BUG: EXE Crashes on Windows NT when Icon has More Than 256 colors

• Microsoft Visual FoxPro for Windows, versions 5.0, 5.0a, 6.0
  on the following platforms: winnt

SYMPTOMS

When building a Microsoft Visual FoxPro (VFP) executable, it is common practice to attach a custom icon to it. Usually, the custom icon contains two or more resources. This allows the icon to be displayed in various Windows views (small icons, large icons, details, and so forth). If the custom icon contains a 16x16 resource with more than 256 colors, the resulting .exe file does not run on Microsoft Windows NT 4. When the .exe file is started, it immediately exits with a memory error.

RESOLUTION

Build the 16x16 resource in the custom icon with 256 colors or fewer.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

1. Using Microangelo (manufactured by Impact Software: http://www.impactsoft.com/muangelo/muangelo.html) or some other icon editor, create an icon. Include a 32x32 resource with 256 colors, and a 16x16 resource with more than 256 colors.



2. Open Visual FoxPro 6.0 and create a new project.



3. Add a new program to the project with one line of code:




MESSAGEBOX("HELLO!") 

4. With the project selected, press the CTRL+J key combination to bring up the Project Information window.



5. Use the Attach Icon checkbox to attach the icon created in step 1 to the project.



6. Build the project into an executable.



7. Run the .exe file on a computer running Microsoft Windows NT 4, and note that one of the following error messages appears:




APPLICATION ERROR. The instruction at <memory address> referenced memory at <memory address>. The memory could not be "read".

An application error has occurred and an application error log is being generated. <exe name>
Exception: access violation:<memory address>, Address:<memory address>

Fatal error: Exception code: C0000005

REFERENCES

For additional information about creating icons for use with Visual FoxPro executables, click the article numbers below to view the articles in the Microsoft Knowledge Base:

Q136044 How to Make ImagEdit Create 16X16 Icons

Q149589 How to Ensure that Custom Icons Show Up in Windows 95 Explorer

Additional query words:

Keywords : kbAppSetup kbVFp500a kbVFp500abug kbVFp600 kbVFp600bug kbGrpFox kbDSupport kbCodeSnippet
Version : WINDOWS:5.0,5.0a,6.0
Platform : WINDOWS
Issue type : kbbug