インストールされているプロバイダーの列挙
次の例は、証明書登録 API を使用して、コンピューターにインストールされているプロバイダーを列挙する方法を示しています。
// enumeratinginstalledproviders.cpp : Defines the entry point for the console application.
//
/////////////////////////////////////////////////////////////////////
// EnumProviders.cpp
// Enumerate the cryptographic providers installed on the
// computer. This sample enumerates the Cryptography API
// (CryptoAPI) and Cryptography API: Next Generation (CNG)
// providers.
#include <certenroll.h>
#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
#include <atlbase.h>
// Forward declaration.
HRESULT enumProviders(void);
int _tmain(int argc, _TCHAR* argv[])
{
UNREFERENCED_PARAMETER(argc);
UNREFERENCED_PARAMETER(argv);
HRESULT hr = S_OK;
// Initialize COM.
hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
if(FAILED(hr)) return hr;
// Enumerate the CryptoAPI and CNG providers.
hr = enumProviders();
CoUninitialize();
return hr;
}
HRESULT enumProviders(void)
{
CComPtr<ICspInformations> pCSPs; // Provider collection
CComPtr<ICspInformation> pCSP; // Provider instgance
HRESULT hr = S_OK; // Return value
long lCount = 0; // Count of providers
CComBSTR bstrName; // Provider name
VARIANT_BOOL bLegacy; // CryptoAPI or CNG
// Create a collection of cryptographic providers.
hr = CoCreateInstance(
__uuidof(CCspInformations),
NULL,
CLSCTX_INPROC_SERVER,
__uuidof(ICspInformations),
(void **) &pCSPs);
if(FAILED(hr)) return hr;
// Add the providers installed on the computer.
hr = pCSPs->AddAvailableCsps();
if(FAILED(hr)) return hr;
// Retrieve the number of installed providers.
hr = pCSPs->get_Count(&lCount);
if(FAILED(hr)) return hr;
// Print the providers to the console. Print the
// name and a value that specifies whether the
// CSP is a legacy or CNG provider.
for (long i=0; i<lCount; i++)
{
hr = pCSPs->get_ItemByIndex(i, &pCSP);
if(FAILED(hr)) return hr;
hr = pCSP->get_Name(&bstrName);
if(FAILED(hr)) return hr;
hr = pCSP->get_LegacyCsp(&bLegacy);
if(FAILED(hr)) return hr;
if(VARIANT_TRUE == bLegacy)
wprintf_s(L"%2d. Legacy: ", i);
else
wprintf_s(L"%2d. CNG: ", i);
wprintf_s(L"%s\n", static_cast<wchar_t*>(bstrName.m_str));
pCSP=NULL;
}
printf_s("\n\nHit any key to continue: ");
_getch();
return hr;
}
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