CreateStdDispatch - OLE Programmer's Reference

Custom Search

CreateStdDispatch

(punkOuter, pvThis, ptinfo, ppunkStdDisp)
IUnknown FAR* punkOuter
void FAR* pvThis
ITypeInfo FAR* ptinfo
IUnknown FAR* FAR* ppunkStdDisp

Creates a standard implementation of the IDispatch interface through a single function call. This simplifies exposing objects through OLE Automation.

Parameters
punkOuter
Pointer to the object's IUnknown implementation.

pvThis
Pointer to the object to expose.

ptinfo
Pointer to the type information that describes the exposed object.

ppunkStdDisp
Pointer to the location where the implementation of the IDispatch interface for this object is returned. This pointer is NULL if the function fails.

Return Value
The SCODE obtained from the returned HRESULT is one of the following:

SCODE	Meaning
S_OK	Success.
E_INVALIDARG	One of the first three arguments is invalid.
E_OUTOFMEMORY	There was insufficient memory to complete the operation.

Comments
You can use CreateStdDispatch when you create an object instead of implementing the IDispatch member functions for the object. The implementation that CreateStdDispatch creates has these limitations:

Supports only one national language
Supports only dispatch-defined exception codes returned from Invoke

LoadTypeLib, GetTypeInfoOfGuid, and CreateStdDispatch comprise the minimum set of functions you need to cal l to expose an object using a type library. For more information on LoadTypeLib and GetTypeInfoOfGuid, see Chapter 8, "Type Description Interfaces."

CreateDispTypeInfo and CreateStdDispatch comprise the minimum set of dispatch components you need to call to expose an object using type information provided by the INTERFACEDATA structure.

Example
The following code implements the IDispatch interface for the CCalc class using CreateStdDispatch.

CCalc FAR*

CCalc::Create()

{

HRESULT hresult;

CCalc FAR* pcalc;

CArith FAR* parith;

ITypeInfo FAR* ptinfo;

IUnknown FAR* punkStdDisp;

extern INTERFACEDATA NEARDATA g_idataCCalc;

if((pcalc = new FAR CCalc()) == NULL)

return NULL;

pcalc->AddRef();

parith = &(pcalc->m_arith);

// Build a TypeInfo for the functionality on this object that

// is being exposing for external programmability.

hresult = CreateDispTypeInfo(

&g_idataCCalc, LOCALE_SYSTEM_DEFAULT, &ptinfo);

if(hresult != NOERROR)

goto LError0;

// Create an aggregate with an instance of the default

// implementation of IDispatch that is initialized with our

// TypeInfo.

hresult = CreateStdDispatch(

pcalc, // controlling unknown

parith, // instance to dispatch on

ptinfo, // typeinfo describing the instance

&punkStdDisp);

ptinfo->Release();

if(hresult != NOERROR)

goto LError0;

pcalc->m_punkStdDisp = punkStdDisp;

return pcalc;

LError0:;

pcalc->Release();

return NULL;

}

Last news from Greatis Software

    Nostalgia .Net     .Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More »

Recommended software for developers

    Ultimate Pack     Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More »

    Form Designer .Net     Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More »

    Print Suite .Net     Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More »

    Gradient Controls .Net     Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More »

    Greatis iGrid     iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More »

All the contacts and projects

Dmitry Vasiliev (just.dmitry)

More Online Helps

Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages

greatis just4fun network