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    QTP – FSO (File System Object)

    FSO: File System Object

    What is FSO: 
    FSO is a QTP object model, through which QTP / VB Scripting allows users to process / manipulate system drives, folders and files
    What can FSO do:
    FSO deals with files (text files) / Folders & Drives (system folders/drives)
    FSO is useful for:
    To create files / add data / remove data / copy files / delete files / save files and so on.

    Creating Files
    To create an empty text file use the CreateTextFile method.
    The following example demonstrates how to create a text file using theCreateTextFile method.

    Dim fso, f1
    Set fso = CreateObject("Scripting.FileSystemObject")
    Set f1 = fso.CreateTextFile("C:\testfile.txt", True)  
    ' True to overwrite if there is already a file

    Opening Files
    To open existing files use “OpenTextFile” method of the FileSystemObjectobject with the ForWriting flag (true/false).

    Dim fso, file
    Const ForWriting = 2           
    ' Here ForWriting = 2  is a constant for writing  data to a file
    Set fso = CreateObject("Scripting. FileSystemObject")
    Set file = fso.OpenTextFile("C:\test.txt", ForWriting, True)
    ' True indicates whether a new file can be created if the specified filename doesn't exist

    ' Another method OpenAsTextStream to open a text file

    Dim fso, file, file1
    Const ForWriting = 2 
    ' Here ForWriting = 2  is a constant for writing  data to a file
    Set fso = CreateObject("Scripting.FileSystemObject")
    fso.CreateTextFile ("c:\test1.txt")
    ' To get a file
    Set file = fso.GetFile("c:\test1.txt")
    ' To Open a file
    Set file1 = file.OpenAsTextStream(ForWriting, True)
    ' True indicates whether a new file can be created if the specified filename doesn't exist

    Writing data to the File
    Once the text file is created, add data to the file using the following three steps:
    ·         Open the text file.
    ·         Write the data.
    ·         Close the file.

    To open an existing file, use either the OpenTextFile method of the FileSystemObject object or the OpenAsTextStreammethod of the File object.

    To write data to the open text file, use the below methods
    Write             
    WriteLine      
    WriteBlankLines       

    The following table describes which method to use for various tasks

    Method
    Task
    Write
    Write data to an open text file without a trailing newline character.
    WriteLine
    Write data to an open text file with a trailing newline character.
    WriteBlankLines
    Write one or more blank lines to an open text file.

    To close an open file, use the Close method of the TextStream object.

    Consider the below example:

    Function CreateFile()
       Dim fso, file
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set file = fso.CreateTextFile("c:\testfile.txt", True)
       ' Write a line with a newline character.
       file.WriteLine(" Hey, Write my Name here :::G A Reddy :):):) .")
       ' Write three newline characters to the file.       
       file.WriteBlankLines(3)
       ' Write a line.
       file.Write ("This is a test text : writing into a file.")
       file.Close
    End  Function

    Reading data from Files

    To read data from a text file, use the 
    Read
    ReadLine
    ReadAll 
    These methods are from the TextStream object.

    The following table describes which method to use for various tasks.

    Method
    Task
    Read
    Read a specified number of characters from a file.
    ReadLine
    Read an entire line (up to, but not including, the newline character).
    ReadAll
    Read the entire contents of a text file.

    If you use the Read or ReadLine method and want to skip to a particular portion of data, use the Skip or SkipLine method. The resulting text of the read methods is stored in a string which can be displayed in a control, parsed by string functions (such as Left, Right, and Mid), concatenated, and so on.
    The following example demonstrates how to open a file, write data to it and then read from it:

    Function ReadFiles()
       Dim fso, file, file1, str
       Const ForReading = 1
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set file = fso.CreateTextFile("C:\testfile.txt", True)
       ' Write a line.
     Print  "Started Writing data to a file"
      file.WriteLine "Hey, How are you my Friend"
       file.WriteBlankLines(1)
       file.Close
       ' Read the contents of the file
          Print  "Started Reading data from file "
       Set file1 = fso.OpenTextFile("c:\testfile.txt", ForReading)
       str= file1.ReadLine
       Print  "File contents = '" & str & "'"
       file1.Close
    End Function

    Moving, Copying, and Deleting Files

    The FSO object model has two methods each for moving, copying, and deleting files, as described in the following table.

    Method
    Task
    File.Move or FileSystemObject.MoveFile
    To Move a file
    File.Copy or FileSystemObject.CopyFile
    To Copy a file
    File.Delete or FileSystemObject.DeleteFile
    To Delete a file

    The following example creates a text file in the root directory of drive C, writes some information to it, moves it to a directory called \temp1, makes a copy of it in a directory called \temp2, then deletes the copies from both directories.
    To run the following example, create directories named \temp1 and \temp2 in the root directory of drive C:

    Function ManipFiles()
       Dim fso, file1, file2, str
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set file1 = fso.CreateTextFile("c:\testfile.txt", True)
                Print  "Writing file "
       ' Write a line.
       file1.Write ("My Friend, I am teaching about Copying and moving a file ")
       ' Close the file to writing.
       file1.Close
                Print    "Moving file to c:\temp1"
       ' Get a handle to the file in root of C:\.
       Set file2 = fso.GetFile("c:\testfile.txt")
       ' Move the file to \temp1 directory.
       file2.Move ("c:\temp1\testfile.txt")
                Print  "Copying file to c:\temp2"
       ' Copy the file to \temp2.
       file2.Copy ("c:\temp2\testfile.txt")
                Print  "Deleting files now"
       ' Get handles to files' current location.
       Set file2 = fso.GetFile("c:\temp1\testfile.txt")
       Set file3 = fso.GetFile("c:\temp2\testfile.txt")
       ' Delete the files.
       file2.Delete
       file3.Delete
        Print  "Files operation copying and moving and deleting  is complete :) "
    End Function

    QTP and FSO Methods:

    Adds a key and item pair to a Dictionary object.

    Adds a new folder to a Folders collection.

    Appends a name to an existing path.

    Closes an open TextStream file.

    Copies a specified file or folder from one location to another.

    Copies one or more files from one location to another.

    Recursively copies a folder from one location to another.

    Creates a folder.

    Creates a specified file name and returns a TextStream object that can be used to read from or write to the file.

    Deletes a specified file or folder.

    Deletes a specified file.

    Deletes a specified folder and its contents.

    Returns true if the specified drive exists; false if it does not.

    Returns true if a specified key exists in the Dictionary object, false if it does not.

    Returns true if a specified file exists; false if it does not.

    Returns true if a specified folder exists; false if it does not.

    Returns a complete and unambiguous path from a provided path specification.

    Returns a string containing the base name of the last component, less any file extension, in a path.

    Returns a Drive object corresponding to the drive in a specified path.

    Returns a string containing the name of the drive for a specified path.

    Returns a string containing the extension name for the last component in a path.

    Returns a File object corresponding to the file in a specified path.

    Returns the last component of specified path that is not part of the drive specification.

    Returns the version number of a specified file.

    Returns a Folder object corresponding to the folder in a specified path.

    Returns a string containing the name of the parent folder of the last component in a specified path.

    Returns the special folder object specified.

    Returns a TextStream object corresponding to the standard input, output, or error stream.

    Returns a randomly generated temporary file or folder name that is useful for performing operations that require a temporary file or folder.

    Returns an array containing all the items in a Dictionary object.

    Returns an array containing all existing keys in a Dictionary object.

    Moves a specified file or folder from one location to another.

    Moves one or more files from one location to another.

    Moves one or more folders from one location to another.

    Opens a specified file and returns a TextStream object that can be used to read from, write to, or append to the file.

    Opens a specified file and returns a TextStream object that can be used to read from, write to, or append to the file.

    Reads a specified number of characters from a TextStream file and returns the resulting string.

    Reads an entire TextStream file and returns the resulting string.

    Reads an entire line (up to, but not including, the newline character) from aTextStream file and returns the resulting string.

    Removes a key, item pair from a Dictionary object.

    Removes all key, item pairs from a Dictionary object.

    Skips a specified number of characters when reading a TextStream file.

    Skips the next line when reading a TextStream file.

    Writes a specified string to a TextStream file.

    Writes a specified number of newline characters to a TextStream file.

    Writes a specified string and newline character to a TextStream file.
    Related Sections

    List of elements that make up Scripting Run-Time Reference.


    Note: All these FSO methods and functions are explained clearly (example by example) in trainings or in later editions

    Reactions:

    QTP - FSO (PART 1)

    QTP – FSO (File System Object)

    FSO: File System Object

    What is FSO: 
    FSO is a QTP object model, through which QTP / VB Scripting allows users to process / manipulate system drives, folders and files
    What can FSO do:
    FSO deals with files (text files) / Folders & Drives (system folders/drives)
    FSO is useful for:
    To create files / add data / remove data / copy files / delete files / save files and so on.

    Creating Files
    To create an empty text file use the CreateTextFile method.
    The following example demonstrates how to create a text file using theCreateTextFile method.

    Dim fso, f1
    Set fso = CreateObject("Scripting.FileSystemObject")
    Set f1 = fso.CreateTextFile("C:\testfile.txt", True)  
    ' True to overwrite if there is already a file

    Opening Files
    To open existing files use “OpenTextFile” method of the FileSystemObjectobject with the ForWriting flag (true/false).

    Dim fso, file
    Const ForWriting = 2           
    ' Here ForWriting = 2  is a constant for writing  data to a file
    Set fso = CreateObject("Scripting. FileSystemObject")
    Set file = fso.OpenTextFile("C:\test.txt", ForWriting, True)
    ' True indicates whether a new file can be created if the specified filename doesn't exist

    ' Another method OpenAsTextStream to open a text file

    Dim fso, file, file1
    Const ForWriting = 2 
    ' Here ForWriting = 2  is a constant for writing  data to a file
    Set fso = CreateObject("Scripting.FileSystemObject")
    fso.CreateTextFile ("c:\test1.txt")
    ' To get a file
    Set file = fso.GetFile("c:\test1.txt")
    ' To Open a file
    Set file1 = file.OpenAsTextStream(ForWriting, True)
    ' True indicates whether a new file can be created if the specified filename doesn't exist

    Writing data to the File
    Once the text file is created, add data to the file using the following three steps:
    ·         Open the text file.
    ·         Write the data.
    ·         Close the file.

    To open an existing file, use either the OpenTextFile method of the FileSystemObject object or the OpenAsTextStreammethod of the File object.

    To write data to the open text file, use the below methods
    Write             
    WriteLine      
    WriteBlankLines       

    The following table describes which method to use for various tasks

    Method
    Task
    Write
    Write data to an open text file without a trailing newline character.
    WriteLine
    Write data to an open text file with a trailing newline character.
    WriteBlankLines
    Write one or more blank lines to an open text file.

    To close an open file, use the Close method of the TextStream object.

    Consider the below example:

    Function CreateFile()
       Dim fso, file
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set file = fso.CreateTextFile("c:\testfile.txt", True)
       ' Write a line with a newline character.
       file.WriteLine(" Hey, Write my Name here :::G A Reddy :):):) .")
       ' Write three newline characters to the file.       
       file.WriteBlankLines(3)
       ' Write a line.
       file.Write ("This is a test text : writing into a file.")
       file.Close
    End  Function

    Reading data from Files

    To read data from a text file, use the 
    Read
    ReadLine
    ReadAll 
    These methods are from the TextStream object.

    The following table describes which method to use for various tasks.

    Method
    Task
    Read
    Read a specified number of characters from a file.
    ReadLine
    Read an entire line (up to, but not including, the newline character).
    ReadAll
    Read the entire contents of a text file.

    If you use the Read or ReadLine method and want to skip to a particular portion of data, use the Skip or SkipLine method. The resulting text of the read methods is stored in a string which can be displayed in a control, parsed by string functions (such as Left, Right, and Mid), concatenated, and so on.
    The following example demonstrates how to open a file, write data to it and then read from it:

    Function ReadFiles()
       Dim fso, file, file1, str
       Const ForReading = 1
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set file = fso.CreateTextFile("C:\testfile.txt", True)
       ' Write a line.
     Print  "Started Writing data to a file"
      file.WriteLine "Hey, How are you my Friend"
       file.WriteBlankLines(1)
       file.Close
       ' Read the contents of the file
          Print  "Started Reading data from file "
       Set file1 = fso.OpenTextFile("c:\testfile.txt", ForReading)
       str= file1.ReadLine
       Print  "File contents = '" & str & "'"
       file1.Close
    End Function

    Moving, Copying, and Deleting Files

    The FSO object model has two methods each for moving, copying, and deleting files, as described in the following table.

    Method
    Task
    File.Move or FileSystemObject.MoveFile
    To Move a file
    File.Copy or FileSystemObject.CopyFile
    To Copy a file
    File.Delete or FileSystemObject.DeleteFile
    To Delete a file

    The following example creates a text file in the root directory of drive C, writes some information to it, moves it to a directory called \temp1, makes a copy of it in a directory called \temp2, then deletes the copies from both directories.
    To run the following example, create directories named \temp1 and \temp2 in the root directory of drive C:

    Function ManipFiles()
       Dim fso, file1, file2, str
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set file1 = fso.CreateTextFile("c:\testfile.txt", True)
                Print  "Writing file "
       ' Write a line.
       file1.Write ("My Friend, I am teaching about Copying and moving a file ")
       ' Close the file to writing.
       file1.Close
                Print    "Moving file to c:\temp1"
       ' Get a handle to the file in root of C:\.
       Set file2 = fso.GetFile("c:\testfile.txt")
       ' Move the file to \temp1 directory.
       file2.Move ("c:\temp1\testfile.txt")
                Print  "Copying file to c:\temp2"
       ' Copy the file to \temp2.
       file2.Copy ("c:\temp2\testfile.txt")
                Print  "Deleting files now"
       ' Get handles to files' current location.
       Set file2 = fso.GetFile("c:\temp1\testfile.txt")
       Set file3 = fso.GetFile("c:\temp2\testfile.txt")
       ' Delete the files.
       file2.Delete
       file3.Delete
        Print  "Files operation copying and moving and deleting  is complete :) "
    End Function

    QTP and FSO Methods:

    Adds a key and item pair to a Dictionary object.

    Adds a new folder to a Folders collection.

    Appends a name to an existing path.

    Closes an open TextStream file.

    Copies a specified file or folder from one location to another.

    Copies one or more files from one location to another.

    Recursively copies a folder from one location to another.

    Creates a folder.

    Creates a specified file name and returns a TextStream object that can be used to read from or write to the file.

    Deletes a specified file or folder.

    Deletes a specified file.

    Deletes a specified folder and its contents.

    Returns true if the specified drive exists; false if it does not.

    Returns true if a specified key exists in the Dictionary object, false if it does not.

    Returns true if a specified file exists; false if it does not.

    Returns true if a specified folder exists; false if it does not.

    Returns a complete and unambiguous path from a provided path specification.

    Returns a string containing the base name of the last component, less any file extension, in a path.

    Returns a Drive object corresponding to the drive in a specified path.

    Returns a string containing the name of the drive for a specified path.

    Returns a string containing the extension name for the last component in a path.

    Returns a File object corresponding to the file in a specified path.

    Returns the last component of specified path that is not part of the drive specification.

    Returns the version number of a specified file.

    Returns a Folder object corresponding to the folder in a specified path.

    Returns a string containing the name of the parent folder of the last component in a specified path.

    Returns the special folder object specified.

    Returns a TextStream object corresponding to the standard input, output, or error stream.

    Returns a randomly generated temporary file or folder name that is useful for performing operations that require a temporary file or folder.

    Returns an array containing all the items in a Dictionary object.

    Returns an array containing all existing keys in a Dictionary object.

    Moves a specified file or folder from one location to another.

    Moves one or more files from one location to another.

    Moves one or more folders from one location to another.

    Opens a specified file and returns a TextStream object that can be used to read from, write to, or append to the file.

    Opens a specified file and returns a TextStream object that can be used to read from, write to, or append to the file.

    Reads a specified number of characters from a TextStream file and returns the resulting string.

    Reads an entire TextStream file and returns the resulting string.

    Reads an entire line (up to, but not including, the newline character) from aTextStream file and returns the resulting string.

    Removes a key, item pair from a Dictionary object.

    Removes all key, item pairs from a Dictionary object.

    Skips a specified number of characters when reading a TextStream file.

    Skips the next line when reading a TextStream file.

    Writes a specified string to a TextStream file.

    Writes a specified number of newline characters to a TextStream file.

    Writes a specified string and newline character to a TextStream file.
    Related Sections

    List of elements that make up Scripting Run-Time Reference.


    Note: All these FSO methods and functions are explained clearly (example by example) in trainings or in later editions