读文件用到GetPrivateProfileString，写文件需要用到WritePrivateProfileString。 
在窗体放置两个命令按钮Command1与Command2，分别用来执行写操作与读操作。 
Private Declare Function GetPrivateProfileString Lib "kernel32" Alias "GetPrivateProfileStringA" (ByVal lpApplicationName As String, ByVal lpKeyName As Any, ByVal lpDefault As String, ByVal lpReturnedString As String, ByVal nSize As Long, ByVal lpFileName As String) As Long 
Private Declare Function WritePrivateProfileString Lib "kernel32" Alias "WritePrivateProfileStringA" (ByVal lpApplicationName As String, ByVal lpKeyName As Any, ByVal lpString As Any, ByVal lpFileName As String) As Long 
Private Sub Command1_Click() 
Dim A As Long 
写信息 
修改ABC.INI文件中TIP字段中START的值为当前系统时间 
如果该文件不存在会自动建立,当函数返回值为0时说明修改不成功 
A = WritePrivateProfileString("TIP", "START", Time$, App.Path & "\ABC.INI") 
If A = 0 Then MsgBox ("写文件时出错") 
End Sub 
Private Sub Command2_Click() 
Dim A As Long 
Dim T As String 
读取信息 
T = Space$(1000) ’事先定义读取值的字串宽度 
读取ABC.INI文件中TIP字段中START的值并打印出来 
当函数返回值为0时说明读取数据出错 
A = GetPrivateProfileString("TIP", "START", "", T, 1000, App.Path & "\ABC.INI") 
If A = 0 Then MsgBox "找不到所需字段": Exit Sub 
Print Left$(T, Len(Trim$(T)) - 1) 
End Sub