does not exist in the current context

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Hi I'm getting this error while trying to build a project, its part of a project looking at a webcam to find a AR symbol, watching 1 webcam, but now I want to watch 2 separate webcams, so instead of doubling the code I've tried to take the code out an call it but I get the following error.

"The name 'glyphValues' does not exist in the current context"

I had the code working with the existing code:

C#

if (confidence >= minConfidenceLevel)
{

    resMatching = CheckForMatching(Glyph_1, glyphValues);
            if (resMatching != -1)
            {
                this.Invoke(new MethodInvoker(delegate
                {
                    getidbox.Text = ("1");
                    checkdatabase();
                }));
            }


    // Debug.Print(System.Convert.ToString(confidence));
    ImgRes.Image = glyphImage.ToManagedImage();
    ImgRes2.Image = glyphImage.ToManagedImage();

}

but now i get the error when i do this:

C#

if (confidence >= minConfidenceLevel)
                        {

                            symbolslist();


                            // Debug.Print(System.Convert.ToString(confidence));
                            ImgRes.Image = glyphImage.ToManagedImage();
                            ImgRes2.Image = glyphImage.ToManagedImage();

                        }
                    }
                }
            }
            // *************************
            // Display result in window
            // *************************
            pictureBox1.Image = grayImage.ToManagedImage();
            GC.Collect();
        }

        public void symbolslist()
        {

            // NEW SYMBOLS
            resMatching = CheckForMatching(Glyph_1, glyphValues);
            if (resMatching != -1)
            {
                this.Invoke(new MethodInvoker(delegate
                {
                    getidbox.Text = ("1");
                    checkdatabase();
                }));
            }
}

Anyone?

Posted 10-Sep-13 4:25am

PeterHall

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2 solutions

Solution 2

Awesome! works like a dream.

Slight deviation, how would I be able to move this out of that file and into another.

E.g. Like a module.

Posted 10-Sep-13 5:17am

PeterHall

Comments

Ron Beyer 10-Sep-13 11:25am

You should post this as a comment to the above solution (not as a new solution). However, the concept of "modules" does not exist in C# (its a VB thing). In order to move it into its own "file" you can create a new class that holds this function. You could also declare the class that its currently in as "partial" but I really dislike doing that since it makes it difficult to maintain.

Sergey Alexandrovich Kryukov 10-Sep-13 12:42pm

Also, the class could be partial, some parts on different files...
There are many cases (with appropriate coding style, of course) when it's not difficult to maintain, but, just the opposite, highly improve maintenance.
—SA

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norbitrial · Accepted Answer · 2013-09-10T04:32:00

Solution 1

I think the symbolslist method is in other context, so the glyphValues variable does not exist in it.

You should add as a parameter the glyphValues to the symbolslist method:

C#

public void symbolslist(byte[] glyphValues)
{
    // NEW SYMBOLS
    resMatching = CheckForMatching(Glyph_1, glyphValues);
    if (resMatching != -1)
    {
        this.Invoke(new MethodInvoker(delegate
        {
             getidbox.Text = ("1");
             checkdatabase();
        }));
    }
}

And now you can call the method:

C#

if (confidence >= minConfidenceLevel)
{
     symbolslist(glyphValues);

     // Debug.Print(System.Convert.ToString(confidence));
     ImgRes.Image = glyphImage.ToManagedImage();
     ImgRes2.Image = glyphImage.ToManagedImage();
}

Posted 10-Sep-13 4:32am

norbitrial

Updated 10-Sep-13 4:57am

v7

Comments

PeterHall 10-Sep-13 10:36am

How would I go about that?

norbitrial 10-Sep-13 10:40am

I've improved my solution. I don't know what the glyphValues's type is, but you can change to the original one.

PeterHall 10-Sep-13 10:48am

i've just tried you solution, got some different errors e.g.

"The best overloaded method match for 'CTCAM3.MainForm.CheckForMatching(byte[*,*], byte[*,*])' has some invalid arguments"

and

"Argument 2: cannot convert from 'object' to 'byte[*,*]'"

any other ideas?

norbitrial 10-Sep-13 10:54am

If the glyphValues variable is a byte array, it will work well. I've changed the head of your method: public void symbolslist(byte[] glyphValues)

Let me know if does not work.