原文出自：http://vg1.homeip.net/faq/vbvc/3895.shtml 原文是V*著名选手darkside 所写黑经:怎样用vb写多线程.Posted by darkside on August 04, 1998 at 15:37:13: 尽管vb5是apprent single-thread(单线程)的.但用addressof加上一些API,就可以非常容易的做多线程.(比VC容易的多,做出来的东西也一样快,因为都是用API). 每一个县城(线程,下同)约占用20毫秒的时间片.vb5有一个主线程.我们可以另外加一个工作线程.对于不清楚什么是单/多线程的程序元,我们用一个简单的列子来说明一下. 再form里加上两个timer控件. 吧interval属性设成5000(5秒),然后在两个timer1_timer事件中放一个大loop, 如for 10000 next. 运行. 你会看到第二个timer控件不会在五秒后执行,除非timer1的for-next结束. 同样,如果你的程序中有大量的数据库读写.你的用户街面可能被"冻".这时,我们就需要用多县城来改进程序了.(当然你可以用DoEvents来避免被冻,但用DoEvents有横多副作用.这里不提).我们用的第一个API是CreateThread, VB的格式是:private declare function CreateThread Lib "kernel32" (byval pThreadAttributes as any, byval dwStackSize as long, byval lpStartAddress as long, lpParameter as any, byval dwCreationFlags as long, lpThreadID as long) as long. (从vb API text viewer中拿是最真确的语法)CreateThread的参数指出你将要创立的县城是什么样子的. CreateThread的返回值是一个县城的handle. 这里是vb的多县城初始化程序:Public Sub Initialize(lpfnBasFunc as long) dim dwStackSize as long dim dwCreationFlags as long dim lpThreadId as long dim lpParameter as long dim myNull as long myNull = 0& 'create a null pointer dwStackSize = 0 '0表示用exe stack size dwCreationFlags = 4 '用4表示初始化后先不激活,让别人来激活. Me.Thread = CreateThread(myNull, dwStackSize, lpfnBasFunc, myNull, dwCreationFlags, lpThreadId) if Me.Thread = myNull then Msgbox "create thread failed" end if end Sub 下面是两个API用来激活/暂定该线程.private declare function ResumeThread lib "kernel32"(byval hThread as long)as longprivate declare function SuspendThread lib "kernel32"(byval hThread as long)as long让我们来用一个变量表示当前县城的状态. public ThreadStatus as boolean 在vb里,可用property来实现ThreadStatus的管理. Public property Let Enabled(byval vNewValue as boolean) if vNewValue = true and Me.ThreadStatus = false then ResumeThread Me.Thread Me.ThreadStatus = True elseif Me.ThreadStatus = true then SuspendThread Me.Thread Me.ThreadStatus = False endif end Property这个简单的类可以用New Object来引用: 'make new thread object dim myThread as New clsThreads '创建县城 Foo myThread.Initialize AddressOf Foo '激活县城 myThread.Enabled = True执行后,你可以用PVIEW95.EXE看到你的线程. 你还可以提高你的线程的优先级. SetThreadPriority '设优先级GetThreadPriority '查优先级你把以上的程序加入timer例子,就会看到两个timer同时运行. 这里要提醒一下. vb5的开发环境是单县城的.如果你的程序写错,或中断后试图恢复,往往会出错,有时是GPF错. 总之,用vb写多线程可以写出和VC一样快的程序.而且开发容易的多,开发速度也快得多
原文是V*著名选手darkside 所写黑经:怎样用vb写多线程.Posted by darkside on August 04, 1998 at 15:37:13:
尽管vb5是apprent single-thread(单线程)的.但用addressof加上一些API,就可以非常容易的做多线程.(比VC容易的多,做出来的东西也一样快,因为都是用API). 每一个县城(线程,下同)约占用20毫秒的时间片.vb5有一个主线程.我们可以另外加一个工作线程.对于不清楚什么是单/多线程的程序元,我们用一个简单的列子来说明一下.
再form里加上两个timer控件. 吧interval属性设成5000(5秒),然后在两个timer1_timer事件中放一个大loop, 如for 10000 next. 运行. 你会看到第二个timer控件不会在五秒后执行,除非timer1的for-next结束. 同样,如果你的程序中有大量的数据库读写.你的用户街面可能被"冻".这时,我们就需要用多县城来改进程序了.(当然你可以用DoEvents来避免被冻,但用DoEvents有横多副作用.这里不提).我们用的第一个API是CreateThread, VB的格式是:private declare function CreateThread Lib "kernel32" (byval pThreadAttributes as any, byval dwStackSize as long, byval lpStartAddress as long, lpParameter as any, byval dwCreationFlags as long, lpThreadID as long) as long. (从vb API text viewer中拿是最真确的语法)CreateThread的参数指出你将要创立的县城是什么样子的. CreateThread的返回值是一个县城的handle. 这里是vb的多县城初始化程序:Public Sub Initialize(lpfnBasFunc as long)
dim dwStackSize as long
dim dwCreationFlags as long
dim lpThreadId as long
dim lpParameter as long
dim myNull as long
myNull = 0& 'create a null pointer
dwStackSize = 0 '0表示用exe stack size
dwCreationFlags = 4 '用4表示初始化后先不激活,让别人来激活.
Me.Thread = CreateThread(myNull, dwStackSize, lpfnBasFunc, myNull, dwCreationFlags, lpThreadId)
if Me.Thread = myNull then
Msgbox "create thread failed"
end if
end Sub
下面是两个API用来激活/暂定该线程.private declare function ResumeThread lib "kernel32"(byval hThread as long)as longprivate
declare function SuspendThread lib "kernel32"(byval hThread as long)as long让我们来用一个变量表示当前县城的状态.
public ThreadStatus as boolean
在vb里,可用property来实现ThreadStatus的管理.
Public property Let Enabled(byval vNewValue as boolean)
if vNewValue = true and Me.ThreadStatus = false then
ResumeThread Me.Thread
Me.ThreadStatus = True
elseif Me.ThreadStatus = true then
SuspendThread Me.Thread
Me.ThreadStatus = False
endif
end Property这个简单的类可以用New Object来引用:
'make new thread object
dim myThread as New clsThreads
'创建县城 Foo
myThread.Initialize AddressOf Foo
'激活县城
myThread.Enabled = True执行后,你可以用PVIEW95.EXE看到你的线程.
你还可以提高你的线程的优先级.
SetThreadPriority '设优先级GetThreadPriority '查优先级你把以上的程序加入timer例子,就会看到两个timer同时运行.
这里要提醒一下. vb5的开发环境是单县城的.如果你的程序写错,或中断后试图恢复,往往会出错,有时是GPF错.
总之,用vb写多线程可以写出和VC一样快的程序.而且开发容易的多,开发速度也快得多
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