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fsetpos( ), fseek( ), ftell( )

11:

char *fgets(char *str, int num, FILE *stream)

11.2.3 Binding notation and options Binding is used all over the place in WPF. It s used to get data, as we ve seen, but it s also used in tons of other things such as sizing (to bind the width of one control to the width of another control), animation (to get to the properties that are being animated), and control templates (to tie pieces of the template to specific properties). The great thing is that the binding notation is really flexible. The downside is that the binding notation is really flexible. WPF hasn t been out for very long. We suspect

10

The prototype for fgets( ) is found in <stdioh> The fgets( ) function reads up to num 1 characters from stream and places them into the character array pointed to by str Characters are read until either a newline or an EOF is received or until the specified limit is reached After the characters have been read, a null is placed in the array immediately after the last character read A newline character will be retained and will be part of str If successful, fgets( ) returns str; a null pointer is returned upon failure If a read error occurs, the contents of the array pointed to by str are indeterminate Because a null pointer is returned when either an error occurs or the end of the file is reached, you should use feof( ) or ferror( ) to determine what has actually happened

This program uses fgets( ) to display the contents of the text file specified in the first command line argument:

that, if all the time spent debugging and fixing bindings could be harnessed, we would have, as a species, solved global warming and world hunger, and figured out a way of getting your food delivered before the toast gets cold. The source of a binding can be broken down into two things: where the data is coming from and what bit of data you want from there. The where can be one of four different things (table 11.2).

#include <stdioh> #include <stdlibh> int main(int argc, char *argv[]) { FILE *fp; char str[128]; if((fp=fopen(argv[1], "r"))==NULL) { printf("Cannot open file\n"); exit(1); } while(!feof(fp)) { if(fgets(str, 126, fp)) printf("%s", str); } fclose(fp); return 0; }

Ethernet client device 10/100

fputs( ), fgetc( ), gets( ), puts( )

Table 11.2 Where the data comes from in a Binding Description You use Source when you want to bind to a particular object. Invariably, that object is defined as a resource, so the notation looks like this (from our ListView example):

long filelength(int handle)

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The prototype for filelength( ) is found in <ioh> The filelength( ) function is not defined by the ANSI/ISO C/C++ standard It returns the length, in bytes, of the file associated with the file descriptor handle Remember that the return value is of type long If an error occurs, 1L is returned and errno is set to EBADF, which means bad file handle

You use ElementName when you want to bind to a property on some other element in your UI. For example, if there were a control called someListBox and you wanted a TextBox to be the same color as the list box, you d write this:

This fragment prints the length of a file whose file descriptor is fd:

printf("The file is %ld bytes long", filelength(fd));

<TextBox Background= "{Binding ElementName=someListBox, Path=Background}" /> RelativeSource RelativeSource is used when you don t know the specific element you want to reference, but you know where that element is relative to where you are now that is, relative to the element that you re currently binding. There are several different modes for RelativeSource that control its behavior.

1

open( )

int fileno(FILE *stream)

Mode Behavior In this case, the RelativeSource is the first ancestor element that meets a particular condition. You can specify the ancestor you want based on how many levels up it is.

The prototype for the fileno( ) macro is found in <stdioh> The fileno( ) function is not defined by the ANSI/ISO C/C++ standard It is used to return a file descriptor to the specified stream

.

After this fragment has executed, fd is associated with the file pointed to by stream: