汇编教程之进程

例子：

在下面的例子中，当用户选择菜单项“crate process”时我们创建一个新进程。它会去执行“"msgbox.exe”。如果用户想要终止新进程，可以选择菜单项“terminate process”。这时，应用程序检查欲终止的进程是否仍存在，若存在则调用TerminateProcess函数来终止它。

.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
.const
IDM_CREATE_PROCESS equ 1
IDM_TERMINATE equ 2
IDM_EXIT equ 3
.data
ClassName db "Win32ASMProcessClass",0
AppName db "Win32 ASM Process Example",0
MenuName db "FirstMenu",0
processInfo PROCESS_INFORMATION <>
programname db "msgbox.exe",0
.data?
hInstance HINSTANCE ?
CommandLine LPSTR ?
hMenu HANDLE ?
ExitCode DWORD ? ; contains the process exitcode status from GetExitCodeProcess call.
.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
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,WS_EX_CLIENTEDGE,ADDR ClassName,ADDR AppName,\
WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\
CW_USEDEFAULT,300,200,NULL,NULL,\
hInst,NULL
mov hwnd,eax
invoke ShowWindow, hwnd,SW_SHOWNORMAL
invoke UpdateWindow, hwnd
invoke GetMenu,hwnd
mov hMenu,eax
.WHILE TRUE
invoke GetMessage, ADDR msg,NULL,0,0
.BREAK .IF (!eax)
invoke TranslateMessage, ADDR msg
invoke DispatchMessage, ADDR msg
.ENDW
mov eax,msg.wParam
ret
WinMain endp
WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM
LOCAL startInfo:STARTUPINFO
.IF uMsg==WM_DESTROY
invoke PostQuitMessage,NULL
.ELSEIF uMsg==WM_INITMENUPOPUP
invoke GetExitCodeProcess,processInfo.hProcess,ADDR ExitCode
.if eax==TRUE
.if ExitCode==STILL_ACTIVE
invoke EnableMenuItem,hMenu,IDM_CREATE_PROCESS,MF_GRAYED
invoke EnableMenuItem,hMenu,IDM_TERMINATE,MF_ENABLED
.else
invoke EnableMenuItem,hMenu,IDM_CREATE_PROCESS,MF_ENABLED
invoke EnableMenuItem,hMenu,IDM_TERMINATE,MF_GRAYED
.endif
.else
invoke EnableMenuItem,hMenu,IDM_CREATE_PROCESS,MF_ENABLED
invoke EnableMenuItem,hMenu,IDM_TERMINATE,MF_GRAYED
.endif
.ELSEIF uMsg==WM_COMMAND
mov eax,wParam
.if lParam==0
.if ax==IDM_CREATE_PROCESS
.if processInfo.hProcess!=0
invoke CloseHandle,processInfo.hProcess
mov processInfo.hProcess,0
.endif
invoke GetStartupInfo,ADDR startInfo
invoke CreateProcess,ADDR programname,NULL,NULL,NULL,FALSE,\
NORMAL_PRIORITY_CLASS,\
NULL,NULL,ADDR startInfo,ADDR processInfo
invoke CloseHandle,processInfo.hThread
.elseif ax==IDM_TERMINATE
invoke GetExitCodeProcess,processInfo.hProcess,ADDR ExitCode
.if ExitCode==STILL_ACTIVE
invoke TerminateProcess,processInfo.hProcess,0
.endif
invoke CloseHandle,processInfo.hProcess
mov processInfo.hProcess,0
.else
invoke DestroyWindow,hWnd
.endif
.endif
.ELSE
invoke DefWindowProc,hWnd,uMsg,wParam,lParam
ret
.ENDIF
xor eax,eax
ret
WndProc endp
end start