c - Win32 API - Trying to readfile, it's getting truncated -- why? -

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i trying read file , display file in ascii or hex hedit. running other computations on file info right want see all.

currently code displays first bit - "mz" - thats it. somehow accidentally truncating pszfiletext variable, want able view entire executable in window.

bool readinexefile(hwnd hedit, lpctstr pszfilename) { handle hfile; bool bsuccess = false;  hfile = createfile(pszfilename, generic_read, file_share_read, null,     open_existing, 0, null); if(hfile != invalid_handle_value) {     dword dwfilesize;      dwfilesize = getfilesize(hfile, null);     if(dwfilesize != 0xffffffff)     {         lpstr pszfiletext;          pszfiletext = globalalloc(gptr, dwfilesize + 1);         if(pszfiletext != null)         {             dword dwread;             if(readfile(hfile, pszfiletext, dwfilesize, &dwread, null))             {                 pszfiletext[dwfilesize] = 0; // add null terminator                 if(setwindowtext(hedit, pszfiletext))                 {                     bsuccess = true; // worked!                 }             }             globalfree(pszfiletext);         }     }     closehandle(hfile); } return bsuccess;

}

exe files binary, you trying display raw binary data as-is, not work. on right track thinking need encode binary data hex before displaying it. binary data not displayable, hex is.

try instead:

static const tchar hex[] = text("0123456789abcdef");  bool readinexefile(hwnd hedit, lpctstr pszfilename)  {      bool bsuccess = false;       handle hfile = createfile(pszfilename, generic_read, file_share_read, null, open_existing, 0, null);      if (hfile != invalid_handle_value)      {          dword dwfilesize = getfilesize(hfile, null);          if (dwfilesize != invalid_file_size)         {              lptstr pszfiletext = (lptstr) localalloc(lmem_fixed, ((dwfilesize * 3) + 1) * sizeof(tchar));              if (pszfiletext != null)             {                 byte buffer[1024];                 dword dwoffset = 0;                 dword dwread;                   (dword dwfilepos = 0; dwfilepos < dwfilesize; dwfilepos += dwread)                 {                     if (!readfile(hfile, buffer, sizeof(buffer), &dwread, null))                      {                         closehandle(hfile);                         return false;                     }                      if (dwread == 0)                         break;                      (dword idx = 0; idx < dwread; ++idx)                     {                         pszfiletext[dwoffset++] = hex[(buffer[idx] & 0xf0) >> 4];                         pszfiletext[dwoffset++] = hex[buffer[idx] & 0x0f];                         pszfiletext[dwoffset++] = text(' ');                     }                 }                  pszfiletext[dwoffset] = 0; // add null terminator                   bsuccess = setwindowtext(hedit, pszfiletext);                 localfree(pszfiletext);             }          }           closehandle(hfile);      }       return bsuccess;  }

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