Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
Function sqrx(ByVal x As Double) As String '计算平方根(比VB DOUBLE 类型精度高) Dim temp As String, i As Long, j As Long Shell "Calc.EXE", vbMinimizedNoFocus '运行计算器 temp = x & "y0.5=" For i = 1 To Len(temp) SendKeys Mid(temp, i, 1), True '向计算器顺序发送按键消息X (X^Y) 0.5= Next temp = String(64, Chr(0)) i = FindWindow(vbNullString, "计算器") '窗口句柄 j = FindWindowEx(i, ByVal 0&, "Edit", vbNullString) '编辑框句柄 SendMessage j, &HD, Len(temp), ByVal temp '发送编辑框文本至temp SendKeys "%{F4}", True '调用ALT+F4关闭计算器窗口 sqrx = temp End Function
Private Sub Command1_Click() Dim i As Integer For i = 17 To 24 Debug.Print "sqrx(" & i & ")=" & sqrx(i) Next End Sub
返回: sqrx(17)=4.1231056256176605498214098559741 sqrx(18)=4.2426406871192851464050661726291 sqrx(19)=4.3588989435406735522369819838596 sqrx(20)=4.4721359549995793928183473374626 sqrx(21)=4.582575694955840006588047193728 sqrx(22)=4.6904157598234295545656301135445 sqrx(23)=4.7958315233127195415974380641627 sqrx(24)=4.8989794855663561963945681494118 
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