如何一键扫描所有页面如下：

Question

我有下面的代码可以扫描所有文件。它有效，但问题是当所有论文完成时，它显示错误：

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

属于这一行：

var imgFile = (ImageFile)ScanerItem.Transfer();

我该如何解决？这是代码：

        public async void button1_Click(object sender, EventArgs e)
        {

                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);
                }    
bool continueScanning2 = true;
    try
    {
        await Task.Run(() =>
        {
            var deviceManager = new DeviceManager();
            DeviceInfo AvailableScanner = null;
            while (continueScanning2)
            {

                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);
    }

Answer 1

此 microsoft page 上提供的错误代码说明说

WIA_ERROR_PAPER_EMPTY

There are no documents in the document feeder.

并且您确认在扫描所有文件时显示错误。

在 catch 块中，您可以检查错误代码并以您认为合适的方式处理遇到 WIA_ERROR_PAPER_EMPTY 错误的情况：

catch (COMException ex)
{
    uint errorCode = (uint)ex.ErrorCode;
    if (errorCode == 0x80210003)
    {
        // handle "There are no documents in the document feeder"
    }
    else
    {
        MessageBox.Show(ex.Message);
    }
}

如何一键扫描所有页面如下：

How to scan all pages with one click as below:

c#

wia

scanning

c#-3.0

c#-4.0