Microsoft Visual Basic 2005: Reloaded
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1 Microsoft Visual Basic 2005: Reloaded Second Edition Chapter 9 Structures and Sequential Access Files
2 Objectives After studying this chapter, you should be able to: Create a structure Declare and manipulate a structure variable Create an array of structure variables Write information to a sequential access file Align the text written to a sequential access file Microsoft Visual Basic 2005: Reloaded, Second Edition 2
3 Objectives (continued) Read information from a sequential access file Determine whether a file exists Code the FormClosing event Prevent a form from closing Microsoft Visual Basic 2005: Reloaded, Second Edition 3
4 Structures Structure statement: creates your own data type User-defined data type (or structure): data types created by using the Structure statement Member variables: variables defined within a structure Structure can include member variables of: Any of the standard data types Other structure types Microsoft Visual Basic 2005: Reloaded, Second Edition 4
5 Structures (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 5
6 Using a Structure to Declare a Variable Structure variables: variables declared using a structure Refer to an entire structure in code using its name Refer to a member variable using the structure name with the dot operator and the member variable name Member variables can be used like any other variables Structures are used to group related items into one unit Microsoft Visual Basic 2005: Reloaded, Second Edition 6
7 Using a Structure to Declare a Variable (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 7
8 Using a Structure to Declare a Variable (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 8
9 Passing a Structure Variable to a Procedure Microsoft Visual Basic 2005: Reloaded, Second Edition 9
10 Passing a Structure Variable to a Procedure (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 10
11 Passing a Structure Variable to a Procedure (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 11
12 Passing a Structure Variable to a Procedure (continued) Sample application using a structure: Less code to pass a structure variable to a procedure Stores all of the data in a single unit Microsoft Visual Basic 2005: Reloaded, Second Edition 12
13 Passing a Structure Variable to a Procedure (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 13
14 Passing a Structure Variable to a Procedure (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 14
15 Creating an Array of Structure Variables Use a one-dimensional array of structure variables instead of two-dimensional or parallel onedimensional arrays Refer to a member variable in an array element by: arrayname(subscript).membervariablename Microsoft Visual Basic 2005: Reloaded, Second Edition 15
16 Creating an Array of Structure Variables (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 16
17 Creating an Array of Structure Variables (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 17
18 Creating an Array of Structure Variables (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 18
19 Creating an Array of Structure Variables (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 19
20 Creating an Array of Structure Variables (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 20
21 File Types Reading a file: getting information from a file Writing to a file: sending information to a file Output files: files to which information is written Input files: files that are read by the computer Three types of files in Visual Basic: Sequential Random Binary Microsoft Visual Basic 2005: Reloaded, Second Edition 21
22 File Types (continued) Sequential file: data is accessed sequentially, in consecutive order from the beginning to the end Random file: data can be accessed in consecutive or random order Binary file: data is accessed by its byte location in the file Microsoft Visual Basic 2005: Reloaded, Second Edition 22
23 Sequential Access Files Sequential access file: often called a text file because it is composed of lines of text Data must be read sequentially from beginning to end Microsoft Visual Basic 2005: Reloaded, Second Edition 23
24 Sequential Access Files (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 24
25 Writing Information to a Sequential WriteAllText method: Access File Writes information to a sequential access file File argument: contains the name of the file to be used Text argument: contains the data to be written Append argument: if True, data is added to end of existing file; otherwise all existing data is erased Microsoft Visual Basic 2005: Reloaded, Second Edition 25
26 Writing Information to a Sequential Access File (continued) My feature: exposes a set of commonly used objects to the programmer My.Computer object: allows access to objects and methods to manipulate files Computer uses a file pointer to trace where the next character will be read from or written to a file Strings.Space method: writes a specific number of spaces to a file Microsoft Visual Basic 2005: Reloaded, Second Edition 26
27 Writing Information to a Sequential Access File (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 27
28 Aligning Columns of Information in a Sequential Access File PadLeft, PadRight methods: Pads a string with a specified number of characters based on current length of the string being padded Aligns columns of information written to a sequential access file Aligns columns of numeric information by the decimal point Microsoft Visual Basic 2005: Reloaded, Second Edition 28
29 Aligning Columns of Information in a Sequential Access File (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 29
30 Aligning Columns of Information in a Sequential Access File (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 30
31 Reading Information from a Sequential Access File ReadAllText method: reads information stored in a sequential access file File argument: contains the name of the sequential access file Microsoft Visual Basic 2005: Reloaded, Second Edition 31
32 Reading Information from a Sequential Access File (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 32
33 Determining Whether a File Exists An attempt to read a file that does not exist will cause an error FileExists method: determines if the file exists before attempting to read it File argument: contains the name of the file Microsoft Visual Basic 2005: Reloaded, Second Edition 33
34 Determining Whether a File Exists (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 34
35 The FormClosing Event FormClosing event: Occurs when a form is about to be closed by the program code or by the user Allows you to trap the closing action and take any necessary actions such as saving data Can be used to cancel the close action Set e.cancel = True to cancel the closing action Microsoft Visual Basic 2005: Reloaded, Second Edition 35
36 The FormClosing Event (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 36
37 The Friends Application Microsoft Visual Basic 2005: Reloaded, Second Edition 37
38 The Friends Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 38
39 The Friends Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 39
40 The Friends Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 40
41 The Friends Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 41
42 Programming Tutorial Microsoft Visual Basic 2005: Reloaded, Second Edition 42
43 Programming Example Microsoft Visual Basic 2005: Reloaded, Second Edition 43
44 Summary Structure statement: defines a user-defined data type or structure Structure variable contains one or more member variables Structure variable can be passed to procedures Create a one-dimensional array of structure variables Use the dot member access operator to access the structure member variables Microsoft Visual Basic 2005: Reloaded, Second Edition 44
45 Summary (continued) Application can read from and write to a file Sequential access files are always accessed in consecutive (sequential) order from beginning to end ReadAllText method: reads text from a sequential access file WriteAllText method: writes text to a sequential access file Use Strings.Space, PadLeft, and PadRight methods to align data in a sequential access file Microsoft Visual Basic 2005: Reloaded, Second Edition 45
46 Summary (continued) FileExists method: determines if a file exists before trying to read from it FormClosing event: occurs when the form is about to be closed Use the FormClosing event to save data or to prevent a form from being closed Microsoft Visual Basic 2005: Reloaded, Second Edition 46
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