參考資訊:
http://www.winprog.org/tutorial/
http://winapi.freetechsecrets.com/win32/
https://github.com/gammasoft71/Examples_Win32
當視窗的可視區域(如:300x300像素)小於顯示圖片大小(如:640x480像素)時,這時可以使用Windows視窗元件Scrollbar,用來做顯示位置調整的動作,Scrollbar元件有垂直和水平兩種方向並且提供視窗事件回報機制(WM_VSCROLL、WM_HSCROLL),因此,這裡的Scrollbar元件並不能夠自動幫忙做顯示位置調整的動作,取而代之的是,在收到WM_VSCROLL、WM_HSCROLL事件時,使用者必須自己決定哪些東西要顯示在視窗的可視區域上
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\user32.inc includelib c:\masm32\lib\msvcrt.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 SLUP db "LINE++",0 SLDN db "LINE--",0 SPUP db "PAGE++",0 SPDN db "PAGE--",0 .code WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM .if uMsg == WM_VSCROLL mov eax, wParam and eax, 0fffh .if eax == SB_LINEUP invoke SetWindowText, hWnd, offset SLUP .elseif eax == SB_LINEDOWN invoke SetWindowText, hWnd, offset SLDN .elseif eax == SB_PAGEUP invoke SetWindowText, hWnd, offset SPUP .elseif eax == SB_PAGEDOWN invoke SetWindowText, hWnd, offset SPDN .endif 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 or WS_VSCROLL, 0, 0, 300, 300, NULL, NULL, NULL, NULL mov hWin, eax invoke SetWindowLong, hWin, GWL_WNDPROC, WndProc mov defWndProc, eax invoke SetScrollRange, hWin, SB_VERT, 0, 100, FALSE invoke SetScrollPos, hWin, SB_VERT, 50, TRUE @@: 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 27~40:處理Scrollbar訊息並且顯示在視窗標題
Line 59:WS_VSCROLL是垂直的Scrollbar,WS_HSCROLL則是水平的Scrollbar
Line 65:設定Scrollbar最大的範圍
Line 66:設定Scrollbar目前的位置
完成