在csdn上的例程确实太老了,而且实用性不大。
下面给出完全用vb实现的多线程程序。
----------以下在Main.bas中定义------------------
'这里的例子函数是开线程后的函数入口
'这里您可以定义自己的程序
Private Declare Function GetTickCount Lib "kernel32" () As Long
Public Sub FlickerTop()
Static BgColor As Long
Dim lTick As Long, lCounter As Long
On Error Resume Next
For lCounter = 0 To 5999
If BgColor <> &HFF& Then BgColor = &HFF& Else BgColor = &HFF00&
Form1.Picture1.BackColor = BgColor
lTick = GetTickCount
While GetTickCount - lTick < 1250
Wend
Next
End Sub
-------------------在cls中的定义------------------------
Private Type udtThread
Handle As Long
Enabled As Boolean
End Type
Private uThread As udtThread
Private Const CREATE_SUSPENDED As Long = &H4
Private Const THREAD_BASE_PRIORITY_IDLE As Long = -15
Private Const THREAD_BASE_PRIORITY_LOWRT As Long = 15
Private Const THREAD_BASE_PRIORITY_MAX As Long = 2
Private Const THREAD_BASE_PRIORITY_MIN As Long = -2
Private Const THREAD_PRIORITY_HIGHEST As Long = THREAD_BASE_PRIORITY_MAX
Private Const THREAD_PRIORITY_LOWEST As Long = THREAD_BASE_PRIORITY_MIN
Private Const THREAD_PRIORITY_ABOVE_NORMAL As Long = (THREAD_PRIORITY_HIGHEST - 1)
Private Const THREAD_PRIORITY_BELOW_NORMAL As Long = (THREAD_PRIORITY_LOWEST + 1)
Private Const THREAD_PRIORITY_IDLE As Long = THREAD_BASE_PRIORITY_IDLE
Private Const THREAD_PRIORITY_NORMAL As Long = 0
Private Const THREAD_PRIORITY_TIME_CRITICAL As Long = THREAD_BASE_PRIORITY_LOWRT
Private Declare Function CreateThread Lib "kernel32" (ByVal lpThreadAttributes As Any, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, lpParameter As Any, ByVal dwCreationFlags As Long, lpThreadId As Long) As Long
Private Declare Function ResumeThread Lib "kernel32" (ByVal hThread As Long) As Long
Private Declare Function SetThreadPriority Lib "kernel32" (ByVal hThread As Long, ByVal nPriority As Long) As Long
Private Declare Function GetThreadPriority Lib "kernel32" (ByVal hThread As Long) As Long
Private Declare Function SuspendThread Lib "kernel32" (ByVal hThread As Long) As Long
Private Declare Function TerminateThread Lib "kernel32" (ByVal hThread As Long, ByVal dwExitCode As Long) As Long
Public Sub Initialize(ByVal lpfnBasFunc As Long)
Dim lStackSize As Long, lCreationFlags As Long, lpThreadId As Long, lNull As Long
On Error Resume Next
lNull = 0
lStackSize = 0
lCreationFlags = CREATE_SUSPENDED
uThread.Handle = CreateThread(lNull, lStackSize, lpfnBasFunc, lNull, lCreationFlags, lpThreadId)
If uThread.Handle = lNull Then MsgBox "Create thread failed!"
End Sub
Public Property Get Enabled() As Boolean
On Error Resume Next
Enabled = uThread.Enabled
End Property
Public Property Let Enabled(ByVal vNewValue As Boolean)
On Error Resume Next
If vNewValue And (Not uThread.Enabled) Then
ResumeThread uThread.Handle
uThread.Enabled = True
ElseIf uThread.Enabled Then
SuspendThread uThread.Handle
uThread.Enabled = False
End If
End Property
Public Property Get Priority() As Long
On Error Resume Next
Priority = GetThreadPriority(uThread.Handle)
End Property
Public Property Let Priority(ByVal vNewValue As Long)
On Error Resume Next
If vNewValue = -2 Then
Call SetThreadPriority(uThread.Handle, THREAD_PRIORITY_LOWEST)
ElseIf vNewValue = -1 Then
Call SetThreadPriority(uThread.Handle, THREAD_PRIORITY_BELOW_NORMAL)
ElseIf vNewValue = 0 Then
Call SetThreadPriority(uThread.Handle, THREAD_PRIORITY_NORMAL)
ElseIf vNewValue = 1 Then
Call SetThreadPriority(uThread.Handle, THREAD_PRIORITY_ABOVE_NORMAL)
ElseIf vNewValue = 2 Then
Call SetThreadPriority(uThread.Handle, THREAD_PRIORITY_HIGHEST)
End If
End Property
Private Sub Class_Terminate()
On Error Resume Next
Call TerminateThread(uThread.Handle, 0)
End Sub
---------------------在主程序中---------------------
Dim myThreadTop As New clsThreads, myThreadBottom As New clsThreads
On Error Resume Next
With myThreadTop
.Initialize AddressOf FlickerTop
.Enabled = True
End With
'处理其他程序
...
'注意使用后释放资源
Set myThreadTop = Nothing
Set myThreadBottom = Nothing