Declared schemas

• WNDPROC: window-procedure callback schema with HWND, one message ordinal, wParam, and lParam parameters and Intx result.
• HBRUSH, HICON, HMENU, HMONITOR, and HWND: typed window-system handle schemas.
• HCURSOR: cursor-handle alias of HICON.
• HDC and HGLRC: device-context and OpenGL rendering-context handle schemas.
• POINT, RECT, MSG, and MONITORINFO: geometry and message schemas.
• WINDOWPLACEMENT and WNDCLASSW: window placement and class-registration schemas.

Schema example

"windows/user32" use
"control" use

{} () {} [
  POINT fieldCount printStack _:;
  RECT 3 fieldName printStack _:;
  MSG 5 fieldName printStack _:;
] "main" exportFunction

Expected Output During Compilation

2
"bottom"
"pt"

Arguments and result conventions

• RegisterClassW.lpszClassName, CreateWindowExW.lpClassName, CreateWindowExW.lpWindowName, RegisterClassW.lpszMenuName, and LoadCursorW.lpCursorName are raw Natx inputs commonly used as zero-terminated UTF-16 addresses.
• ClientToScreen.lpPoint, GetMonitorInfoW.lpmi, PeekMessageW.lpMsg, and GetWindowPlacement.lpwndpl are caller-owned writable result storage.
• RegisterClassW.lpWndClass, SetWindowPlacement.lpwndpl, DispatchMessageW.lpMsg, and TranslateMessage.lpMsg are borrowed caller-owned inputs.
• Many declarations return one Int32 status, and a zero status commonly represents failure or absence of result.
• CreateWindowExW, MonitorFromWindow, GetDC, LoadCursorW, and SetCapture return typed handles.
• GetWindowLongPtrW and SetWindowLongPtrW return pointer-sized values directly and do not write through separate output pointers.

Message and window workflow

• WNDPROC receives the target window handle, one message ordinal, and pointer-sized wParam and lParam payloads.
• MSG stores the same message ordinal and payload fields together with timestamp and cursor position.
• DispatchMessageW forwards queued MSG content to the registered WNDPROC.
• TranslateMessage performs message translation before dispatch.
• DefWindowProcW is the default processing path for messages not handled by the custom WNDPROC.
• RegisterClassW publishes one WNDCLASSW description, CreateWindowExW creates one HWND, and GetDC acquires one HDC for that window.

Window lifecycle and ownership

• CreateWindowExW produces one window handle, and DestroyWindow destroys one window handle.
• ShowWindow, SetWindowPos, GetWindowPlacement, and SetWindowPlacement query or change one window placement or visibility state.
• SetCapture and ReleaseCapture form the mouse-capture pair.
• MonitorFromWindow and GetMonitorInfoW describe the monitor associated with one window.
• GetDC returns one HDC handle associated with the selected window. This module does not declare the matching release function.
• LoadCursorW returns one cursor handle suitable for class registration or later cursor use.

Imported functions

• CreateWindowExW and DestroyWindow: window creation and destruction functions.
• ShowWindow, SetWindowPos, GetWindowPlacement, and SetWindowPlacement: visibility, positioning, and restore-placement functions.
• RegisterClassW and DefWindowProcW: class registration and default window-procedure functions.
• DispatchMessageW, TranslateMessage, and PeekMessageW: queued-message translation and dispatch functions.
• MonitorFromWindow and GetMonitorInfoW: monitor lookup and monitor-description functions.
• SetCapture, ReleaseCapture, SetCursorPos, ShowCursor, and LoadCursorW: capture and cursor-control functions.
• GetDC and ClientToScreen: device-context acquisition and coordinate-conversion functions.
• GetWindowLongPtrW and SetWindowLongPtrW: pointer-sized window-value access functions.

Window-value access

• GetWindowLongPtrW and SetWindowLongPtrW are selected through uif.
• On pointer-sized targets, the imported functions are the pointer variants.
• Otherwise, the module imports GetWindowLongW and SetWindowLongW and exposes them through the pointer-sized names.
• The public stack effects remain pointer-sized in both cases because the exposed names use Intx.
• GetWindowLongPtrW reads one pointer-sized window-associated value, and SetWindowLongPtrW writes one pointer-sized value and returns the previous one.

Signature examples

Printing imported names during compilation shows the exact imported signatures. The printed window-value access signature already reflects the pointer-sized public name selected for the target.

"windows/user32" use
"control" use

{} Int32 {} [
  @CreateWindowExW printStack _:;
  @GetWindowLongPtrW printStack _:;
  @GetDC printStack _:;
  0
] "main" exportFunction

Expected Output During Compilation

{dwExStyle: Nat32; lpClassName: Natx; lpWindowName: Natx; dwStyle: Nat32; X: Int32; Y: Int32; nWidth: Int32; nHeight: Int32; hWndParent: {WND: (); unused: Int32;} Cref; hMenu: {MENU: (); unused: Int32;} Cref; hInstance: {INSTANCE: (); unused: Int32;} Cref; lpParam: Natx;} {WND: (); unused: Int32;} Cref {convention: "";} codeRef
{hWnd: {WND: (); unused: Int32;} Cref; nIndex: Int32;} Intx {convention: "";} codeRef
{hWnd: {WND: (); unused: Int32;} Cref;} {DC: (); unused: Int32;} Cref {convention: "";} codeRef

See also

• windows/kernel32: Kernel32 declarations for synchronization, process, thread, file, and timing helpers.
• windows/gdi32: GDI32 pixel-format and buffer-swap declarations.
• windows/opengl32: OpenGL32 WGL context declarations.
• windows/shell32: Shell folder path declarations.
• windows/unicode: UTF-8 to zero-terminated UTF-16 conversion helper.