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You just ran your code in the test harness successfully the first time! Unfortunately, that is not likely to happen all the time. Nobody is perfect, so you need to know how to fix problems with your code. Fortunately, VWD has powerful debugging capabilities that you can use. The test harness doesn t have this capability. Errors can be displayed, but they won t help you much. Apparently, the Popfly team didn t spend a lot of time building a robust error reporting functionality. Errors like Object unidentified or Object not found don t help you track down where the problem is. To display errors in the test harness anyway, check the Show errors here check box. The first thing you need to do to debug your code using VWD is to enable debugging in Internet Explorer. You can do that by selecting Tools Internet Options. Click the Advanced

-- Anonymous --===============1623374356== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="test.txt" This is a test --===============1623374356== Content-Type: application/octet-stream MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="test.txt.gz" H4sIAP3o2D8AAwvJyCxWAKJEhZLU4hIuAIwtwPoPAAAA --===============1623374356==-The message starts off looking quite similar to the traditional ones we created earlier; you can see familiar headers like To, From, and Subject just like before. Note the Content-Type line, however: it indicates multipart/mixed. That tells the mail reader that the body of the message contains multiple MIME parts, and that the string containing equals signs will be the separator between them. Next comes the message s first part. Notice that it has its own Content-Type header! The second part looks similar to the first, but has an additional Content-Disposition header; this will signal most e-mail readers that the part should be displayed as a file that the user can save rather than being immediately displayed to the screen. Finally comes the part containing the binary file, encoded with base-64, which makes it not directly readable.

Note A dynamic link library can also be referred to as a shared library (as well as a DLL).

MIME alternative parts let you generate multiple versions of a single document. The user s mail reader will then automatically decide which one to display, depending on which content type it likes best; some mail readers might even show the user radio buttons, or a menu, and let them choose. The process of creating alternatives is similar to the process for attachments, and is illustrated in Listing 12 10. Listing 12 10. Writing a Message with Alternative Parts #!/usr/bin/env python # Foundations of Python Network Programming - 12 - mime_gen_alt.py # This program requires Python 2.2.2 or above from email.mime.base import MIMEBase

When you want to build support of plugins designed for other applications or earlier non Qt-based versions of your application, it is important to know how to handle plugins at a lower level. This section shows you how it s done and how Qt can be used to access plugins that were designed for other applications or by using other tools.

from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email import utils, encoders def alternative(data, contenttype): maintype, subtype = contenttype.split('/') if maintype == 'text': retval = MIMEText(data, _subtype=subtype) else: retval = MIMEBase(maintype, subtype) retval.set_payload(data) encoders.encode_base64(retval) return retval

Figure 11-7. A Qt image format plugin seen from the Dependency Walker Let s have a look at the source code of the trivial library that you ll interface. Listing 11-35 shows the implementation of the sum function. All the function does is calculate a checksum for a given data stream. Listing 11-35. The sum function in all its glory int sum( int len, char *data ) { int i; int sum = 0x5a; for( i=0; i<len; ++i ) sum ^= data[i]; return sum; } On the Windows platform I used the custom Makefile shown in Listing 11-36 to build a DLL. If you use another platform, you should change the file extension of the resulting file (sum.dll in the file shown in the listing). On Unix the extension usually is .so, and on Mac OS

The interactive technologies are used to create custom dynamic behavior like showing or hiding content, dragging and dropping of content, and animations. Without interactivity in web pages, you are left with bland, static uninspired functionality that doesn t provide the same robust interaction that a desktop application provides.

messagetext = """Hello, This is a *great* test message from 12. I hope you enjoy it!

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