PRB: In-Process Server Fails on CREATEOBJECT in VFP Run Time (162081)


The information in this article applies to:

  • Microsoft Visual FoxPro for Windows 5.0
This article was previously published under Q162081

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.
Step 2 is required because Visual FoxPro looks in the System folder before looking in the current folder. VFP 5.0a does not need Step 2 because the stub loader looks in the current folder for Vfp500.dll.

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).
Modification Type:MajorLast Reviewed:8/6/1999
Keywords:kbenv kbprb KB162081
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