To Load a System Profile
To make changes to a system profile, you must load it into a profile object. The profile manager provides two options for loading system profiles: by identifier, and by index.
A system profile identifier is a GUID value assigned to the system profile when it was created. For a list of the GUID constants associated with the version 8 system profiles, see System Profiles. You can find the GUID constants for previous versions in the header file WMSysPrf.h. For more information about this and other header files included with the Windows Media Format SDK, see Library Files and Compiler Settings.
The following example code demonstrates how to load a system profile using the system profile identifier. For this code to work, you must include WMSysPrf.h and stdio.h. For more information about using this code, see Using the Code Examples.
IWMProfileManager* pProfileMgr = NULL; IWMProfile* pProfile = NULL; HRESULT hr = S_OK; // Initialize COM. hr = CoInitialize(NULL); // Create a profile manager. hr = WMCreateProfileManager(&pProfileMgr); // Retrieve the data for the general-purpose broadband video profile. hr = pProfileMgr->LoadProfileByID(WMProfile_V80_100Video, &pProfile); // TODO: Perform whatever customizations are needed. For details about // editing profiles, see Using Custom Profiles. // Clean up. pProfile->Release(); pProfile = NULL; pProfileMgr->Release(); pProfileMgr = NULL;
If you do not know which profile you want to use, you can iterate through all of the system profiles of a particular version using the GetSystemProfileCount and LoadSystemProfile methods of the IWMProfileManager interface. These methods only deal with one version of the system profiles at a time. For more information about changing the system profile version, see To Change System Profile Versions.