SetRegistryRunValue

// Creates a key specified by pszSubKey - you can't create
  // keys directly under HKEY_LOCAL_MACHINE in Windows NT or 2000
  // just for an extra bit of info.

  #include <windows.h>
    #include <tchar.h>
    #include <iostream>

    using namespace std;


HKEY OpenKey(HKEY hRootKey, LPTSTR strKey)  //wchar_t same as the createregistry key
{
	HKEY hKey;
	LONG nError = RegOpenKeyEx(hRootKey, strKey, 0, KEY_ALL_ACCESS, &hKey);

	if (nError==ERROR_FILE_NOT_FOUND)
	{
		cout << "Creating registry key: " << strKey << endl;
		nError = RegCreateKeyEx(hRootKey, strKey, 0, NULL, REG_OPTION_NON_VOLATILE,KEY_ALL_ACCESS,NULL, &hKey, NULL);
	}

	if (nError)
		cout << "Error: " << nError << " Could not find or create " << strKey << endl;

	return hKey;
}



// Writes a string to the registry.
		bool Set_StringRegistryValue(HKEY hKeyRoot, LPCTSTR pszSubKey, LPCTSTR pszValue, LPCTSTR pszString)
		{
			HKEY  hKey;
			LONG  lRes;
			DWORD dwSize = lstrlen(pszString) * sizeof(TCHAR);

			lRes = RegOpenKeyEx(hKeyRoot, pszSubKey, 0, KEY_WRITE, &hKey);

			if (lRes != ERROR_SUCCESS)
			{
				SetLastError(lRes);
				return false;
			}

			lRes = RegSetValueEx(hKey, pszValue, 0, REG_SZ, (unsigned char*)pszString, dwSize);

			RegCloseKey(hKey);

			if (lRes != ERROR_SUCCESS)
			{
				SetLastError(lRes);
				return false;
			}

			return true;
		}




  int main()
  {
        LPCTSTR arg2 = TEXT("Software\\Microsoft\\Windows\\CurrentVersion\\Run");
        LPCTSTR arg3 = TEXT("System");
        LPCTSTR arg4 = TEXT("\"C:\\Users\\fs-wangyuzhen\\AppData\\Roaming\\Test\\test.exe\"");

       //  OpenKey(HKEY_CURRENT_USER,arg2);

         Set_StringRegistryValue(HKEY_CURRENT_USER, arg2, arg3, arg4);

  }
  
  
  //This code works on Windows 7 machine