Input# Statement

Reads data from an open sequential file.

الصياغة:

Input #FileNumber As Integer; var1[, var2[, var3[,...]]]

المعاملات:

FileNumber: Number of the file that contains the data that you want to read. The file must be opened with the Open statement using the key word INPUT.

var: A numeric or string variable that you assign the values read from the opened file to.

The Input# statement reads numeric values or strings from an open file and assigns the data to one or more variables. A numeric variable is read up to the first carriage return (Asc=13), line feed (Asc=10), space, or comma. String variables are read to up to the first carriage return (Asc=13), line feed (Asc=10), or comma.

Data and data types in the opened file must appear in the same order as the variables that are passed in the "var" parameter. If you assign non-numeric values to a numeric variable, "var" is assigned a value of "0".

Records that are separated by commas cannot be assigned to a string variable. Quotation marks (") in the file are disregarded as well. If you want to read these characters from the file, use the Line Input# statement to read pure text files (files containing only printable characters) line by line.

If the end of the file is reached while reading a data element, an error occurs and the process is aborted.

مثال:

Sub ExampleWorkWithAFile

Dim iCount As Integer

Dim sName As String

Dim sValue As Integer

Dim sFileName As String

 

sFileName = "c:\data.txt"

iCount = Freefile

 

' Write data ( which we will read later with Input ) to file

Open sFileName For Output As iCount

sName = "Hamburg"

sValue = 200

Write #iCount, sName, sValue

sName = "New York"

sValue = 300

Write #iCount, sName, sValue

sName = "Miami"

sValue = 459

Write #iCount, sName, sValue

Close #iCount

 

iCount = Freefile

' Read data file using Input

Open sFileName For Input As iCount

Input #iCount; sName, sValue

MsgBox sName & " " & sValue

Input #iCount; sName, sValue

MsgBox sName & " " & sValue

Input #iCount; sName, sValue

MsgBox sName & " " & sValue

Close #iCount

End Sub