/// <summary>
/// Applies content of <paramref name="pathToManifest"/> file to current context, invokes <paramref name="thingToDo"/> delegate, deactivates applied context.
/// </summary>
/// <param name="pathToManifest"></param>
/// <param name="thingToDo"></param>
/// <exception cref="FileNotFoundException"></exception>
public static void UsingManifestDo(string pathToManifest, doSomething thingToDo)
{
var context = new ACTCTX();
context.cbSize = Marshal.SizeOf(typeof(ACTCTX));
bool wrongContextStructure = (context.cbSize != 0x20 && IntPtr.Size == 4) // ensure stucture is right on 32 bits
|| (context.cbSize != 52 && IntPtr.Size == 8); // the same for 64 bits
if (wrongContextStructure)
{
throw new Exception("ACTCTX.cbSize is wrong");
}
context.lpSource = pathToManifest;
IntPtr hActCtx = NativeMethods.CreateActCtx(ref context);
if (hActCtx == Constants.INVALID_HANDLE_VALUE)
{
var error = Marshal.GetLastWin32Error();
if (error == SYSTEM_ERROR_CODES.ERROR_FILE_NOT_FOUND)
{
throw new System.IO.FileNotFoundException("Failed to find manifest", pathToManifest);
}
throw new Win32Exception(error);
}
try // with valid hActCtx
{
IntPtr cookie = IntPtr.Zero;
if (!NativeMethods.ActivateActCtx(hActCtx, out cookie))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
try // with activated context
{
thingToDo();
}
finally
{
NativeMethods.DeactivateActCtx(0, cookie);
}
}
finally
{
NativeMethods.ReleaseActCtx(hActCtx);
}
}
internal extern static IntPtr CreateActCtx(ref ACTCTX actctx);
internal static extern IntPtr CreateActCtx(ref ACTCTX actctx);
