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I have written a small text editor based RichEdit control (see text below). Program can open and save any file but when I open some large file (size > 32K) I can't insert into the text any symbol (but can delete and replace text!). May be somebody know what I am doing wrong and what's my problem? Thanks, Mike. **************** The beginning of RichEdit.asm ********************************* .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 include \masm32\include\gdi32.inc include \masm32\include\comdlg32.inc includelib \masm32\lib\user32.lib includelib \masm32\lib\kernel32.lib includelib \masm32\lib\gdi32.lib includelib \masm32\lib\comdlg32.lib EditML PROTO :DWORD,:DWORD,:DWORD,:DWORD,:DWORD,:DWORD,:DWORD,:DWORD .const IDM_OPEN equ 1 IDM_SAVE equ 2 IDM_EXIT equ 9 MAXSIZE equ 260 MEMSIZE equ 65535 EditID equ 1 CFM_BACKCOLOR equ 04000000h .data ClassName db "Win32ASMEditClass",0 AppName db "Small Text Editor",0 EditClass db "edit",0 MenuName db "FirstMenu",0 ofn OPENFILENAME <> FilterString db "All files",0,"*.*",0 db "Text files",0,"*.txt",0,0 buffer db MAXSIZE dup(0) bytesread dd 0 .data? hInstance HINSTANCE ? CommandLine LPSTR ? hREdit HWND ? hFile HANDLE ? hMemory HANDLE ? pMemory DWORD ? SizeReadWrite DWORD ? EditS EDITSTREAM cf CHARFORMAT2 <> .code start: invoke GetModuleHandle, NULL mov hInstance,eax invoke GetCommandLine 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,\ 100,100,600,400,\ 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 TranslateMessage, ADDR msg INVOKE DispatchMessage, ADDR msg .ENDW mov eax,msg.wParam ret WinMain endp WndProc proc uses ebx hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM .IF uMsg==WM_CREATE invoke EditML,NULL,0,30,300,200,hWnd,700,0 mov hREdit, eax invoke SetFocus,hREdit mov ofn.lStructSize,SIZEOF ofn push hWnd pop ofn.hwndOwner push hInstance pop ofn.hInstance mov ofn.lpstrFilter, OFFSET FilterString mov ofn.lpstrFile, OFFSET buffer mov ofn.nMaxFile,MAXSIZE .ELSEIF uMsg==WM_SIZE mov eax,lParam mov edx,eax shr edx,16 and eax,0ffffh invoke MoveWindow,hREdit,0,0,eax,edx,TRUE .ELSEIF uMsg==WM_DESTROY invoke PostQuitMessage,NULL .ELSEIF uMsg==WM_COMMAND mov eax,wParam .if lParam==0 .if ax==IDM_OPEN call OpenF .elseif ax==IDM_SAVE call SaveF .else invoke DestroyWindow, hWnd .endif .endif .ELSE invoke DefWindowProc,hWnd,uMsg,wParam,lParam ret .ENDIF xor eax,eax ret WndProc endp EditML proc szMsg:DWORD,tx:DWORD,ty:DWORD,wd:DWORD,ht:DWORD, hParent:DWORD,ID:DWORD,Wrap:DWORD LOCAL hCtl :DWORD LOCAL hFnt :DWORD LOCAL eStyle :DWORD jmp @F richedit db 'RICHEDIT',0 RichEdDLL db 'RICHED

Hi, be careful with the maximum size, there are some riched20.dll versions, which are limited to 1MByte size. The INFINITE constant described in some documentation doesnt work with all dll versions. beaster.