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http://blog.csdn.net/noah1987/archive/2008/10/21/3118934.aspx
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È·ÈÏ·½·¨£ºcat /etc/sndstat£¬Èç¹ûÏÔʾÎÞ´ËÉ豸£¬ÔòûÓа²×°Çý¶¯¡£
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#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <linux/soundcard.h>
/* ÏÂÃæµÄÈý¸ö²ÎÊýÊǸú¾ßÌåÎļþÏà¹ØµÄ£¬ÎļþʲôÑù£¬¾ÍÒªÉèÖóÉʲôÑù */
#define RATE 11025  
#define SIZE 16    
#define CHANNELS 1  // 1±íʾµ¥ÉùµÀ£¬2ΪÁ¢ÌåÉù
/* ................ */
unsigned 
char
 buf[RATE*SIZE/8]; //bufÀïÃæÕýºÃ·ÅÒ»ÃëÖÓµÄÒôƵ£¬ÏÂÃæµÄ¼ÆÊ±»¹ÒªÓÃ
int
 main()
{
    int
 fd;
    int
 wavfd; //wavÎļþµÄÃèÊö·û
    int
 arg;        
/* ..ioctl..... */
    int
 status;   
/* ........ */
                
/* ...... */
    fd = open(
"/dev/dsp"
, O_RDWR
);      
    if
 (fd < 0) {
        printf(
"open of /dev/dsp failed"
);
        exit(1);
}
    wavfd = open(
"12193767609.wav"
,O_RDONLY);
    if
 (wavfd < 0) {
        printf(
"open of wav failed"
);
       


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Logical Link Control and Adaptation Protocol(L2CAP)
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Void foo(void)
{
unsigned int a = 6;
int b = -20;
(a+b > 6) £¿puts("> 6") : puts("<= 6");
}
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