Author Topic: read txt file , help please  (Read 423 times)

jangogrand

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read txt file , help please
« on: August 14, 2017, 10:11:16 AM »
hello i try to read a text file a place the data in a buffer
1) i use CreateFile to get the  handle of the file
2)i use GetFileSizeEx to get the file size it worked with success
3) i use ReadFile but it not give a error or a success return it crash

that is the code

.386
.model flat, stdcall
option casemap:none
includelib C:\masm32\lib\kernel32.lib
includelib C:\masm32\lib\user32.lib
includelib C:\masm32\lib\msvcrt.lib
include C:\masm32\include\kernel32.inc  ;cotient les prototype des function
include C:\masm32\include\user32.inc
include C:\masm32\include\windows.inc
printf PROTO C :ptr, :vararg
.data

kolo db "C:\Documents and Settings\servername\Bureau\t.txt",0
ggg dd 0
hhd dd 0
hhd2 dd 0
buff db 2600 DUP (0)
messageId DWORD ?
pErrorMsg DWORD ?
format db 'result: %s',13,10,0
format2 db 'result: %x',13,10,0
format3 db 'result: %d',13,10,0
.code
Main:
invoke CreateFile, OFFSET kolo, GENERIC_READ or GENERIC_WRITE, \
                 FILE_SHARE_READ or FILE_SHARE_WRITE,\
           NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL
mov hhd,eax
mov hhd2,eax

invoke GetFileSizeEx, hhd, OFFSET ggg

invoke ReadFile, hhd2, OFFSET buff, ggg, NULL, NULL
INVOKE printf, addr format3, eax
call GetLastError
mov messageId,eax
INVOKE FormatMessage, FORMAT_MESSAGE_ALLOCATE_BUFFER + \
 FORMAT_MESSAGE_FROM_SYSTEM, NULL, messageId, 0,
 ADDR pErrorMsg, 0, NULL


INVOKE printf, addr format, pErrorMsg
INVOKE printf, addr format2, messageId
INVOKE LocalFree, pErrorMsg

end Main

thank you

hutch--

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Re: read txt file , help please
« Reply #1 on: August 14, 2017, 10:54:43 AM »
jango,

Put it all in a ZIP file so that anyone who has the time can see what is happening with your code.
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jangogrand

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Re: read txt file , help please
« Reply #2 on: August 14, 2017, 12:15:47 PM »
ok that is the file

hutch--

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Re: read txt file , help please
« Reply #3 on: August 14, 2017, 02:02:25 PM »
jango,

Apologies that I did not have time to fix the test piece but here is a simple working example using the high level part of MASM32. Its useful in that it gets the logic right. You can manually code the API calls to do the same.

    include \masm32\include\masm32rt.inc

  .data?
    hFile dd ?
    flen dd ?
    bRed dd ?
    pMem dd ?

  .code

  Main:

    mov hFile, fopen("t.txt")               ; open the file
    mov flen,  fsize(hFile)                 ; get its length
    mov pMem,  alloc(flen)                  ; allocate memory
    mov bRed,  fread(hFile,pMem,flen)       ; read file into buffer

    print pMem,13,10                        ; display file content

    fclose hFile                            ; close the file
    free pMem                               ; release the allocated memory
    invoke ExitProcess,0                    ; terminate the process

  end Main
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nidud

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Re: read txt file , help please
« Reply #4 on: August 14, 2017, 10:43:11 PM »

 :biggrin:

Quote
My advises;

1) Watch out for the drivers of ignorance on this board. Some pretend to be the master of driving but don't even know the inner workings of a carburettor.
2) Start with smaller engines and slowly progress with more pistons as you gain familiarity.
3) Driving are not for beginners. They are either for the ones who already appreciated whats under the hood and/or for the clueless retards to keep 'driving' for unknown purposes. There are logical reasons why Microsoft dropped the wheel completely in their 64-bit ABI.

hutch--

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Re: read txt file , help please
« Reply #5 on: August 14, 2017, 10:55:12 PM »
Ignore the nonsense jango, here is the mnemonic version of the high level code I posted earlier.

; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤
    include \masm32\include\masm32rt.inc
; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

comment * -----------------------------------------------------
                     Build this console app with
                  "MAKEIT.BAT" on the PROJECT menu.
        ----------------------------------------------------- *

    .data
      fnam db "t.txt",0
      crlf db 13,10,0

    .code

start:
   
; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

    call main

    inkey

    push 0
    call ExitProcess

; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

main proc

    LOCAL bcnt  :DWORD
    LOCAL bwrd  :DWORD
    LOCAL hFile :DWORD
    LOCAL pMem  :DWORD

    push 0
    push FILE_ATTRIBUTE_NORMAL
    push OPEN_EXISTING
    push 0
    push 0
    push GENERIC_READ or GENERIC_WRITE
    push OFFSET fnam
    call CreateFile
    mov hFile, eax

    push 0
    push hFile
    call GetFileSize
    mov bcnt, eax

    push bcnt
    push GMEM_FIXED or GMEM_ZEROINIT
    call GlobalAlloc
    mov pMem, eax

    push 0
    lea eax, bwrd
    push eax
    push bcnt
    push pMem
    push hFile
    call ReadFile

    push pMem
    call StdOut
    push OFFSET crlf
    call StdOut

    push pMem
    call GlobalFree

    push hFile
    call CloseHandle

    ret

main endp

; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

end start
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aw27

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Re: read txt file , help please
« Reply #6 on: August 14, 2017, 11:14:30 PM »
Very nice, Hutch.
But you had no need to remove the solution I presented many hours ago.
jangogrand is not dumb.

hutch--

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Re: read txt file , help please
« Reply #7 on: August 14, 2017, 11:22:51 PM »
Simple Jose,

I removed all of the bullsh*t in one go. This is a new member who is subject to the protection of this forum and did not need his question thread full of invective and smart arse comments.
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aw27

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Re: read txt file , help please
« Reply #8 on: August 14, 2017, 11:45:05 PM »
I know you are the boss here and you are making it clear to everybody.
But come on Hutch, your example is not what I would call a didactic example.
« Last Edit: August 15, 2017, 01:36:30 AM by aw27 »

hutch--

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Re: read txt file , help please
« Reply #9 on: August 14, 2017, 11:51:10 PM »
Jose,

While this thread is not the venue for debate, does a new member learning assembler need a "didactic example" ? I could code it in direct opcodes but would it be of any greater use ? I did the high level version earlier today when I was busy but it has the advantage of being easy to follow to get the logic of the API calls. The later version is how to code it in bare mnemonics.

What I don't want is for new members to have to wade through a mountain of invective and bullsh*t, new members are protected here to ensure this does not happen.
hutch at movsd dot com
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aw27

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Re: read txt file , help please
« Reply #10 on: August 14, 2017, 11:58:15 PM »
What I don't want is for new members to have to wade through a mountain of invective and bullsh*t, new members are protected here to ensure this does not happen.

All right, I understand it is some sort of Witness Protection Program.

jangogrand

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Re: read txt file , help please
« Reply #11 on: August 15, 2017, 12:25:04 AM »
sorry i was not online to see what aw27 have post ,  hutch--  thank you so much    :t
 hutch--  can you please let me see the solution of aw27

hutch--

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Re: read txt file , help please
« Reply #12 on: August 15, 2017, 12:39:44 AM »
jango,

Just ask AW to repost them as I deleted all of the stuff that was argumentative.
hutch at movsd dot com
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TWell

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Re: read txt file , help please
« Reply #13 on: August 15, 2017, 12:42:17 AM »
There was couple things to correct.
 - GetFileSizeEx overwrites hhd
 - ReadFile needs 4. DWORD parameter for read count, otherwise it could crash
 - you can't read more than buffer size from file.
 - ExitProcess at end
Code: [Select]
.386
.model flat, stdcall
option casemap:none

includelib kernel32.lib
ExitProcess PROTO :DWORD
CreateFileA PROTO :ptr,:DWORD,:DWORD,:ptr,:DWORD,:DWORD,:ptr
GetFileSizeEx PROTO :ptr,:ptr
ReadFile PROTO :ptr,:ptr,:DWORD,:ptr,:ptr
GetLastError PROTO
FormatMessageA PROTO :DWORD,:ptr,:DWORD,:DWORD,:ptr,:DWORD,:ptr
LocalFree PROTO :ptr
GENERIC_WRITE equ 40000000h
GENERIC_READ equ 80000000h
FILE_SHARE_READ equ 1
FILE_SHARE_WRITE equ 2
OPEN_EXISTING equ 3
FILE_ATTRIBUTE_NORMAL equ 00000080h
FORMAT_MESSAGE_ALLOCATE_BUFFER equ 00000100h
FORMAT_MESSAGE_FROM_SYSTEM equ 00001000h
NULL equ 0

includelib msvcrt.lib
printf PROTO C :ptr, :vararg

.data
fname db "test1.asm",0
fsl dd ? ; lodword size
fsh dd ? ; hidword size
rd  dd ? 
hf  dd ?
buff db 2600 DUP (?)
messageId DWORD ?
pErrorMsg DWORD ?
format db 'result: %s',13,10,0
format2 db 'result: %x',13,10,0
format3 db 'result: %d',13,10,0
.code
Main:

mainCRTStartup proc
invoke CreateFileA, OFFSET fname, GENERIC_READ or GENERIC_WRITE, \
                 FILE_SHARE_READ or FILE_SHARE_WRITE,\
           NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL
mov hf,eax
invoke GetFileSizeEx, hf, OFFSET fsl

invoke ReadFile, hf, OFFSET buff, SIZEOF buff, OFFSET rd, NULL
invoke printf, addr format3, eax
call GetLastError
mov messageId,eax
INVOKE FormatMessageA, FORMAT_MESSAGE_ALLOCATE_BUFFER + \
  FORMAT_MESSAGE_FROM_SYSTEM, NULL, messageId, 0,
  ADDR pErrorMsg, 0, NULL

INVOKE printf, addr format, pErrorMsg
INVOKE printf, addr format2, messageId
INVOKE LocalFree, pErrorMsg
INVOKE ExitProcess,0
mainCRTStartup endp
end Main

aw27

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Re: read txt file , help please
« Reply #14 on: August 15, 2017, 01:07:09 AM »
can you please let me see the solution of aw27
jangogrand,

What I said was actually what TWell is saying, except that he adds that the buffer might not be enough for the file which I agree.
@Thank you TWell.