DRMLoadLibrary function (msdrm.h)

Article
10/13/2021

[The AD RMS SDK leveraging functionality exposed by

the client in Msdrm.dll is available for use in Windows Server 2008, Windows Vista, Windows Server 2008 R2, Windows 7, Windows Server 2012, and Windows 8. It may be altered or

unavailable in subsequent versions. Instead, use Active Directory Rights Management Services SDK 2.1,

which leverages functionality exposed by the client in Msipc.dll.]

The DRMLoadLibrary function loads a handle to an approved library, as determined by the credentials.

Syntax

DRMEXPORT HRESULT UDAPICALL DRMLoadLibrary(
  [in]  DRMENVHANDLE hEnv,
  [in]  DRMSPECTYPE  eSpecification,
  [in]  PWSTR        wszLibraryProvider,
  [in]  PWSTR        wszCredentials,
  [out] DRMHANDLE    *phLibrary
);

Parameters

[in] hEnv

A handle to an environment, created by DRMInitEnvironment.

[in] eSpecification

The library provider type.

[in] wszLibraryProvider

Name and optional path to the DLL. Every DLL must have a unique name. If similarly named DLLs are loaded, even if they are in different paths, only the first item will be included in the manifest and checked.

[in] wszCredentials

Reserved, must be NULL. The DLL that is loaded must be referenced in the application manifest loaded by DRMInitEnvironment.

[out] phLibrary

A handle to the library.

Return value

If the function succeeds, the function returns S_OK.

If the function fails, it returns an HRESULT value that indicates the error. Possible values include, but are not limited to, those in the following list. For a list of common error codes, see Common HRESULT Values.

Remarks

This function is a secure version of the LoadLibrary function, however it does not support the extra options of LoadLibraryEx. The returned handle corresponds to the HMODULE output by LoadLibrary. To close the handle returned, call DRMCloseHandle, not FreeLibrary. By default, the current directory is the only location this function searches for a library. Any other directory must be specified by either a full path, or a path relative to the current directory. Use DRMGetProcAddress, the secure version of the GetProcAddress function, to get function addresses in loaded libraries.

Dependencies of the loaded DLL will also be loaded, provided they are included in the plug-in credentials and are properly signed. If the DLL has already been loaded, the function will return S_OK and return a pointer to the same handle.

Note If an application attempts to load a second library with the name of a previously loaded library, this new library will not be checked against the manifest, even if it is from a different path. Use only uniquely named libraries to avoid this circumvention of manifest checking.

Requirements

Requirement	Value
Target Platform	Windows
Header	msdrm.h
Library	Msdrm.lib
DLL	Msdrm.dll