speak完成如何判断?如何使用SpVoice.SpeakCompleteEvent,这个问题困扰了我两天,最后看到msdn上的例子才知道要使用WaitForSingleObject函数处理它返回的时间句柄,之前的想speak或者偏移量的是多么荒谬啊。
peech API 5.3
Object: SpVoice
Type: Hidden
- SpVoice.SpeakCompleteEvent() As Long
Return Value
A Long variable containing the event handle.
Example
- Dim objVoice As SpeechLib.SpVoice
- Dim lngHandle As Long
- Dim lngRtn As Long
- Const INFINITE = -1&
- Set objVoice = New SpVoice
- objVoice.Speak "please wait until this text has been spoken", SVSFlagsAsync
- lngHandle = objVoice.SpeakCompleteEvent 'Get a handle on this stream
- lngRtn = WaitForSingleObject(lngHandle, INFINITE) 'Wait for completion
一开始用 if WaitForSingleObject(SpVoice.SpeakCompleteEvent, INIFINTE) = WAIT_OBJECT_0 then判断发现当朗读时它会一直读下去,界面上按钮都不能点,
就改成WaitForSingleObject(SpVoice.SpeakCompleteEvent, 200)就好了,其中也参考了下面百度文库中的文章
一下子跳到等待函数 WaitForSingleObject, 是因为下面的 Mutex、Semaphore、Event、WaitableTimer 等同步手段都要使用这个函数; 不过等待函数可不止 WaitForSingleObject 它一个, 但它最简单.
function WaitForSingleObject(
hHandle: THandle; {要等待的对象句柄}
dwMilliseconds: DWORD {等待的时间, 单位是毫秒}
): DWORD; stdcall; {返回值如下:}
WAIT_OBJECT_0 {等着了, 本例中是: 等的那个进程终于结束了}
WAIT_TIMEOUT {等过了点(你指定的时间), 也没等着}
WAIT_ABANDONED {好不容易等着了, 但人家还是不让咱执行; 这一般是互斥对象}
//WaitForSingleObject 的第二个参数一般给常数值 INFINITE, 表示一直等下去, 死等.