Microsoft KB Archive/101291

= "Invalid Function" with CallFn from FoxTools =

Article ID: 101291

Article Last Modified on 10/15/2003

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APPLIES TO


 * Microsoft Visual FoxPro 3.0 Standard Edition
 * Microsoft FoxPro 2.5b

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This article was previously published under Q101291



SUMMARY
The FOXTOOLS.FLL library is used to call Windows API functions from within FoxPro. However, FOXTOOLS.FLL cannot call a .DLL that requires more than nine parameters. If an attempt is made to call a .DLL with more than nine parameters, FoxPro will return the "Invalid Function, Argument, Type or Count" error message.

The following example demonstrates this problem. It calls a function named "Beep" in a .DLL named "Mydll.dll" with ten parameters. When the CallFn function that is part of FOXTOOLS.FLL is issued, FoxPro returns the error message described above: SET LIBRARY TO SYS(2004)+"FOXTOOLS.FLL"t! test='TEST' handle=REGFN("beep", "CCCCCCCCCC", "", "c:\msvc\example\dlls\mydll.dll") test=CALLFN(handle,test,test,test,test,test,test,test,test,test,test) SET LIBRARY TO



MORE INFORMATION
The functionality of Microsoft FoxPro for Windows can be enhanced by calling a Windows .DLL within FoxPro. FoxPro for Windows comes with a FoxPro application programming interface (API) library that allows FoxPro programs to call Windows DLL functions that meet the criteria as described in the FOXTOOLS.WRI file in the FOXPROW\GOODIES\FOXTOOLS directory. A large number of Windows API functions meet these criteria.

Additional query words: VFoxWin FoxWin 2.50 FOXTOOLS Callfn error

Keywords: kberrmsg KB101291

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