read pdf file in asp.net c#

read pdf file in asp.net c#

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For all of these reasons, well-designed user-facing POST forms always redirect to a page that shows the result of the action, and this page can be safely bookmarked, shared, stored, and reloaded. This is an important feature of modern browsers: if a POST results in a redirect, then pressing the reload button simply refetches the final URL and does not reattempt the whole train of redirects that lead to the current location! The one exception is that an unsuccessful POST should immediately display the form again, with its fields already filled out do not make the user type everything again! and with their errors or omissions marked, so that the user can correct them. The reason that a redirect is not appropriate here is that, unless the POST parameters are saved somewhere by the web server, the server will not know how to fill out the form (or what errors to flag) when the GET arrives a few moments later from the redirected browser. Note that early browsers interpreted a 302 response inconsistently, so code 303 was created to unambiguously request the right behavior in response to a POST. There seems to be fear among some web developers that some ancient browsers might not understand 303; however, I have never actually seen any specific browsers named that are still in use that will not interpret this more-correct HTTP response code correctly.

The QDir class is the key to handling paths and drives in Qt applications. When specifying paths to a QDir object, the slash (/) is used as a separator and is automatically converted to whatever separator is used on the current platform. Drive letters are allowed, and paths starting with a colon (:) are interpreted as references to resources embedded into the application. The QDir static methods make it possible to easily navigate the file system. First, QDir::current() returns a QDir that refers to the application s working directory. QDir::home() returns a QDir for the user s home directory. QDir::root() returns the root, and QDir::temp() returns the directory for temporary files. QDir::drives() returns a QList of QFileInfo objects, representing the roots of all the available drives.

Technorati s API returns results in its own proprietary XML format as well as common feed formats such as RSS. Clicking the API tab in the Development Center takes you to the documentation for Technorati s API, consisting of several operations.

Almost none of the caveats given in the last two sections apply when an HTTP POST is designed for consumption by a program other than a web browser This is because all of the issues that hinge upon user interaction, browser history, and the reload and back buttons will simply not apply To begin with, a POST designed for use by a program need not use the awkward x-www-formurlencoded data format for its input parameters Instead, it can specify any combination of content type and input data that its programmer is prepared for it to handle Data formats like XML, JSON, and BSON are often used Some services even allow entire documents or images to be posted raw, so long as the request Content-Type: header is set to correctly indicate their type.

Note Unix systems are considered to have a single drive /, whereas a Windows machine's drive space

The next common difference is that API calls made through POST rarely result in redirection; sending a program to another URL to receive the result of such calls (and thus requiring the client to make a second round-trip to the server to perform that download) only makes sense if the whole point of the service is to map requests into references to other URLs Finally, the range of payload content types returned from API calls is much broader than the kinds of data that can usefully be returned to browsers Instead of supporting only things like web pages, style sheets, and images, the programs that consume web APIs often welcome rich formatted data like that supported by formats like XML and JSON.

QFileInfo objects are used to hold information about files and directories. It has a number of useful methods, some of which are listed here:

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