Reading PPM format images

[Haveq]

Hey 2kaud,

I just have a few questions to your code above.

What exactly is happening in this part?

unsigned int read = 0;

if ((read = fread(pixels, 1, size, fr)) != size) {...}

return pixels;


1. What do you store in read and why do you need it?

2. And what are you doing with pixels?
For me it looks like the data/content of the picture is in pixels?

I am confused because you store width, height, maximum(rgb?) and this 3 are also the only output of printf.
Nothing happens with the data/content.
Is it also possible to store the data outside the function?

Just for me to understand.
This Part is to read and store the header

fscanf(fr, "%9s", header);
	if (strcmp(header, p6))
		printf("Incorrect header %s found\n", header);
	else
		if (fscanf(fr, "%d %d\n%d\n", width, height, maximum) != 3)
			puts("Invalid header values");
		else {
			const unsigned int size = *width * *height * 3;

and this part is for the data/content

			if ((pixels = malloc(size)) == NULL)
				puts("Error allocating memory");
			else {
				unsigned int read = 0;

				if ((read = fread(pixels, 1, size, fr)) != size) {
					printf("Error reading binary data. Wanted %i, got %i\n", size, read);
					free(pixels);
					pixels = NULL;
				}
			}
		}

	fclose(fr);
	return pixels;

But i dont see/understand what you are doing with pixels?

It's an old post and if you read this and help me understand i owe you more than one beer.

Thank you and br