchaseError.AlreadyOwned:  
RestorePurchasesStatusMessage = GetString(Resource.String.Options_PaidFunctions_ErrorAlreadyOwned);  
Preferences.Set(productId, true);  
result = true;  
break;  
}  
  
//Decide if it is an error we care about  
if (string.IsNullOrWhiteSpace(message))  
return false;  
  
//Display message to user  
//Toast.MakeText(this, message, ToastLength.Long);  
}  
catch (Exception exception)  
{  
Crashes.TrackError(exception);  
//Something has gone wrong  
RestorePurchasesStatusMessage = GetString(Resource.String.Options_PaidFunctions_ErrorAppStoreUnavailable);  
//Toast.MakeText(this, GetString(Resource.String.Options_PaidFunctions_ErrorAppStoreUnavailable), ToastLength.Long);  
}  
finally  
{  
await billing.DisconnectAsync();  
}  
  
return result;  
}  
  
public async Task<bool> PurchaseItem(string productId, string payload)  
{  
var billing = CrossInAppBilling.Current;  
try  
{  
var connected = await billing.ConnectAsync(ItemType.InAppPurchase);  
if (!connected)  
{  
//we are offline or can't connect, don't try to purchase  
return false;  
}  
  
//check purchases  
var verify = new InAppBillingVerify();  
var purchase = await billing.PurchaseAsync(productId, ItemType.InAppPurchase, payload, verify);  
  
//possibility that a null came through.  
if (purchase == null)  
{  
//did not purchase  
}  
else if (purchase.State == PurchaseState.Purchased)  
{  
//purchased!  
Preferences.Set(productId, true);  
}  
}  
catch (InAppBillingPurchaseException purchaseEx)  
{  
var message = string.Empty;  
switch (purchaseEx.PurchaseError)  
{  
case PurchaseError.AppStoreUnavailable:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorAppStoreUnavailable);  
break;  
case PurchaseError.BillingUnavailable:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorBillingUnavailable);  
break;  
case PurchaseError.PaymentInvalid:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorPaymentInvalid);  
break;  
case PurchaseError.PaymentNotAllowed:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorPaymentNotAllowed);  
break;  
case PurchaseError.AlreadyOwned:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorAlreadyOwned);  
Preferences.Set(productId, true);  
EnableOrDisableProFeatures();  
break;  
}  
  
//Decide if it is an error we care about  
if (string.IsNullOrWhiteSpace(message))  
return false;  
  
//Display message to user  
DisplayToast(message, ToastLength.Long);  
  
}  
catch (Exception exception)  
{  
Crashes.TrackError(exception);  
//Something else has gone wrong, log it  
//Debug("Issue connecting: " + ex);  
DisplayToast(GetString(Resource.String.Options_PaidFunctions_ErrorAppStoreUnavailable), ToastLength.Long);  
  
}  
finally  
{  
await billing.DisconnectAsync();  
}  
return false;  
}  
  
private async Task RestorePurchases()  
{  
var currentConnectivity = Connectivity.NetworkAccess;  
var restorePurchasesResults = new List<bool>();  
if (currentConnectivity == NetworkAccess.Internet)  
{  
restorePurchasesResults.Add(await WasItemPurchased(GetString(Resource.String.Options_PaidFunctions_PurchaseTemplatesAndMoreButtons)));  
restorePurchasesResults.Add(await WasItemPurchased(GetString(Resource.String.Options_PaidFunctions_PurchaseCustomResources)));  
restorePurchasesResults.Add(await WasItemPurchased(GetString(Resource.String.Options_PaidFunctions_PurchaseDisplayWebpageAfterVote)));  
if (restorePurchasesResults.Contains(true))  
{  
DisplayToast(GetString(Resource.String.Options_PaidFunctions_PurchasesRestored), ToastLength.Long);  
  
EnableOrDisableProFeatures();  
}  
else  
{  
if (string.IsNullOrEmpty(RestorePurchasesStatusMessage))  
RestorePurchasesStatusMessage = GetString(Resource.String.Options_PaidFunctions_PurchasesNotFound);  
DisplayToast(RestorePurchasesStatusMessage, ToastLength.Long);  
  
}  
}  
else  
{  
DisplayToast(GetString(Resource.String.Options_InternetUnavailable), ToastLength.Long);  
  
}  
}  
  
private async Task<string> GetProductPrice(string productId)  
{  
var billing = CrossInAppBilling.Current;  
try  
{  
  
var connected = await billing.ConnectAsync(ItemType.InAppPurchase);  
  
if (!connected)  
{  
//Couldn't connect  
return string.Empty;  
}  
  
//check purchases  
var item = await billing.GetProductInfoAsync(ItemType.InAppPurchase, productId);  
  
if (item != null)  
return item.ToList()[0].LocalizedPrice;  
}  
catch (InAppBillingPurchaseException purchaseEx)  
{  
var message = string.Empty;  
switch (purchaseEx.PurchaseError)  
{  
case PurchaseError.AppStoreUnavailable:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorAppStoreUnavailable);  
break;  
case PurchaseError.BillingUnavailable:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorBillingUnavailable);  
break;  
case PurchaseError.PaymentInvalid:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorPaymentInvalid);  
break;  
case PurchaseError.PaymentNotAllowed:  
message = GetString(Resource.String.Options_PaidFunctions_ErrorPaymentNotAllowed);  
break;  
}  
  
//Decide if it is an error we care about  
if (string.IsNullOrWhiteSpace(message))  
return string.Empty;  
  
//Display message to user  
DisplayToast(message, ToastLength.Long);  
  
}  
catch (Exception exception)  
{  
Crashes.TrackError(exception);  
//Something has gone wrong  
}  
finally  
{  
await billing.DisconnectAsync();  
}  
return string.Empty;  
}

And i have to do similar function for the Amazon store like the API details here:
https://developer.amazon.com/docs/cross-platform-plugins/cpp-use-the-iap-plugin-for-xamarin.html
However i dont even know where to start to convert those functions, Amazon API confuse me, can someone help me?

Re: Converting InAppBilling.Plugin to Amazon

OriginalGriff2-Jun-20 4:38