bitmapinfoheader

[shankle]

Could someone translate the "C" version of a 64-bit BitMapInfoHeader into masm
please. I have looked but can find nothing but a "C" version.
I don't do "C"

[Vortex]

Hi shankle,

Code Select Expand

BITMAPINFOHEADER STRUCT

  biSize            DWORD      ?
  biWidth           DWORD      ?
  biHeight          DWORD      ?
  biPlanes          WORD       ?
  biBitCount        WORD       ?
  biCompression     DWORD      ?
  biSizeImage       DWORD      ?
  biXPelsPerMeter   DWORD      ?
  biYPelsPerMeter   DWORD      ?
  biClrUsed         DWORD      ?
  biClrImportant    DWORD      ?

BITMAPINFOHEADER ENDS


Here, you can find an example.

[shankle]

Thank you Vortex for replying.
So biwidth, biheight, bixpelspermeter & biypelspermeter are not 64-bits long.
I thought they were. And I guess DD will work in a 64-bit system?

[Vortex]

Hello shankle,

You are right. Looking at the original C declaration of the structure :

Code Select Expand

typedef struct tagBITMAPINFOHEADER {
  DWORD biSize;
  LONG  biWidth;
  LONG  biHeight;
  WORD  biPlanes;
  WORD  biBitCount;
  DWORD biCompression;
  DWORD biSizeImage;
  LONG  biXPelsPerMeter;
  LONG  biYPelsPerMeter;
  DWORD biClrUsed;
  DWORD biClrImportant;
} BITMAPINFOHEADER, *PBITMAPINFOHEADER;

Building the code below as 64-bit :

Code Select Expand

#include <stdio.h>
#include <windows.h>

int main()
{
BITMAPINFOHEADER *bi;
printf("sizeof(BITMAPINFOHEADER->biWidth)=%u\n",sizeof(bi->biWidth));
return 0;
}


Code Select Expand

sizeof(BITMAPINFOHEADER->biWidth)=4

[jj2007]

Many structures are identical for 32- and 64-bit code. The exceptions concern mostly pointers and handles.

[aw27]

This means that the same bmp file works without change in either 32 or 64 bit. Thanks God.