Question

extern GetModuleHandleA
extern LoadCursorA
extern RegisterClassA
extern CreateWindowExA
extern GetMessageA
extern DispatchMessageA
extern TranslateMessage
extern ExitProcess
extern PostQuitMessage
extern DefWindowProcA

section .data

MSG      dq 0         ;+0 hWnd
dd 0         ;+8 message
dd 0         ;padding for next
wParam dq 0         ;+10 wParam
dq 0         ;+18 lParam
dd 0         ;+20 time
dd 0         ;+24 1st part of point structure
dd 0         ;+28 2nd part of point structure
dd 0         ;padding to bring total size to 48 bytes

WNDCLASS dd 1h+2h+40h ;+0 window class style (CS_VREDRAW+CS_HREDRAW+CS_CLASSDC)
dd 0         ;padding for next
dq WndProcTable       ;+8 pointer to Window Procedure
dd 0         ;+10 no. of extra bytes to allocate after structure
dd 0         ;+14 no. of extra bytes to allocate after window instance
hInst dq 0         ;+18 handle to instance containing window procedure
dq 0         ;+20 handle to the class icon
hCursor dq 0         ;+28 handle to the class cursor
dq 6         ;+30 identifies the class background brush (6=COLOR_WINDOW+1)
dq 0         ;+38 pointer to resource name for class menu
dq win_class_name   ;+40 pointer to string for window class name

win_class_name db 'simplewindow',0     ;string holding name of window class
win_id dq 0  
but_id dq 0
kopf db '64 bit program', 0
class_button db 'button', 0
button_kopf db 'hjh', 0

mbt db 'this is only a test', 0
mbc db 'achtung', 0

section .text

global  start
start:  
sub rsp, 0x8
xor rcx, rcx
call  GetModuleHandleA
mov [hInst], rax
mov rcx, 0
mov rdx, 32512
call LoadCursorA
mov [hCursor], rax  
mov rcx,  WNDCLASS
sub rsp, 0x20
call RegisterClassA
add rsp, 0x20

;creating main window
mov rcx, 0
mov rdx, win_class_name
mov r8, kopf
mov r9, 0x10000000+0x00080000+0x00020000
push 0
push qword[hInst]
push 0
push 0
push 512
push 512
push 256
push 256
sub rsp, 0x20
call CreateWindowExA
add rsp, 0x20
add rsp, 0x40
mov [win_id], rax  

zyklus:
mov rcx, MSG
mov rdx, 0
mov r8, 0
mov r9, 0
sub rsp, 20h  
call GetMessageA
add rsp, 20h
or rax, rax
jz fertig
mov rcx, MSG 
call TranslateMessage  
mov rcx, MSG   
call DispatchMessageA  
jmp zyklus

fertig:
mov rcx,  [wParam]
call ExitProcess

WndProcTable:  
sub rsp, 0x8
cmp edx, 0x01  ; see if it is wm_create  message
jne quit              

; creating button

mov rcx, 0
mov rdx, class_button
mov r8, button_kopf
mov r9, 0x40000000+0x10000000  ; child +visible
push 0
push qword[hInst]
push 0
push qword[win_id]
push 20
push 50
push 30
push 30
sub rsp, 0x20
call CreateWindowExA
add rsp, 0x20
add rsp, 0x40
mov [but_id], rax        
jmp alles

quit:
cmp edx, 0x02
jne weiter

xor rcx, rcx
call PostQuitMessage
weiter:
sub rsp,20h            
call DefWindowProcA
add rsp,20h             

alles:
add rsp, 0x8

ret

但是如果在创建主窗口代码后放置创建按钮代码一切正常，但在处理wm_create mrssage时失败了

nasm -f win64 first.nasm -o first，obj 首先是golink，obj user32.dll kernel32.dll gdi32.dll

按钮不会出现或根本不会创建怎么了？我想知道这段代码出了什么问题是否有人注意到此代码中的任何错误我不知道在哪里可以找到错误

现在它已经解决了。 wm_create有效句柄在rcx寄存器中后，主窗口句柄在创建按钮时无效（它在wndproctable中作为第一个参数传递）所以右边是push rcx

Answer 1

现在它已经解决了。 wm_create有效句柄在rcx寄存器中后，主窗口句柄在创建按钮时无效（它在wndproctable中作为第一个参数传递）所以右边是push rcx

谁真正知道为什么子窗口（按钮）没有创建或者在wm_create消息后可能看不到

1 个答案: