RE: Convert LCID to _locale_t

From:
=?Utf-8?B?Q29kZXIgR3V5?= <CoderGuy@discussions.microsoft.com>
Newsgroups:
microsoft.public.vc.language
Date:
Tue, 13 Mar 2007 21:45:08 -0700
Message-ID:
<B9892D39-1AF0-483A-915D-A6D65EB12434@microsoft.com>

I have an LCID and am looking to call _vscwprintf_l with that particular
locale. Is there any way of converting an LCID to a _locale_t?


I haven't been able to find a function which does what I want, so I think I
successfully built my own. Though I've tested with various LCIDs, please
reply if you see any problems...

HRESULT LcidToCrtLocale(
    int nCategory,
    LCID lcidLocale,
    _locale_t * ptLocale)
{
    DWORD dwCchSize;
    DWORD dwCchLanguageSize;
    DWORD dwCchCountrySize;
    LPSTR pszLanguageCountryName = NULL;

    // Validate parameters
    HRESULT hr = (ptLocale == NULL) ? E_POINTER : S_OK;

    // Get the language buffer size
    if (SUCCEEDED(hr))
    {
        dwCchLanguageSize = GetLocaleInfoA(
            lcidLocale,
            LOCALE_SENGLANGUAGE,
            NULL,
            0);

        if (dwCchLanguageSize == 0)
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    // Get the country buffer size
    if (SUCCEEDED(hr))
    {
        dwCchCountrySize = GetLocaleInfoA(
            lcidLocale,
            LOCALE_SENGCOUNTRY,
            NULL,
            0);

        if (dwCchCountrySize == 0)
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    // Allocate a buffer for the full name
    if (SUCCEEDED(hr))
    {
        pszLanguageCountryName = (LPSTR)HeapAlloc(
            GetProcessHeap(),
            0,
            (dwCchLanguageSize + dwCchCountrySize) * sizeof(CHAR));

        if (pszLanguageCountryName == NULL)
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    // Copy the language name
    if (SUCCEEDED(hr))
    {
        dwCchSize = GetLocaleInfoA(
            lcidLocale,
            LOCALE_SENGLANGUAGE,
            pszLanguageCountryName,
            dwCchLanguageSize);

        if (dwCchLanguageSize != dwCchSize)
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    // Add the underscore separator
    if (SUCCEEDED(hr))
    {
        pszLanguageCountryName[dwCchLanguageSize - 1] = '_';
    }

    // Copy the country name
    if (SUCCEEDED(hr))
    {
        dwCchSize = GetLocaleInfoA(
            lcidLocale,
            LOCALE_SENGCOUNTRY,
            pszLanguageCountryName + dwCchLanguageSize,
            dwCchCountrySize);

        if (dwCchCountrySize != dwCchSize)
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    // Create the locale
    if (SUCCEEDED(hr))
    {
        *ptLocale = _create_locale(nCategory, pszLanguageCountryName);

        if (*ptLocale == NULL)
        {
            hr = E_FAIL;
        }
    }

    // Cleanup
    if (pszLanguageCountryName != NULL)
    {
        HeapFree(GetProcessHeap(), 0, pszLanguageCountryName);
        pszLanguageCountryName = NULL;
    }

    return hr;
}

Usage:

_locale_t tLocale;
HRESULT hr = LcidToCrtLocale(LC_NUMERIC, lcidLocale, &tLocale);
...._vscwprintf_l...
_free_locale(tLocale);

Cheers

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