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Visual Studio .NET Ames code simplescan.c in VS .NET Drawer PDF 417 in VS .NET simplescan.c

Example 3.1 simplescan.c Using Barcode creation for .NET Control to generate, create 2 of 7 Code image in VS .NET applications..NET Codabar for C# #include #include #include #include #include #include #include interleaved 25 < s t d i o . h> < s t d l i b . h> < u n i s t d .

h> < s y s / s o c k e t . h> < b l u e t o o t h / b l u e t o o t h . h> < b l u e t o o t h / h c i .

h> < b l u e t o o t h / h c i l i b . h>. int main ( int argc , char * 2 of 7 Code for Visual C# * argv ) { inquiry info * devices = NULL ; int max rsp , num rsp ; int adapter id , sock , len , flags ; int i ; char addr[19] = { 0 } ; char name[248] = { 0 } ;. C Programming With GNU/Linux adapter id = h c i g e t r o Codabar for C# u t e ( NULL ) ; sock = h c i o p e n d e v ( adapter id ) ; if ( adapter id < 0 . sock < 0) { perror ( " opening socket " ) ; exit ( 1 ) ; } len = 8 ; max rsp = 255; flags = IREQ CACHE FLUSH ; devices = ( inquiry info * ) malloc ( max rsp * sizeof ( inquiry info ) ) ; num rsp = h c i i n q u i r y ( adapter id , len , max rsp , NULL , &devices , flags ) ; if ( num rsp < 0 ) perror ( " hci inquiry " ) ; for ( i = 0 ; i < num rsp ; i++) { b a 2 s t r (&(devices+i) >bdaddr , addr ) ; memset ( name , 0 , sizeof ( name ) ) ; if (0 != h c i r e a d r e m o t e n a m e ( sock , &(devices+i) >bdaddr , sizeof ( name ) , name , 0 ) ) { strcpy ( name , "[unknown] " ) ; } printf ( "%s %s\n" , addr , name ) ; } free ( devices ) ; c l o s e ( sock ) ; return 0 ; }. Compiling the Example To com .NET framework Ames code pile our program, invoke gcc and link against libbluetooth:. # gcc o s i m p l e s c a n s i m p l e s c a n . c l b l u e t o o t h Bluetooth Essentials for Programmers Representing Bluetooth Addresses typedef struct { uint8 t b [ 6 ] ; } attribute ( ( packed ) ) bdaddr t ; . The basic data structure use USD-4 for Visual C# d to specify a Bluetooth device address is a packed array of 6 bytes, and referred to as bdaddr t. All Bluetooth addresses in BlueZ will be stored and manipulated as bdaddr t structures. Two convenience functions, str2ba and ba2str, can be used to convert between strings and bdaddr t structures.

. int s t r 2 b a ( const char * str , bdaddr t * ba ) ; int b a 2 s t r ( const bdaddr t * ba , char * str ) ; . The function str2ba takes a Codabar for C#.NET string of the form XX:XX:XX:XX:XX:XX, where each XX is a hexadecimal number specifying 1 byte of the 6-byte address, and packs it into a bdaddr t. The function ba2str does exactly the opposite.

Choosing and Opening a Local Bluetooth Adapter Local Bluetooth adapters are assigned identifying numbers starting with 0, and a program must specify which adapter to use when allocating system resources. Usually, there is only one adapter or it doesn t matter which one is used, so passing NULL to hci get route will retrieve the resource number of the rst available Bluetooth adapter:. int hci get route ( bdaddr t * addr ) ; . This function actually retur Ames code for Visual C# ns the resource number of any adapter whose Bluetooth address does not match the one passed in as a parameter, so by passing in NULL, the program essentially asks for any available adapter. If there are multiple Bluetooth adapters present, and we know which one we want, then we can use hci devid:. int h c i d e v i d ( const char * addr ) ;. Unlike its counterpart, hci VS .NET Ames code devid returns the resource number of the Bluetooth adapter whose address matches the one passed in as a parameter. This is one of the few places where a BlueZ function uses a string representation to work with a Bluetooth address instead of a bdaddr t structure.

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