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1 | ;------------------------------------------------------------------------------------------------------------------- | |
2 | ; Hello, Windows! in x86 ASM - (c) 2021 Dave's Garage - Use at your own risk, no warranty! | |
3 | ;------------------------------------------------------------------------------------------------------------------- | |
4 | ||
5 | ; Compiler directives and includes | |
6 | ||
7 | .386 ; Full 80386 instruction set and mode | |
8 | .model flat, stdcall ; All 32-bit and later apps are flat. Used to include "tiny, etc" | |
9 | option casemap:none ; Preserve the case of system identifiers but not our own, more or less | |
10 | ||
11 | ||
12 | ; Include files - headers and libs that we need for calling the system dlls like user32, gdi32, kernel32, etc | |
13 | include \masm32\include\windows.inc ; Main windows header file (akin to Windows.h in C) | |
14 | include \masm32\include\user32.inc ; Windows, controls, etc | |
15 | include \masm32\include\kernel32.inc ; Handles, modules, paths, etc | |
16 | include \masm32\include\gdi32.inc ; Drawing into a device context (ie: painting) | |
17 | ||
18 | ; Libs - information needed to link ou binary to the system DLL callss | |
19 | ||
20 | includelib \masm32\lib\kernel32.lib ; Kernel32.dll | |
21 | includelib \masm32\lib\user32.lib ; User32.dll | |
22 | includelib \masm32\lib\gdi32.lib ; GDI32.dll | |
23 | ||
24 | ; Forward declarations - Our main entry point will call forward to WinMain, so we need to define it here | |
25 | ||
26 | WinMain proto :DWORD, :DWORD, :DWORD, :DWORD ; Forward decl for MainEntry | |
27 | ||
28 | ; Constants and Datra | |
29 | ||
30 | WindowWidth equ 640 ; How big we'd like our main window | |
31 | WindowHeight equ 480 | |
32 | ||
33 | .DATA | |
34 | ||
35 | ClassName db "MyWinClass", 0 ; The name of our Window class | |
36 | AppName db "Dave's Tiny App", 0 ; The name of our main window | |
37 | ||
38 | .DATA? ; Uninitialized data - Basically just reserves address space | |
39 | ||
40 | hInstance HINSTANCE ? ; Instance handle (like the process id) of our application | |
41 | CommandLine LPSTR ? ; Pointer to the command line text we were launched with | |
42 | ||
43 | ;------------------------------------------------------------------------------------------------------------------- | |
44 | .CODE ; Here is where the program itself lives | |
45 | ;------------------------------------------------------------------------------------------------------------------- | |
46 | ||
47 | MainEntry proc | |
48 | ||
49 | LOCAL sui:STARTUPINFOA ; Reserve stack space so we can load and inspect the STARTUPINFO | |
50 | ||
51 | push NULL ; Get the instance handle of our app (NULL means ourselves) | |
52 | call GetModuleHandle ; GetModuleHandle will return instance handle in EAX | |
53 | mov hInstance, eax ; Cache it in our global variable | |
54 | ||
55 | call GetCommandLineA ; Get the command line text ptr in EAX to pass on to main | |
56 | mov CommandLine, eax | |
57 | ||
58 | ; Call our WinMain and then exit the process with whatever comes back from it | |
59 | ||
60 | ; Please check this, I have only typed it, not tested it :-) | |
61 | ||
62 | lea eax, sui ; Get the STARTUPINFO for this process | |
63 | push eax | |
64 | call GetStartupInfoA ; Find out if wShowWindow should be used | |
65 | test sui.dwFlags, STARTF_USESHOWWINDOW | |
66 | jz @1 | |
67 | push sui.wShowWindow ; If the show window flag bit was nonzero, we use wShowWindow | |
68 | jmp @2 | |
69 | @1: | |
70 | push SW_SHOWDEFAULT ; Use the default | |
71 | @2: | |
72 | push CommandLine | |
73 | push NULL | |
74 | push hInstance | |
75 | call WinMain | |
76 | ||
77 | push eax | |
78 | call ExitProcess | |
79 | ||
80 | MainEntry endp | |
81 | ||
82 | ; | |
83 | ; WinMain - The traditional signature for the main entry point of a Windows programa | |
84 | ; | |
85 | ||
86 | WinMain proc hInst:HINSTANCE, hPrevInst:HINSTANCE, CmdLine:LPSTR, CmdShow:DWORD | |
87 | ||
88 | LOCAL wc:WNDCLASSEX ; Create these vars on the stack, hence LOCAL | |
89 | LOCAL msg:MSG | |
90 | LOCAL hwnd:HWND | |
91 | ||
92 | mov wc.cbSize, SIZEOF WNDCLASSEX ; Fill in the values in the members of our windowclass | |
93 | mov wc.style, CS_HREDRAW or CS_VREDRAW ; Redraw if resized in either dimension | |
94 | mov wc.lpfnWndProc, OFFSET WndProc ; Our callback function to handle window messages | |
95 | mov wc.cbClsExtra, 0 ; No extra class data | |
96 | mov wc.cbWndExtra, 0 ; No exttra window data | |
97 | mov eax, hInstance | |
98 | mov wc.hInstance, eax ; Our instance handle | |
99 | mov wc.hbrBackground, COLOR_3DSHADOW+1 ; Default brush colors are color plus one | |
100 | mov wc.lpszMenuName, NULL ; No app menu | |
101 | mov wc.lpszClassName, OFFSET ClassName ; The window's class name | |
102 | ||
103 | push IDI_APPLICATION ; Use the default application icon | |
104 | push NULL | |
105 | call LoadIcon | |
106 | mov wc.hIcon, eax | |
107 | mov wc.hIconSm, eax | |
108 | ||
109 | push IDC_ARROW ; Get the default "arrow" mouse cursor | |
110 | push NULL | |
111 | call LoadCursor | |
112 | mov wc.hCursor, eax | |
113 | ||
114 | lea eax, wc | |
115 | push eax | |
116 | call RegisterClassEx ; Register the window class | |
117 | ||
118 | push NULL ; Bonus data, but we have none, so null | |
119 | push hInstance ; Our app instance handle | |
120 | push NULL ; Menu handle | |
121 | push NULL ; Parent window (if we were a child window) | |
122 | push WindowHeight ; Our requested height | |
123 | push WindowWidth ; Our requested width | |
124 | push CW_USEDEFAULT ; Y | |
125 | push CW_USEDEFAULT ; X | |
126 | push WS_OVERLAPPEDWINDOW + WS_VISIBLE ; Window stytle (normal and visible) | |
127 | push OFFSET AppName ; The window title (our application name) | |
128 | push OFFSET ClassName ; The window class name of what we're creating | |
129 | push 0 ; Extended style bits, if any | |
130 | call CreateWindowExA | |
131 | cmp eax, NULL | |
132 | je WinMainRet ; Fail and bail on NULL handle returned | |
133 | mov hwnd, eax ; Window handle is the result, returned in eax | |
134 | ||
135 | push eax ; Force a paint of our window | |
136 | call UpdateWindow | |
137 | ||
138 | MessageLoop: | |
139 | ||
140 | push 0 | |
141 | push 0 | |
142 | push NULL | |
143 | lea eax, msg | |
144 | push eax | |
145 | call GetMessage ; Get a message from the application's message queue | |
146 | ||
147 | cmp eax, 0 ; When GetMessage returns 0, it's time to exit | |
148 | je DoneMessages | |
149 | ||
150 | lea eax, msg ; Translate 'msg' | |
151 | push eax | |
152 | call TranslateMessage | |
153 | ||
154 | lea eax, msg ; Dispatch 'msg' | |
155 | push eax | |
156 | call DispatchMessage | |
157 | ||
158 | jmp MessageLoop | |
159 | ||
160 | DoneMessages: | |
161 | ||
162 | mov eax, msg.wParam ; Return wParam of last message processed | |
163 | ||
164 | WinMainRet: | |
165 | ||
166 | ret | |
167 | ||
168 | WinMain endp | |
169 | ||
170 | ; | |
171 | ; WndProc - Our Main Window Procedure, handles painting and exiting | |
172 | ; | |
173 | ||
174 | WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM | |
175 | ||
176 | LOCAL ps:PAINTSTRUCT ; Local stack variables | |
177 | LOCAL rect:RECT | |
178 | LOCAL hdc:HDC | |
179 | ||
180 | cmp uMsg, WM_DESTROY | |
181 | jne NotWMDestroy | |
182 | ||
183 | push 0 ; WM_DESTROY received, post our quit msg | |
184 | call PostQuitMessage ; Quit our application | |
185 | xor eax, eax ; Return 0 to indicate we handled it | |
186 | ret | |
187 | ||
188 | NotWMDestroy: | |
189 | ||
190 | cmp uMsg, WM_PAINT | |
191 | jne NotWMPaint | |
192 | ||
193 | lea eax, ps ; WM_PAINT received | |
194 | push eax | |
195 | push hWnd | |
196 | call BeginPaint ; Go get a device context to paint into | |
197 | mov hdc, eax | |
198 | ||
199 | push TRANSPARENT | |
200 | push hdc | |
201 | call SetBkMode ; Make text have a transparent background | |
202 | ||
203 | lea eax, rect ; Figure out how big the client area is so that we | |
204 | push eax ; can center our content over it | |
205 | push hWnd | |
206 | call GetClientRect | |
207 | ||
208 | push DT_SINGLELINE + DT_CENTER + DT_VCENTER | |
209 | lea eax, rect | |
210 | push eax | |
211 | push -1 | |
212 | push OFFSET AppName | |
213 | push hdc | |
214 | call DrawText ; Draw text centered vertically and horizontally | |
215 | ||
216 | lea eax, ps | |
217 | push eax | |
218 | push hWnd | |
219 | call EndPaint ; Wrap up painting | |
220 | ||
221 | xor eax, eax ; Return 0 as no further processing needed | |
222 | ret | |
223 | ||
224 | NotWMPaint: | |
225 | ||
226 | push lParam | |
227 | push wParam | |
228 | push uMsg | |
229 | push hWnd | |
230 | call DefWindowProc ; Forward message on to default processing and | |
231 | ret ; return whatever it does | |
232 | ||
233 | WndProc endp | |
234 | ||
235 | END MainEntry ; Specify entry point, else _WinMainCRTStartup is assumed | |
236 | ||
237 |