Win32 API Structures

Structures are data types used to group related data items together. They are fundamental building blocks for many Windows API functions and operations.

General Structures

`RECT`

Defines the coordinates of the upper-left and lower-right corners of a rectangle.


                                typedef struct _RECT { 

                                        LONG left; 

                                        LONG top; 

                                        LONG right; 

                                        LONG bottom; 

                                \} RECT;

Members:

left: The x-coordinate of the upper-left corner.
top: The y-coordinate of the upper-left corner.
right: The x-coordinate of the lower-right corner.
bottom: The y-coordinate of the lower-right corner.

`POINT`

Specifies a point in two-dimensional space.


                                typedef struct _POINT { 

                                        LONG x; 

                                        LONG y; 

                                \} POINT;

Members:

x: The x-coordinate of the point.
y: The y-coordinate of the point.

Memory Management Structures

`MEMORYSTATUSEX`

Contains information about the current memory utilization of the local computer. This structure is an extension of the MEMORYSTATUS structure.


                                typedef struct _MEMORYSTATUSEX { 

                                        DWORD dwLength; 

                                        DWORD dwMemoryLoad; 

                                        SIZE_T ullTotalPhys; 

                                        SIZE_T ullAvailPhys; 

                                        SIZE_T ullTotalPageFile; 

                                        SIZE_T ullAvailPageFile; 

                                        SIZE_T ullTotalVirtual; 

                                        SIZE_T ullAvailVirtual; 

                                        SIZE_T ullAvailExtendedVirtual; 

                                \} MEMORYSTATUSEX;

Members:

dwLength: The size of the structure, in bytes.
dwMemoryLoad: A number between 0 and 100 (inclusive) indicating the approximate percentage of physical memory currently in use.
ullTotalPhys: The total size of physical memory, in bytes.
ullAvailPhys: The available physical memory, in bytes.
ullTotalPageFile: The total size of the memory-backed page file, in bytes.
ullAvailPageFile: The available size of the memory-backed page file, in bytes.
ullTotalVirtual: The total size of the user-mode virtual memory, in bytes.
ullAvailVirtual: The available user-mode virtual memory, in bytes.
ullAvailExtendedVirtual: The extended available virtual memory, in bytes.

Processes and Threads Structures

`PROCESS_INFORMATION`

Contains information about a newly created process and its primary thread.


                                typedef struct _PROCESS_INFORMATION { 

                                        HANDLE hProcess; 

                                        HANDLE hThread; 

                                        DWORD dwProcessId; 

                                        DWORD dwThreadId; 

                                \} PROCESS_INFORMATION;

Members:

hProcess: A handle to the new process.
hThread: A handle to the primary thread of the new process.
dwProcessId: A non-zero, unique value representing the process ID.
dwThreadId: A non-zero, unique value representing the thread ID.

Window Management Structures

`WINDOWINFO`

Contains information about a window.


                                typedef struct tagWINDOWINFO { 

                                        DWORD cbSize; 

                                        RECT rcWindow; 

                                        RECT rcClient; 

                                        DWORD dwStyle; 

                                        DWORD dwExStyle; 

                                        DWORD dwWindowStatus; 

                                        UINT cxWindowBorders; 

                                        UINT cyWindowBorders; 

                                        ATOM atomWindowType; 

                                        WORD wCreatorVersion; 

                                \} WINDOWINFO;

Members:

cbSize: The size of the structure, in bytes.
rcWindow: The coordinates of the window.
rcClient: The coordinates of the window's client area.
dwStyle: The window styles.
dwExStyle: The extended window styles.
dwWindowStatus: The window status.
cxWindowBorders: The width of the window borders.
cyWindowBorders: The height of the window borders.
atomWindowType: The window class atom.
wCreatorVersion: The version of the application that created the window.

This is a partial list of commonly used Win32 API structures. For a comprehensive list, please refer to the official Microsoft documentation.