form2.frm

基于VB语言编写的热力学性质计算的应用软件（数据库操作）

VERSION 5.00
Begin VB.Form Form2 
   AutoRedraw      =   -1  'True
   BackColor       =   &H00C0C0C0&
   Caption         =   "纯流体程序计算"
   ClientHeight    =   3210
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4230
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3210
   ScaleWidth      =   4230
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command2 
      BackColor       =   &H00FFC0C0&
      Caption         =   "返回"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   400
      Index           =   0
      Left            =   3120
      Style           =   1  'Graphical
      TabIndex        =   7
      Top             =   2640
      Width           =   975
   End
   Begin VB.CommandButton Command1 
      BackColor       =   &H00FFC0C0&
      Caption         =   "确定"
      Default         =   -1  'True
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   400
      Left            =   1800
      Style           =   1  'Graphical
      TabIndex        =   6
      Top             =   2640
      Width           =   1095
   End
   Begin VB.Frame Frame1 
      BackColor       =   &H00C0C0C0&
      Caption         =   "请选择已知数据"
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   1575
      Left            =   1800
      TabIndex        =   2
      Top             =   720
      Width           =   2175
      Begin VB.OptionButton Option3 
         BackColor       =   &H00C0C0C0&
         Caption         =   "已知P与T"
         Height          =   255
         Left            =   480
         TabIndex        =   5
         Top             =   1200
         Width           =   1215
      End
      Begin VB.OptionButton Option2 
         BackColor       =   &H00C0C0C0&
         Caption         =   "已知P与V"
         Height          =   375
         Left            =   480
         TabIndex        =   4
         Top             =   720
         Width           =   1455
      End
      Begin VB.OptionButton Option1 
         BackColor       =   &H00C0C0C0&
         Caption         =   "已知V与T"
         Height          =   255
         Left            =   480
         TabIndex        =   3
         Top             =   360
         Width           =   1575
      End
   End
   Begin VB.ComboBox Combo1 
      BackColor       =   &H80000018&
      Height          =   300
      Left            =   240
      TabIndex        =   1
      Top             =   1320
      Width           =   1335
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "物质及已知数据的选择"
      BeginProperty Font 
         Name            =   "黑体"
         Size            =   14.25
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   285
      Left            =   600
      TabIndex        =   8
      Top             =   120
      Width           =   2850
   End
   Begin VB.Label Label1 
      BackStyle       =   0  'Transparent
      Caption         =   "请选择要计  算的物质"
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   120
      TabIndex        =   0
      Top             =   720
      Width           =   1215
   End
End
Attribute VB_Name = "Form2"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
If Form2.Combo1.Text = "" Or (Form2.Option1 = False And Form2.Option2 = False And Form2.Option3 = False) Then
    MsgBox "对不起你还未正确选择！", vbOKCancel + 48, "程序"
Else
   If Form2.Option1.Value = True Then
     Do While 1
        V = Val(InputBox("请输入体积" + Chr(13) + Chr(10) + "单位(m3/mol)", "数据输入"))
         If V <= 0 Then
             MsgBox "对不起体积应当大于0！" + Chr(13) + Chr(10) + "请重新输入！", vbOKCancel + 48, "程序"
         Else
            Exit Do
        End If
     Loop
     Do While 1
        t = Val(InputBox("请输入温度" + Chr(13) + Chr(10) + "单位(K)", "数据输入"))
         If t <= 0 Then
            MsgBox "对不起温度应当大于0！" + Chr(13) + Chr(10) + "请重新输入！", vbOKCancel + 48, "程序"
         Else
            Exit Do
         End If
     Loop
      STR3 = "已知条件：" + "体积：" + Str(V) + "m3/mol" + Chr(13) + Chr(10) + "   " + "       温度：" + Str(t) + "K"
   End If
   If Form2.Option2.Value = True Then
     Do While 1
         P = Val(InputBox("请输入压强" + Chr(13) + Chr(10) + "单位(Pa)", "数据输入"))
         If P <= 0 Then
            MsgBox "对不起压强应当大于0！" + Chr(13) + Chr(10) + "请重新输入！", vbOKCancel + 48, "程序"
         Else
            Exit Do
         End If
     Loop
     Do While 1
        V = Val(InputBox("请输入体积" + Chr(13) + Chr(10) + "单位(m3/mol)", "数据输入"))
         If V <= 0 Then
            MsgBox "对不起体积应当大于0！" + Chr(13) + Chr(10) + "请重新输入！", vbOKCancel + 48, "程序"
         Else
            Exit Do
        End If
     Loop
      STR3 = "已知条件：" + "压强：" + Str(P) + "Pa" + Chr(13) + Chr(10) + "   " + "       体积：" + Str(V) + "m3/mol"
    End If
   If Form2.Option3.Value = True Then
     Do While 1
         P = Val(InputBox("请输入压强" + Chr(13) + Chr(10) + "单位(Pa)", "数据输入"))
         If P <= 0 Then
            MsgBox "对不起压强应当大于0！" + Chr(13) + Chr(10) + "请重新输入！", vbOKCancel + 48, "程序"
         Else
            Exit Do
         End If
     Loop
     Do While 1
        t = Val(InputBox("请输入温度" + Chr(13) + Chr(10) + "单位(K)", "数据输入"))
         If t <= 0 Then
            MsgBox "对不起温度应当大于0！" + Chr(13) + Chr(10) + "请重新输入！", vbOKCancel + 48, "程序"
         Else
            Exit Do
         End If
     Loop
      STR3 = "已知条件：" + "压强：" + Str(P) + "Pa" + Chr(13) + Chr(10) + "   " + "       温度：" + Str(t) + "K"
   End If
   

   
   
   
'建立索引
'Set autb = myData.TableDefs("物性参数数据")

'Set wuidx = autb.CreateIndex("物质中文名")
'wuidx.Primary = True '主索引
'wuidx.Unique = True
'Set wuidxfld = wuidx.CreateField("物质中文名")
' 添加到各集合对象中
'wuidx.Fields.Append wuidxfld
'autb.Indexes.Append wuidx
'myData.TableDefs.Append autb

   myRecord.Index = "物质中文名"
   myRecord.Seek "=", Combo1.Text
   Pc1 = myRecord.Fields("临界压力Pc").Value
   Tc1 = myRecord.Fields("临界温度Tc").Value
   Vc1 = myRecord.Fields("临界体积Vc").Value
   Zc1 = myRecord.Fields("临界压缩因子Zc").Value
   w1 = myRecord.Fields("偏心因子wc").Value
   
 Form2.Hide
 Form3.Show
End If
End Sub

Private Sub Command2_Click(Index As Integer)
Unload Me
Form1.Show
End Sub


Private Sub Form_Load()
Set myWork = DBEngine.Workspaces(0)
Set myData = myWork.OpenDatabase(App.Path & "\物质参数.mdb", , ";")
Set myRecord = myData.OpenRecordset("物性参数数据")

Combo1.Clear
Do While myRecord.EOF = False
  Combo1.AddItem myRecord.Fields("物质中文名").Value
  myRecord.MoveNext
Loop
End Sub