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POUpdating a textbox from ISampleGrabberCB
 

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  1. POUpdating a textbox from ISampleGrabberCB
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    <p>I currently have a working program which displays a preview from my webcam and uses the ISampleGrabberCB interface.</p> <p>Using the <code>SampleCB</code> my program converts the image to a bitmap and then processes the image for a barcode which is then decoded. This works perfectly when I show the result using a <code>MessageBox</code> however when I wish to edit a textbox on my main form with this result I get a few errors when I start my program.</p> <p>I am trying to update my text box using the following code within the <code>ISampleGrabberCB</code> interface:</p> <pre><code>public int SampleCB(double sampletime, IMediaSample sample) { if (sample == null) { return -1; } try { int length = sample.GetActualDataLength(); IntPtr buffer; BitmapData bitmapData = new BitmapData(); Form1 f1 = new Form1("", "", ""); if (sample.GetPointer(out buffer) == 0 &amp;&amp; length &gt; 0) { Bitmap bitmapOfFrame = new Bitmap(width, height, pitch, PixelFormat.Format24bppRgb, buffer); } </code></pre> <p>The method changeTextBox1 is in my main form and is as follows:</p> <pre><code>public void changeTextBox1(string text) { textBox1.Text = text; } </code></pre> <p>The errors I get are firstly <code>A device attached to the system in not functioning properly</code> and then <code>no such supported interface</code>. This seems to only happen when I use the <code>Form1 f1 = new Form1("","","");</code> line.</p> <p>So as I said if i remove the line <code>Form1 f1 = new Form1("","","");</code> and replace <code>changeTextBox1(result.Text);</code> with <code>MessageBox.Show(result.Text.ToString());</code> this works.</p> <p>How would I go about updating the textbox instead of using a MessageBox?</p>
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