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The principle of making a Qt plugin is the same regardless of the type of extension the plugin actually provides. To understand how to extend Qt and how the interaction between Qt, the plugin, and the application work, you ll have a look at an image format plugin. The plugin will save the images as ASCII art, in which each pixel is converted into a character (an example is shown in Figure 11-1). This is something of a lost art, but it was quite common back in the 1980s and early 1990s. Before you start looking at the plugin, you should see how Qt loads and saves images. The general idea is to use the save and load methods from the QImage class. (Instead of using load you can specify the file name in the constructor of QImage it does the same thing.) The QImage class uses a QImageReader class when it loads images. QImageReader checks to see whether there is a QImageIOPlugin that can read the given image. When a plugin is found, it is asked to return a QImageIOHandler that the QImageReader then uses to actually read the image. When writing, the process is about the same, but the file format is not determined from the file but has to be specified when calling save. QImage passes it onto the QImageWriter class that asks whether there is a QImageIOPlugin that can save in the given format. When found, the QImageIOPlugin returns a QImageIOHandler that the QImageWriter uses to actually write the image to a device, usually a file.

NET Framework version 1 or 11, the function will have the following signature: public static object doNothing(object x) This means if you are creating a library for use with the NET Framework version 1 or 11, the users of your functions from other NET languages will have to cast the object returned to its original type They would not have to do this if using a version of the library compiled for the NET Framework 2 The other problem area is arrays, because these were pseudogeneric in the NET Framework versions 1 and 11 and fully generic in the NET Framework 2 For those of you not familiar with the NET Framework version 1 or 11, pseudogeneric means that arrays in the NET Framework version 1 or 11 could have a type parameter, but nothing else could For example, the method GetFiles from the System.

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the program, and the data that you re running on, fit in 32K. A screenshot of VisiCalc doesn t fit in 32K nowadays. The Apple II only had 48K max. So this program launched in 48K, and you re going to put in a help When Lotus launched with their help system, it was a separate disk that you put in that had the whole system in it.

... QFile file( "test.dat" ); if( !file.open( QIODevice::WriteOnly ) ) return; QDataStream stream( &file ); stream.setVersion( QDataStream::Qt_4_2 ); stream << list; file.close(); Loading the serialized data back is just as easy as serializing it. Simply create a destination object of the right type; in this case, use QList<ColorText>. Open a file for reading and then create a data stream. Ensure that the data stream uses the right version and reads the data from the stream using the >> operator. In Listing 8-8, you can see that the data is loaded from a file, and the contents of the freshly loaded list are dumped to the debug console using qDebug from a foreach loop. Listing 8-8. Loading a list of ColorText items QList<ColorText> list; QFile file( "test.dat" ); if( !file.open( QIODevice::ReadOnly ) ) return; QDataStream stream( &file ); stream.setVersion( QDataStream::Qt_4_2 ); stream >> list; file.close(); foreach( ColorText data, list ) qDebug() << data.text << "(" << data.color.red() << "," << data.color.green() << "," << data.color.blue() << ")";

Livingston: Didn t Lotus design 1-2-3 with the IBM in mind Bricklin: It ran in 256K or maybe 128 I don t remember but you had to

have an extra disk in the drive if you wanted help, as I recall Just think about it: if a help screen has a thousand characters and you re going to have 10 help screens, there goes 10K! Where are you going to fit it when you only have 20K of memory for the whole sheet How much are you willing to give So I printed a reference card up, which my father actually helped me do my father s printing business typeset and printed that whole thing for us An awful lot of people learned the product from the reference card It had the ability to lock because, remember, you had a very small screen, 40 characters by 24/25 lines on the Apple II it allowed you to lock columns or rows on the screen They call them panes now, I think, in Excel; you could lock the panes.

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