在Win9x中，请问哪一个VC函数能让电脑小喇叭发不同的声音？（内空）

[masonwy]

empty

[Holly]

Beep(DWORD dwFreq, DWORD dwDuration)
可指定声音频率和时间长度以产生不同的声音！

[Holly]

Beep(DWORD dwFreq, DWORD dwDuration);
可以指定声音频率和长度，以产生不同的声音！

[sxbyl]

Holly是对的，MSDN上写得很清楚，如下：
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winbase.h.
Import Library: Use kernel32.lib.

[ad]

coolcode说得对，请看msdn的说明：
Remarks
Windows 95: The Beep function ignores the dwFreq and dwDuration parameters. On computers with a sound card, the function plays the default sound event. On computers without a sound card, the function plays the standard system beep.

请用我的beep函数:
void OutPort(short _port,char _byte)
{
_asm {
mov dx, _port
mov al, _byte
out dx, al
}
}

void InPort(short _port,char *_byte)
{
_asm {
mov dx, _port
in al, dx
mov byte ptr _byte, al
}
}

/* Sounds the speaker for a time specified in microseconds
* by duration at a pitch specified in hertz by frequency.
*/
void MyBeep( unsigned short frequency, unsigned short duration )
{
char control;
InPort( 0x61, &control);
/* If frequency is 0, Beep doesn't try to make a sound. */
if( frequency )
{
/* 75 is about the shortest reliable duration of a sound. */
//if( duration < 75 )
// duration = 75;
/* Prepare timer by sending 10111100 to port 43. */
//_outp( 0x43, 0xb6 );
/* Divide input frequency by timer ticks per
* second and write (byte by byte) to timer.
*/
frequency = (unsigned)(1193180L / frequency);
OutPort( 0x42, (char)frequency );
OutPort( 0x42, (char)(frequency >> 8) );
/* Save speaker control byte. */
/* Turn on the speaker (with bits 0 and 1). */
OutPort( 0x61, control | 0x3 );
}
if(duration>0){
Sleep( duration ); /*可以用MySleep代替 */
/* Turn speaker back on if necessary. */
if( frequency )
OutPort( 0x61, control );
}
else if(frequency==0)
OutPort( 0x61, control & 0xfc);
}

/* Pauses for a specified number of microseconds. */
/*void MySleep( clock_t _wait )
{
clock_t goal;
goal = _wait + clock();
while( goal > clock() )
;
}
*/

[Holly]

Beep()在WINDOWS95下确实只有固定的声音！改为MessageBeep()如何！

[coolcode]

错,Beep(...)在Win95下只发出同样的声音.
此时可能需要直接读写其端口，同DOS下相同.