当我尝试为所有磁贴（包括其他用户磁贴）启用自定义凭据提供程序时，我做了一些更改GetCredentialCount()方法和_EnumerateCredentials()Microsoft 提供的凭据提供程序示例中的 SampleProvider.cpp 文件中的方法。我所做的改变是：
HRESULT CServiceProvider::GetCredentialCount(
_Out_ DWORD *pdwCount,
_Out_ DWORD *pdwDefault,
_Out_ BOOL *pbAutoLogonWithDefault){
*pdwDefault = CREDENTIAL_PROVIDER_NO_DEFAULT;
*pbAutoLogonWithDefault = FALSE;
if (_fRecreateEnumeratedCredentials)
{
_fRecreateEnumeratedCredentials = false;
_ReleaseEnumeratedCredentials();
_CreateEnumeratedCredentials();
}
DWORD dwUserCount;
HRESULT hr;
if (_pCredProviderUserArray != nullptr) {
hr = _pCredProviderUserArray->GetCount(&dwUserCount);
}
if ((dwUserCount == 0) || (IsOS(OS_DOMAINMEMBER) == 1)) {
dwUserCount += 1;//display additional empty tile
}
*pdwCount = dwUserCount;
return S_OK;}
HRESULT CServiceProvider::_EnumerateCredentials(){
HRESULT hr = E_UNEXPECTED;
DWORD dwUserCount;
if (_pCredProviderUserArray != nullptr)
{
_pCredProviderUserArray->GetCount(&dwUserCount);
if (dwUserCount > 0)
{
//You need to initialize all the fields in LogonUI for each and every user
for (DWORD i = 0; i < dwUserCount; i++) {
ICredentialProviderUser* pCredUser;
hr = _pCredProviderUserArray->GetAt(i, &pCredUser);
if (SUCCEEDED(hr))
{
_pCredential.push_back(new(std::nothrow) CUserCredential());
if (_pCredential[i] != nullptr)
{
hr = _pCredential[i]->Initialize(_cpus, s_rgCredProvFieldDescriptors, s_rgFieldStatePairs, pCredUser);
if (FAILED(hr))
{
_pCredential[i]->Release();
_pCredential[i] = nullptr;
}
}
else
{
hr = E_OUTOFMEMORY;
}
pCredUser->Release();
}
}
}
//if you are in a domain or have no users on the list you have to show "Other user tile"
if ((dwUserCount == 0) || (IsOS(OS_DOMAINMEMBER) == 1)) {
_pCredential.push_back(new(std::nothrow) CUserCredential());
if (_pCredential[_pCredential.size() - 1] != nullptr) {
hr = _pCredential[_pCredential.size() - 1]->Initialize(_cpus, s_rgCredProvFieldDescriptors, s_rgFieldStatePairs, nullptr);
}
}
return hr;
}
return hr;
}
现在如你所见，我们正在发送nullptr作为调用时的参数之一Initialize()检查系统是否连接到域后的方法，我们需要处理它nullptr in Initialize()方法通过检查 SampleCredential.cpp 文件中的 if 条件。
HRESULT CUserCredential::Initialize(CREDENTIAL_PROVIDER_USAGE_SCENARIO cpus,
_In_ CREDENTIAL_PROVIDER_FIELD_DESCRIPTOR const* rgcpfd,
_In_ FIELD_STATE_PAIR const* rgfsp,
_In_ ICredentialProviderUser* pcpUser){
HRESULT hr = S_OK;
_cpus = cpus;
_nNextScreenID = e_ARSNone;
GUID guidProvider;
LPOLESTR clsid;
if (pcpUser != nullptr) {
pcpUser->GetProviderID(&guidProvider);
StringFromCLSID(guidProvider, &clsid);
CoTaskMemFree(clsid);
_fIsLocalUser = (guidProvider == Identity_LocalUserProvider);
}
else {
_fIsLocalUser = true;//CP V1 or Domain
}
// Copy the field descriptors for each field. This is useful if you want to vary the field
// descriptors based on what Usage scenario the credential was created for.
for (DWORD i = 0; SUCCEEDED(hr) && i < ARRAYSIZE(_rgCredProvFieldDescriptors); i++)
{
_rgFieldStatePairs[i] = rgfsp[i];
hr = FieldDescriptorCopy(rgcpfd[i], &_rgCredProvFieldDescriptors[i]);
}
// Initialize the String value of all the fields.
if (SUCCEEDED(hr))
{
hr = SHStrDupW(L"SomeLable1", &_rgFieldStrings[SFI_LABEL]);
}
if (SUCCEEDED(hr))
{
hr = SHStrDupW(L"SomeLable2", &_rgFieldStrings[SFI_LARGE_TEXT]);
}
if (SUCCEEDED(hr))
{
hr = SHStrDupW(L"", &_rgFieldStrings[SFI_PASSWORD]);
}
if (SUCCEEDED(hr))
{
hr = SHStrDupW(L"Somelabel4", &_rgFieldStrings[SFI_SUBMIT_BUTTON]);
}
hr = S_OK;
if (SUCCEEDED(hr))
{
if (pcpUser != nullptr) {
hr = pcpUser->GetStringValue(PKEY_Identity_QualifiedUserName, &_pszQualifiedUserName);//get username from the LogonUI user object
PWSTR pszUserName1;
pcpUser->GetStringValue(PKEY_Identity_UserName, &pszUserName1);
if (_fIsLocalUser) {
PWSTR pszUserName;
pcpUser->GetStringValue(PKEY_Identity_UserName, &pszUserName);
if (pszUserName != nullptr)
{
wchar_t szString[256];
StringCchPrintf(szString, ARRAYSIZE(szString), L"User Name: %s", pszUserName);
if (DEVELOPING) PrintLn(szString);
hr = SHStrDupW(pszUserName, &_rgFieldStrings[SFI_LARGE_TEXT]);
CoTaskMemFree(pszUserName);
}
else
{
hr = SHStrDupW(L"User Name is NULL", &_rgFieldStrings[SFI_LARGE_TEXT]);
}
}
else {
if (DEVELOPING) PrintLn(L"Domain user, skip SFI_LARGE_TEXT");
}
}
else {
PWSTR connectedDomainName = getNetworkName();
wchar_t szString[256];
StringCchPrintf(szString, ARRAYSIZE(szString), L"Sign in to: %s", connectedDomainName);
hr = SHStrDupW(szString, &_rgFieldStrings[SFI_DOMAIN_NAME_TEXT]);
if (DEVELOPING) PrintLn("Unknown user -> display LoginName");
hr = SHStrDupW(L"", &_pszQualifiedUserName);
_fUserNameVisible = true;
_rgFieldStatePairs[SFI_LOGIN_NAME].cpfs = CPFS_DISPLAY_IN_SELECTED_TILE;//unhide login name
//switch focus to login
_rgFieldStatePairs[SFI_LOGIN_NAME].cpfis = CPFIS_FOCUSED;
_rgFieldStatePairs[SFI_PASSWORD].cpfis = CPFIS_NONE;
//Don't panic!!!
}
}
if (pcpUser != nullptr)
{
hr = pcpUser->GetSid(&_pszUserSid);
}
return hr;}
使用上面的代码，您可以解决闪烁（这是 CP 崩溃）的问题，并为所有用户图块启用凭据提供程序。
