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VB下几个非常有用的函数 (转)

原创 IT综合 作者:worldblog 时间:2007-12-05 10:46:06 0 删除 编辑
VB下几个非常有用的函数 (转)[@more@]

  VB下几个非常有用的函数
'————————(1)————————————
'获得指定ini文件中某个节下面的所有键值 TrueZq,,需要下面的api声明
'Private Declare Function GetPrivateProfileSection Lib "kernel32" Alias "GetPrivateProfileSectionA" (ByVal lpAppName As String, ByVal lpReturnedString As String, ByVal nSize As Long, ByVal lpFileName As String) As Long
'返回一个字符串数组
'调用举例:
'Dim arrClass() As String
'arrClass = GetInfoSection("class", "d:type.ini")

 
Public Function GetInfoSection(strSection As String, strIniFile As String) As String()
  Dim strReturn As String * 32767
  Dim strTmp As String
  Dim nStart As Integer, nEnd As Integer, i As Integer
  Dim sArray() As String
 
 
 
  Call GetPrivateProfileSection(strSection, strReturn, Len(strReturn), strIniFile)
 
  strTmp = strReturn
  i = 1
  Do While strTmp <> ""
  nStart = nEnd + 1
  nEnd = InStr(nStart, strReturn, vbNullChar)
  strTmp = Mid$(strReturn, nStart, nEnd - nStart)
  If Len(strTmp) > 0 Then
  ReDim Preserve sArray(1 To i)
  sArray(i) = strTmp
  i = i + 1
  End If
 
  Loop
  GetInfoSection = sArray
End Function

'————————(2)————————————
'作用:去掉字符串中的首尾空格、所有无效字符
'测试用例
'Dim strRes As String
'Dim strSour As String
'
'strSour = " " & vbNullChar & vbNullChar & " ab cd" & vbNullChar
'strRes = zqTrim(strSour)
'MsgBox " 长度=" & Len(strSour) & "值=111" & strRes & "222"
Public Function zqTrim(ByVal strSour As String) As String
  Dim strTmp As String
  Dim nLen As Integer
  Dim i As Integer, j As Integer
  Dim strNow As String, strValid() As String, strNew As String
  'strNow 当前字符
  'strValid 有效字符
  'strNew 最后生成的新字符
 
  strTmp = Trim$(strSour)
  nLen = Len(strTmp)
  If nLen < 1 Then
  zqTrim = ""
  Exit Function
  End If
  j = 0
  For i = 1 To nLen
  strNow = Mid(strTmp, i, 1) '每次读取一个字符
  'MsgBox Asc(strNow)
  If strNow <> vbNullChar And Asc(strNow) <> 9 Then '如果有效,则存入有效数组
  ReDim Preserve strValid(j)
  strValid(j) = strNow
  j = j + 1
  End If
 
  Next i
 
  strNew = Join(strValid, "") '将所有有效字符连接起来
  zqTrim = Trim$(strNew) '去掉字符串中的首尾空格
End Function


'————————(3)————————————
'检查文件是否存在,存在返回 TRUE,否则返回FALSE
Public Function CheckFileExist(strFile As String) As Boolean
 
  If Dir(strFile, vbDirectory) <> "" Then
  CheckFileExist = True
  Else
  CheckFileExist = False
  End If
End Function

'————————(4)————————————
'获得指定ini文件中某个节下面某个子键的键值,需要下面的API声明
'Public 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
'返回一个字符串
'调用举例:
'Dim strRun As String
'strRun = GetiniValue("windows","Run", "C:WindowsWin.ini")

Public Function GetiniValue(ByVal lpKeyName As String, ByVal strName As String, ByVal strIniFile As String) As String
  Dim strTmp As String * 255
 
  Call GetPrivateProfileString(lpKeyName, strName, "", _
  strTmp, Len(strTmp), strIniFile)
  GetiniValue = Left$(strTmp, InStr(strTmp, vbNullChar) - 1)
 
End Function

'————————(5)————————————
'获得Windows目录 ,需要下面的API声明
'Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
'返回一个字符串,如“C:Windows”、“C:Winnt”
'调用举例:
'Dim strWindir As String
'strWindir = GetWinDir()
Private Function GetWinDir()
  Dim windir As String * 100
  Call GetWindowsDirectory(windir, 100)
  GetWinDir = Left$(windir, InStr(windir, vbNullChar) - 1)
 
End Function

'————————(6)————————————
'获得Windows系统目录,需要下面的API声明
'Private Declare Function GetSystemDirectory Lib "kernel32" Alias "GetSystemDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
'返回一个字符串,如“C:WindowsSystem”、“C:WinntSystem32”
'调用举例:
'Dim strSysDir As String
'strSysDir = GetSystemDir()
Private Function GetSystemDir()
  Dim strSysDir As String * 100
  Call GetSystemDirectory(strSysDir, 100)
  GetSystemDir = Left$(strSysDir, InStr(strSysDir, vbNullChar) - 1)
 
End Function


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