Writing files in vb

EventArgs Handles CloseButton. EventArgs Handles LoadButton. Exists "c:tempsampleFile. Equals prop 0 , textBox. Name Then textBox. Equals prop 0 , comboBox. Name Then comboBox. Equals prop 0 , radioBtn. Name Then radioBtn. Parse prop 1 ElseIf String. Equals prop 0 , RadioButton1. File Dim oRead as System. StreamWriter class for writing to the text file are Write and WriteLine. The difference between these methods is that the WriteLine method appends a newline character at the end of the line while the Write method does not.

Both of these methods are overloaded to write various data types and to write formatted text to the file. The following example demonstrates how to use the WriteLine method: oWrite. The ability to format the output has been significantly improved over previous versions of Visual Basic.

There are several overloaded methods for producing formatted text. Close The overloaded method used in these examples accepts a string to be formatted and then a parameter array of values to be used in the formatted string. The first line writes a header for our report. Each curly brace set consists of two numbers. The first number is the index of the item to be displayed in the parameter array. Notice that the parameter array is zero based.

The second number represents the size of the field in which the parameter will be printed. Alignment of the field can also be defined; positive values are left aligned and negative values are right aligned. The second line demonstrates how to format values of various data types.

The second field will output the current time formatted as PM. The third field will format the value Text objWriter. Close MessageBox. Show "Text written to file". Unless you have a file called " test2. Once again, VB insists that the file must exist before it can actually do something with it.

Which is not unreasonable! In other words, just change the file name back to test. Hopefully, you haven't deleted the test. Run your programme again. Type something into the textbox, and then click your button. You should see the message box "Text written to file" appear. But notice that if you open up the text file itself, any text you had previously will be gone - it has been overwritten, rather than appended to. Double click on the FileSystemWatcher1 object to access the event procedure code and modify the changed event as follows:.

Press F5 to build and run the application and, using Notepad, edit and save the file. As soon as the changes are saved, the "File Changed" MessageBox will appear. Note that the NotifyFilter property can be used to configure which events trigger an notification. Now that we have covered file handling in Visual Basic the next step is to look at directories in Working with Directories in Visual Basic. Jump to: navigation , search. Navigation menu Personal tools.

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