IMFAudioPolicy::SetIconPath method (mfidl.h)

Article
02/22/2024

Sets the icon resource for the audio session. The Windows volume control displays this icon.

Syntax

HRESULT SetIconPath(
  [in] LPCWSTR pszPath
);

Parameters

[in] pszPath

A wide-character string that specifies the icon. See Remarks.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

The icon path has the format "path,index" or "path,-id", where path is the fully qualified path to a DLL, executable file, or icon file; index is the zero-based index of the icon within the file; and id is a resource identifier. Note that resource identifiers are preceded by a minus sign (-) to distinguish them from indexes. The path can contain environment variables, such as "%windir%". For more information, see IAudioSessionControl::SetIconPath in the Windows SDK.

Examples

The following example sets the icon using a resource identifier for an icon in the application's executable file.

HRESULT SetIcon(IMFMediaSession *pSession, int nID)
{
    IMFAudioPolicy *pPolicy = NULL;

    const DWORD CCH_ICON_PATH = MAX_PATH + 16;
    WCHAR szFileName[MAX_PATH];
    WCHAR szIconPath[CCH_ICON_PATH];

    HRESULT hr = S_OK;

    DWORD result = GetModuleFileNameW(NULL, szFileName, MAX_PATH);

    // Note: GetModuleFileName can return a truncated string without a 
    // NULL terminator. If so, the function succeeds but sets the last 
    // error to ERROR_INSUFFICIENT_BUFFER.
    if ((result == 0) || (GetLastError() ==  ERROR_INSUFFICIENT_BUFFER))
    {
        hr = E_FAIL;
        goto done;
    }

    hr = StringCchPrintfW(szIconPath, CCH_ICON_PATH, 
                 L"%s,-%d", szFileName, nID);

    if (FAILED(hr))
    {
        goto done;
    }

    hr = MFGetService(
        pSession, 
        MR_AUDIO_POLICY_SERVICE, 
        IID_PPV_ARGS(&pPolicy)
        );

    if (FAILED(hr))
    {
        goto done;
    }

    hr = pPolicy->SetIconPath(szIconPath);
    if (FAILED(hr))
    {
        goto done;
    }

done:
    SafeRelease(&pPolicy);
    return hr;
}

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	mfidl.h
Library	Mfuuid.lib

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