Beep The Beep function generates simple tones on the speaker. The function is synchronous; it does not return control to its caller until the sound finishes. BOOL Beep( DWORD dwFreq, // sound frequency DWORD dwDuration // sound duration ); Parameters dwFreq Windows NT/ 2000: [in] Specifies the frequency, in hertz, of the sound. This parameter must be in the range 37 through 32,767 (0x25 through 0x7FFF). dwDuration Windows NT/ 2000: [in] Specifies the duration, in milliseconds, of the sound. Return Values If the function succeeds, the return value is nonzero.If the function fails, the return value is zero. To get extended error information, call GetLastError. Res 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
我用的是Windows 2000 Server,编译器: error C2501: 'DWORD' : missing storage-class or type specifiers 。我试着包含Winnt.h和WINDEF.H,最终仍没解决。
Beep
The Beep function generates simple tones on the speaker. The function is synchronous; it does not return control to its caller until the sound finishes. BOOL Beep(
DWORD dwFreq, // sound frequency
DWORD dwDuration // sound duration
);
Parameters
dwFreq
Windows NT/ 2000: [in] Specifies the frequency, in hertz, of the sound. This parameter must be in the range 37 through 32,767 (0x25 through 0x7FFF).
dwDuration
Windows NT/ 2000: [in] Specifies the duration, in milliseconds, of the sound.
Return Values
If the function succeeds, the return value is nonzero.If the function fails, the return value is zero. To get extended error information, call GetLastError. Res
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
error C2501: 'DWORD' : missing storage-class or type specifiers
。我试着包含Winnt.h和WINDEF.H,最终仍没解决。
然后改project选项成多线程模式