WISE OWL EXERCISES
VISUAL BASIC EXERCISES
VISUAL BASIC EXERCISES
- Drawing forms (2)
- Form events (1)
- Variables and data types (2)
- Enumerations and constants (2)
- Form validation (3)
- Menus and toolbars (2)
- Files and folders (1)
- Basic DataGridViews (1)
- Reacting to DataGridView events (3)
- Advanced DataGridViews (2)
- Creating classes (4)
- Coding in VB.NET (2)
- Variables and constants (3)
- Testing conditions (2)
- Passing arguments (3)
- Using arrays (2)
- Loops (2)
- Working with files (3)
- Lists (3)
- Creating properties (3)
Visual Basic | Working with files exercise | Write a VB routine to hunt for hidden text in files
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
You can learn how to do this exercise on the relevant Wise Owl classroom training course (sadly for the moment only in the UK).
| Software ==> | Visual Basic (46 exercises) |
| Version ==> | Any version of VB |
| Topic ==> | Working with files (3 exercises) |
| Level ==> | Average difficulty |
You need a minimum screen resolution of about 700 pixels width to see our exercises. This is because they contain diagrams and tables which would not be viewable easily on a mobile phone or small laptop. Please use a larger tablet, notebook or desktop computer, or change your screen resolution settings.
Press CTRL + D to add the file called frmHuntKilroy.vb from the above folder into your project (or right click on the project and choose to add it as an existing item).
Change your project's properties to make this the default form for your project. When you run your project, you should see this:
To find where the given text is hidden in text files, click on this button.
You can now select the files which you want to search:
The form includes code to bring up a dialog box. You can then select the files in which you want to search (they're C# ones - apologies) for the hidden text Kilroy.
Included in the code-behind is the following excerpt
'loop over all files selected ...
Dim EachFile As String
For Each EachFile In dfoFile.FileNames
'**************************************************
'AT THIS POINT EachFile holds the name of each file
'**************************************************
Next EachFile
Remove the commented out code, and replace it with code to read in the files that a user has selected line by line, announcing every time that a line containing Kilroy is found. Here's what this announcement might look like::
Your version of this message box will include the name of the file, and perhaps even the line number!
When your system is working, close down your application and any files that you have open.