The order of the ' void *inData ' in filter plug-in

We want to get the image data in filter plug-in.
the code is like this:
-------------------------------------------
FILE *fp;
fp=fopen("C:\\h.bmp","w+r");
fseek(fp, 55, SEEK_SET);
fwrite((unsigned char*)gStuff->inData, 1, gStuff->bigDocumentData->
wholeSize32.v * gStuff->bigDocumentData->wholeSize32.h *
gStuff->planes, fp);
fclose(fp);

-------------------------------------------
Why the image data saved is disordered?

>fp=fopen("C:\\h.bmp","w+r");
>Why the image data saved is disordered?

It's not. But BMP files have different rules and orders for pixel data
than the Photoshop data. Read the specification for both carefully,
you will need to convert each pixel and ALSO may need to do special
processing at the end of each scan line.

Thank Aandi Inston.

>Could you tell me how to convert each pixel data to BMP files?

It should be obvious once you have studied both specifications. You
seem to be making assumptions that pixel data is universal, rather
than specific to each file format.

Note that some sources on the web incorrectly state that the byte
order in a 24-bit BMP file is Red, Green, Blue; in fact it is Blue,
Green, Red.  This file seems accurate:
http://atlc.sourceforge.net/bmp.html