參考資訊:
http://www.winprog.org/tutorial/
http://winapi.freetechsecrets.com/win32/
https://github.com/gammasoft71/Examples_Win32
屏幕的最小顯示單位是像素,像素由紅色(Red)、綠色(Green)、藍色(Blue)、Alpha等四個顏色組成,因此,在呼叫CreateWindow()時,傳入的解析度,如:300x300,代表該視窗(有效區域)的X軸有300個像素,而Y軸則是有300個像素,這個300x300像素的區域是可以用來繪製任何東西,WM_PAINT是處理視窗重新繪畫的事件,繪畫的相關處理都需要在這個事件完成,比較特別的是,Windows視窗將繪圖的許多東西抽象化,最基本的需求是:一個DC(Device Context)和一個BITMAP,DC可以想像成是一個畫台,而BITMAP則是一片畫布(Buffer),DC有了Buffer就可以畫上任何東西並將其顯示在視窗上
main.asm
.386 .model flat,stdcall option casemap:none include c:\masm32\include\msvcrt.inc include c:\masm32\include\windows.inc include c:\masm32\include\kernel32.inc include c:\masm32\include\gdi32.inc include c:\masm32\include\user32.inc includelib c:\masm32\lib\msvcrt.lib includelib c:\masm32\lib\gdi32.lib includelib c:\masm32\lib\user32.lib includelib c:\masm32\lib\kernel32.lib .data szCaption db "main",0 hWin dd 0 hInstance dd 0 CommandLine dd 0 defWndProc dd 0 .code WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM local hdc:dword local x:dword local y:dword local ps:PAINTSTRUCT .if uMsg == WM_PAINT invoke BeginPaint, hWnd, addr ps mov hdc, eax xor eax, eax mov y, eax ylp: xor eax, eax mov x, eax xlp: invoke SetPixel, hdc, x, y, 0ffh inc x cmp x, 100 jb xlp inc y cmp y, 100 jb ylp invoke EndPaint, hWnd, addr ps xor eax, eax ret .elseif uMsg == WM_CLOSE invoke DestroyWindow, hWnd xor eax, eax ret .elseif uMsg == WM_DESTROY invoke PostQuitMessage, 0 xor eax, eax ret .endif invoke CallWindowProc, defWndProc, hWnd, uMsg, wParam, lParam ret WndProc endp WinMain proc hInst:DWORD, hPrevInst:DWORD, CmdLine:DWORD, CmdShow:DWORD local msg:MSG invoke CreateWindowEx, WS_EX_LEFT, WC_DIALOG, offset szCaption, WS_OVERLAPPEDWINDOW or WS_VISIBLE, 0, 0, 300, 300, NULL, NULL, NULL, NULL mov hWin, eax invoke SetWindowLong, hWin, GWL_WNDPROC, WndProc mov defWndProc, eax @@: invoke GetMessage, addr msg, NULL, 0, 0 cmp eax, 0 je @f invoke DispatchMessage, addr msg jmp @b @@: mov eax, msg.wParam ret WinMain endp start: invoke GetModuleHandle, NULL mov hInstance, eax invoke GetCommandLine mov CommandLine, eax invoke WinMain, hInstance, NULL, CommandLine, SW_SHOWDEFAULT invoke ExitProcess, eax end start
Line 30~50:處理繪畫事件
Line 31~32:取得視窗的DC,該DC已經有Buffer可以使用,因此,可以直接在上面繪製任何東西
Line 34~46:透過SetPixel()畫出一個正方形,顏色是紅色
Line 48:結束繪製
完成