簡單取得BMP長寬

BMP的讀取32Bit 的值 找了許久..
以下是程式碼，請參考

bool GetBmpWidthHeight(const wxChar* buf,int size,int&Width,int& Height,bool& ReadWidthHeight)
{
  if(size < 26)
  {
    ReadWidthHeight = false;
    return false;
  }

  width =(BYTE)buf[21] << 24;
  height =(BYTE)buf[25] << 16;
  readwidthheight=true;
}

以上 ， 不負責讀取所有格式，另有問題概不負責.
歡迎轉載並請標明出處.謝謝

參考：

http://www.google.com/codesearch?hl=en&q=+lang:c%2B%2B+read+bmp+width+-img+show:MSwKpY23o4k:RjXxUM8aNXA:UKPc_fAe5nA&sa=N&cd=2&ct=rc&cs_p=ftp://ftp.idsoftware.com/idstuff/source/GtkRadiant-GPL.zip&cs_f=GPL/GtkRadiant/plugins/image/bmp.cpp#a0

http://www.google.com/codesearch?hl=zh-TW&q=+lang:c%2B%2B+read+bmp+width+%3C%3C+-img+show:aqffVhSjOiA:HMWZi5kbbPk:khnt1EYmZBw&sa=N&cd=6&ct=rc&cs_p=http://gentoo.osuosl.org/distfiles/BillardGL-1.75.tar.gz&cs_f=BillardGL-1.75/src/bmp.cpp#a0

http://www.google.com/codesearch?hl=en&q=+lang:c%2B%2B+read+bmp+width+-img+show:yCojKnsQ0QI:vtUCdjQhxbA:q2dpa3bwE18&sa=N&cd=10&ct=rc&cs_p=http://www-ftp.lip6.fr/pub/X11/kde/stable/latest/src/kdegraphics-3.5.6.tar.bz2&cs_f=kdegraphics-3.5.6/kfile-plugins/bmp/kfile_bmp.cpp#a0