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$(strReturn, nStart, nEnd - nStart) If Len(strTmp) > 0 Then ReDim Preserve sArray(1 To i) sArray(i) = strTmp i = i + 1 End If Loop GetInfoSection = sArrayEnd Function
'————————（2）————————————'作用：去掉字符串中的首尾空格、所有无效字符'测试用例'Dim strRes As String'Dim strSour As String''strSour = " " & vbNullChar & vbNullChar & " ab cd" & vbNullChar'strRes = zqTrim(strSour)'MsgBox " 长度=" & Len(strSour) & "值=111" & strRes & "222"Public Function zqTrim(ByVal strSour As String) As String Dim strTmp As String Dim nLen As Integer Dim i As Integer, j As Integer Dim strNow As String, strValid() As String, strNew As String 'strNow 当前字符 'strValid 有效字符 'strNew 最后生成的新字符 strTmp = Trim$(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$(strNew) '去掉字符串中的首尾空格End Function
'————————（3）————————————'检查文件是否存在,存在返回 TRUE,否则返回FALSEPublic Function CheckFileExist(strFile As String) As Boolean If Dir(strFile, vbDirectory) <> "" Then CheckFileExist = True Else CheckFileExist = False End IfEnd Function
'————————（4）————————————'获得指定ini文件中某个节下面某个子键的键值,需要下面的API声明'Public Declare Function GetPrivateProfileString Lib "kernel32" Alias _' "GetPrivateProfileStringA" (ByVal lpApplicationName As String, _' ByVal lpKeyName As Any, ByVal lpDefault As String, ByVal lpReturnedString _' As String, ByVal nSize As Long, ByVal lpFileName As String) As Long'返回一个字符串'调用举例：'Dim strRun As String'strRun = GetiniValue("Windows","Run", "C:/Windows/Win.ini")
Public Function GetiniValue(ByVal lpKeyName As String, ByVal strName As String, ByVal strIniFile As String) As String Dim strTmp As String * 255 Call GetPrivateProfileString(lpKeyName, strName, "", _ strTmp, Len(strTmp), strIniFile) GetiniValue = Left$(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
