C Developer - ScreenBuddy DLL Conversion

Freelance C Developer – Convert ScreenBuddy.exe into a DLL Library

Project Overview
We already have a fully functional C-based remote-control tool (ScreenBuddy on GitHub https://github.com/mmozeiko/ScreenBuddy). Your mission is not to build capture or encoding logic from scratch, but simply to refactor the existing EXE into a native Windows DLL that can be loaded from C++, Delphi, or C#.

Key Responsibilities

Library API: Expose these five exports in the DLL:

StartCapture(void (*callback)(EncodedFrame*))

StopCapture()

Capture(ScreenData* outFrame)

Encode(const ScreenData* inFrame, EncodedFrame* outData)

Decode(const EncodedFrame* inData, ScreenData* outFrame)

Internal Loop: Inside StartCapture, continuously perform Capture → Encode → callback until StopCapture is called.

Data Structures: Use simple ScreenData and EncodedFrame structs to pass raw frame buffers (RGB/NV12) and H.264 bitstreams.

Build System: Provide a one-click build.cmd or CMake setup targeting MSVC x64.

Technical Stack

Existing Codebase: C, Win32 API, D3D11 (wcap), HLSL, Media Foundation H.264 MFTs, DerpNet & WinHTTP JSON (all already implemented)

Output: Native Windows DLL (__declspec(dllexport)), C headers for P/Invoke in C++, Delphi, C#

Deliverables

Refactored DLL source code and headers

build.cmd and CMakeLists.txt for MSVC x64

Three minimal sample projects (C++, Delphi, C#) demonstrating each API call

Updated README with instructions and GitHub link

Requirements

Proven experience converting standalone Win32 EXEs into DLLs

Strong knowledge of native Windows C development and DLL exports