XL97: "Bad DLL Calling Convention" When Running a Macro

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DLLs in Microsoft Windows support two main calling conventions: _cdecl and _stdcall. Most 32-bit DLLs that are included with Microsoft Windows 95 and Microsoft Windows NT support the _stdcall calling convention; the _cdecl calling convention is generally used by older DLLs.

If a DLL supports only the _cdecl calling convention, you cannot call functions in that DLL from a Visual Basic macro in Microsoft Excel 97. For example, if your code includes the following function declaration:

   Declare Function memcpy& Lib "Crtdll" (ByRef Dest&, ByVal Src&, _
       ByVal Count&)
				

and then attempts to call the memcpy& function, you will receive the error message described in this article. This behavior occurs because macros in Microsoft Excel 97 cannot call functions that use the _cdecl calling convention.

NOTE: In earlier versions of Microsoft Excel, you can make calls to functions that use the _cdecl calling convention.