建立 GUID 可系結字串表示法的範例程式代碼

下列程式代碼範例可用來傳回 GUID 的字串表示法，可用來繫結至物件。

//*******************************************************************
//
//  GUIDtoBindableString()
//
//  Converts a GUID into a string that can be used for binding with  
//  the <GUID= or <WKGUID= syntax. The caller must free the allocated  
//  string with the FreeADsStr when it is no longer required.
//
//*******************************************************************

HRESULT GUIDtoBindableString(LPGUID pGUID, LPWSTR *ppGUIDString)
{
    if((!pGUID) || (ppGUIDString==NULL))
    {
        return E_INVALIDARG;
    }

    // Build bindable GUID string.
    DWORD dwBytes =  sizeof(GUID);
    WCHAR szByte[3];
    LPWSTR pwszGUID = new WCHAR[(dwBytes * 2) + 1];
    if(NULL == pwszGUID)
    {
        return E_OUTOFMEMORY;
    }

    *pwszGUID = NULL;

    HRESULT hr = S_OK;
    LPBYTE lpByte;
    DWORD dwItem;

    // Loop through to add each byte to the string.
    for(dwItem = 0, 
        lpByte = (LPBYTE)pGUID; dwItem < dwBytes; 
        dwItem++)
    {
        // Append to pwszGUID, double-byte, byte at dwItem index.
        swprintf_s(szByte, L"%02x", lpByte[dwItem]);
        wcscat_s(pwszGuid, szByte);
    }
    
    // Allocate memory for the string.
    *ppGUIDString = AllocADsStr(pwszGUID);

    delete [] pwszGUID;
    
    if(NULL != *ppGUIDString)
    {
        hr = S_OK;
    }
    else
    {
        hr = E_OUTOFMEMORY;
    }

    
    // Caller must free ppGUIDString using FreeADsStr.
    return hr;
}