Symptom:

When you upload images using the HTTPUploadThroughPost*** method, you may receive the following error messages:



Cause:

1. The write permission is not granted to the specified directory of web server.

2. The action page is incorrect or returns something from Web server.

Dynamic Web TWAIN uses a special way to see if an image is uploaded and processed successfully by server. If the server returns 0 byte, 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.

Resolution:

Please check the response string returned from the HTTP server. The response string can help you figure out the cause of the process error. You can get this string by using the HTTPPostResponseString property. Click here for more information about the property.

Also, you can send the screenshot of the response string to twainsupport@dynamsoft.com.