Winapi Win32绘图应用程序

我必须在Windows中编写一个类似paint的程序。我用的是MASM32。一切正常，但当我移动鼠标画图时，它会画一条虚线，而不是实线

请帮我解决这个问题：（我们有其他的想法吗？ 谢谢你，很抱歉我的英语不好

附言：看一张图片，看看我的问题

.386    ; use 80386 instruction
.model flat,stdcall ; uses flat memory addressing model
option casemap:none

include C:\masm32\include\windows.inc   ; windows.inc have structures and constants
include C:\masm32\include\user32.inc 
includelib C:\masm32\lib\user32.lib ; CreateWindowEx, RegisterClassEx,...
include C:\masm32\include\kernel32.inc 
includelib C:\masm32\lib\kernel32.lib   ; ExitProcess
include C:\masm32\include\masm32.inc
includelib C:\masm32\lib\masm32.lib
include C:\masm32\include\gdi32.inc 
includelib C:\masm32\lib\gdi32.lib 

.CONST
DRAWING equ 1
WAITING equ 0

.DATA
ClassName db 'SimpleWinClass',0
AppName db 'Paint',0

labelNoti db 'Notification',0
labelClick db 'Start draw!',0
labelRelease db 'Stop draw!',0
labelDrawing db 'Drawing...',0
labelWaiting db 'Waiting.',0

object db '.',0
fontName db 'myfont',0

StaticClassName db 'static',0
X dw 'x',0
Y dw 'y',0

state db WAITING

.DATA?
; HINSTANCE & LPSTR typedef DWORD in windows.inc
; reserve the space for future use
hInstance HINSTANCE ?
CommandLine LPSTR ?
hitpoint POINT <>

; use for create window
wc WNDCLASSEX <?>
msg MSG <?> ; handle message
hwnd HWND ? ; handle window procedure

hwndX HWND ?
hwndY HWND ?
hwndState HWND ?

hdc HDC ?
ps PAINTSTRUCT <?>

font HGDIOBJ ?
hFont HFONT ?

.CODE
start:
    ; call GetModuleHandle(null)
    ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms683199(v=vs.85).aspx
    push NULL
    call GetModuleHandle    ; module handle same as instance handle in Win32
    mov hInstance, eax  ; return an instance to handle in eax

    ; call GetCommandLine()
    ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms683156(v=vs.85).aspx
    call GetCommandLine ; no parameters
    mov CommandLine, eax    ; return a pointer to the command-line for current process

    ; call WinMain(hInstance, hPrevInstance, CmdLine, CmdShow)
    ; our main function
    push SW_SHOW
    push CommandLine
    push NULL
    push hInstance
    call WinMain

    ; call ExitProcess
    push eax
    call ExitProcess

    ; Define WinMain 
    WinMain proc hInst:HINSTANCE, hPrevInst:HINSTANCE, CmdLine:LPSTR, CmdShow:DWORD
        ; Structure in msdn, define in windows.inc
        ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms633577(v=vs.85).aspx

        ; Load default icon
        push IDI_APPLICATION
        push NULL
        call LoadIcon
        mov wc.hIcon, eax
        mov wc.hIconSm, eax

        ; Load default cursor
        push IDC_ARROW
        push NULL
        call LoadCursor
        mov wc.hCursor, eax

        mov wc.cbSize, SIZEOF WNDCLASSEX    ; size of this structure
        mov wc.style, CS_HREDRAW or CS_VREDRAW  ; style of windows https://msdn.microsoft.com/en-us/library/windows/desktop/ff729176(v=vs.85).aspx
        mov wc.lpfnWndProc, OFFSET WndProc  ; andress of window procedure
        mov wc.cbClsExtra, NULL 
        mov wc.cbWndExtra, NULL
        push hInstance
        pop wc.hInstance
        mov wc.hbrBackground,COLOR_WINDOW+1 ; background color, require to add 1
        mov wc.lpszMenuName, NULL
        mov wc.lpszClassName, OFFSET ClassName

        ; we register our own class, named in ClassName
        push offset wc
        call RegisterClassEx

        ; after register ClassName, we use it to create windows compond
        ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms632680(v=vs.85).aspx
        push NULL
        push hInstance
        push NULL
        push NULL
        push 600
        push 600
        push CW_USEDEFAULT
        push CW_USEDEFAULT
        push WS_OVERLAPPEDWINDOW
        push offset AppName
        push offset ClassName
        push WS_EX_CLIENTEDGE
        call CreateWindowEx

        mov hwnd, eax   ; return windows handle

        ; display window
        ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms633548(v=vs.85).aspx
        push CmdShow
        push hwnd
        call ShowWindow

        ; update window
        ; https://msdn.microsoft.com/en-us/library/windows/desktop/dd145167(v=vs.85).aspx
        push hwnd
        call UpdateWindow

        ; Message Loop
        MESSAGE_LOOP:
            ; get message
            ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms644936(v=vs.85).aspx
            push 0
            push 0
            push NULL
            push offset msg
            call GetMessage

            ; return in eax
            ; if the function retrieves a message other than WM_QUIT, the return value is nonzero.
            ; if the function retrieves the WM_QUIT message, the return value is zero.
            cmp eax, 0
            jle END_LOOP

            ; translate virtual-key messages into character messages - ASCII in WM_CHAR
            ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms644955(v=vs.85).aspx
            push offset msg
            call TranslateMessage 

            ; sends the message data to the window procedure responsible for the specific window the message is for.
            ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms644934(v=vs.85).aspx
            push offset msg
            call DispatchMessage
        jmp MESSAGE_LOOP

        END_LOOP:
            mov eax, msg.wParam   
        ret 
    WinMain endp

    ; Handle message with switch(notification)
    ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms633573(v=vs.85).aspx
    WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM
        ; close app
        cmp uMsg, WM_DESTROY
        je ON_WM_DESTROY

        cmp uMsg, WM_CREATE
        je ON_WM_CREATE

        cmp uMsg, WM_PAINT
        je ON_WM_PAINT

        cmp uMsg, WM_LBUTTONDOWN
        je ON_WM_LBUTTONDOWN

        cmp uMsg, WM_LBUTTONUP
        je ON_WM_LBUTTONUP

        cmp uMsg, WM_MOUSEMOVE
        je ON_WM_MOUSEMOVE

        jmp ON_DEFAULT

        ; user close program
        ON_WM_DESTROY:
            push NULL
            call PostQuitMessage
            jmp EXIT

        ON_WM_CREATE:
            ; create static text
            push NULL
            push hInstance
            push 1
            push hWnd
            push 25
            push 50
            push 20
            push 20
            push WS_CHILD or WS_VISIBLE or WS_BORDER or ES_LEFT
            push offset X
            push offset StaticClassName
            push WS_EX_CLIENTEDGE
            call CreateWindowEx
            mov hwndX, eax

            ; create static text
            push NULL
            push hInstance
            push 1
            push hWnd
            push 25
            push 50
            push 20
            push 90
            push WS_CHILD or WS_VISIBLE or WS_BORDER or ES_LEFT
            push offset Y
            push offset StaticClassName
            push WS_EX_CLIENTEDGE
            call CreateWindowEx
            mov hwndY, eax

            ; create static text
            push NULL
            push hInstance
            push 1
            push hWnd
            push 25
            push 80
            push 60
            push 20
            push WS_CHILD or WS_VISIBLE or WS_BORDER or ES_LEFT
            push offset labelWaiting
            push offset StaticClassName
            push WS_EX_CLIENTEDGE
            call CreateWindowEx
            mov hwndState, eax

            push offset fontName
            push DEFAULT_PITCH or FF_DONTCARE
            push DEFAULT_QUALITY
            push CLIP_DEFAULT_PRECIS
            push CLIP_DEFAULT_PRECIS
            push DEFAULT_CHARSET
            push FALSE
            push FALSE
            push FALSE
            push 700
            push 0
            push 0
            push 16
            push 24
            call CreateFont
            mov font, eax

            jmp EXIT

        ON_WM_LBUTTONDOWN:
            mov [state], DRAWING

            push offset labelDrawing
            push hwndState
            call SetWindowText
            jmp EXIT

        ON_WM_LBUTTONUP:
            mov [state], WAITING

            push offset labelWaiting
            push hwndState
            call SetWindowText
            jmp EXIT

        ON_WM_MOUSEMOVE:
            push lParam
            call updateXY

            cmp [state], DRAWING
            je DRAW
            jne EXIT

            DRAW:
                push FALSE
                push NULL
                push hWnd 
                call InvalidateRect

            jmp EXIT

        ON_WM_PAINT:
            push offset ps
            push hWnd
            call BeginPaint
            mov hdc, eax

            push font
            push hdc
            call SelectObject

            mov hFont, eax

            push 1
            push offset object
            push hitpoint.y
            push hitpoint.x
            push hdc
            call TextOut

            push hFont
            push hWnd
            call SelectObject

            push offset ps
            push hWnd 
            call EndPaint

            jmp EXIT

        ON_DEFAULT:
            ; handle any message that program don't handle
            ; https://msdn.microsoft.com/en-us/library/windows/desktop/ms633572(v=vs.85).aspx
            push lParam 
            push wParam 
            push uMsg   ; message
            push hWnd   ; windows
            call DefWindowProc
            jmp EXIT

        EXIT:
            ret
    WndProc endp

    updateXY proc lParam:LPARAM
            mov eax, lParam

            xor ebx, ebx
            mov bx, ax

            mov hitpoint.x, ebx

            push offset X
            push ebx
            call dwtoa

            push offset X
            push hwndX
            call SetWindowText

            mov eax, lParam
            shr eax, 16

            mov hitpoint.y, eax

            push offset Y
            push eax
            call dwtoa

            push offset Y
            push hwndY
            call SetWindowText
        ret
    updateXY endp

end start

.386；使用80386指令
.model flat，stdcall；使用平面内存寻址模型
选项案例图：无
include C:\masm32\include\windows.inc；windows.inc具有结构和常量
包括C:\masm32\include\user32.inc
includelib C:\masm32\lib\user32.lib；CreateWindowEx，RegisterClassEx，。。。
包含C:\masm32\include\kernel32.inc
includelib C:\masm32\lib\kernel32.lib；ExitProcess
包括C:\masm32\include\masm32.inc
includelib C:\masm32\lib\masm32.lib
包括C:\masm32\include\gdi32.inc
includelib C:\masm32\lib\gdi32.lib
康斯特先生
图纸equ 1
等待equ 0
.数据
类名数据库“SimpleWinClass”，0
AppName数据库“绘制”，0
labelNoti数据库“通知”，0
labelClick数据库“开始绘制！”，0
labelRelease数据库“停止绘制！”，0
labelDrawing数据库“Drawing…”，0
labelWaiting数据库“正在等待”，0
对象数据库“”，0
fontName数据库“myfont”，0
StaticClassName数据库“静态”，0
X dw'X'，0
Y-dw'Y'，0
状态数据库等待
.数据？
；windows.inc.中的HINSTANCE和LPSTR typedef DWORD
；保留空间供将来使用
hInstance hInstance？
命令行LPSTR？
生命点
；用于创建窗口
wc WNDCLASSEX
处理消息
hwnd hwnd？；句柄窗口过程
hwndX HWND？
hwndY HWND？
州政府？
hdc hdc？
ps PAINTSTRUCT
字体HGDIOBJ？
哈丰哈丰？
.代码
开始：
；调用GetModuleHandle（null）
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms683199（v=vs.85）.aspx
推空
调用GetModuleHandle；模块句柄与Win32中的实例句柄相同
mov hInstance，eax；返回要在eax中处理的实例
；调用GetCommandLine（）
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms683156（v=vs.85）.aspx
调用GetCommandLine；无参数
mov命令行，eax；返回指向当前进程的命令行的指针
；调用WinMain（hInstance、HPPreInstance、CmdLine、CmdShow）
；我们的主要职能
推送SW_SHOW
推命令行
推空
推挤站姿
打电话给WinMain
；呼叫出口程序
推送eax
呼叫退出过程
；定义WinMain
WinMain proc hInst:HINSTANCE、hPrevInst:HINSTANCE、CmdLine:LPSTR、CmdShow:DWORD
；msdn中的结构，在windows.inc中定义
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms633577（v=vs.85）.aspx
；加载默认图标
推送IDI_应用程序
推空
调用加载图标
莫夫·沃克·希肯，埃克斯
mov wc.hIconSm，eax
；加载默认光标
按箭头
推空
调用LoadCursor
mov wc.hCursor，eax
mov wc.cbSize，WNDCLASSEX的尺寸；此结构的尺寸
mov wc.style、CS_HREDRAW或CS_VREDRAW；窗口样式https://msdn.microsoft.com/en-us/library/windows/desktop/ff729176（v=vs.85）.aspx
mov wc.lpfnWndProc，偏移量WndProc；窗口程序的安德鲁斯
mov wc.cbClsExtra，NULL
mov wc.cbWndExtra，空
推挤站姿
流行语
mov wc.hbrBackground，颜色窗口+1；背景色，需要添加1
mov wc.lpszMenuName，NULL
mov wc.lpszClassName，偏移量ClassName
；我们注册我们自己的类，以ClassName命名
推偏wc
调用注册表类
；注册类名后，我们使用它创建windows组件
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms632680（v=vs.85）.aspx
推空
推挤站姿
推空
推空
推600
推600
按顺时针方向按默认值
按顺时针方向按默认值
按WS_重叠窗口
推送偏移量AppName
推送偏移类名
推送WS_EX_客户
调用CreateWindowEx
mov hwnd，eax；返回窗口句柄
；显示窗口
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms633548（v=vs.85）.aspx
推送CmdShow
推送
呼叫显示窗口
；更新窗口
; https://msdn.microsoft.com/en-us/library/windows/desktop/dd145167（v=vs.85）.aspx
推送
调用UpdateWindow
；消息循环
消息循环：
；得到消息
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms644936（v=vs.85）.aspx
推0
推0
推空
推送偏移量消息
调用GetMessage
；返回eax
；如果函数检索到WM_QUIT以外的消息，则返回值为非零。
；如果函数检索WM_QUIT消息，则返回值为零。
cmp-eax，0
端环
；将虚拟密钥消息转换为字符消息-WM_CHAR中的ASCII
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms644955（v=vs.85）.aspx
推送偏移量消息
呼叫翻译消息
；将消息数据发送到负责消息所针对的特定窗口的窗口过程。
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms644934（v=vs.85）.aspx
推送偏移量消息
呼叫调度消息
jmp消息循环
结束循环：
mov eax，msg.wParam
ret
WinMain endp
；使用开关处理消息（通知）
; https://msdn.microsoft.com/en-us/library/windows/desktop/ms633573（v=vs.85）.aspx
WndProc hWnd:hWnd，uMsg:UINT，wParam:wParam，lParam:lParam
；关闭应用程序
cmp uMsg，WM_销毁
我在毁灭
cmp uMsg，WM_创建
我在创造
cmp uMsg，WM_油漆
我在油漆上
cmp uMsg，WM_LBUTTONDOWN
object db ' ',0
...
ON_WM_PAINT:
...
    mov hFont, eax
    invoke SetBkColor, hdc, 00FF0000h

    push 1
    push offset object
    push hitpoint.y
    push hitpoint.x
    push hdc
    call TextOut
...

push 1
push offset object
push hitpoint.y
push hitpoint.x
push hdc
call TextOut

invoke TextOut, hdc, hitpoint.x, hitpoint.y, offset object, 1

push offset fontName
push DEFAULT_PITCH or FF_DONTCARE
push DEFAULT_QUALITY
push CLIP_DEFAULT_PRECIS
push CLIP_DEFAULT_PRECIS
push DEFAULT_CHARSET
push FALSE
push FALSE
push FALSE
push 700
push 0
push 0
push 18                         ; Width
push 12                         ; Height
call CreateFont
mov font, eax

.386                ; use 80386 instruction
.model flat,stdcall ; uses flat memory addressing model % STDCALL as default calling convention
option casemap:none

include C:\masm32\include\windows.inc
include C:\masm32\include\kernel32.inc
include C:\masm32\include\user32.inc
include C:\masm32\include\gdi32.inc
include C:\masm32\include\masm32.inc

includelib C:\masm32\lib\kernel32.lib   ; ExitProcess, GetCommandLineA, GetModuleHandleA
includelib C:\masm32\lib\user32.lib     ; BeginPaint, CreateWindowExA@, DefWindowProcA, DispatchMessageA, EndPaint, GetMessageA, InvalidateRect, LoadCursorA, LoadIconA, PostQuitMessage, RegisterClassExA, SetWindowTextA, ShowWindow, TranslateMessage, UpdateWindow
includelib C:\masm32\lib\gdi32.lib      ; CreatePen, LineTo, MoveToEx, SelectObject
includelib C:\masm32\lib\masm32.lib     ; dwtoa

.CONST
DRAWING equ 1
WAITING equ 0

.DATA
    ClassName db 'SimpleWinClass',0
    AppName db 'Paint',0

    labelDrawing db 'Drawing...',0
    labelWaiting db 'Waiting.',0

    StaticClassName db 'static',0
    X dw 'x',0
    Y dw 'y',0

    state db WAITING

.DATA?
    hInstance HINSTANCE ?
    CommandLine LPSTR ?
    hitpoint POINT <>
    lastpoint POINT <>

    wc WNDCLASSEX <?>
    msg MSG <?> ; handle message
    hwnd HWND ? ; handle window procedure

    hwndX HWND ?
    hwndY HWND ?
    hwndState HWND ?

    hdc HDC ?
    ps PAINTSTRUCT <?>

    hPen HPEN ?

.CODE

updateXY PROC lParam:LPARAM
    movzx eax, WORD PTR lParam
    mov hitpoint.x, eax

    invoke dwtoa, eax, offset X
    invoke SetWindowText, hwndX, offset X

    mov eax, lParam
    shr eax, 16
    mov hitpoint.y, eax

    invoke dwtoa, eax, offset Y
    invoke SetWindowText, hwndY, offset Y
    ret
updateXY ENDP

; https://msdn.microsoft.com/library/windows/desktop/ms633573.aspx
WndProc PROC hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM

    cmp uMsg, WM_MOUSEMOVE
    je ON_WM_MOUSEMOVE

    cmp uMsg, WM_PAINT
    je ON_WM_PAINT

    cmp uMsg, WM_CREATE
    je ON_WM_CREATE

    cmp uMsg, WM_LBUTTONDOWN
    je ON_WM_LBUTTONDOWN

    cmp uMsg, WM_LBUTTONUP
    je ON_WM_LBUTTONUP

    cmp uMsg, WM_DESTROY
    je ON_WM_DESTROY

    jmp ON_DEFAULT

    ON_WM_DESTROY:              ; User closes program
        invoke PostQuitMessage, NULL
        jmp EXIT

    ON_WM_CREATE:
        ; Create windows for text
        invoke CreateWindowEx, WS_EX_CLIENTEDGE, offset StaticClassName, offset X, WS_CHILD or WS_VISIBLE or WS_BORDER or ES_LEFT, 20, 20, 50, 25, hWnd, 1, hInstance, NULL
        mov hwndX, eax
        invoke CreateWindowEx, WS_EX_CLIENTEDGE, offset StaticClassName, offset Y, WS_CHILD or WS_VISIBLE or WS_BORDER or ES_LEFT, 90, 20, 50, 25, hWnd, 1, hInstance, NULL
        mov hwndY, eax
        invoke CreateWindowEx, WS_EX_CLIENTEDGE, offset StaticClassName, offset labelWaiting, WS_CHILD or WS_VISIBLE or WS_BORDER or ES_LEFT, 20, 60, 80, 23, hWnd, 1, hInstance, NULL
        mov hwndState, eax

        ; Create pen for LineTo
        invoke CreatePen, PS_SOLID, 10, 00FF0000h
        mov hPen, eax

        jmp EXIT

    ON_WM_LBUTTONDOWN:

        ; last mouse position = current mouse position
        mov eax, hitpoint.x
        mov lastpoint.x, eax
        mov eax, hitpoint.y
        mov lastpoint.y, eax

        mov [state], DRAWING
        invoke SetWindowText, hwndState, offset labelDrawing
        jmp EXIT

    ON_WM_LBUTTONUP:
        mov [state], WAITING
        invoke SetWindowText, hwndState, offset labelWaiting
        jmp EXIT

    ON_WM_MOUSEMOVE:
        invoke updateXY, lParam                     ; PROC above

        cmp [state], DRAWING
        jne EXIT

        invoke InvalidateRect, hWnd, NULL, FALSE    ; https://msdn.microsoft.com/library/dd145002.aspx
        jmp EXIT

    ON_WM_PAINT:
        invoke BeginPaint, hWnd, offset ps
        invoke MoveToEx, ps.hdc, lastpoint.x, lastpoint.y, NULL
        invoke SelectObject, ps.hdc, hPen;
        invoke LineTo, ps.hdc, hitpoint.x, hitpoint.y
        mov eax, hitpoint.x             ; last mouse position = current mouse position
        mov lastpoint.x, eax
        mov eax, hitpoint.y
        mov lastpoint.y, eax
        invoke EndPaint, hWnd, offset ps
        jmp EXIT

    ON_DEFAULT:     ; handle any message that program don't handle
        invoke DefWindowProc, hWnd, uMsg, wParam, lParam    ; https://msdn.microsoft.com/library/windows/desktop/ms633572.aspx
        jmp EXIT

    EXIT:
        ret
WndProc ENDP

WinMain PROC hInst:HINSTANCE, hPrevInst:HINSTANCE, CmdLine:LPSTR, CmdShow:DWORD

    ; WNDCLASSEX structure in MSDN, declaration in windows.inc
    ; https://msdn.microsoft.com/library/windows/desktop/ms633577.aspx
    invoke LoadIcon, NULL, IDI_APPLICATION  ; Load default icon
    mov wc.hIcon, eax
    mov wc.hIconSm, eax
    invoke LoadCursor, NULL, IDC_ARROW      ; Load default cursor
    mov wc.hCursor, eax

    mov wc.cbSize, SIZEOF WNDCLASSEX        ; size of this structure
    mov wc.style, CS_HREDRAW or CS_VREDRAW  ; style of windows https://msdn.microsoft.com/library/windows/desktop/ff729176.aspx
    mov wc.lpfnWndProc, OFFSET WndProc      ; andress of window procedure
    mov wc.cbClsExtra, NULL
    mov wc.cbWndExtra, NULL
    push hInstance
    pop wc.hInstance
    mov wc.hbrBackground,COLOR_WINDOW+1     ; background color, require to add 1
    mov wc.lpszMenuName, NULL
    mov wc.lpszClassName, OFFSET ClassName

    invoke RegisterClassEx, offset wc       ; https://msdn.microsoft.com/library/windows/desktop/ms633587.aspx

    ; https://msdn.microsoft.com/library/windows/desktop/ms632680.aspx
    invoke CreateWindowEx, WS_EX_CLIENTEDGE, offset ClassName, offset AppName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 600, 600, NULL, NULL, hInstance, NULL
    mov hwnd, eax                       ; Store windows handle
    invoke ShowWindow, hwnd, CmdShow    ; https://msdn.microsoft.com/library/windows/desktop/ms633548.aspx
    invoke UpdateWindow, hwnd           ; https://msdn.microsoft.com/library/windows/desktop/dd145167.aspx

    ; Message Loop
    MESSAGE_LOOP:                       ; https://msdn.microsoft.com/library/windows/desktop/ms644936.aspx

        invoke GetMessage, offset msg, NULL, 0, 0
        test eax, eax
        jle END_LOOP

        invoke TranslateMessage, offset msg
        invoke DispatchMessage, offset msg

        jmp MESSAGE_LOOP

    END_LOOP:
    mov eax, msg.wParam
    ret
WinMain ENDP

main PROC

    invoke GetModuleHandle, NULL    ; https://msdn.microsoft.com/library/windows/desktop/ms683199.aspx
    mov hInstance, eax              ; return an instance to handle in eax

    invoke GetCommandLine           ; https://msdn.microsoft.com/library/windows/desktop/ms683156.aspx
    mov CommandLine, eax            ; return a pointer to the command-line for current process

    invoke WinMain, hInstance, NULL, CommandLine, SW_SHOW

    invoke ExitProcess, eax
main ENDP

END main