VBA Excel 中的多线程[重复]

使用VBA Excel中的多线程来提高程序的效率是一个非常有用的技巧。通过使用多线程，我们可以同时执行多个任务，从而加快程序的运行速度。在本文中，我们将介绍如何在Excel中实现多线程，并提供一个案例代码来帮助读者更好地理解。

vba
Option Explicit
Private Declare PtrSafe Function CreateThread Lib "kernel32" ( _
    ByVal lpThreadAttributes As LongPtr, _
    ByVal dwStackSize As LongPtr, _
    ByVal lpStartAddress As LongPtr, _
    ByVal lpParameter As LongPtr, _
    ByVal dwCreationFlags As Long, _
    ByRef lpThreadId As Long) As LongPtr
Private Declare PtrSafe Function WaitForSingleObject Lib "kernel32" ( _
    ByVal hHandle As LongPtr, _
    ByVal dwMilliseconds As Long) As Long
Private Declare PtrSafe Function CloseHandle Lib "kernel32" ( _
    ByVal hObject As LongPtr) As Long
Private Sub ThreadProc(ByVal param As LongPtr)
    ' 在此处添加需要执行的任务代码
    ' 例如，可以在这里进行数据处理、计算等操作
End Sub
Public Sub RunThreads()
    Const NUM_THREADS As Long = 5
    Dim i As Long
    Dim hThread As LongPtr
    Dim threadId As Long
    
    For i = 1 To NUM_THREADS
        hThread = CreateThread(0, 0, AddressOf ThreadProc, 0, 0, threadId)
        If hThread <> 0 Then
            ' 等待线程执行完毕
            WaitForSingleObject hThread, -1
            ' 关闭线程句柄
            CloseHandle hThread
        End If
    Next i
End Sub

vba
Option Explicit
Private Declare PtrSafe Function CreateThread Lib "kernel32" ( _
    ByVal lpThreadAttributes As LongPtr, _
    ByVal dwStackSize As LongPtr, _
    ByVal lpStartAddress As LongPtr, _
    ByVal lpParameter As LongPtr, _
    ByVal dwCreationFlags As Long, _
    ByRef lpThreadId As Long) As LongPtr
Private Declare PtrSafe Function WaitForSingleObject Lib "kernel32" ( _
    ByVal hHandle As LongPtr, _
    ByVal dwMilliseconds As Long) As Long
Private Declare PtrSafe Function CloseHandle Lib "kernel32" ( _
    ByVal hObject As LongPtr) As Long
Private Sub ThreadProc(ByVal param As LongPtr)
    Dim rng As Range
    Dim cell As Range
    
    ' 获取需要计算的数据范围
    Set rng = ThisWorkbook.Sheets("Sheet1").Range("A1:C1000")
    
    ' 遍历每个单元格，并进行复杂的计算操作
    For Each cell In rng
        ' 在此处添加复杂的计算代码
        ' 例如，可以进行数值运算、条件判断等操作
    Next cell
End Sub
Public Sub ParallelCompute()
    Const NUM_THREADS As Long = 4
    Dim i As Long
    Dim hThread As LongPtr
    Dim threadId As Long
    
    For i = 1 To NUM_THREADS
        hThread = CreateThread(0, 0, AddressOf ThreadProc, 0, 0, threadId)
        If hThread <> 0 Then
            ' 等待线程执行完毕
            WaitForSingleObject hThread, -1
            ' 关闭线程句柄
            CloseHandle hThread
        End If
    Next i
End Sub