第八课 菜单
.386
.model flat,stdcall
option casemap:none
WinMain proto :DWORD,:DWORD,:DWORD,:DWORD
include \masm32\include\windows.inc
include \masm32\include\user32.inc
include \masm32\include\kernel32.inc
includelib \masm32\lib\user32.lib
includelib \masm32\lib\kernel32.lib
.data
ClassName db "SimpleWinClass",0
AppName db "Our First Window",0
MenuName db "FirstMenu",0
; The name of our menu in the resource file.
Test_string db "You selected Test menu item",0
Hello_string db "Hello, my friend",0
Goodbye_string db "See you again, bye",0
.data?
hInstance HINSTANCE ?
CommandLine LPSTR ?
.const
IDM_TEST equ 1
; Menu IDs
IDM_HELLO equ 2
IDM_GOODBYE equ 3
IDM_EXIT equ 4
.code
start:
invoke GetModuleHandle, NULL
mov hInstance,eax
invoke GetCommandLine
mov CommandLine,eax
invoke WinMain, hInstance,NULL,CommandLine, SW_SHOWDEFAULT
invoke ExitProcess,eax
WinMain proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD
LOCAL wc:WNDCLASSEX
LOCAL msg:MSG
LOCAL hwnd:HWND
mov wc.cbSize,SIZEOF WNDCLASSEX
mov wc.style, CS_HREDRAW or CS_VREDRAW
mov wc.lpfnWndProc, OFFSET WndProc
mov wc.cbClsExtra,NULL
mov wc.cbWndExtra,NULL
push hInst
pop wc.hInstance
mov wc.hbrBackground,COLOR_WINDOW+1
mov wc.lpszMenuName,OFFSET MenuName
; Put our menu name here
mov wc.lpszClassName,OFFSET ClassName
invoke LoadIcon,NULL,IDI_APPLICATION
mov wc.hIcon,eax
mov wc.hIconSm,eax
invoke LoadCursor,NULL,IDC_ARROW
mov wc.hCursor,eax
invoke RegisterClassEx, addr wc
invoke CreateWindowEx,NULL,ADDR ClassName,ADDR AppName,\
WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,\
hInst,NULL
mov hwnd,eax
invoke ShowWindow, hwnd,SW_SHOWNORMAL
invoke UpdateWindow, hwnd
.WHILE TRUE
invoke GetMessage, ADDR msg,NULL,0,0
.BREAK .IF (!eax)
invoke DispatchMessage, ADDR msg
.ENDW
mov eax,msg.wParam
ret
WinMain endp
WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM
.IF uMsg==WM_DESTROY
invoke PostQuitMessage,NULL
.ELSEIF uMsg==WM_COMMAND
mov eax,wParam
.IF ax==IDM_TEST
invoke
MessageBox,NULL,ADDR Test_string,OFFSET AppName,MB_OK
.ELSEIF ax==IDM_HELLO
invoke
MessageBox, NULL,ADDR Hello_string, OFFSET AppName,MB_OK
.ELSEIF ax==IDM_GOODBYE
invoke
MessageBox,NULL,ADDR Goodbye_string, OFFSET AppName, MB_OK
.ELSE
invoke
DestroyWindow,hWnd
.ENDIF
.ELSE
invoke DefWindowProc,hWnd,uMsg,wParam,lParam
ret
.ENDIF
xor eax,eax
ret
WndProc endp
end start
**************************************************************************************************************************
#define IDM_TEST 1
#define IDM_HELLO 2
#define IDM_GOODBYE 3
#define IDM_EXIT 4
FirstMenu MENU
{
POPUP "&PopUp"
{
MENUITEM "&Say Hello",IDM_HELLO
MENUITEM "Say &GoodBye",
IDM_GOODBYE
MENUITEM SEPARATOR
MENUITEM "E&xit",IDM_EXIT
}
MENUITEM "&Test", IDM_TEST
}
FirstMenu MENU
用关键字MENU定义菜单。
POPUP "&PopUp"
{
MENUITEM "&Say Hello",IDM_HELLO
MENUITEM "Say &GoodBye",
IDM_GOODBYE
MENUITEM SEPARATOR
MENUITEM "E&xit",IDM_EXIT
}
定义一个有四个菜单项的子菜单,其中第三个菜单项是一个分隔线。
MENUITEM "&Test", IDM_TEST
定义主菜单中的一项。下面我们来看看源代码。
.ELSEIF uMsg==WM_COMMAND
mov eax,wParam
.IF ax==IDM_TEST
invoke
MessageBox,NULL,ADDR Test_string,OFFSET AppName,MB_OK
.ELSEIF ax==IDM_HELLO
invoke
MessageBox, NULL,ADDR Hello_string, OFFSET AppName,MB_OK
.ELSEIF ax==IDM_GOODBYE
invoke
MessageBox,NULL,ADDR Goodbye_string, OFFSET AppName, MB_OK
.ELSE
invoke
DestroyWindow,hWnd
.ENDIF
在本窗口过程中我们处理WM_COMMAND消息。当用户选择了一个菜单项时,该菜单项的ID放入参数wParam中被同时送到WINDOWS的窗口过程,我们把它保存到eax寄存器中以便和预定义的菜单项ID比较用。前三种情况下,当我们选中Test、Say Hello、Say GoodBye菜单项时,会弹出一个对话框其中显示一个相关的字符串,选择Exit菜单项时,我们就调用函数DestroyWindow,其中的参数是我们窗口的句柄,这样就销毁了窗口。
就像您所看到的,通过在一个窗口类中指定菜单名的方法来给一个应用程序生成一个菜单是简单而直观的。除此方法外您还可以用另一种方法,其中资源文件是一样的,源文件中也只有少数的改动,这些改动如下:
invoke LoadMenu, hInst, OFFSET
MenuName
mov hMenu,eax
INVOKE CreateWindowEx,NULL,ADDR
ClassName,ADDR AppName,\
WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,hMenu,\
hInst,NULL
调用LoadMenu函数,该函数需要实例句柄和菜单名的字符串,调用的结果返回指向菜单的句柄,然后传给函数CreateWindowEx刚返回的菜单句柄就可以了。