Microsoft KB Archive/175618
PRB: Error 0x80020004 (-2147352572) When Setting a Property
The information in this article applies to:
- Microsoft Win32 Software Development Kit (SDK)
This behavior is necessary because some OLE Automation servers, as a result of their language structure, cannot differentiate between a property get or put and a method call. This specially named argument case is used to determine what is actually going on.
"Inside OLE," Kraig Brocksmidt, Chapter 14, "The IDispatch interface" section, Microsoft Press, 1995
You get the error DISP_E_PARAMNOTFOUND when you try to set a property.
The DISPPARAMS structure must be initialized in a special way for DISPATCH_PROPERTYPUT or DISPATCH_PROPERTYPUTREF.
When you use IDispatch::Invoke() with DISPATCH_PROPERTYPUT or DISPATCH_PROPERTYPUTREF, you have to specially initialize the cNamedArgs and rgdispidNamedArgs elements of your DISPPARAMS structure with the following:
DISPID dispidNamed = DISPID_PROPERTYPUT;
dispparams.cNamedArgs = 1;
dispparams.rgdispidNamedArgs = &dispidNamed;
This behavior is by design.
Additional query words: Visual C++ DISP_E_PARAMNOTFOUND "Parameter not found"
Keywords : kberrmsg kbnokeyword kbKernBase kbGrpDSKernBase
Issue type : kbprb
Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch kbWin32sSearch
Last Reviewed: January 16, 2000