梦见自己的玉器:什么是多线程技术？在VB 中如何使用？

vb6可以实现多线程,不过比较麻烦,vb.net完全支持多线程,请参见msdn.
至于vb6实现多线程请看CreateThread这个API函数.以下有详细方案:
用VB写多线程程序用到的第一个API函数是CreateThread，这个函数的声明如下：

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

这个函数的返回值是线程的句柄，它的参数含义如下：

1.lpThreadAttributes：这个参数表明函数的返回句柄是否可被子进程继承，如果可被继承，则指向一个SECURITY_ATTRIBUTES的结构，否则设为vbnull。

2.dwStackSize：这个参数设置线程的堆栈大小。

3.lpStartAddress：这个参数指明这个线程函数的起始地址。

4.lpParameter：这个参数是传给线程函数的参数。

5.dwCreationFlags：这个参数设置当线程创建时的初始状态，挂起，运行等等。

6.lpThreadId：这个参数是待创建线程的ID号。

假设创建一个管理线程的类clsThreads，用类的一个公用函数Initialize来初始化线程，用ResumeThread和SuspendThread函数来激活线程，实现代码如下：

Private Type udtThread

Handle As Long

Enabled As Boolean

End Type

Private uThread As udtThread

Private Const CREATE_SUSPENDED As Long = &H4

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 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) '初始化线程

Dim lStackSize As Long, lCreationFlags As Long, lpThreadId As Long, lNull As Long

On Error Resume Next

lNull = 0 '创建一个空指针

lStackSize = 0 '0表示用exe的stack size

lCreationFlags = CREATE_SUSPENDED '表示初始化后先不激活，让别人来激活

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 '激活线程

uThread.Enabled = True

ElseIf uThread.Enabled Then

SuspendThread uThread.Handle

uThread.Enabled = False

End If

End Property

Private Sub Class_Terminate() '终止线程

On Error Resume Next

Call TerminateThread(uThread.Handle, 0)

End Sub

以上内容在类模块clsThreads中，有了它就可以在窗体中实现多线程了。下面以一个简单的例子来说明如何创建多线程(以2个线程为例)。

在form1中添加picture1和picture2两个图片框，以及一个command1按钮，在工程中添加一个bas模块，该模块的代码如下：

Option Explicit

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 60000

BgColor = lCounter Mod 256

Form1.Picture1.BackColor = RGB(BgColor, 0, 0) '变化图片框的颜色

lTick = GetTickCount

While GetTickCount - lTick < 10 '延迟10个毫秒时间

Wend

Next

End Sub

Public Sub FlickerBottom()

Static BgColor As Long

Dim lTick As Long, lCounter As Long

On Error Resume Next

For lCounter = 0 To 60000

BgColor = lCounter Mod 256

Form1.Picture2.BackColor = RGB(0, BgColor, 0)

lTick = GetTickCount

While GetTickCount - lTick < 10

Wend

Next

End Sub

最后在form1中用下面的代码来创建两个线程，

Option Explicit

Public myThreadTop As New clsThreads, myThreadBottom As New clsThreads

Private Sub Command1_Click()

On Error Resume Next

With myThreadTop

.Initialize AddressOf FlickerTop

.Enabled = True

End With

With myThreadBottom

.Initialize AddressOf FlickerBottom

.Enabled = True

End With

MsgBox "看看会有什么..."

Set myThreadTop = Nothing

Set myThreadBottom = Nothing

End Sub

多线程 就是在一心二用的意思.
在同时做多个事情.

不是什么语言都对这个支持的很好的,vb 好象不太好用

vb玩多线程，估计有点困难。你可以看看csdn里，熊超写过的一篇这方面的文章

就是又多个线程同时运行。vb 里怎么用还不会