使用扫描仪而不在C＃对话框 [英] Using a scanner without dialogs in C#

问题描述

我要建一个扫描设备的远程控制.NET 4.0的应用程序。我已经试过这两个TWAIN和WIA库，但我有同样的问题。扫描图像的没有 扫描仪选择的和的扫描设置对话框的。

I'm building a .Net 4.0 application for remote control of a scanner device. I have tried both TWAIN and WIA libraries, but I have the same problem. Scanning images without scanner selection and scanning settings dialogs.

我发现在.net WIA脚本一个有用的文章，并修改了它这样：

I found a useful article on WIA scripting in .Net, and modified it to this:

private Image Scan(string deviceName)
{
    WiaClass wiaManager = null;       // WIA manager COM object
    CollectionClass wiaDevs = null;   // WIA devices collection COM object
    ItemClass wiaRoot = null;         // WIA root device COM object
    CollectionClass wiaPics = null;   // WIA collection COM object
    ItemClass wiaItem = null;         // WIA image COM object

    try
    {
        // create COM instance of WIA manager
        wiaManager = new WiaClass();

        // call Wia.Devices to get all devices
        wiaDevs = wiaManager.Devices as CollectionClass;
        if ((wiaDevs == null) || (wiaDevs.Count == 0))
        {
            throw new Exception("No WIA devices found!");
        }

        object device = null;
        foreach (IWiaDeviceInfo currentDevice in wiaManager.Devices)
        {
            if (currentDevice.Name == deviceName)
            {
                device = currentDevice;
                break;
            }
        }

        if (device == null)
        {
            throw new Exception
            (
                "Device with name \"" + 
                deviceName + 
                "\" could not be found."
            );
        }

        // select device
        wiaRoot = (ItemClass)wiaManager.Create(ref device); 

        // something went wrong
        if (wiaRoot == null)
        {
            throw new Exception
            (
                "Could not initialize device \"" + 
                deviceName + "\"."
            );
        }

        wiaPics = wiaRoot.GetItemsFromUI
        (
            WiaFlag.SingleImage,
            WiaIntent.ImageTypeColor
        ) as CollectionClass;

        if (wiaPics == null || wiaPics.Count == 0)
        {
            throw new Exception("Could not scan image.");
        }

        Image image = null;

        // enumerate all the pictures the user selected
        foreach (object wiaObj in wiaPics)
        {
            if (image == null)
            {
                wiaItem = (ItemClass)Marshal.CreateWrapperOfType
                (
                    wiaObj, typeof(ItemClass)
                );

                // create temporary file for image
                string tempFile = Path.GetTempFileName();

                // transfer picture to our temporary file
                wiaItem.Transfer(tempFile, false);

                // create Image instance from file
                image = Image.FromFile(tempFile);
            }

            // release enumerated COM object
            Marshal.ReleaseComObject(wiaObj);
        }

        if (image == null)
        {
            throw new Exception("Error reading scanned image.");
        }

        return image;
    }
    finally
    {
        // release WIA image COM object
        if (wiaItem != null)
            Marshal.ReleaseComObject(wiaItem);

        // release WIA collection COM object
        if (wiaPics != null)
            Marshal.ReleaseComObject(wiaPics);

        // release WIA root device COM object
        if (wiaRoot != null)
            Marshal.ReleaseComObject(wiaRoot);

        // release WIA devices collection COM object
        if (wiaDevs != null)
            Marshal.ReleaseComObject(wiaDevs);

        // release WIA manager COM object
        if (wiaManager != null)
            Marshal.ReleaseComObject(wiaManager);
    }
}

有了这个，我实际上设法选择配置设备（扫描方法的输入参数）和扫描后检索所产生的图像。

With this I actually managed to select the device from configuration (input parameter of the Scan method) and retrieve the resulting image after scan.

但随着扫描选项对话框（扫描使用DEVICENAME）的问题。由于这是一个远程控制程序，对话框将不会对用户可见，所以我需要在必要时使用默认设置，或使用设置从配置要么跳过它。

But the problem with scanning options dialog (Scan using DEVICENAME). As this is a remote control application, dialog will not be visible to the user, so I need to either skip it using default settings, or use settings from a configuration if necessary.

扫描选项对话框：

Scanning options dialog:

推荐答案

在最后我没有用写在扫描对话框中的问题的代码。我发现Windows图像采集2.0 库扫描的一个有用的例子，修改它符合我的需要。扫描没有任何对话。

In the end I did not use the code written in the question for scanning dialogs. I found a useful example of Scanning with Windows Image Acquisition 2.0 library and modified it to match my needs. Scanning without any dialogs.

我写的使用没有与C＃编写的应用实例净对话框的扫描器。

I wrote an article about Using a scanner without dialogs in .Net with an example application written in C#.

这篇关于使用扫描仪而不在C＃对话框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！