C#•14mo ago

some problems with async await

hey guys before anything sorry for my bad english but here's my problems: 1. how can i add an item to a listbox in an async event method of a bindinglist's listchanged event. 2. whe i have one async method in my code there is no problems but when i have 2 or more async methods no matter wich one is running or one of them is running my app thows an exeption in delegate class and usually it's "parameter is not valid" and i have one guess and that is when in a try catch block some error happens it show me "parameter not valid" exeption in delegate class. i will be appreciated if you guys can help me

39 Replies

Vigil Light•14mo ago

I can guide you

MamadOP•14mo ago

thank you so much so what should i do?

Vigil Light•14mo ago

First show me your problem with code

JakenVeina•14mo ago

$code

MODiX•14mo ago

To post C# code type the following: ```cs // code here ``` Get an example by typing $codegif in chat For longer snippets, use: https://paste.mod.gg/

MamadOP•14mo ago

 void list_ListChanged(object sender, ListChangedEventArgs e)
{
    listBox1.DataSource = null;
    listBox1.DataSource = list;
    if (listBox1.Items.Count > 0)
    {
        //listBox1.SelectedItem = null; 
        //listBox1.SelectedItem = listBox1.Items[listBox1.Items.Count - 1];
        listBox1.SelectedIndex = listBox1.Items.Count - 1;
    }

}

 void list_ListChanged(object sender, ListChangedEventArgs e)
{
    listBox1.DataSource = null;
    listBox1.DataSource = list;
    if (listBox1.Items.Count > 0)
    {
        //listBox1.SelectedItem = null; 
        //listBox1.SelectedItem = listBox1.Items[listBox1.Items.Count - 1];
        listBox1.SelectedIndex = listBox1.Items.Count - 1;
    }

}

i have bindinglist named list and this method is it's listchanged event and i add content to my binding list in

 bool RegisterPerson(Person p)

 bool RegisterPerson(Person p)

method and

RegisterPerson

RegisterPerson

method is called like this in a button's click event

private async void button1_Click(object sender, EventArgs e)
{
    await Task.Run(() => { StartBot(SavedPeopleForm.people); });
}

private async void button1_Click(object sender, EventArgs e)
{
    await Task.Run(() => { StartBot(SavedPeopleForm.people); });
}

JakenVeina•14mo ago

threading exception?

MamadOP•14mo ago

this is for the listbox and it doesn't throw any exception neither it doesn't update the listbox

JakenVeina•14mo ago

sooo thst's probably because it's throwing an exception

private async void button1_Click(object sender, EventArgs e)
{
    await Task.Run(() => { StartBot(SavedPeopleForm.people); });

    var x = 0;
}

private async void button1_Click(object sender, EventArgs e)
{
    await Task.Run(() => { StartBot(SavedPeopleForm.people); });

    var x = 0;
}

set a breakpoint on var x also on the await

MamadOP•14mo ago

it didn't worked let me send you the exception System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.' inner exception Parameter is not valid and it throws the exception in delegate class and the final line of the

protected virtual object DynamicInvokeImpl(object[] args)
{
    RuntimeMethodInfo runtimeMethodInfo = (RuntimeMethodInfo)RuntimeType.GetMethodBase(methodHandle: new RuntimeMethodHandleInternal(GetInvokeMethod()), reflectedType: (RuntimeType)GetType());
    return runtimeMethodInfo.UnsafeInvoke(this, BindingFlags.Default, null, args, null);
}

protected virtual object DynamicInvokeImpl(object[] args)
{
    RuntimeMethodInfo runtimeMethodInfo = (RuntimeMethodInfo)RuntimeType.GetMethodBase(methodHandle: new RuntimeMethodHandleInternal(GetInvokeMethod()), reflectedType: (RuntimeType)GetType());
    return runtimeMethodInfo.UnsafeInvoke(this, BindingFlags.Default, null, args, null);
}

method

JakenVeina•14mo ago

what's the inner exception?

MamadOP•14mo ago

Parameter is not valid

JakenVeina•14mo ago

where?

MamadOP•14mo ago

in the last line of this method in the delegate class

JakenVeina•14mo ago

no the inner exception

MamadOP•14mo ago

This exception was originally thrown at this call stack: System.Drawing.Bitmap.Bitmap(System.IO.Stream) Kambiznet_bot.Bot.BotForm.TakeScreenshot(string, string) in BotForm.cs Kambiznet_bot.Bot.BotForm.CaptchaSolver(Microsoft.ML.ITransformer, Microsoft.ML.MLContext, string) in BotForm.cs Kambiznet_bot.Bot.BotForm.RegisterPerson(Kambiznet_bot.Models.Person) in BotForm.cs Kambiznet_bot.Bot.BotForm.StartBot(System.Collections.Generic.List<Kambiznet_bot.Models.Person>) in BotForm.cs Kambiznet_bot.Bot.BotForm.button1_Click.AnonymousMethod__20_0() in BotForm.cs System.Threading.Tasks.Task.Execute() in Task.cs Kambiznet_bot.Bot.BotForm.button1_Click(object, System.EventArgs) in BotForm.cs

JakenVeina•14mo ago

Kambiznet_bot.Bot.BotForm.TakeScreenshot(string, string) in BotForm.cs

Kambiznet_bot.Bot.BotForm.TakeScreenshot(string, string) in BotForm.cs

where

System.Drawing.Bitmap.Bitmap(System.IO.Stream)

System.Drawing.Bitmap.Bitmap(System.IO.Stream)

is being called

JakenVeina•14mo ago

https://learn.microsoft.com/en-us/dotnet/api/system.drawing.bitmap.-ctor?view=dotnet-plat-ext-7.0#system-drawing-bitmap-ctor(system-io-stream)

Bitmap Constructor (System.Drawing)

Initializes a new instance of the Bitmap class.

JakenVeina•14mo ago

ArgumentException
stream does not contain image data or is null.

-or-

stream contains a PNG image file with a single dimension greater than 65,535 pixels

ArgumentException
stream does not contain image data or is null.

-or-

stream contains a PNG image file with a single dimension greater than 65,535 pixels

MamadOP•14mo ago

Bitmap clone;

using (var ms = new MemoryStream(bytes))
{
    clone = new Bitmap(ms);

    clone = new Bitmap(clone, new Size(390, 90));

    AdjustContrast(clone, 0.5f);
    AdjustExposure(clone, -0.4f);

    clone = clone.Clone(new Rectangle(0, 0, 230, 90), clone.PixelFormat);



    CropAndSaveScreenshot(clone, SavePathAndName + 1 + ".jpeg", x1, y1, width1, height1);
    CropAndSaveScreenshot(clone, SavePathAndName + 2 + ".jpeg", x2, y2, width2, height2);
    CropAndSaveScreenshot(clone, SavePathAndName + 3 + ".jpeg", x3, y3, width3, height3);
    CropAndSaveScreenshot(clone, SavePathAndName + 4 + ".jpeg", x4, y4, width4, height4);
    clone.Save("temp/test.jpeg");
    clone.Dispose();
}

Bitmap clone;

using (var ms = new MemoryStream(bytes))
{
    clone = new Bitmap(ms);

    clone = new Bitmap(clone, new Size(390, 90));

    AdjustContrast(clone, 0.5f);
    AdjustExposure(clone, -0.4f);

    clone = clone.Clone(new Rectangle(0, 0, 230, 90), clone.PixelFormat);



    CropAndSaveScreenshot(clone, SavePathAndName + 1 + ".jpeg", x1, y1, width1, height1);
    CropAndSaveScreenshot(clone, SavePathAndName + 2 + ".jpeg", x2, y2, width2, height2);
    CropAndSaveScreenshot(clone, SavePathAndName + 3 + ".jpeg", x3, y3, width3, height3);
    CropAndSaveScreenshot(clone, SavePathAndName + 4 + ".jpeg", x4, y4, width4, height4);
    clone.Save("temp/test.jpeg");
    clone.Dispose();
}

JakenVeina•14mo ago

so, bytes appears to be invalid data what's in it?

MamadOP•14mo ago

Image screenshotPath1 = Image.FromFile("temp/cropped1.jpeg");
Image screenshotPath2 = Image.FromFile("temp/cropped2.jpeg");
Image screenshotPath3 = Image.FromFile("temp/cropped3.jpeg");
Image screenshotPath4 = Image.FromFile("temp/cropped4.jpeg");




byte[] bytes1 = null;
byte[] bytes2 = null;
byte[] bytes3 = null;
byte[] bytes4 = null;

bytes1 = ImageToByteArray(screenshotPath1);
bytes2 = ImageToByteArray(screenshotPath2);
bytes3 = ImageToByteArray(screenshotPath3);
bytes4 = ImageToByteArray(screenshotPath4);

screenshotPath1.Dispose();
screenshotPath2.Dispose();
screenshotPath3.Dispose();
screenshotPath4.Dispose();

Image screenshotPath1 = Image.FromFile("temp/cropped1.jpeg");
Image screenshotPath2 = Image.FromFile("temp/cropped2.jpeg");
Image screenshotPath3 = Image.FromFile("temp/cropped3.jpeg");
Image screenshotPath4 = Image.FromFile("temp/cropped4.jpeg");




byte[] bytes1 = null;
byte[] bytes2 = null;
byte[] bytes3 = null;
byte[] bytes4 = null;

bytes1 = ImageToByteArray(screenshotPath1);
bytes2 = ImageToByteArray(screenshotPath2);
bytes3 = ImageToByteArray(screenshotPath3);
bytes4 = ImageToByteArray(screenshotPath4);

screenshotPath1.Dispose();
screenshotPath2.Dispose();
screenshotPath3.Dispose();
screenshotPath4.Dispose();

i used bytes only in this part

JakenVeina•14mo ago

okay which one is bytes?

MamadOP•14mo ago

what do you mean exactly?

SinFluxx•14mo ago

using (var ms = MemoryStream(bytes)) As in what are you passing to the MemoryStream

MamadOP•14mo ago

nothing

using (MemoryStream ms = new MemoryStream())
{
    imageIn.Save(ms, imageIn.RawFormat);
    return ms.ToArray();
}

using (MemoryStream ms = new MemoryStream())
{
    imageIn.Save(ms, imageIn.RawFormat);
    return ms.ToArray();
}

should i pass the byte array to the memorystream?

SinFluxx•14mo ago

I was quoting the code you posted...

SinFluxx•14mo ago

MamadOP•14mo ago

oh ok i see

var bytes = Convert.FromBase64String(Image);

var bytes = Convert.FromBase64String(Image);

SinFluxx•14mo ago

And what's Image?

MamadOP•14mo ago

public class GetHtmlW
{

    public static string G(string Html, string Value, string End)
    {
        int I = Html.IndexOf(Value);
        string WS = "";

        if (I > -1)
        {
            int W = I + Value.Length;
            WS = Html.Substring(W, Html.IndexOf(End, W) - W);

        }


        return WS;
    }
}

public class GetHtmlW
{

    public static string G(string Html, string Value, string End)
    {
        int I = Html.IndexOf(Value);
        string WS = "";

        if (I > -1)
        {
            int W = I + Value.Length;
            WS = Html.Substring(W, Html.IndexOf(End, W) - W);

        }


        return WS;
    }
}

var HtmlW = driver.FindElement(By.XPath("/html/body")).GetAttribute("innerHTML").ToString();


string Image = GetHtmlW.G(HtmlW, $"id=\"{captchaId}\" src=\"data:image/jpeg;base64,", "\"");

var HtmlW = driver.FindElement(By.XPath("/html/body")).GetAttribute("innerHTML").ToString();


string Image = GetHtmlW.G(HtmlW, $"id=\"{captchaId}\" src=\"data:image/jpeg;base64,", "\"");

it extracts an image from a website and turn it into byte array and then to Image

SinFluxx•14mo ago

Have you checked what it's actually returning when it tries to get the image?

MamadOP•14mo ago

in G method?

SinFluxx•14mo ago

Yeah, have you debugged all the way through to see its doing what you think it's doing?

MamadOP•14mo ago

to be honest i have no idea because i copied this part of code but i cheaked it before and i didn't understand what it's doing

SinFluxx•14mo ago

I mean I would suggest you need to set some breakpoints and follow it through step by step, see if things are actually getting set correctly/try and understand the code too

MamadOP•14mo ago

ok it returns a string with some none sense content but it will correctly save and crop images

Will•14mo ago

is your base64 string actually a valid image? try pasting it in here https://base64.guru/converter/decode/image

MamadOP•14mo ago

i cheaked it in that website and it was valid

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some problems with async await