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Data is stored on optical discs in the form of microscopic pits (see Figure 21) The space between two pits is called a land On writable discs, pits and lands are often referred to as marks and spaces Read-only discs are stamped in a molding machine from a liquid plastic such as polycarbonate or acrylic and then coated with a reflective metallic layer Writable discs are made of material designed to be physically changed by the heat of a laser, creating marks As the disc spins, the pits (or marks) pass under a reading laser beam and are detected according to the change they cause in the intensity of the beam These changes happen very fast (over 980,000 times per second on Blu-ray Discs) and create a stream of transitions spaced at varying intervals: an encoded digital signal Figure 21 Optical Disc Pits

This program prints hello backward on the screen:

// Initiate drag and drop pnlPhoto.DoDragDrop(data, DragDropEffects.Copy); } }

#include <stdioh> #include <stringh> char s[] = "hello"; int main(void) { strrev(s); printf(s); return 0; }

This code begins a drag and drop operation that can be received by any other application running on the computer. Other applications look at the provided data formats to identify whether they can accept the dragged data. We will look at how to do this in Windows Forms in a moment. Of course, for applications that can receive multiple formats, the result they receive depends on which format they prefer. Most word processing applications look for the Text format first, and will therefore receive the Caption property of our photo, rather than the associated file object. Compile and run the application. Display an album and click on the image. Hold the mouse and drag it to a new location to perform a drag and drop operation. Figure 18.3 shows the result of dragging one of our favorite images from the MyPhotos application into a Microsoft Paint application. The Paint application opens the given file and displays a copy of the image in its main window. Also try dragging an image into WordPad or some other word processor to see how the caption string appears.

strset( )

3Ironically, digital data is stored on analog media The pits and lands on a DVDor a BD are not of a uniform depth and length, and they do not directly represent ones and zeros They produce a waveform of reflected laser light that represents coded runs of zeros and transition points Digital tape recordings use the same magnetic recording medium as analog tapes Digital connections between AV components (digital audio cables, HDMI cables, etc) encode data as square waves at analog voltage levels However, in all cases, the digital signal threshold is kept far above the noise level of the analog medium so that variations do not cause errors when the data is retrieved

char *strset(char *str, int ch)

Figure 18.3 The FileDrop format used here to drag an image into Microsoft Paint is a common method for transferring files between applications.

The prototype for strset( ) is found in <stringh> The strset( ) function is not defined by the ANSI/ISO C/C++ standard The strset( ) function sets all characters in the string pointed to by str to the value of ch It returns str

This completes our example for initiating a drag and drop operation. The next topic is to handle drag and drop operations within the MainForm window. 18.3.2 RECEIVING DRAG AND DROP Regardless of where a drag and drop operation originates, an application can elect to handle the incoming data. The DragEnter and DragDrop events are used to receive such operations. Event handlers for both of these events receive a DragEventArgs object as their event parameter. A summary of this object appears in .NET Table 18.4.

To help put the burning process in perspective, consider that at 16x DVD recording speeds a disc makes 10,800 rotations per minute, corresponding to a linear velocity of 56 meters per second (over 200 km/h), while marks are burned with a precision of less than 005 micrometer!

strset(str, 'x');

strnset( )