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http://blog.csdn.net/noah1987/archive/2008/10/21/3118934.aspx
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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£¬ÏÂÃæµÄ¼Æʱ»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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Void foo(void)
{
unsigned int a = 6;
int b = -20;
(a+b > 6) £¿puts("> 6") : puts("<= 6");
}
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