form1.frm

vb开发数学课件

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text2 
      Height          =   855
      Left            =   480
      TabIndex        =   2
      Text            =   "Text2"
      Top             =   1800
      Width           =   2295
   End
   Begin VB.TextBox Text1 
      Height          =   1095
      Left            =   480
      TabIndex        =   1
      Text            =   "Text1"
      Top             =   240
      Width           =   3495
   End
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      Height          =   495
      Left            =   3360
      TabIndex        =   0
      Top             =   2040
      Width           =   1215
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
'注意VB里数据长度与vc的区别，在声明里要体现出来，调用方法其实与调用API一样
Private Declare Function STDsetfornum Lib "e:\wl\forcaldll.dll" (ByVal m As Long) As Boolean
Private Declare Function STDrcal Lib "e:\wl\forcaldll.dll" (ByVal m As Long, ByRef a As Double) As Double
Private Declare Function STDrcom Lib "e:\wl\forcaldll.dll" (ByVal m As Long, ByVal a As String, ByRef n As Long) As Long
Private Declare Sub STDfreedll Lib "e:\wl\forcaldll.dll" ()

Private Sub Command1_Click()
Dim d(100) As Double
Dim a As String
Dim rtnval_a As Long
Dim x, i As Integer
a = Text1.Text
If a = "" Then
 Text1.Text = "请在此输入表达式！"
Else
 If STDsetfornum(1&) Then
  If STDrcom(0&, a, rtnval_a) = 0 Then
   For i = 0 To rtnval_a + 2
    d(i) = 5
   Next i
   Text2.Text = STDrcal(0&, d(0))
  Else
   Text2.Text = "语法错误！"
  End If
  STDfreedll
 End If
End If
End Sub

Private Sub Form_Load()
Text1.Text = ""
End Sub