IDWriteLocalizedStrings::FindLocaleName method (dwrite.h)

Gets the zero-based index of the locale name/string pair with the specified locale name.

Syntax

HRESULT FindLocaleName(
  [in]  WCHAR const *localeName,
  [out] UINT32      *index,
  [out] BOOL        *exists
);

Parameters

[in] localeName

Type: const WCHAR*

A null-terminated array of characters containing the locale name to look for.

[out] index

Type: UINT32*

The zero-based index of the locale name/string pair. This method initializes index to UINT_MAX.

[out] exists

Type: BOOL*

When this method returns, contains TRUE if the locale name exists; otherwise, FALSE. This method initializes exists to FALSE.

Return value

Type: HRESULT

If the specified locale name does not exist, the return value is S_OK, but index is UINT_MAX and exists is FALSE.

Remarks

Note that if the locale name does not exist, the return value is a success and the exists parameter is FALSE. If you are getting the font family name for a font and the specified locale name does not exist, one option is to set the index to 0 as shown below. There is always at least one locale for a font family.

UINT32 index = 0;
BOOL exists = false;

wchar_t localeName[LOCALE_NAME_MAX_LENGTH];

if (SUCCEEDED(hr))
{
    // Get the default locale for this user.
    int defaultLocaleSuccess = GetUserDefaultLocaleName(localeName, LOCALE_NAME_MAX_LENGTH);

    // If the default locale is returned, find that locale name, otherwise use "en-us".
    if (defaultLocaleSuccess)
    {
        hr = pFamilyNames->FindLocaleName(localeName, &index, &exists);
    }
    if (SUCCEEDED(hr) && !exists) // if the above find did not find a match, retry with US English
    {
        hr = pFamilyNames->FindLocaleName(L"en-us", &index, &exists);
    }
}

// If the specified locale doesn't exist, select the first on the list.
if (!exists)
    index = 0;

Requirements

See also

IDWriteLocalizedStrings