private static int GetVolume()
{
int result = 0;
InvokeTryCatch("WinXpVolumeOperate.GetVolume", () =>
{
int currVolume;
int mixerControl;
WinXpDllInterface.mixerOpen(out mixerControl, 0, 0, 0, 0);
uint type = WinXpDllInterface.MIXERCONTROL_CONTROLTYPE_VOLUME;
InnerGetMixer(mixerControl, WinXpDllInterface.MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, type, out currVolume);
WinXpDllInterface.mixerClose(mixerControl);
result = currVolume;
});
return(result);
}
private static void SetVolume(int volume)
{
InvokeTryCatch("WinXpVolumeOperate.SetVolume", () =>
{
int currVolume;
int mixerControl;
WinXpDllInterface.mixerOpen(out mixerControl, 0, 0, 0, 0);
uint controlType = WinXpDllInterface.MIXERCONTROL_CONTROLTYPE_VOLUME;
WinXpDllInterface.MIXER mixer = InnerGetMixer(mixerControl, WinXpDllInterface.MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, controlType, out currVolume);
bool setSucceed = false;
for (int i = 0; i < 3; i++)
{
if (volume > mixer.lMaximum)
{
volume = mixer.lMaximum;
}
if (volume < mixer.lMinimum)
{
volume = mixer.lMinimum;
}
InnerSetMixer(mixerControl, mixer, volume);
mixer = InnerGetMixer(mixerControl, WinXpDllInterface.MIXERLINE_COMPONENTTYPE_DST_SPEAKERS, controlType, out currVolume);
if (volume == currVolume)
{
setSucceed = true; break;
} //如果设置失败, 则最多重试3次
}
WinXpDllInterface.mixerClose(mixerControl);
if (!setSucceed)
{
throw new Exception("多次尝试设置 Xp操作系统音量 失败 (该异常可能是偶发异常, 可以忽略)!");
}
});
}