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Saving Profiles

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[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

You can use the IWMProfileManager::SaveProfile method to save the contents of a profile object to a string formatted with XML. No methods are provided to store the profile string to a file; you can use the file I/O routines of your choice.

Note

You should never alter the profile string written to a file. Any changes you want to make to a profile should be made programmatically. Changing values in a .prx file can cause unpredictable results.

 

The following example is a function to save a profile to a file using standard C-style file I/O. To compile an application that uses this example, you must include stdio.h in your project.

HRESULT ProfileToFile(IWMProfileManager* pProfileMgr, 
                      IWMProfile* pProfile)
{
    HRESULT hr = S_OK;

    FILE*   pFile;
    
    WCHAR*  pwszProfileString = NULL;
    DWORD   cchProfileString = 0;

    // Save the profile to a string.
    // First, retrieve the size of the string required.
    hr = pProfileMgr->SaveProfile(pProfile, 
                                  NULL, 
                                  &cchProfileString);
    if(FAILED(hr))
    {
        printf("Could not get the profile string size.");
        return hr;
    }

    // Allocate memory to hold the string.
    pwszProfileString = new WCHAR[cchProfileString];

    if(pwszProfileString == NULL)
    {
        printf("Could not allocate memory for the profile string.");
        return E_OUTOFMEMORY;
    }

    // Retrieve the string.
    hr = pProfileMgr->SaveProfile(pProfile, 
                                  pwszProfileString, 
                                  &cchProfileString);
    if(FAILED(hr))
    {
        printf("Could not save the profile string.");
        return hr;
    }

    // Create the output file.
    pFile = fopen("MyProfile.prx", "w");

    // Write the profile string to the file.
    fprintf(pFile, "%S\n", pwszProfileString);

    // Close the file.
    fclose(pFile);

    delete[] pwszProfileString;

    return S_OK;
}

Working with Profiles