form1.frm

Visual Basic程序设计视频教程

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "查找第一个空格"
   ClientHeight    =   1815
   ClientLeft      =   60
   ClientTop       =   360
   ClientWidth     =   4725
   LinkTopic       =   "Form1"
   ScaleHeight     =   1815
   ScaleWidth      =   4725
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "查找"
      Height          =   495
      Left            =   3360
      TabIndex        =   1
      Top             =   240
      Width           =   1095
   End
   Begin VB.TextBox Text1 
      Height          =   495
      Left            =   360
      TabIndex        =   0
      Text            =   "Text1"
      Top             =   240
      Width           =   2655
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
    '声明变量
    Dim testStr As String
    Dim s As String
    Dim i As Integer
    '赋初值
    testStr = Text1.Text
    i = 1
    '使用循环查找
    Do
       s = Mid(testStr, i, 1)
       If s = " " Then         '找到空格
            MsgBox "第一个空格位置为：" + Str(i)
            Exit Do             '跳出循环
       End If
       i = i + 1
    Loop Until (i > Len(testStr)) '当到达字符串末尾时终止循环
    If i = Len(testStr) + 1 Then
       MsgBox "没有空格！"
    End If
End Sub