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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

How to store a BMP file to nios board from a PC

Hi

I am using the Apex20kE device

I got a problem to load a bmp file to the Nios development board.

Here is my code

# include <stdio.h># include <nios.h>

# define K 12960

main(void)

{

FILE *fp;

char p[K];

int i;

fp=fopen("d:\\picture.bmp","rb" ) ;

if (fp==NULL)

{ printf("Can not open file.\n");

exit(1);

}

fgets(p,K,fp);

fclose(fp);

for(i=0;i<K;i++)

printf("%8x,",p[i]);

return 0;

}

Well ,it doest work

I don&#39;t want to write the image pixel by pixel

Is there anyone who can help me?

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    I&#39;m assuming K is the size of the file you want to read so you could try:

    fread(p, 1, K, fp);

    which reads K "items" of size 1 byte.

    fread returns the number of items read so you can test whether it worked like this:

    numRead =fread(p,1,K,fp);

    if (numRead != K)

    printf("read only %d of %d\n", numRead, K);

    The reason you cannot use fgets is that that function stops when it encounters a newline in the data.

    By the way, you can look at the Windows structures BITMAPFILEHEADER and BITMAPINFO to find a way of properly parsing out a bitmap.

    Andrew
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    19 years ago

    I am not clear about " Apex20kE" device.

    but your program has no Filesystem support.may that be the reason? thanks