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Assuming my edit box had the message as follow:

      1.Hello,baby
      2.I like linkin park

i want to add :"3.I am from china",
i had tried this:
   
    invoke SendMessage,hwndEdit,EM_REPLACESEL,0,addr szText          ;szText db "3.I am from china",13,10,0



but the result just as follow:
              3.I am from china
              1.Hello,baby
              2.I like linkin park




how can i add the message after "2.I like linkin park" ?

The idea is to use the EM_SETSEL message to deselect everything and then set caret position to the end of text.
Try something like this:

invoke SendMessage,hwndEdit,EM_SETSEL, -1, -1
invoke SendMessage,hwndEdit,EM_REPLACESEL,0,addr szText

Regards.

Kecol.-

PS: read some documentation if it doesn't work (MSDN).

Hey, you didn't check the API documentation. The idea was good but I made a mistake in the code.
This will work:

invoke SendMessage,hwndEdit,EM_SETSEL, -1, 0
invoke SendMessage,hwndEdit,EM_REPLACESEL,0,addr szText

Search the forum before asking. I will do the same before answering.

Kecol.-

i have tested the edit`control undo queue,it return false?why?

my program as follow:


.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 "Kernel Tools",0
MenuName db "&Function",0
MenuName1 db "&Edit",0
submenu1 db "&Kernel/PE Addr",0
submenu2 db "&Clear",0
submenu3 db "E&xit",0
submenu4 db "&Undo",0
outformat db "Base address of kernel:0x%XH",13,10
          db "Address of PE header  :0x%XH",0
try db "Haha,you make it!",13,10,0
EditClassName db "edit",0
szWarning db "Failure.:(",0


.data?
hInstance HINSTANCE ?
CommandLine LPSTR ?
hwndMenu DWORD ?
hwndEdit HWND ?
buffer db 1024 dup(?)               

.const
                             
                               
IDM_ADDRESS equ 1
IDM_CLEAR equ 2

IDM_EXIT equ 3
IDM_UNDO equ 4

.code
start:
    mov eax,
    .while word ptr !="ZM"
    dec eax
    .endw
    mov edx,
    add edx,eax
    invoke wsprintf,addr buffer,addr outformat,eax,edx
    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_BTNFACE+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 CreateMenu
    mov hwndMenu,eax
    invoke CreatePopupMenu
    mov esi,eax
    invoke AppendMenu,hwndMenu,MF_POPUP,esi,addr MenuName
    invoke AppendMenu,esi,MF_STRING,IDM_ADDRESS,addr submenu1
    invoke AppendMenu,esi,MF_STRING,IDM_CLEAR,addr submenu2
    invoke AppendMenu,esi,MF_STRING,IDM_UNDO,addr submenu4
    invoke AppendMenu,esi,MF_SEPARATOR,NULL,NULL
    invoke AppendMenu,esi,MF_STRING,IDM_EXIT,addr submenu3
 
    invoke CreateWindowEx,WS_EX_CLIENTEDGE,ADDR ClassName, \
                        ADDR AppName, WS_OVERLAPPED,\
                      360, 280,\
                      400,300,NULL,hwndMenu, 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 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
    .IF uMsg==WM_DESTROY
        invoke PostQuitMessage,NULL
    .ELSEIF uMsg==WM_CREATE
        invoke CreateWindowEx,WS_EX_CLIENTEDGE, ADDR EditClassName,NULL,\
                        WS_CHILD or WS_VISIBLE or WS_BORDER or WS_VSCROLL or ES_LEFT or\
                        ES_READONLY or ES_MULTILINE or ES_AUTOVSCROLL,\
                        15,25,360,150,hWnd,8,hInstance,NULL
        mov  hwndEdit,eax
            invoke EnableMenuItem,hwndMenu,IDM_CLEAR,MF_GRAYED
            .ELSEIF uMsg==WM_COMMAND
        mov eax,wParam
        .IF lParam==0
            .IF ax==IDM_ADDRESS
              invoke EnableMenuItem,hwndMenu,IDM_ADDRESS,MF_GRAYED
              invoke EnableMenuItem,hwndMenu,IDM_CLEAR,MF_ENABLED
              invoke SetWindowText,hwndEdit,addr buffer
              ;invoke SendMessage,hwndEdit,EM_SETSEL,0,-1             
              invoke SendMessage,hwndEdit,EM_REPLACESEL,0,addr try           
            .ELSEIF ax==IDM_CLEAR
                invoke SetWindowText,hwndEdit,NULL
                invoke EnableMenuItem,hwndMenu,IDM_ADDRESS,MF_ENABLED
                invoke EnableMenuItem,hwndMenu,IDM_CLEAR,MF_GRAYED
            .ELSEIF ax==IDM_UNDO
                invoke SendMessage,hwndEdit,EM_CANUNDO,0,0
                .if eax!=0
                invoke SendMessage,hwndEdit,EM_UNDO,0,0
                .else
                invoke MessageBox,NULL,addr szWarning,addr AppName,MB_ICONERROR
                .endif
            .ELSE
                invoke DestroyWindow,hWnd
            .ENDIF
                 
         
        .ENDIF
    .ELSE
        invoke DefWindowProc,hWnd,uMsg,wParam,lParam
        ret
    .ENDIF
    xor    eax,eax
    ret
WndProc endp
end start




who can help me to solve the problem?