This is the repository for Discord Messenger's modern Windows API shim. Its aim is to implement a shim for certain APIs that were implemented in versions earlier than Discord Messenger targets.

It performs its duty by:

• Using the actual procedures, when available, or

• Providing an (admittedly maybe crappy, but passable) implementation of the function, if Windows did not provide us with its own version.

To use, simply embed the src/*.cpp and include/ri/*.hpp files in your project. Then you will simply add ri:: to all uses of modern Windows APIs that are implemented by this project and call ri::InitReimplementation() before any of the code that uses it.

This is a list of functions shimmed, along with their implementation if Windows doesn't provide one. This list hasn't been updated in a while and is probably incomplete.

• GetFileSizeEx - Implemented using GetFileSize.

• SetFilePointerEx - Copied from https://github.com/enlyze/EnlyzeWinCompatLib/blob/master/src/winnt_40.cpp#L43

• VerSetConditionMask - Copied from ReactOS' implementation

• VerifyVersionInfo - Implemented using GetVersionEx.

• RegisterWaitForSingleObject - Returns INVALID_HANDLE_VALUE through phNewWaitObject and FALSE to the caller. Not implemented.

• UnregisterWaitEx - Not implemented, returns FALSE.

• GradientFill - Not implemented, returns FALSE.

• AlphaBlend - Not implemented, simply calls StretchBlt.

• TransparentBlt - Not implemented, simply calls StretchBlt.

• SHGetFolderPath - Not implemented, just returns ".".

• PathFileExists - Implemented using GetFileAttributes.

• GetMenuInfo - Not implemented, returns FALSE.

• SetMenuInfo - Not implemented, returns FALSE.

• GetGestureInfo - Not implemented, returns FALSE.

• SetDCBrushColor - Creates a new brush unless the color is the same. You must use ri::GetDCBrush() instead of GetStockObject() to get this brush. If SetDCBrushColor is imported, then ri::GetDCBrush() redirects to GetStockObject(DC_BRUSH).

• SetDCPenColor - Creates a new pen unless the color is the same. You must use ri::GetDCPen() instead of GetStockObject() to get this pen. If SetDCPenColor is imported, then ri::GetDCPen() redirects to GetStockObject(DC_PEN).

• MonitorFromPoint - Returns a fake magic value to be passed into GetMonitorInfo.

• GetMonitorInfo - Simulates fetching information about the primary monitor using GetSystemMetrics.

• AnimateWindow - Hides or shows the window based on the flags parameter. Animation related flags are ignored.

• InitializeCriticalSectionAndSpinCount - Initializes a critical section. Ignores the spin count.

• TryEnterCriticalSection - Not implemented, returns FALSE.

• GetVersionEx - Assumes a Windows 9X target (WIN32_WINDOWS) and szCSDVersion returns "Unknown Windows", but the major, minor, and build numbers are pulled from GetVersion().

• QueueUserAPC - Not implemented. Used by asio to wake up sleeping threads.

• SHGetFileInfo - Not implemented. Clears the hIcon member and returns 0.

• Shell_NotifyIcon - Not implemented. Returns 0.

• TrackMouseEvent - Not implemented. Returns 0.

• DrawEdge - Barely implemented. Draws a single solid black rectangle.

• DrawIconEx - Barely implemented. Simply calls DrawIcon on the icon with no regard to sizing.

• GetScrollInfo - Emulated using GetScrollPos and GetScrollRange to the best of its ability.

• SetScrollInfo - Emulated using SetScrollPos and SetScrollRange to the best of its ability.

• GetSysColorBrush - Uses GetSysColor and creates solid brushes on demand.

• LoadImage - Unimplemented. Returns NULL.

• CertOpenSystemStoreA - Unimplemented. Returns NULL.

• CertCloseStore - Unimplemented. Returns FALSE.

• CertFindCertificateInStore - Unimplemented. Returns NULL.

• CertFreeCertificateContext - Unimplemented. Returns FALSE.

• CertEnumCertificatesInStore - Unimplemented. Returns NULL.

• CoInitialize - Unimplemented. Returns 0.

This project is licensed under the MIT license. See the license file for details.