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   | // main.cpp
 
#include <windows.h>
#include <string>
 
using namespace std;
 
string GetDataKeyString(HKEY rootKey, wstring regSubKey, wstring regValueKey)
{
/*
LONG WINAPI RegCreateKeyEx(
  _In_        HKEY hKey,
  _In_        LPCTSTR lpSubKey,
  _Reserved_  DWORD Reserved,
  _In_opt_    LPTSTR lpClass,
  _In_        DWORD dwOptions,
  _In_        REGSAM samDesired,
  _In_opt_    LPSECURITY_ATTRIBUTES lpSecurityAttributes,
  _Out_       PHKEY phkResult,
  _Out_opt_   LPDWORD lpdwDisposition
);
 
LONG RegQueryValueEx( 
  HKEY hKey, 
  LPCWSTR lpValueName, 
  LPDWORD lpReserved, 
  LPDWORD lpType, 
  LPBYTE lpData, 
  LPDWORD lpcbData 
); 
*/
 
 
  LONG lResult;
  TCHAR regDataKey[MAX_PATH];
  DWORD regDataKeyLength = sizeof(regDataKey);
 
 
  //Creation du handle
    HKEY hKey;
    if (RegOpenKeyEx( 
	                  rootKey, 
	                  regSubKey.c_str(), 
	                  0, 
		       KEY_ALL_ACCESS, 
                      	       &hKey) == ERROR_SUCCESS)
 
   {
	    cout << "Key found" << endl;
 
         //Contrôle
        //_tprintf( TEXT("\ RegOpenKeyEx  OPENED"));
 
		lResult = RegQueryValueEx(
			            hKey, 
				regValueKey.c_str(),
				NULL, 
				NULL, 
                                             (LPBYTE)®DataKey, 
                                             ®DataKeyLength); 
 
		if (lResult == ERROR_SUCCESS)
 
		{
 
		       cout << "Value found" << endl;
  	                  //_tprintf(TEXT("Data : %s\n"), regDataKey);
 
                             std::string s( reinterpret_cast<char const*>(regDataKey), regDataKeyLength) ;
	    return s;
 
 
		}
		else
		{
		    cout << "Value not found" << endl;
		}   
 
        RegCloseKey( hKey);
    }	
	else
	{
	   cout << "Key not found" << endl;
	}
 
}	  
 
int main()
{
 
	string s;
	s = GetDataKeyString(HKEY_CURRENT_USER,L"SOFTWARE\\0000\\", L"Essai");
	cout << "String Data : " + s << endl;
	system("PAUSE");
 
 
   return 0;
} | 
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