可视化程序设计(VB)之二进制文件操作实例
【例】 设计一个窗体说明二进制文件基本操作的实现方法。 在本章工程中添加一个窗体Form1,在其中放置一个文本框Text1和4个命令按钮(从左
Command2、Command3和Command4),如图所示。 到右分别为Command1、
在该窗体上设计如下事件过程:
Dim mystring As String
Private Sub Command1_Click()
mystring = String$(10, " ")
Get #1, 1, mystring
Text1.Text = mystring
End Sub
Private Sub Command2_Click()
mystring = String$(26, " ")
Get #1, 11, mystring
Text1.Text = mystring
End Sub
Private Sub Command3_Click()
mystring = String$(26, " ")
Get #1, 37, mystring
Text1.Text = mystring
End Sub
Private Sub Command4_Click()
Close #1
End
End Sub
Private Sub Form_Load()
Open "try.dat" For Binary As #1
mystring = "1234567890"
Put #1, 1, mystring
mystring = "abcedfghijklmnopqrstuvwxyz"
Put #1, , mystring
mystring = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
Put #1, , mystring
End Sub
运行本工程,出现Form1窗体,单击“大写字母”命令按钮,则从二进制文件try.dat中
找出大写字母并显示,如图所示。