Re: How to scan all pages with one click as below: - C# Discussion Boards

19-Nov-19 1:36

I have the code below for scanning all papers. It works but the problem is when all papers will finish, it shows the error:

Exception User-Unhandeled System.runtime.InterpService.COMEException: Exception From HRESULT:0*80210003

which belongs to this line:
var imgFile = (ImageFile)ScanerItem.Transfer();
Does anyone know how to fix it?
Thanks

How can i fix it? Here is the code:

bool continueScanning2 = true;
    try
    {
        await Task.Run(() =>
        {
            var deviceManager = new DeviceManager();
            DeviceInfo AvailableScanner = null;
            while (continueScanning2)
            {
                for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
                {
                    if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                    {
                        continue;
                    }
                    AvailableScanner = deviceManager.DeviceInfos[i];
                    break;
                }
                var device = AvailableScanner.Connect();
                var ScanerItem = device.Items[1];
                var imgFile = (ImageFile)ScanerItem.Transfer();
                var data = (byte[])imgFile.FileData.get_BinaryData();
                var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);
                string name2 = Guid.NewGuid().ToString().Replace("-", "") + ".jpg";
                var Path = @"C:\Users\...\Desktop\test\" + name2; // save the image in some path with filename.
                pictureBox1.ImageLocation = Path;
                bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
        });
    }
    catch (COMException ex)
    {
        MessageBox.Show(ex.Message);
    }

Richard MacCutchan19-Nov-19 1:50

19-Nov-19 1:50

The error codes are listed at Error Codes (WIA) - Win32 apps | Microsoft Docs[^]. And 80210003 means there is no more paper in the document feeder.

Member 1094325619-Nov-19 1:59

19-Nov-19 1:59

Thanks for the reply. yes but i don't want to see this error code after the scanning process will be finished.
i want to see this warning whenever i click on the "scan button" and there is no paper in scanner device.

Richard MacCutchan19-Nov-19 2:19

19-Nov-19 2:19

Then you will have to probe the device first to see if there is paper loaded. The scanner can only report its current status, it is up to you to check the status at the correct time.

Member 1094325619-Nov-19 2:27

19-Nov-19 2:27

Could you please write this condition that how should i check it?
Thanks

Richard MacCutchan19-Nov-19 2:32

19-Nov-19 2:32

What do you mean? All you need is a simple if clause.

Member 1094325619-Nov-19 3:31

19-Nov-19 3:31

i wrote a while loop to check it until the device is loaded by it's not working.
Here are my code:

try
                {

                    object[] items = await Task.Run<object[]>(() =>
                    {

                        var deviceManager = new DeviceManager();
                        List<object> result = new List<object>();

                       
                        for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++) // Loop Through the get List Of Devices.
                        {
                            if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                            {
                                continue;
                            }
                            //new
                            result.Add(deviceManager.DeviceInfos[i].Properties["Name"].get_Value());
                        }
                        return result.ToArray();
                       

                    });

                    foreach (var item in items)
                    {
                        lstListOfScanner.Items.Add(item);
                    }
                
            }
                catch (COMException ex)
                {
                    MessageBox.Show(ex.Message);
                }

            int n = 1;
            bool continueRunning2 = true;
            try
            {
                await Task.Run(() =>
                {
                    var deviceManager = new DeviceManager();

                    DeviceInfo AvailableScanner = null;

                    for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
                    {
                        if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                        {
                            continue;
                        }

                        AvailableScanner = deviceManager.DeviceInfos[i];
                        break;
                    }
                    /*
                     if (AvailableScanner == null)
                     {
                         return;
                     }
                     */
                    var device = AvailableScanner.Connect();
                    while (AvailableScanner != null)
                    {

                        var ScanerItem = device.Items[1];
                        var imgFile = (ImageFile)ScanerItem.Transfer();

                        var data = (byte[])imgFile.FileData.get_BinaryData();
                        var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);

                        var Path = @"C:\Users\...\Desktop\test\" + n + ".jpg"; // save the image in some path with filename.
                        n++;
                        bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);
                    }
                });
            }
            catch (COMException ex)
            {

                MessageBox.Show(ex.Message);
            }

Richard MacCutchan19-Nov-19 3:40

19-Nov-19 3:40

What does "not working" mean?

Member 1094325619-Nov-19 3:52

19-Nov-19 3:52

It works still like before.
it scanns all pages and when they finished, it shows me the error of loading paper

Richard MacCutchan19-Nov-19 4:02

19-Nov-19 4:02

Yes, because the scanner is telling you that there is no more paper in the feeder. Why do you think this is an error?

Member 1094325619-Nov-19 4:08

19-Nov-19 4:08

Becuase i need it to works like it:
1) if there is no paper on the device and i click on "Scan" button, it shows me the warnning that i should load paper
but
2) if the scanner was already loaded, and i click on "Scan" button, it starts to scan all pages and at the end nothing happens! (or i added a meesagebox("Finish") but not this warning)

Richard MacCutchan19-Nov-19 4:13

19-Nov-19 4:13

When you catch the exception check to see which error code has been returned. If it is "No paper loaded" then post a message and try again.

Member 1094325619-Nov-19 4:30

19-Nov-19 4:30

if i write the code below, it shows me the message box when ever the device is empty!

catch (COMException ex)
{
uint errorCode = (uint)ex.ErrorCode;
if (errorCode == 0x80210003)
{
    MessageBox.Show("Load the scaner device!");
}
else
{
    MessageBox.Show(ex.Message);
}

but i do NOT want to see this message when the scan proccess will be finished.
(i want to see nothing when all papers scanned. just see a message if at the beginning i click and the device was empty)
Could you pls correct it?

Richard MacCutchan19-Nov-19 4:45

19-Nov-19 4:45

How does the application know that all the pages have been scanned?

Pete O'Hanlon19-Nov-19 2:02

19-Nov-19 2:02

According to the Windows Imaging Acquisition codes, that means the paper is empty. If you reach this point, it suggests that you have finished scanning. Something you need to consider; your while loop will never end until you hit an exception because you aren't setting it to false anywhere. Also, your logic looks very odd. You're evaluating the scanners each time through the while loop, and connecting again and again. You should move the for loop and the AvailableScanner.Connect outside the while loop; something like this perhaps:

for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
{
  if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
  {
    continue;
  }
  AvailableScanner = deviceManager.DeviceInfos[i];
  break;
}
if (AvailableScanner == null)
{
  return;
}
var device = AvailableScanner.Connect();
while (continueRunning2)
{
  // Are you absolutely certain you want array index 1 here?
  // Remember that arrays start at 0, so this might be a cause of
  // issues
  var ScanerItem = device.Items[1];
  ...
}

modified 19-Nov-19 8:08am.

Member 1094325619-Nov-19 2:23

19-Nov-19 2:23

Thanks but it didn't work. now the problem is with if statement which you added.
according to your suggetion, i changed it like below:
could you please say where is the problem?

int n = 1;
bool continueRunning2 = true;
try
    {
        await Task.Run(() =>
        {
            var deviceManager = new DeviceManager();

            DeviceInfo AvailableScanner = null;

                for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
                {
                    if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                    {
                        continue;
                    }

                    AvailableScanner = deviceManager.DeviceInfos[i];
                    break;
                }

                if (AvailableScanner != null)
                {
                    return;
                }

            var device = AvailableScanner.Connect();
            while (continueRunning2)
            {
                var ScanerItem = device.Items[1];
                var imgFile = (ImageFile)ScanerItem.Transfer();

                var data = (byte[])imgFile.FileData.get_BinaryData();
                var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);

                var Path = @"C:\Users\...\Desktop\test\" + n + ".jpg"; // save the image in some path with filename.
                n++;
                bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);

            }
        });

    }
    catch (COMException ex)
    {
    MessageBox.Show(ex.Message);
    }

Pete O'Hanlon19-Nov-19 2:37

19-Nov-19 2:37

Your version doesn't match mine. Check what's in my answer, I edited it as soon as I'd posted it because I noticed the problem with the if condition. The if statement says:

if (AvailableScanner == null)

Pete O'Hanlon19-Nov-19 2:38

19-Nov-19 2:38

A point to note. You still have the problem that you aren't actually setting your boolean condition to false anywhere so you're still going to throw the exception when the scanner finishes scanning documents.

Member 1094325619-Nov-19 2:50

19-Nov-19 2:50

i changed it but it still has the same problem as before (it shows the error of loading paper).

Below is my complete code, could you please check/correct it?

try
{

    object[] items = await Task.Run<object[]>(() =>
    {

        var deviceManager = new DeviceManager();
        List<object> result = new List<object>();


        for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++) // Loop Through the get List Of Devices.
            {
            if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                {
                continue;
            }
                //new
                result.Add(deviceManager.DeviceInfos[i].Properties["Name"].get_Value());
        }
        return result.ToArray();


    });

    foreach (var item in items)
    {
        lstListOfScanner.Items.Add(item);
    }

}
catch (COMException ex)
{
    MessageBox.Show(ex.Message);
}

int n = 1;
bool continueRunning2 = true;
try
{
    await Task.Run(() =>
        {
            var deviceManager = new DeviceManager();

            DeviceInfo AvailableScanner = null;

            for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
            {
                if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                {
                    continue;
                }

                AvailableScanner = deviceManager.DeviceInfos[i];
                break;
            }

            if (AvailableScanner == null)
            {
                return;
            }

            var device = AvailableScanner.Connect();
            while (continueRunning2)
            {
                var ScanerItem = device.Items[1];
                var imgFile = (ImageFile)ScanerItem.Transfer();
                var data = (byte[])imgFile.FileData.get_BinaryData();
                var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);
                var Path = @"C:\Users\...\Desktop\test\" + n + ".jpg"; // save the image in some path with filename.
                n++;
                bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
        });

}
catch (COMException ex)
{
    MessageBox.Show(ex.Message);
}

Pete O'Hanlon19-Nov-19 22:40

19-Nov-19 22:40

Your problem is that you are making the scope of your try/catch for the COMException too broad. As you only want to show the message if you haven't managed to successfully scan a single page, then all you really need to do is track whether or not you have scanned a page and show the message if you haven't. This could be done simply by using a boolean to track whether or not the page has loaded.

await Task.Run(() =>
 {
   var deviceManager = new DeviceManager();

   DeviceInfo AvailableScanner = null;

   for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
   {
     if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
     {
         continue;
     }

     AvailableScanner = deviceManager.DeviceInfos[i];
     break;
   }

   if (AvailableScanner == null)
   {
       return;
   }

   var device = AvailableScanner.Connect();
   bool hasScannedPage = false;
   while (continueRunning2)
   {
	  var ScanerItem = device.Items[1];
	  ImageFile imgFile = null;
	  try
	  {
	    imgFile = (ImageFile)ScanerItem.Transfer();
	  }
	  catch (COMException ex)
	  {
		 uint errorCode = (uint)ex.ErrorCode;
		 if (errorCode == 0x80210003 && !hasScannedPage)
		 {
		   // At this point, you know that you have not managed to scan
		   // any pages and you are receiving a paper out message, so
		   // you can inform the user that they need to load the device
		   MessageBox.Show("You cannot scan anything without loading the device");
		 }
		 // You cannot go any further so break out of the loop
		 break;
	  }
	  // By setting hasScannedPage to true, you won't show the message to the user
	  hasScannedPage = true;
	  var data = (byte[])imgFile.FileData.get_BinaryData();
	  var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);
	  var Path = @"C:\Users\...\Desktop\test\" + n + ".jpg"; // save the image in some path with filename.
	  n++;
	  bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);
   }
 });

Member 1094325620-Nov-19 0:35