TWAIN ActiveX/Plug-in HTTP Control/SDK

HTTPUploadThroughPostEx Method

Description

Uploads the image of a specified index in buffer to the HTTP server as a specified image format through HTTP POST method.

Syntax

Boolean ObjectName. HTTPUploadThroughPostEx(String HTTPServer, Short sImageIndex, String ActionPage, String FileName, Long ImageType)

Parameters

String HTTPServer: the name of the HTTP server.

Short sImageIndex: specifies the index of image in buffer. The index is 0-based.

String ActionPage: the specified page for posting image files. This is the relative path of the page, not the absolute path. For example: "upload.asp", not "http://www.webserver.com/upload.asp". This is the page corresponds to the action in <form> html tag: <form id = "frmSample" action = "upload.asp" method = post>...</form>

String FileName: the name of the image to be uploaded.

Long ImageType: the image format of the file to be created on the HTTP server.

Return value

Boolean.

TRUE indicates success. FALSE indicates failure.

When an error occurs and IfThrowException property is TRUE, an exception will be thrown.

When FALSE is returned or an exception is thrown, check ErrorCode property and ErrorString property for error information.

Remarks

Dynamic Web TWAIN processes the image format according to the value of the ImageType.

Allowed Values	ImageType
0	BMP
1	JPEG
2	TIFF
3	PNG
4	PDF

The field name of the uploaded image is RemoteFile.

IMPORTANT: Dynamic Web TWAIN uses a special way to see if an image is uploaded and processed successfully by server. If the server returns 0 bytes, indicates success. Otherwise, indicates failure. In other words, when the uploaded image is processed successfully, the action page on the server should not return anything, even the "<html>".

Sample

A simple JSP sample is provided. Should you need sample in other languages, please access the following page to download samples.
https://www.dynamsoft.com/Secure/RegisterInfo_sample.aspx

JSP Sample:

Snippet in Scan.jsp:

...

<script language="javascript">
function btnScan_onclick() 
{
	frmScan.DynamicWebTwain1.SelectSource();
	frmScan.DynamicWebTwain1.AcquireImage();
}
function btnUpload_onclick() 
{
	var strActionPage;
	var strHostIP;

	var CurrentPathName = unescape(location.pathname); // get current PathName in plain ASCII 
	var CurrentPath = CurrentPathName.substring(0, CurrentPathName.lastIndexOf("/") + 1); 
	strActionPage = CurrentPath + "SaveToFile.jsp"; //the ActionPage's file path 

	frmScan.DynamicWebTwain1.HTTPPort = 80; 
	frmScan.DynamicWebTwain1.HTTPUploadThroughPostEx("127.0.0.1", 0, strActionPage, "imageData.jpg", 1);

	if (frmScan.DynamicWebTwain1.ErrorCode != 0)
		//alert(frmScan.DynamicWebTwain1.ErrorString);
		alert(frmScan.DynamicWebTwain1.HTTPPostResponseString);
	else //succeded
} 
</script>

...

SaveToFile.jsp:

<%@ page language="java" import="java.io.*"%>

<%
	String contentType = request.getContentType();

	if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0)) 
	{
		DataInputStream in = new DataInputStream(request.getInputStream());
		int formDataLength = request.getContentLength();
		byte dataBytes[] = new byte[formDataLength];
		int byteRead = 0;
		int totalBytesRead = 0;

		while (totalBytesRead < formDataLength) 
		{
			byteRead = in.read(dataBytes, totalBytesRead, formDataLength);
			totalBytesRead += byteRead;
		}

		in.close();

		String file = new String(dataBytes); 
		String saveFile = file.substring(file.indexOf("filename=\"") + 10); 
		saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
		saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1,saveFile.indexOf("\""));

		int lastIndex = contentType.lastIndexOf("=");
		String boundary = contentType.substring(lastIndex + 1, contentType.length());
		int pos;

		pos = file.indexOf("filename=\"");
		pos = file.indexOf("\n", pos) + 1;
		pos = file.indexOf("\n", pos) + 1;
		pos = file.indexOf("\n", pos) + 1;

		int boundaryLocation = file.indexOf(boundary, pos) - 4;
		int startPos = ((file.substring(0, pos)).getBytes()).length;
		int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;

		File fileToRecv = new File(application.getRealPath("/") + saveFile);

		if(!fileToRecv.exists())
		{
			fileToRecv.createNewFile();
		}
		FileOutputStream fileOut = new FileOutputStream(fileToRecv);

		fileOut.write(dataBytes, startPos, (endPos - startPos));

		fileOut.flush();
		fileOut.close();
	}
%>