PRB: In-Process Server Fails on CREATEOBJECT in VFP Run Time

• Microsoft Visual FoxPro for Windows, version 5.0

SYMPTOMS

Doing a CREATEOBJECT on a Visual FoxPro in-process OLE-server inside a Visual FoxPro run-time application gives the following error messages:

Windows 95: "This program has performed an illegal operation and will be shut down"

Windows NT: "The instruction at <memory address> referenced memory at <memory address>. The memory could not be read"

CAUSE

The run-time .exe file and the in-process OLE-server .dll file are using the same instance of Vfp500.dll, which has global variables that have different values depending on whether it is called from a .dll file or an .exe file .

RESOLUTION

NOTE: Your .exe file and your in-process server .dll file need to be in different folders, and each needs its own set of Visual FoxPro run-time files.

1. Copy the following Visual FoxPro runtime files from your System folder(System32 on NT) into the directories where your .exe file and .dll file are located:

   
         Vfp500.dll
         Vfp5enu.dll (Last three letters change with localized versions) 




2. Delete the Visual FoxPro run-time files from of your System folder.

MORE INFORMATION

Steps to Reproduce Behavior

1. Create a project called Myserver1.



2. Add a new program file to the project.



3. Enter the following code in the program file:

   
          DEFINE CLASS oleserver as custom OLEPUBLIC
            FUNCTION Hello
               RETURN "Hello World"
            ENDFUNC
          ENDDEFINE 




4. Save the program and build the project as an OLE DLL. (Click the Build button in the Project Manager, then select Build OLE DLL from Build Options, and then click OK.)



5. Create a project called Main.



6. Add a new program file to the project.



7. Enter the following code in the program file:

   
          oMyServer = CREATEOBJECT("myserver1.oleserver")
          s = oMyServer.Hello
          WAIT WINDOW s 




8. Save the program and build the project as an executable. (Click the Build button in the Project Manager, then select Build Executable from Build Options, and then click OK.)



9. Shut down the Visual FoxPro IDE and run the Main.exe you created in step 8 (from the Windows Explorer double-click the Main.exe).

Additional query words:

Keywords : kbenv kbVFp FxenvError
Version : 5.0
Platform : WINDOWS
Issue type : kbprb