Отладка работы функции ReadFile для обработки bmp изображений

.586
.model flat, stdcall
option casemap: none
 
    include \masm32\include\windows.inc
    include \masm32\include\kernel32.inc
    include \masm32\include\user32.inc
    include \masm32\include\comdlg32.inc
 
    includelib \masm32\lib\kernel32.lib
    includelib \masm32\lib\user32.lib
    includelib \masm32\lib\comdlg32.lib
 
    CommonDialogs PROTO :DWORD, :DWORD, :DWORD, :DWORD
    FileOpenDialog PROTO :DWORD
    FileSaveDialog PROTO :DWORD
 
.data
 
    dlgname db "COMMONDIALOGS", 0
    TextErrorOpenFile db "Ошибка открытия файла", 0
    TextErrorReadFile db "Ошибка чтения файла", 0
    NumberOfBytesToRead dw 250
    NumberOfBytesRead dw -1
    Buffer db 256 dup (0)
    ; -----------------------------------
    ; Used by open & save file dialogs
    ; -----------------------------------
    szFile        db "*.*", 256 dup (0)     
    strFilter     db "All Files", 0
    ; -----------------------------------
    ; Required structures used by dialogs
    ; -----------------------------------
    ofn OPENFILENAME <>
    os OFSTRUCT <>
    bfh BITMAPFILEHEADER <>
 
.data?
 
    hInstance HINSTANCE ?
    CommandLine LPSTR ?
    hFile HFILE ?
 
.const
 
    IDC_EXIT equ 0
    IDC_BUTTONOPEN equ 1
    IDC_BUTTONSAVE equ 2
 
.code
 
start:
    invoke GetModuleHandle, NULL
    mov hInstance, eax
    ; --------------------------------------------
    ; Call the dialog box stored in resource file.
    ; --------------------------------------------
    invoke DialogBoxParam,hInstance,ADDR dlgname,0,ADDR CommonDialogs,0
    invoke ExitProcess, eax
 
    CommonDialogs proc hWin:DWORD,uMsg:DWORD,wParam:DWORD,lParam:DWORD
    
        .IF uMsg == WM_INITDIALOG
 
        .ELSEIF uMsg == WM_COMMAND
                mov eax,wParam
                .IF eax == IDC_BUTTONOPEN
                    invoke FileOpenDialog, hWin
                    .IF eax!=0
                        invoke OpenFile, ofn.lpstrFile, addr os, OF_READWRITE
                        mov hFile, eax
                        .IF eax==-1
                            invoke MessageBox, hWin, addr TextErrorOpenFile, NULL, MB_OK
                        .ELSE
                            invoke ReadFile, hFile, addr Buffer, NumberOfBytesToRead, addr NumberOfBytesRead, NULL
                            ;.IF eax==0
                            ;    invoke MessageBox, hWin, addr TextErrorReadFile, NULL, MB_OK
                            ;.ELSE
                            ;    mov ax, word ptr Buffer
                            ;    mov bfh.bfType, ax
                            ;    mov eax, dword ptr Buffer+2
                            ;    mov bfh.bfSize, eax
                            ;.ENDIF
                            invoke CloseHandle, hFile
                        .ENDIF
                    .ENDIF
                .ELSEIF eax == IDC_BUTTONSAVE
                    invoke FileSaveDialog, hWin
                .ELSEIF eax == IDC_EXIT
                    invoke SendMessage, hWin, WM_CLOSE, 0, 0
                .ENDIF
        .ELSEIF uMsg == WM_CLOSE
            invoke EndDialog,hWin,0
        .ENDIF
        xor eax,eax
        ret
    
    CommonDialogs endp
 
    FileOpenDialog proc hwnd:DWORD
 
        ; --------------------------------------
        ; Initialize the OPENFILENAME structure.
        ; --------------------------------------
        invoke RtlZeroMemory,ADDR ofn,SIZEOF ofn
        mov ofn.lStructSize,SIZEOF ofn
        mov eax,hwnd
        mov ofn.hwndOwner,eax
        mov eax,OFFSET szFile
        mov ofn.lpstrFile,eax
        mov ofn.nMaxFile,SIZEOF szFile
        mov eax,OFFSET strFilter
        mov ofn.lpstrFilter,eax
        mov ofn.nFilterIndex,1
        mov ofn.lpstrFileTitle,0
        mov ofn.nMaxFileTitle,0
        mov ofn.lpstrInitialDir,0
        mov ofn.Flags,OFN_PATHMUSTEXIST
        ; -----------------------------------------
        ; Call the File Open Common Control dialog.
        ; -----------------------------------------
        invoke GetOpenFileName,ADDR ofn 
        ; -------------------------------------------------------
        ; If user picks a file name and clicks the OK button the
        ; return value is NONZERO. The buffer pointed to by the
        ; lpstrFile member contains the full path and file name
        ; choosen. If Cancel or [X] is clicked or an error occurs
        ; the return value is ZERO.
        ; -------------------------------------------------------
        ret
 
    FileOpenDialog endp
 
    FileSaveDialog proc hwnd:DWORD
 
        ; --------------------------------------
        ; Initialize the OPENFILENAME structure.
        ; --------------------------------------
        invoke RtlZeroMemory,ADDR ofn,SIZEOF ofn
        mov ofn.lStructSize,SIZEOF ofn
        mov eax,hwnd
        mov ofn.hwndOwner,eax
        mov eax,OFFSET szFile
        mov ofn.lpstrFile,eax
        mov ofn.nMaxFile,SIZEOF szFile
        mov eax,OFFSET strFilter
        mov ofn.lpstrFilter,eax
        mov ofn.nFilterIndex,1
        mov ofn.lpstrFileTitle,0
        mov ofn.nMaxFileTitle,0
        mov ofn.lpstrInitialDir,0
        mov ofn.Flags,OFN_PATHMUSTEXIST
        ; -----------------------------------------
        ; Call the File Save Common Control dialog.
        ; -----------------------------------------
        invoke GetSaveFileName,ADDR ofn 
        ; -----------------------------------------------------------
        ; If the user specifies a file name and clicks the OK button
        ; and the function is successful the return value is NONZERO.
        ; The buffer pointed to by the lpstrFile member contains the
        ; full path and file name specified by the user. If Cancel or
        ; [X] is clicked or an error occurs the return value is ZERO.
        ; -----------------------------------------------------------
        ret
 
    FileSaveDialog endp
    
end start

#include "\masm32\include\resource.h"
#define IDC_EXIT 0
#define IDC_BUTTONOPEN 1
#define IDC_BUTTONSAVE 2
 
COMMONDIALOGS DIALOG DISCARDABLE  0, 0, 287, 180
STYLE DS_MODALFRAME | DS_CENTER | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Fingerprinting"
FONT 8, "MS Sans Serif"
{
    PUSHBUTTON "File Open Dialog", IDC_BUTTONOPEN, 14, 55, 121, 14
    PUSHBUTTON "File Save Dialog", IDC_BUTTONSAVE, 14, 74, 121, 14
    PUSHBUTTON "Exit", IDC_EXIT, 224, 146, 50, 24
}