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The support for image files has been steadily improving with each new development environment from Microsoft, and the .NET Framework is no exception. While the .NET classes do not provide all the functionality you might like (as we shall see), it does provide a number of improvements over the previous support provided by the MFC (Microsoft Foundation Class) library. One of them is the PictureBox control to make image display a little easier. All we have to do is set the Image property to a bitmap image and the framework takes care of the rest. Our friend, the new keyword, creates the Bitmap. Once again, we see how garbage collection makes our life easier. In C++, the memory allocated for this Bitmap would need to be tracked and eventually freed with a call to delete. In C#, we create the object and forget about it, relying on the garbage collector to clean it up when a new image is loaded by the OnLoadClicked method and the existing Bitmap replaced. The OpenFileDialog class provides a couple of ways to access the selected file. The FileName property retrieves the path to the selected file. In our code, we opt for the OpenFile method to open this file with read-only permission. The open file is passed to the Bitmap constructor to load the image. The constructed bitmap is assigned to the Image property of our pboxPhoto variable. This property can hold any object which is based on the Image class, including bitmaps, icons, and cursors. How this image appears within the picture box control depends on the PictureBox.SizeMode property. In our case, we set this property so that the image is shrunk and/or expanded to fit the boundaries of the PictureBox control.

The prototype for isalpha( ) is found in <ctypeh> The isalpha( ) macro returns non-0 if ch is a letter of the alphabet (upper- or lowercase); otherwise, it returns 0

The initialism HD can refer to both high definition and high density This book generally uses HD for high definition, which should be clear from the context

This program checks each character read from stdin and reports all those that are letters of the alphabet:

pboxPhoto.SizeMode = PictureBoxSizeMode.StretchImage;

#include <ctypeh> #include <stdioh> int main(void) { char ch; for(;;) { ch = getchar(); if(ch==' ') break; if(isalpha(ch)) printf("%c is a letter\n", ch); } return 0; }

TRY IT!

2:

There are basically two mutually incompatible standard-definition television recording systems in common use around the world One system uses 525 lines scanned at 60 fields per second with NTSC color encoding and is used primarily in Japan and North America The other system uses 625 lines scanned at 50 fields per second with PAL or SECAM color encoding and is used in most of the rest of the world This book generally uses the technically correct terms of 525/60 (simplified from 525/5994), and 625/50, but also uses the terms NTSC and PAL in the generic sense When the world moved to high-definition the number of scan lines were standardized at 720 and 1080, but there are still two common frame rates of 50 Hz and 60Hz that vary among regions In addition, the film frame rate of 24 Hz has become common for both encoding and display This book uses terms 720p and 1080p to refer to progressive-scan picture formats regardless of frame rate, and 1080i to refer to the interlaced variation Terms such as 720/30p, 1080/24p, and 1080/30i are used when more precision is needed The number after the slash is always the frame rate, not the field rate, to avoid confusion caused by sloppy notation such as 60i or 50i that all careful writers should eschew

If you re feeling slightly adventurous, you should now be able to add a second Button and second PictureBox to the form. Label the second button Load2 and implement an OnLoad2Click event handler that loads a second image into the second PictureBox control. As an alternate modification, change the Main method to receive the array of command-line arguments passed to the program in an args variable. Load the first parameter in args[0] as a Bitmap object and assign it to the PictureBox control for the MyForm class. To do this, you will need to add a new constructor to the MyForm class that receives the name of an image file.

THEN the second is converted to long double ELSE IF an operand is a double THEN the second is converted to double ELSE IF an operand is a float THEN the second is converted to float ELSE IF an operand is an unsigned long THEN the second is converted to unsigned long ELSE IF an operand is long THEN the second is converted to long ELSE IF an operand is unsigned int THEN the second is converted to unsigned int There is one additional special case: If one operand is long and the other is unsigned int, and if the value of the unsigned int cannot be represented by a long, both operands are converted to unsigned long Once these conversion rules have been applied, each pair of operands is of the same type, and the result of each operation is the same as the type of both operands For example, consider the type conversions that occur in Figure 2-1 First, the character ch is converted to an integer Then the outcome of ch/i is converted to a double because f * d is double The outcome of f + i is float, because f is a float The final result is double