Abre un canal de datos.
Open NomeFicheiro As String [For Modo] [Access ModoES] [Protección] As [#]NúmeroFicheiro As Integer [Len = LonxitudeConxuntoDatos]
FileName: Name and path of the file to open. If you try to read a file that does not exist (Access = Read), an error message appears. If you try to write to a file that does not exist (Access = Write), a new file is created.
Mode: Keyword that specifies the file mode. Valid values: Append (append to sequential file), Binary (data can be accessed by bytes using Get and Put), Input (opens data channel for reading), Output (opens data channel for writing), and Random (edits relative files).
IOMode: Keyword that defines the access type. Valid values: Read (read-only), Write (write-only), Read Write (both).
Protected: Keyword that defines the security status of a file after opening. Valid values: Shared (file may be opened by other applications), Lock Read (file is protected against reading), Lock Write (file is protected against writing), Lock Read Write (denies file access).
FileNumber: Any integer expression from 0 to 511 to indicate the number of a free data channel. You can then pass commands through the data channel to access the file. The file number must be determined by the FreeFile function immediately before the Open statement.
DatasetLength: For random access files, set the length of the records.
Só pode modificar o contido dun ficheiro aberto coa instrución Open. Se tenta abrir un ficheiro xa aberto, móstrase unha mensaxe de erro.
Sub ExampleWorkWithAFile Dim iNumber As Integer Dim sLine As String Dim aFile As String Dim sMsg As String aFile = "c:\data.txt" iNumber = Freefile Open aFile For Output As #iNumber Print #iNumber, "This is a line of text" Print #iNumber, "This is another line of text" Close #iNumber iNumber = Freefile Open aFile For Input As iNumber While Not eof(iNumber) Line Input #iNumber, sLine If sLine <>"" Then sMsg = sMsg & sLine & chr(13) End If Wend Close #iNumber MsgBox sMsg End Sub