| Pregunta: | 27787 - SABER SI UNA APLICACION EXISTE EN UNA MAQUINA |
| Autor: | gerardo montilla |
| necesito saber desde visual basic ,si access esta instalado en una maquina y si esta que me devuelva la direccion donde esta.
le agradesco si me pueden decir cual funcion del Api de windows puedo utilizar para verificar si existe access en la maquina, que me devuelva la direccion donde se encuentra el ejecutable. | |
| Respuesta: | gerardo montilla |
| este ejemplo sirve para buscar cualquier archivo en la maquina y me dice si existe y el tamaño que ocupa. yo formule la pregunta por que no sabia pero luego busque en internet y encontre estas lineas de codigo que me sirvieron.
Visual Basic Example - Find Files 'Create a form with a command button (command1), a list box (list1) 'and four text boxes (text1, text2, text3 and text4). 'Type in the first textbox a startingpath like c:\ 'and in the second textbox you put a pattern like *.* or *.txt Private Declare Function FindFirstFile Lib "kernel32" Alias "FindFirstFileA" (ByVal lpFileName As String, lpFindFileData As WIN32_FIND_DATA) As Long Private Declare Function FindNextFile Lib "kernel32" Alias "FindNextFileA" (ByVal hFindFile As Long, lpFindFileData As WIN32_FIND_DATA) As Long Private Declare Function GetFileAttributes Lib "kernel32" Alias "GetFileAttributesA" (ByVal lpFileName As String) As Long Private Declare Function FindClose Lib "kernel32" (ByVal hFindFile As Long) As Long Const MAX_PATH = 260 Const MAXDWORD = &HFFFF Const INVALID_HANDLE_VALUE = -1 Const FILE_ATTRIBUTE_ARCHIVE = &H20 Const FILE_ATTRIBUTE_DIRECTORY = &H10 Const FILE_ATTRIBUTE_HIDDEN = &H2 Const FILE_ATTRIBUTE_NORMAL = &H80 Const FILE_ATTRIBUTE_READONLY = &H1 Const FILE_ATTRIBUTE_SYSTEM = &H4 Const FILE_ATTRIBUTE_TEMPORARY = &H100 Private Type FILETIME dwLowDateTime As Long dwHighDateTime As Long End Type Private Type WIN32_FIND_DATA dwFileAttributes As Long ftCreationTime As FILETIME ftLastAccessTime As FILETIME ftLastWriteTime As FILETIME nFileSizeHigh As Long nFileSizeLow As Long dwReserved0 As Long dwReserved1 As Long cFileName As String * MAX_PATH cAlternate As String * 14 End Type Function StripNulls(OriginalStr As String) As String If (InStr(OriginalStr, Chr(0)) > 0) Then OriginalStr = Left(OriginalStr, InStr(OriginalStr, Chr(0)) - 1) End If StripNulls = OriginalStr End Function Function FindFilesAPI(path As String, SearchStr As String, FileCount As Integer, DirCount As Integer) 'KPD-Team 1999 'E-Mail: [email protected] 'URL: http://www.allapi.net/ Dim FileName As String ' Walking filename variable... Dim DirName As String ' SubDirectory Name Dim dirNames() As String ' Buffer for directory name entries Dim nDir As Integer ' Number of directories in this path Dim i As Integer ' For-loop counter... Dim hSearch As Long ' Search Handle Dim WFD As WIN32_FIND_DATA Dim Cont As Integer If Right(path, 1) <> "\" Then path = path & "\" ' Search for subdirectories. nDir = 0 ReDim dirNames(nDir) Cont = True hSearch = FindFirstFile(path & "*", WFD) If hSearch <> INVALID_HANDLE_VALUE Then Do While Cont DirName = StripNulls(WFD.cFileName) ' Ignore the current and encompassing directories. If (DirName <> ".") And (DirName <> "..") Then ' Check for directory with bitwise comparison. If GetFileAttributes(path & DirName) And FILE_ATTRIBUTE_DIRECTORY Then dirNames(nDir) = DirName DirCount = DirCount + 1 nDir = nDir + 1 ReDim Preserve dirNames(nDir) End If End If Cont = FindNextFile(hSearch, WFD) 'Get next subdirectory. Loop Cont = FindClose(hSearch) End If ' Walk through this directory and sum file sizes. hSearch = FindFirstFile(path & SearchStr, WFD) Cont = True If hSearch <> INVALID_HANDLE_VALUE Then While Cont FileName = StripNulls(WFD.cFileName) If (FileName <> ".") And (FileName <> "..") Then FindFilesAPI = FindFilesAPI + (WFD.nFileSizeHigh * MAXDWORD) + WFD.nFileSizeLow FileCount = FileCount + 1 List1.AddItem path & FileName End If Cont = FindNextFile(hSearch, WFD) ' Get next file Wend Cont = FindClose(hSearch) End If ' If there are sub-directories... If nDir > 0 Then ' Recursively walk into them... For i = 0 To nDir - 1 FindFilesAPI = FindFilesAPI + FindFilesAPI(path & dirNames(i) & "\", SearchStr, FileCount, DirCount) Next i End If End Function Sub Command1_Click() Dim SearchPath As String, FindStr As String Dim FileSize As Long Dim NumFiles As Integer, NumDirs As Integer Screen.MousePointer = vbHourglass List1.Clear SearchPath = Text1.Text FindStr = Text2.Text FileSize = FindFilesAPI(SearchPath, FindStr, NumFiles, NumDirs) Text3.Text = NumFiles & " Files found in " & NumDirs + 1 & " Directories" Text4.Text = "Size of files found under " & SearchPath & " = " & Format(FileSize, "#,###,###,##0") & " Bytes" Screen.MousePointer = vbDefault End Sub | |