Microsoft KB Archive/51095

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Excel: Crashes/Unexpectedly Quits When Calling Code Resource



The information in this article applies to:


  • Microsoft Excel for the Macintosh, versions 2.2, 3.0, 4.0





SUMMARY

Microsoft Excel can call routines that have been compiled as code resources (sometimes referred to as dynamic link libraries, or DLLs).

If Excel crashes or unexpectedly quits when calling the code resource, make sure the routine runs correctly by compiling it as an application and running it stand alone. You may need to hard-code values that would normally be passed from Excel. After verifying that the routine runs as expected as an application, recompile the routine as a code resource.

The most common cause of Excel crashing when calling a code resource is incorrectly passed parameters. If the return type is incorrectly specified (such as declaring a pointer to a floating-point value and returning an integer), volatile information may be overwritten when the code resource tries to pass the value back to Excel. This may result in a system hang or Excel unexpectedly quitting. Check the passed and returned argument types in the REGISTER command function. The number and type of arguments passed must match those specified in the REGISTER command function, with the type passed back to Excel appearing first. The argument_types specified in the REGISTER command function must be enclosed in quotation marks.

For more information on code resources, query on the following words:


   description and creating and code resource and call register and
   routine and floating and point and decimal 

Additional query words:

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Last Reviewed: March 15, 1999
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