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MovieMakerPreviewClient.dll

Sourcesrc/MovieMakerPreviewClient/
CMake targetMovieMakerPreviewClient
TypeWin32 COM DLL (28 KB / 5.9 KB code in the original)
FamilyApplication targets

At a glance​

Provides the preview window communication interface used by the main application to interact with an embedded preview pane. The public header (MovieMakerPreviewClient.h) documents its scope:

  • Preview window creation and lifecycle
  • Frame rendering requests (seek + render a single frame)
  • Transport control (play / pause / stop / seek)
  • Resize and aspect-ratio handling
  • Snapshot capture from the preview surface

Public surface​

The standard COM quartet:

DllCanUnloadNow     DllGetClassObject
DllRegisterServer   DllUnregisterServer

Implementation notes​

  • The client renders via GDI+ (unlike the D3D11 in-process preview presenter — this DLL serves the simpler embedded-pane contract).
  • Built with the same header conventions as the original (STRICT, WIN32_LEAN_AND_MEAN, NOMINMAX guards; WINVER 0x0602).
  • GDI+ drawing notes: Gdiplus::Graphics::DrawImage takes Gdiplus::Image*, not const Bitmap* (Gotcha #21 in ROADMAP.md).

Testing​

  • Contract coverage in tests/mmr-python (COM activation + transport semantics).
  • tests/MovieMakerPreviewClient/ — per-module C++ test directory.

Analysis artifacts​

analysis/MovieMakerPreviewClient/ (PDB GUID {ABE6F6C4-02E6-47EA-B7FF-6A44A32264DD}).