Microsoft KB Archive/194409

= SAMPLE: RESFILE.EXE Stores Any File Type in a Resource File =

Article ID: 194409

Article Last Modified on 8/9/2004

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APPLIES TO


 * Microsoft Visual Basic 5.0 Learning Edition
 * Microsoft Visual Basic 6.0 Learning Edition
 * Microsoft Visual Basic 5.0 Professional Edition
 * Microsoft Visual Basic 6.0 Professional Edition

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This article was previously published under Q194409



SUMMARY
RESFILE.EXE is a sample project that shows how to store any file type in a resource file and retrieve the file for use at run-time.



MORE INFORMATION
The following files are available for download from the Microsoft Download Center:

Resfile.exe

Release Date: Oct-19-1998

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

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Programmers often want to use files with their application, but do not want to install these files into the application directory for fear that the user might delete or modify them. Examples of this include an RTF or Word file for a "Readme" file, GIF and JPG files for images, or MIDI files for sound and data files.

One of the ways to distribute these required files is to include them in a resource file. The resource file is compiled into the EXE. This makes the included files available to the program, but keeps the user from being able to modify them.

A resource file can contain any type of data. It can load certain types of data directly, such as bitmaps, icons, and strings using LoadResPicture and LoadResString. Other types of data must be stored in the resource file as a "custom" resource. Custom resources must be retrieved from the resource file using the LoadResData function intrinsic to Visual Basic.

Although the Visual Basic Help file says "The data that LoadResData loads from the resource file can be up to 64K," this is a limitation for the 16- bit versions of Visual Basic. The 32-bit versions of Visual Basic have no problem reading larger amounts of data.

To use the custom resource, you can simply use the LoadResData function to retrieve the resource into a byte array, then save the byte array to a temporary file, use the file, and then delete the temporary file.

The Resfile.exe sample has a reusable module for handling these resource file operations. This module has two functions to make the resource file tasks easier.


 * LoadPictureResource - This function saves a custom resource to disk and then executes the LoadPicture function to return the Picture object. This is useful for including GIF and JPG files in a resource file. These files are considerably smaller than a BMP, thereby making the resulting EXE smaller.
 * SaveResItemToDisk - This function simply saves a resource item to disk. Programmers can then deal with the file just as they would with any external file.

NOTE: The Resfile sample project included is heavily commented; you may wish to examine the code to gain a better understanding of the operation of these functions.

Additional query words: Resfile

Keywords: kbhowto kbdownload kbaddin kbfile kbsample KB194409

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