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DATA FILES
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Writing to a sequential file is handled in a similar manner, as outlined below.
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Private Sub mnuSaveAs_Click() Dim NewFile As String, i As Integer, n As Integer CommonDialog1.ShowSave NewFile = CommonDialog1.FileName Open NewFile For Output As #2 n = . . . . . For i = 0 To n . . . . . 'write each data item to the output file on channel #2 . . . . . Next i Close #2 End Sub
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The CommonDialog1.ShowSave command generates the Save As dialog box, similar to that shown in Fig. 9.5. The file name entered in this dialog box is then assigned to the string variable NewFile. The Open statement specifies that the data file is a sequential output file (i.e., an output text file) associated with data channel #2. The For To-Next loop writes the data to the output file after the data has been processed (the details of which are not shown). Each pass through the loop writes one data item. Note that the value for n is assumed known. The Close statement then closes the file associated with data channel #2. It is also possible to write new information at the end of an existing sequential file. To do so, the above outline might be written as
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Private Sub mnuSaveAs_Click() Dim OldFile As String, i As Integer, n As Integer CommonDialog1.ShowSave OldFile = CommonDialog1.FileName Open OldFile For Append As #1 n = . . . . . For i = 0 To n . . . . . 'write each new data item at the end of the existing file on channel #1 . . . . . Next i Close #1 End Sub
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Note the use of the keyword Append (rather than Input or Output) in the Open statement. This is required when appending information to an existing sequential file. Before leaving this example, we remark that the Open statement is written somewhat differently when working with random or binary files. The details will be discussed later in this chapter.
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9.4 SEQUENTIAL DATA FILES (TEXT FILES) A sequential data file is characterized by the fact that the data is stored sequentially, as plain text (i.e., as ASCII characters). The text is organized into individual lines, with each line ending with ASCII line feed (LF) and carriage return (CF) characters. Each line of text can contain both numeric constants and strings, in any combination.
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DATA FILES
When opening a sequential file, the Open statement is generally written in one three ways, depending on whether the file is an input file, an output file, or an append file, as shown in Example 9.1. The three possibilities are
Open filename For Input As #n
Open filename For Output As #n Open filename For Append As #n
where n refers to the channel number (i.e., the file number). Data items are usually read from a sequential data file via the Input # statement. This statement is written in general terms as
Input #n, data items
where n refers to the channel number and data items refers to the list of input data items, separated by commas. The input data items are typically variables, array elements, control properties, etc. Similarly, data items are usually written to a sequential data file via the Print # statement, which in general terms is written as
Print #n, data items
where the data items can be constants, variables, expressions, array elements, control properties, etc. Now consider the arrangement of the data items within the input data file. Within any line, consecutive numeric constants must be separated by commas. Strings are usually (but not always) enclosed in quotation marks. However, if a string includes commas or blank spaces as a part of the string, it must be enclosed in quotation marks. Consecutive strings that are enclosed in quotation marks need not be separated by commas.
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