在VB5中如何使机箱内的小喇叭发出不同的声音?
2006-02-27 11:56:39 来源:WEB开发网
核心提示:->-chengdx回答1:Mmsound.drv是小喇叭的系统接口,很多API的书都有用法介绍-219张晶回答2:使用VB中的beep语句,在VB5中如何使机箱内的小喇叭发出不同的声音?,但这只能发出一种声音,如果想发出不同声音
->-chengdx
回答1:
Mmsound.drv是小喇叭的系统接口,很多API的书都有用法介绍
-219张晶
回答2:
使用VB中的beep语句,但这只能发出一种声音。如果想发出不同声音,可以
使用API函数。详情如下:(摘自VB-Helper)
UsetheBeepAPIfunction.
Thisexampledemonstratestwointerestingthings.First,itshowshowtomakeabeepofanyfrequencyanddurationratherthanusingthestandardtoneyougetwiththeBeepstatement.
Second,notethattheBeepAPIfunctionhasthesamenameasVisualBasic'sBeepstatement.Todifferentiatethem,youcanassignanewnametotheBeepAPIfunctioninitsDeclarestatement.Itisknownas"Beep"inthelibrary(theAliasstatement)butitisknownasAPIBeeptothePRogram.
Youcanusethistechniquetodifferentiatebetweenfunctionswiththesamename,oryoucanuseittogiveAPIfunctionsanamethatiseasiertowrite(forexample,iftheAPInameisverylong).
Inthedeclarationssection:
OptionExplicit
PrivateDeclareFunctionAPIBeepLib"kernel32"Alias"Beep"(ByValdwFreqAsLong,ByValdwDurationAsLong)AsLong
'Tomakeabeeplasting500millisecondswithfrequencyspecifiedinthe
'TextBoxtxtFrequency(try1000forstarters):
PrivateSubCommand1_Click()
DimfrequencyAsLong
frequency=CLng(txtFrequency.Text)
APIBeepfrequency,500
EndSub
-Prisoner->
->
赞助商链接