Change Case: Uppercase and Lowercase in VB6

Uppercase and Lowercase characters are capital and lowercase letters (big and small. upper:ABCDEFGHIJKLMNOPQRSTUVWXYZ lower: abcdefghijklmnopqrstuvwxyz. In this article, we will going to create a program that can change casing of the letters either uppercase or lowercase when the text is highlighted. Now, let's start this tutorial! 1. Let's start this tutorial by following the following steps in Microsoft Visual Basic 6.0: Open Microsoft Visual Basic 6.0, click Choose Standard EXE, and click Open. 2. Next, add two buttons named Button1 labeled as "Uppercase", Button2 labeled as "Lowercase", and Button3 labeled "Clear". Insert also a Textbox named Text1 for inputting your desired words. You must design your interface like this: design 3. Now put this code for your code module.
  1. Private Sub Command1_Click()
  2. Dim textnotselected As Boolean
  3. If textnotselected = True Then Exit Sub
  4. Text1.SelText = StrConv(Text1.SelText, vbUpperCase)
  6. End Sub
  8. Private Sub Command2_Click()
  9. Dim textnotselected As Boolean
  10. If textnotselected = True Then Exit Sub
  11. Text1.SelText = StrConv(Text1.SelText, vbLowerCase)
  13. End Sub
  15. Private Sub Command3_Click()
  16. Text1.Text = ""
  17. End Sub
We have initialized variable textnotselected as Boolean. This variable is used that if we click any buttons such as uppercase and lowercase button it will not do any events as this variable is set to True. SelText Property returns the text that the user selected in a text-entry area of a control, or returns an empty string ("") if no characters are selected. It also specifies the string containing the selected text of our text1. It is not available at design time; read/write at run time. StrConv Method returns a string converted as specified, the first parameter is the string (Text1.SelText) and the second parameter is the conversion that has enumeration value specifying the type of conversion to perform such as vbLowerCase and vbUpperCase. vbUpperCase converts the string to uppercase characters. vbUpperCase converts the string to lowercase characters.


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