VB下几个非常有用的函数-VB控件-依恋网

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$(strNew) ´去掉字符串中的首尾空格
End Function
´————————（3）————————————
´检查文件是否存在,存在返回 TRUE,否则返回FALSE
Public Function CheckFileExist(strFile As String) As Boolean
If Dir(strFile, vbDirectory) <> "" Then
CheckFileExist = True
Else
CheckFileExist = False
End If
End Function
´————————（4）————————————
´获得指定ini文件中某个节下面某个子键的键值,需要下面的API声明
´Public Declare Function GetPrivateProfileString Lib "kernel32" Alias _
´    "GetPrivateProfileStringA" (ByVal lpApplicationName As String, _
´    ByVal lpKeyName As Any, ByVal lpDefault As String, ByVal lpReturnedString _
´    As String, ByVal nSize As Long, ByVal lpFileName As String) As Long
´返回一个字符串
´调用举例：
´Dim strRun As String
´strRun = GetiniValue("Windows","Run", "C:\Windows\Win.ini")
Public Function GetiniValue(ByVal lpKeyName As String, ByVal strName As String, ByVal strIniFile As String) As String
Dim strTmp As String * 255
Call GetPrivateProfileString(lpKeyName, strName, "", _
strTmp, Len(strTmp), strIniFile)
GetiniValue = Left$(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$(windir, InStr(windir, vbNullChar) - 1)
End Function
´————————（6）————————————
´获得Windows系统目录,需要下面的API声明
´Private Declare Function GetSystemDirectory Lib "kernel32" Alias "GetSystemDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
´返回一个字符串，如“C:\Windows\System”、“C:\Winnt\System32”
´调用举例：
´Dim strSysDir As String
´strSysDir = GetSystemDir()
Private Function GetSystemDir()
Dim strSysDir As String * 100
Call GetSystemDirectory(strSysDir, 100)
GetSystemDir = Left$(strSysDir, InStr(strSysDir, vbNullChar) - 1)
End Function