how to edit pdf file in asp.net c#

how to edit pdf file in asp.net c#

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You could pipe the file through sed and then redirect the sed output to another file; once the output has been validated, you could move the modified file back into place and either overwrite the original or, more conservatively, back up the original file to another location before replacing it with the modified version The alternate method discussed here carries a little more risk because the original file itself is modified There is a chance that the system will crash during the editing process for reasons not related to editing Disk failures do occur on occasion, and it is also possible that another user might be modifying the file at the same time that you make changes of your own, or simply that your modification is incorrect and isn t validated.

Knowing that you can bring all of these formats into Flash and that MP3 is the output format for Flash is all well and good. But how do they get into Flash, and, more importantly, how does an AIFF or WAV file get converted to an MP3 file when it plays in Flash Let s explore that right now starting with an import.

To see what happens when you import an audio file, open a new Flash document, and import PreachersAndThieves.aif (in the Exercise folder for this chapter) to the Library. Because of the unique manner in which sound files are added to a Flash movie, they simply cannot be imported to the stage.

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The upside is that editing files with ed works well and there isn t any need to create temporary files while modifications are in progress, although you may want to back up the original files for safety The procedure in this chapter uses the ed utility to modify files in place ed is not a fullscreen interactive editor, and any modification you want to perform on a file needs to be specified by an ed command These commands include moving to specific locations in a file, searching and replacing, inserting and deleting data, and so on When you script the use of ed, you first create a file containing all the modification commands you want to apply to the target file Once that command file is created, you then apply all the commands at once to the target file.

Once rare, you don t have to look far on the Internet to find a plethora of sites with slide show elements in them. In addition to large photo-sharing sites, many smaller sites now allow their users to create custom slide shows. With the ASP.NET AJAX SlideShow extender, you too could easily add a simple slide show to your site. This extender uses a web service

If you select Import to Stage when importing an audio file, it won t be placed on the stage. Instead, it will be placed directly into the Library.

When you open the Library and select the file, you will see the file s waveform in the preview area, as shown in Figure 5-2. You can click the Play button, which is the triangle located above the waveform in the preview area, to test the sound file.

To set the sound properties for an audio file, double-click the speaker icon next to the audio file s name in the Library. Figure 5-3 shows the Sound Properties dialog box for PreachersandThieves.mp3.

This discussion will focus mainly on performing search-and-replace commands, plus a couple of other types of edits The ed editor can do much more than what I m going to suggest here, but this chapter will give you a good start on this style of editing..

Figure 5-3. The Sound Properties dialog box is opened when you double-click an audio file in the Library.

CHAPTER 8 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 2)

This dialog box is a really useful tool. You can use it to preview and stop an audio file: click the Test button to preview the sound file, and then click the Stop button to stop the sound playback. The Update button is also handy. If an audio file has been edited after being placed into Flash, you can click the Update button to replace the imported copy with the edited version as long as its original location on your hard drive hasn t changed since the file was imported. If the file has moved, use the Import button to find it again, or replace this Library asset with a new file.

The following code is the simplest example. It shows the contents of a file named ed.script that contains an ed script consisting of a single search-and-replace command:

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