Visual Basic 6 Programming Blue Book: The Most Complete, Hands-On Resource for Writing Programs with Microsoft Visual Basic 6!:File Management
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Table 14.4 The File object’s methods.



Method
Description


Copy dest [, overwrite]
Copies the file to dest. An existing file is overwritten only if overwrite is True (the default).

Move dest
Moves the file to dest.

Delete [force]
Deletes the files. Read-only files are deleted only if force is True. The default is False.

OpenAsTextStream
Opens the file and returns a TextStream object. See Chapter 13 for details.







Table 14.5 The File object’s properties.



Property
Description

Attributes
Returns a value summarizing the file’s attributes, as explained in detail later.

DateCreated
Date and time the file was created.

DateLastAccessed
Date and time the file was last accessed.

DateLastModified
Date and time the file was last modified.

Drive
Drive letter of the drive where the file resides.

Name
Sets or returns the name of the file.

ParentFolder
Returns a Folder object representing the file’s parent folder.

Path
The path of the file, including drive letter.

ShortName
The short file name used by programs that require the old 8.3 style naming convention.

ShortPath
The short path used by programs that require the old 8.3 style naming convention.

Size
The size, in bytes, of the file.

Type
Returns information about the type of the file (explained in more detail later).







Table 14.6 Values of the Attribute property.



Attribute
Value
Description

Normal
0
Normal file. No attributes are set.

ReadOnly
1
Read-only file. Read/write.

Hidden
2
Hidden file. Read/write.

System
4
System file. Read/write.

Volume
8
Disk drive volume label. Read-only.

Directory
16
Folder or directory. Read-only.

Archive
32
File has changed since last backup. Read/write.

Alias
64
Link or shortcut. Read-only.

Compressed
128
Compressed file. Read-only.




You use Visual Basic’s logical operators to convert between individual file attributes and the value of the Attributes property. Use And to determine if a specific attribute is set. If f is a File object, then we can write the following code to determine if the file’s Archive attribute is set:


If f.Attributes And 32 Then
‘ Archive attribute is set.
Else
‘ Archive attribute is not set.
End If


Likewise, the following code checks to see if the file’s ReadOnly attribute is set and, if it is, clears it:


If f.Attributes And 1 Then
f.Attributes = f.Attributes - 1
End If


To perform the reverse—setting the ReadOnly attribute if it is not already set—we would write the following:


If Not f.Attributes And 1 Then
f.Attributes = f.Attributes + 1
End If


The File-Related Controls
Most of what you will do with files in Visual Basic will use the Basic statements, functions, and objects presented so far. Other types of file access—such as loading a picture into a Picture Box control—are handled more or less automatically by the associated control. Three Visual Basic controls, however, have been designed specifically to work with files: FileListBox, DirListBox, and DriveListBox. These controls are the topic of this section.

The file-related controls are designed to help you navigate your system’s disk drives. Think of how things are arranged on the disk. Each disk, or drive, is identified by a letter followed by a colon. On each drive are one or more folders, or subdirectories, arranged in a hierarchical structure. In each folder are one or more files, each with its own name. A folder can also contain other folders, or it can be empty. Thus, locating any file is a three-tiered process: drive, folder, file name. One control is designed to deal with each of these three levels.



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