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CLSIDFromProgIDEx function (combaseapi.h)

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Triggers automatic installation if the COMClassStore policy is enabled.

This is analogous to the behavior of CoCreateInstance when neither CLSCTX_ENABLE_CODE_DOWNLOAD nor CLSCTX_NO_CODE_DOWNLOAD are specified.

Syntax

HRESULT CLSIDFromProgIDEx(
  [in]  LPCOLESTR lpszProgID,
  [out] LPCLSID   lpclsid
);

Parameters

[in] lpszProgID

A pointer to the ProgID whose CLSID is requested.

[out] lpclsid

Receives a pointer to the retrieved CLSID on return.

Return value

This function can return the following values.

Return code Description
S_OK
 The CLSID was retrieved successfully.
CO_E_CLASSSTRING
 The registered CLSID for the ProgID is invalid.
REGDB_E_WRITEREGDB
 An error occurred writing the CLSID to the registry. See Remarks below.

Remarks

CLSCTX_ENABLE_CODE_DOWNLOAD enables automatic installation of missing classes through IntelliMirror/Application Management from the Active Directory. If this flag is not specified, the COMClassStore Policy ("Download missing COM components") determines the behavior (default: no download).

If the COMClassStore Policy enables automatic installation, CLSCTX_NO_CODE_DOWNLOAD can be used to explicitly disallow download for an activation.

If either of the following registry values are enabled (meaning set to 1), automatic download of missing classes is enabled:

  • HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\App Management\COMClassStore
  • HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\App Management \COMClassStore

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header combaseapi.h (include Objbase.h)
Library Ole32.lib
DLL Ole32.dll

See also

ProgIDFromCLSID