Learn Visual Basic 6.0

4. More Exploration of the Visual Basic Toolbox

Open Common Dialog Box

1. The Open common dialog box provides the user a mechanism for specifying the name of a file to open. We�ll worry about how to open a file in Class 6. The box is displayed by using the ShowOpen method. Here�s an example of an Open common dialog box:
   
   
   
   
   
   
2. Open Dialog Box Properties:
   
   

   CancelError	If True, generates an error if the Cancel button is clicked. Allows you to use error-handling procedures to recognize that Cancel was clicked.
   DialogTitle	The string appearing in the title bar of the dialog box. Default is Open. In the example, the DialogTitle is Open Example.
   FileName	Sets the initial file name that appears in the File name box. After the dialog box is closed, this property can be read to determine the name of the selected file.
   Filter	Used to restrict the filenames that appear in the file list box. Complete filter specifications for forming a Filter can be found using on-line help. In the example, the Filter was set to allow Bitmap (*.bmp), Icon (*.ico), Metafile (*.wmf), GIF (*.gif), and JPEG (*.jpg) types (only the Bitmap choice is seen).
   FilterIndex	Indicates which filter component is default. The example uses a 1 for the FilterIndex (the default value).
   Flags	Values that control special features of the Open dialog box (see Appendix II). The example uses no Flags value.

   
   
3. When the user closes the Open File box, you should check the returned file name to make sure it meets the specifications your application requires before you try to open the file.

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