X-Received: by 10.224.36.66 with SMTP id s2mr7680210qad.6.1367256050258; Mon, 29 Apr 2013 10:20:50 -0700 (PDT)
X-Received: by 10.50.196.227 with SMTP id ip3mr375676igc.10.1367256050217; Mon, 29 Apr 2013 10:20:50 -0700 (PDT)
Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!s14no833509qam.0!news-out.google.com!ef9ni28916qab.0!nntp.google.com!s14no847391qam.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.python
Date: Mon, 29 Apr 2013 10:20:49 -0700 (PDT)
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=114.218.8.106; posting-account=YNiTnAoAAACsQcku3BuAy8Lv9lS0qShZ
NNTP-Posting-Host: 114.218.8.106
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <aee818ca-e077-4e52-be55-7b8282684ba4@googlegroups.com>
Subject: Can read in the BMP data correctly ,but the size is not right?
From: Jimmie He <jimmie.he@gmail.com>
Injection-Date: Mon, 29 Apr 2013 17:20:50 +0000
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Xref: csiph.com comp.lang.python:44509

   I'm trying to read in the BMP data by the the code below,and I'm check t=
he data array with WINHEX,and it is correct,but which confuse me is why the=
 size is 0x180,but the actual picture should be 48*48 =3D 0x120 bytes becau=
se I use 1-bit BMP not the 24bit BMP,could any one give some hints?


---------------------------------------------------------------------------=
-----
__Head_Info =3D [
            [ 'Type'         ,0 , 2],#BM
            [ 'FSize'        ,2 , 4],#File Size
            [ 'Reserved'     ,6 , 4],#0x00000000
            [ 'OffBits'      ,10 , 4],#Offset of Image
            [ 'SSize'        ,14 , 4],# 40
            [ 'Width'        ,18 , 4],#Width
            [ 'Height'       ,22 , 4],#Hight
            [ 'Planes'       ,26 , 2],#1
            [ 'BitCount'     ,28 , 2],#{1,2,4,8,24}
            [ 'Compress'     ,30 , 4],#0
            [ 'SizeImage'    ,34 , 4],#Bytes Per Line
            [ 'XPM'          ,38 , 4],#2835
            [ 'YPM'          ,42 , 4],#2835
            [ 'ClrUsed'      ,46 , 4],#0
            [ 'ClrImportant' ,50 , 4]#0
            ]
_Type          =3D0;
_FSize         =3D1;
_Reserved      =3D2;
_OffBits       =3D3;
_SSize         =3D4;
_Width         =3D5;
_Height        =3D6;
_Planes        =3D7;
_BitCount      =3D8;
_Compress      =3D9;
_SizeImage     =3D10;
_XPM           =3D11;
_YPM           =3D12;
_ClrUsed       =3D13;
_ClrImportant =3D14;

def __getInt( b, idx):
    return binToInt(b,__Head_Info[idx][1],__Head_Info[idx][2])

def saveMatrixtoASC(bmpfilename,ascfilename):
    try:
        handle1=3Dopen( bmpfilename ,"rb")
        raw =3D bytearray(handle1.read( ))
        handle1.close
    except Exception as E:
        return "error:"+ str(E),""
   =20
    datastart=3D__getInt(raw, _OffBits)
    datasize =3D__getInt(raw, _SizeImage)
    print ('Image Offset =3D 0x%X'%datastart)
    print ('Image Size   =3D 0x%X'%datasize)
    handle2=3Dopen( ascfilename ,"w")
    for i in range(0,datasize):
       handle2.write('0x%02X,'%raw[datastart+i])
       if (i+1) % 16 =3D=3D 0 :
          handle2.write("\n")
    handle2.close