public static ServiceConfig GetServiceConfig(SafeHandle serviceHandle)
{
// Stores the buffer size
//
uint bufferSize;
// Call the native method once to attempt to get the needed buffer size
//
NativeMethods.QueryServiceConfig(serviceHandle, IntPtr.Zero, 0, out bufferSize);
// Verify the last error was ERROR_INSUFFICIENT_BUFFER, if not, throw an exception
//
if (Marshal.GetLastWin32Error() != Win32Error.ERROR_INSUFFICIENT_BUFFER)
{
throw new Win32Exception();
}
// Allocate a buffer that is the necessary size
//
var serviceConfigPtr = Marshal.AllocHGlobal((int)bufferSize);
try
{
// Call the native method again which should fill the buffer with the struct and throw an exception if that fails
//
if (!NativeMethods.QueryServiceConfig(serviceHandle, serviceConfigPtr, bufferSize, out bufferSize))
{
throw new Win32Exception();
}
// Marshal the pointer to a struct and return a new ServiceConfig object
//
return
(new ServiceConfig(
(QUERY_SERVICE_CONFIG)Marshal.PtrToStructure(serviceConfigPtr, typeof(QUERY_SERVICE_CONFIG))));
}
finally
{
// Free the buffer
//
Marshal.FreeHGlobal(serviceConfigPtr);
}
}
