Simple .NET/ASP.NET PDF document editor web control SDK

the pointer forward by a certain offset or move the pointer to a certain position backwards from the end of the file, you need to use seek. seek has three modes of operation: IO::SEEK_CUR IO::SEEK_END Seeks a certain number of bytes ahead of the current position. Seeks to a position based on the end of the file. This means to seek to a certain position from the end of the file you ll probably need to use a negative value. Seeks to an absolute position in the file. Identical to pos=.

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Therefore, to position the file pointer 5 bytes from the end of the file and change the character to an X, you would use seek as follows:

Although the headlines are hidden in the Figure 9-25 examples, the visual power of the images is clear. The Setting slide (upper left) features a photo of a clockwork from iStockphoto with a simple text box added that reads Product Launch A to illustrate the hidden headline Product Launch A went like clockwork. The Role slide (upper right) features the same clockwork photo with a text box in the same position that reads Product Launch B, referring to the headline You d like to make sure Product Launch B goes just as smoothly. Instead of the text boxes here, you could use the logos of the products.

Note Notice that because you re writing to the file, you use the r+ file mode to enable writing as well as

Or you could do this to print every fifth character in a file:

The Point A slide (lower left) features the iStockphoto graphic of three gears and a text box with a question mark to illustrate the headline You haven t had a chance since last quarter to examine how things are working here. On the Point B slide (lower right), the same photo now includes three arrows created with the PowerPoint drawing tools to illustrate You d like to be con dent things are working smoothly.

Note Unless you know what you re doing, you might want to avoid such mixing. It is generally used when

Finding Out When a File was Last Modified To establish when a file was last modified, use File.mtime:

puts File.mtime("text.txt")

Next, insert three callouts with the numbers 1, 2, and 3 on the Call to Action slide next to each gear and arrow, as shown on the upper left in Figure 9-26 when the slide appears, you will verbally explain that there are three reasons why your manager should

Fri Jan 11 18:25:42 2007

The time is returned as a Time object, so you can get more information directly:

For example, our hello function might require a name, but allow us to (optionally) specify the greeting and the punctuation: def hello_4(name, greeting='Hello', punctuation='!'): print '%s, %s%s' % (greeting, name, punctuation) This function can be called in many ways. Here are some of them:


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Checking If a File Exists It s useful to check whether a file actually exists, particularly if your program relies on that file or if a user supplied the filename. If the file doesn t exist, you can raise a user-friendly error or exception. Invoke the File.exist method to check for the existence of a file:

Be assured we will meet our goals, as described in the hidden headline. Then, on the rst Key Point slide (upper right), use only the photo and add one arrow to illustrate the rst Key Point headline, We accomplished what we said we would. The Act II slides that will follow this slide in the presentation will provide the breakdown and backup for these accomplishments. Then, on the second Key Point slide (lower left), add a second arrow and the second Key Point headline, We are on track to accomplish our new goals. The following Act II slides will provide the breakdown and backup for your new goals. Then, on the third Key Point slide (lower right), add the third and nal arrow and the third headline, We will overcome our challenges. The following Act II slides will provide the breakdown and backup for how you will overcome those challenges. When you create your custom layouts for your Explanation (Breakdown) and Detail (Backup) slides, add a small version of the gears to the navigation bar to carry the visual theme through the presentation on those slides.

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