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POWhy does my code throw an exception when I try to scan using WIA?
 

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  1. POWhy does my code throw an exception when I try to scan using WIA?
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    <p>I'm making an application on C# Winforms which scans documents and places them into a PictureBox, However when I attempt to scan it throws an exception saying "Object Reference not set to an instance of an object" and will not allow me to continue, the stack trace is as below;</p> <p>To clarify, this is a work project in case anyone gets alarmed by some of the class names.</p> <pre><code>AbDesktop.exe!AbDesktop.FrmCreditCards.ScanSetup() Line 39 C# AbDesktop.exe!AbDesktop.FrmCreditCards.ScanFrontBtn_Click(object sender, System.EventArgs e) Line 94 + 0x8 bytes C# [External Code] AbDesktop.exe!AbDesktop.Program.Main(string[] args) Line 26 + 0x20 bytes C# [External Code] </code></pre> <p>this is the code that is causing the issue;</p> <pre><code> public void ScanSetup() { WIA.CommonDialog dialog = new WIA.CommonDialog(); ImageFile scannedImage=null; scannedImage = dialog.ShowAcquireImage( WiaDeviceType.ScannerDeviceType, WiaImageIntent.UnspecifiedIntent, WiaImageBias.MaximizeQuality, FormatID.wiaFormatPNG, true, true, false); scannedImage.SaveFile("C:/Users/reece.cottam/Pictures"); } </code></pre> <p>and this is the button that executes the above code when the click event is fired</p> <pre><code>private void ScanFrontBtn_Click(object sender, EventArgs e) { ScanSetup(); ImageFile IF = new ImageFile(); FrontScanBox.Image = IF.LoadFile("scannedimage.png"); } </code></pre> <p>Any help would be greatly appreciated.</p> <p><em><strong>EDIT</em></strong> The line of code causing the error is ScannedImage.Savefile</p>
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    1. USCaptain_Custard
    1. USCaptain_Custard
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    1. COWhich line throws the exception? What does the stack trace look like? *Always* give this information in a question with an exception...
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      1. POWhy does my code throw an exception when I try to scan using WIA?
      1. USJon Skeet
    2. COI think you are loading an image from the current directory,and you didnt scanned it there.
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      1. POWhy does my code throw an exception when I try to scan using WIA?
      1. USterrybozzio
    3. COI see! How do I resolve this then?
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      1. POWhy does my code throw an exception when I try to scan using WIA?
      1. USCaptain_Custard
 

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