如何使用 Web twain 从扫描仪获取扫描图像作为 HTML 文件输入字段的输入？

Question

如何从扫描仪获取图像输出作为 HTML 文件输入字段的文件输入。我正在使用 dynasoft web twain api 来扫描图像。http://www.dynamsoft.com/Support/DWTGuide/Dynamic%20Web%20TWAIN%20SDK.html#Manual

获取扫描图像的片段 -

    var DWObject = Dynamsoft.WebTwainEnv.GetWebTwain('dwtcontrolContainer');
    DWObject.IfDisableSourceAfterAcquire = true;    // Source will be closed automatically after acquisition.
    DWObject.SelectSource();                        // Select a Data Source (a device like scanner) from the Data Source Manager.
    DWObject.OpenSource();                          // Open the source. You can set resolution, pixel type, etc. after this method. Please refer to the sample 'Scan' -> 'Custom Scan' for more info.
    DWObject.AcquireImage();

文件输入片段 -

<input type="file" id="fileselect" accept="image/*,application/pdf" capture="camera" app-file-select="onFileSelect($files)" app-change="getFile($files)" app-model="file" style="display:none">

Html 文件正在服务器端作为 MultipartFile 处理。

提前致谢

Answer 1

您不需要创建输入元素。只需使用 API HTTPUploadAllThroughPostAsPDF 或 HTTPUploadThroughPostAsMultiPagePDF。在服务器端，您可以使用任何您喜欢的编程语言。

例如，ASP.NET：

<%@ Page Language="C#" %>

<%
    try
    {
        String strImageName;
        HttpFileCollection files = HttpContext.Current.Request.Files;
        HttpPostedFile uploadfile = files["RemoteFile"];
        strImageName = uploadfile.FileName;

        uploadfile.SaveAs(Server.MapPath(".") + "\\UploadedImages\\" + strImageName);

    }
    catch
    {
    }
%>

使用RemoteFile提取文件内容。

Answer 2

Dynamic Web Twain (DWT) 不会将捕获的图像提供给浏览器，因此浏览器可以将其用作输入字段。但我们必须将其上传到我们的服务器。 DWT 为此提供了许多功能。您可以使用以下任何满足您需求的产品-

FTP 功能：

• FTPUpload()
• FTPUploadAllAsMultiPageTIFF()
• FTPUploadAllAsPDF()
• FTPUploadAsMultiPagePDF()
• FTPUploadAllAsMultiPageTIFF()
• FTPUploadAllAsPDF()
• FTPUploadAsMultiPagePDF()
• FTPUploadAsMultiPageTIFF()
• FTPUploadDirectly()
• FTPUploadEx()

HTTP 函数：

• HTTPUploadAllThroughPostAsMultiPageTIFF()
• HTTPUploadAllThroughPostAsPDF()
• HTTPUploadThroughPost()
• HTTPUploadThroughPostAsMultiPagePDF()
• HTTPUploadThroughPostAsMultiPageTIFF()
• HTTPUploadThroughPostDirectly()
• HTTPUploadThroughPostEx()

你更清楚哪一个更适合你。例如，如果您想将所有图片上传为 PDF，并且喜欢使用 HTTP 发布请求，您应该使用 'HTTPUploadAllThroughPostAsPDF'。

DWObject.HTTPUploadAllThroughPostAsPDF(location.hostname, $POST_URL, 'my-test-file.pdf');

您可能需要与文件一起传递一些其他字段。在这种情况下，您可以使用“SetHTTPFormField”。这是上传图片为 PDF 的详细示例。

DWObject.SetHTTPFormField("field1", "field1 value");
DWObject.SetHTTPFormField("field2", "field2 value");
DWObject.IfSSL = ('https:' === location.protocol);
if (location.port != '') {
    DWObject.HTTPPort = location.port;
} else {
    DWObject.HTTPPort = (DWObject.IfSSL) ? 443 : 80;
}
DWObject.HTTPUploadAllThroughPostAsPDF(location.hostname, $POST_URL, 'my-test-file.pdf');