CLRCreateInstance Function (.NET Framework)

Article
2021-09-15

Provides one of three interfaces: ICLRMetaHost, ICLRMetaHostPolicy, or ICLRDebugging.

Syntax

HRESULT CLRCreateInstance(
    [in]  REFCLSID  clsid,
    [in]  REFIID     riid,
    [out] LPVOID  * ppInterface
);

Parameters

clsid
[in] One of three class identifiers: CLSID_CLRMetaHost, CLSID_CLRMetaHostPolicy, or CLSID_CLRDebugging.

riid
[in] One of three interface identifiers (IIDs): IID_ICLRMetaHost, IID_ICLRMetaHostPolicy, or IID_ICLRDebugging.

ppInterface
[out] One of three interfaces: ICLRMetaHost, ICLRMetaHostPolicy, or ICLRDebugging.

Return Value

This method returns the following specific HRESULTs as well as HRESULT errors that indicate method failure.

HRESULT	Description
S_OK	The method completed successfully.
E_POINTER	`ppInterface` is null.

Remarks

The following table shows the supported combinations for clsid and riid.

`clsid`	`riid`
CLSID_CLRMetaHost	IID_ICLRMetaHost
CLSID_CLRMetaHostPolicy	IID_ICLRMetaHostPolicy
CLSID_CLRDebugging	IID_ICLRDebugging

The following code shows how to use CLRCreateInstance to get all three interfaces:

#include <metahost.h>
#pragma comment(lib, "mscoree.lib")

ICLRMetaHost       *pMetaHost       = NULL;
ICLRMetaHostPolicy *pMetaHostPolicy = NULL;
ICLRDebugging      *pCLRDebugging   = NULL;
HRESULT hr;
hr = CLRCreateInstance(CLSID_CLRMetaHost, IID_ICLRMetaHost,
                    (LPVOID*)&pMetaHost);
hr = CLRCreateInstance (CLSID_CLRMetaHostPolicy, IID_ICLRMetaHostPolicy,
                    (LPVOID*)&pMetaHostPolicy);
hr = CLRCreateInstance (CLSID_CLRDebugging, IID_ICLRDebugging,
                    (LPVOID*)&pCLRDebugging);

The CreateInterface function is aliased to CLRCreateInstance. Both CLRCreateInstance and CreateInterface functions can be used interchangeably. For example:

HMODULE hModule = LoadLibrary(L"mscoree.dll");
CreateInterfaceFnPtr createInterface = (CreateInterfaceFnPtr)GetProcAddress(hModule, "CreateInterface");
HRESULT hr;
hr = createInterface(CLSID_CLRMetaHost, IID_ICLRMetaHost, (LPVOID*)&pMetaHost);
hr = createInterface (CLSID_CLRMetaHostPolicy, IID_ICLRMetaHostPolicy,  (LPVOID*)&pMetaHostPolicy);
hr = createInterface (CLSID_CLRDebugging, IID_ICLRDebugging,  (LPVOID*)&pCLRDebugging);

Requirements

Platforms: See System Requirements.

Header: MetaHost.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 4

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